Liebert® PDX™ and Liebert PCW™ Thermal Management Systems
System Design Manual–17-29kW, 5-8 Tons, Upflow and Downflow, 60Hz
TABLE OF CONTENTS
LIEBERT PDX AND LIEBERT PCW NOMENCLATURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
1.0
LIEBERT PDX AND LIEBERT PCW CONFIGURATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
1.1
Cooling configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2
Blower configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.0
LIEBERT PDX/PCW CAPACITY DATA—60HZ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
3.0
DIMENSIONAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.1
Floor Stand Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.2
Plenum Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.0
HEAT REJECTION—LIEBERT MC™ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
5.0
HEAT REJECTION—DRYCOOLERS AND PUMPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.1
Pump Packages and Expansion Tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
6.0
ELECTRICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
6.1
Electrical Field Connections—Liebert MC™. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
6.2
Standard Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
6.3
Electrical Data—Liebert MC™ Condensers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
6.3.1
Wye- vs. Delta-Connected Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
6.4
Standard Electrical Connections, Liebert MC, Premium Efficiency Control . . . . . . . . . . . . 41
6.5
Electrical Data—Drycoolers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
7.0
PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
8.0
GUIDE SPECIFICATIONS—NOMINAL 17, 18, 23 OR 29KW THERMAL MANAGEMENT
SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
1.0
2.0
3.0
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
PRODUCT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
EXECUTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
i
ii
Liebert PDX and Liebert PCW Nomenclature
LIEBERT PDX AND LIEBERT PCW NOMENCLATURE
Model Number – Part 1/2
Model Details
Part 2/2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
P
X
0
2
9
U
A
1
A
D
H
E
2
8
0
1
P
L
5
F
P
A
1
2
3
Digit 1, 2 = Product Family
PX = Liebert PDX (DX)
PW = Liebert PCW (CW)
Digit 3, 4, 5 = Cooling Capacity, kW
Nominal Sensible Capacity, kW
Digit 6 = Air Discharge
U = Upflow with front air return
C = Upflow with bottom air return
D = Downflow - discharge into raised floor
H = Downflow with front air discharge
1 = Downflow with front and right side discharge
2 = Downflow with front and right and left side discharge
3 = Downflow with front and left side discharge
Digit 7 = System Type
A = Air-Cooled
W = Water/Glycol-Cooled
G = GLYCOOL
C = Chilled Water
D = Dual Cool (Air-Cooled + FC Coil - 3-Way FC Valve)
H = Dual Cool (Water/Glycol-Cooled + FC Coil - 3-Way FC Valve)
2 = Dual Cool (Air-Cooled + FC Coil - 2Way FC Valve)
3 = Dual Cool (Water/Glycol-Cooled + FC Coil - 2-Way FC Valve)
Digit 8 = Airflow (fan type)
1 = EC plug fans
Digit 9 = Power Supply
A = 460V / 3ph / 60Hz
B = 575V / 3ph / 60Hz
C = 208V / 3ph / 60Hz
D = 230V / 3ph / 60Hz
2 = 380 / 3ph / 60Hz
Digit 10 = Cooling System
S = Standard Scroll w/TXV (no sound jacket)
D = Digital Scroll w/TXV (no sound jacket)
P = Digital Scroll w/EEV (no sound jacket) 3
8 - Digital Scroll with TXV & Sound Jacket
9 - Digital Scroll with EEV & Sound Jacket 3
2 = Chilled Water - 2-Way Standard Pressure
3 = Chilled Water - 3-Way Standard Pressure
1 = Chilled Water - 2-Way High Pressure
T = Chilled Water - 3-Way High Pressure
Digit 11 = Humidification
0 = No humidifier
H = Infrared Humidifier
S = Steam Gen Canister Humidifier
Digit 12 = Display
E = Large Display w/ Supply Air Sensor
Digit 13 = Reheat
0 = No reheat
2 = Electric reheat (Two-Stage)
4 = Hot Water Reheat (CW only)
Digit 14 = Air filter
8 = MERV 8, 2" (with Clogged Filter Sensor)
9 = MERV 11, 2" (with Clogged Filter Sensor)
Digit 15 Coil, Valve & Pressure Options
0 = Air-Cooled, no valve
1 = Standard Pressure, 2 Way MBV (condenser valve)
2 = High Pressure, 2 Way MBV (condenser valve) 1
7 = Standard Pressure, 3 Way MBV (condenser valve)
8 = High Pressure, 3 Way MBV (condenser valve) 1
B = Standard Pressure, Dual Cool (Air-cooled)
E = High Pressure, Dual Cool (Air-Cooled)
Digit 16 = Enclosure options
1 = No options
C = Double-skin panels
3 = IBC/OSHPD bracing 2
8 = Double skin panels and IBC/OSHPD 2
Digit 17 = High-Voltage Options
M = Locking Disconnect (65kA) No condensate pump
P = Locking Disconnect (65kA) with condensate pump
Digit 18 = Low-Voltage Option Packages
0 = None
L = Terminal Package
H = Reheat & Humidifier Lockout
R = Remote Humidity Contact
C = Term. Pkg. and R/H lockout
D = Term. Pkg. and remote humidifier contact
E = Term. Pkg. and R/H lockout and remote humidifier contact
F = Remote humidifier contact plus R/H lockout
Digit 19 = Monitoring Cards
0 = No Cards
U = One Liebert IntelliSlot™ IS-UNITY-DP Card
C = One Liebert IntelliSlot IS-485EXI
6 = One IS-Unity-DP and IS-485EXI
7 = Two Liebert IntelliSlot™ IS-UNITY-DP Cards
Digit 20 = Sensors
0 = None
S = Smoke Sensor
H = High-Temperature Sensor
F = Smoke and High-Temperature Sensors
C = Compressor Overload Sensor
A = Smoke and Compressor Overload Sensors
D = High-Temperature Compressor Overload Sensors
K = Smoke, High-Temperature Compressor Sensors
Digit 21 = Packaging
P = Domestic
C = Wood Crate Export
Digit 22 = Configuration code
A = No SFA’s (An Alpha except S)
S = SFA
Digit 23-25 = Factory Configuration Number
Note: The 14-digit model number consists of the first 10 digits and last
four digits of the configuration number.
1.
2.
3.
1
High-pressure MBV also results in high pressure FC valve.
Consult Factory for IBC/OSPHD option availability.
Consult Factory for EEV option availability
Liebert® PDX™ and Liebert PCW™
Liebert PDX and Liebert PCW Configurations
1.0
LIEBERT PDX AND LIEBERT PCW CONFIGURATIONS
1.1
COOLING CONFIGURATIONS
AIR-COOLED
Air-cooled unit piping is
spun closed from the factory
and contains a nitrogen
holding charge. Each
installation requires fieldsupplied refrigerant and
piping to a condenser.
GLYCOL-COOLED
Glycol-cooled units are factory-charged and tested.
Field-supplied and field-installed piping is required
from the unit to the drycooler and pump package.
GLYCOOL-INTEGRATED FLUID ECONOMIZER
GLYCOOL units are factory-charged and tested. Field-supplied
and field-installed piping is required from the unit to the
drycooler and pump package. An additional Liebert Economizer
coil is included for use when fluid temperatures are sufficiently
low (below room temperature). Economizer cooling is provided
by circulating cold glycol through this second coil, reducing or
eliminating compressor operation.
WATER-COOLED
Water-cooled units are factory-charged and
tested. Field-supplied and field-installed
water piping is required from the unit to the
cooling tower.
DUAL-COOL
This system has all of the features of a compressorized
system, but adds a second cooling coil that is connected
to a source of chilled water. Cooling is provided by
circulating chilled water, when available, through this
second coil and reducing compressor operation.
Liebert® PDX™ and Liebert PCW™
2
Liebert PDX and Liebert PCW Configurations
1.2
Blower configurations
Figure 1
Downflow, discharge into raised floor
Return Air
Filter
Front
Coil
Blower
Raised
Floor
Floor
Stand
(optional)
Supply
Air
Bottom Supply
3
Liebert® PDX™ and Liebert PCW™
Liebert PDX and Liebert PCW Configurations
Figure 2
Downflow, front air discharge models
Return Air
Filter
Front
Coil
Supply
Air
Blower
Floor
Front Supply
Applicable to Installations
Without Raised Floors
Figure 3
Upflow, front return models
Supply Air
Top Supply
Blower
Front
Coil
Filter
Return
Air
Liebert® PDX™ and Liebert PCW™
4
Liebert PDX and Liebert PCW Configurations
Figure 4
Upflow, bottom rear return, with rear return floor stand
Supply Air
Top Supply
Blower
Front
Coil
Return
Air
Filter
5
Liebert® PDX™ and Liebert PCW™
Liebert PDX/PCW Capacity Data—60Hz
2.0
LIEBERT PDX/PCW CAPACITY DATA—60HZ
Table 1
Liebert PDX air-cooled capacity data
Model Size
PX018
PX023
PX029
Net Capacity, kW (BTUH), Standard Air Volume and Evaporator Fan Motor, Standard and Digital Compressors
85 °F DB, 65 °F WB (33% RH), 120°F SCT
Total, kW (kBTUH)
20.5 (69.9)
26.2 (89.4)
33.0 (112.6)
Sensible, kW (kBTUH)
20.5 (69.9)
26.2 (89.4)
32.9 (112.3)
Total, kW (kBTUH)
17.7 (60.4)
22.9 (78.1)
28.9 (98.7)
Sensible, kW (kBTUH)
17.7 (60.4)
22.5 (76.8)
28.6 (97.6)
Standard Airflow, CFM (m3h) 1
2800 (4760)
3500 (5950)
4300 (7310)
75 °F DB, 61 °F WB (45% RH), 120°F SCT
Fan Data
Standard Fan Motor, kW (hp)
3.1 (4.2)
Standard Fan Motor with Dual Cool, kW (hp)
3.1 (4.2)
External Static Pressure, in. WG (Pa)
3.6 (4.8)
0.2 (50)
Evaporator Coil
Face Area, ft2 (m2), Without GLYCOOL or Dual Cool
9.9 (0.92)
DX Coil Rows
Face Velocity Without Econ-O-Coil, FPM (m/s)
3
283 (1.4)
4
354 (1.8)
Face Area, ft2 (m2), With GLYCOOL or Dual Cool
9.4 (0.87)
GLYCOOL or Dual Cool Rows
Face Velocity With Econ-O-Coil, FPM (m/s)
434 (2.2)
4
298 (1.5)
372 (1.9)
457 (2.3)
13.6 (46.4)
13.9 (47.5)
15.1 (51.6)
Electric Reheat (Two-Stage)
Capacity, kW (BTUH), Including Motor Heat
Infrared Humidifier
Capacity, lb/hr (kg/hr)
7.7 (3.5)
Capacity, lb/hr (kg/hr)
10.8 (4.9)
Steam Generating Humidifier
Condensate Pump - Dual Float Type
Capacity, ft WG @ 5gpm (18.9 l/m)
45@208V, 48@230V, 40@460V
Filter Section - MERV rating per ASHRAE 52.2 - 2007 - Deep Pleated Disposable Type
Standard 2" (51mm) Filter Rating
MERV 8 Pleated Filter
Optional 2" (51mm) Filter Rating
MERV11 Pleated Filter
Quantity
Nominal Size, in. (mm)
1
1
1
29.5 x 28.5 (749 x 724)
Effective Surface Area, ft2 (m2)
5.8 (0.54)
Piping Connection Sizes
Hot Gas Line, in.
Liebert® PDX™ and Liebert PCW™
5/8
7/8
Liquid Line, in.
5/8
Humidifier Supply Line, in.
1/4
Condensate Drain Line, in.
3/4
6
Liebert PDX/PCW Capacity Data—60Hz
Table 1
Liebert PDX air-cooled capacity data (continued)
Model Size
PX018
PX023
PX029
MCS028
MCM040
MCL055
1
1
1
Outdoor Air-Cooled Condenser, Standard 95°F (35°F) Ambient Selection
Condenser Match-Up, Air-Cooled 95°F (35°C) Ambient and 85°F Return Air
Model (R-410A) Refrigerant
Number of Fans
Hot Gas Line, in.
7/8
1-1/8
Liquid Line, in.
5/8
7/8
Dual-Cool Unit Capacity Using Econ-O-Coil, (Four-Pipe System) with Water in Econ-O-Coil Circuit)
85°F DB, 65°F WB (33% RH), 45°F EWT, 55 °F LWT
Total, kW (kBTUH)
28.9 (98.7)
32.3 (110.3)
37.0 (126.4)
Sensible, kW (kBTUH)
27.5 (93.9)
30.6 (104.8)
35.2 (120.2)
Flow Rate, GPM (l/m)
21.6 (81.6)
21.6 (81.6)
28.7 (108.6)
Unit Pressure Drop, ft. of water (kPa)
16.1 (48.1)
23.8 (70.9)
32.3 (96.5)
75°F DB, 61°F WB (45% RH), 45°F EWT, 55°F LWT
Total, kW (kBTUH)
17.7 (60.4)
22.1 (75.5)
24.8 (84.7)
Sensible, kW (kBTUH)
16.8 (57.4)
21.0 (71.7)
23.6 (80.6)
Flow Rate, GPM (l/m)
19.7 (74.4)
19.5 (73.8)
22.0 (83.4)
Unit Pressure Drop, ft. of water (kPa)
16.1 (48.1)
23.8 (70.9)
32.3 (96.5)
Fluid Volumes and Piping Connection Sizes
Econ-O-Coil, gal (L)
2.3 (8.6)
Econ-O-Coil Water Supply and Return, in. OD Copper
2.7 (10.1)
1-1/8
Unit Weights
Air-Cooled, Dry Weight, lb (kg)
670 (304)
700 (317)
Air Cooled with Dual Cool, Dry Weight, lb (kg)
750 (340)
790 (358)
1. Airflow data rated with 2" MERV 8 filter, rated per ASHRAE 52.2-2007.
2. The net capacity data has fan motor heat factored in for all ratings.
3. Capacity data is factory-certified to be within 5% tolerance.
7
Liebert® PDX™ and Liebert PCW™
Liebert PDX/PCW Capacity Data—60Hz
Table 2
Liebert PDX water-cooled data
Model Size
PX018
PX023
PX029
Net Capacity, kW (BTUH), Standard Air Volume and Evaporator Fan Motor, Standard and Digital Compressors
85 °F DB, 65 °F WB (33% RH), 105°F SCT
Total kW (kBTUH)
21.8 (74.4)
27.7 (94.5)
35 (119.5)
Sensible kW (kBTUH)
21.8 (74.4)
27.7 (94.5)
35 (119.5)
Total, kW (kBTUH)
19.3 (65.9)
25.1 (85.6)
31.3 (106.9)
Sensible kW (kBTUH)
18.0 (61.4)
23.4 (79.8)
29.9 (102.0)
Standard Airflow, CFM (m3h) 1
2800 (4760)
3500 (5950)
4300 (7310)
75 °F DB, 61 °F WB (45% RH), 105°F SCT
Fan Data
Standard Fan Motor, kW (hp)
3.1 (4.2)
Standard Fan Motor with Dual Cool, kW (hp)
3.1 (4.2)
External Static Pressure, in. WG (Pa)
3.6 (4.8)
0.2 (50)
Evaporator Coil
Face Area, ft2 (m2), Without GLYCOOL or Dual Cool
9.9 (0.92)
DX Coil Rows
Face Velocity Without Econ-O-Coil, FPM (m/s)
3
4
283 (1.4)
354 (1.8)
Face Area, ft2 (m2), With GLYCOOL or Dual Cool
9.4 (0.87)
GLYCOOL or Dual Cool Rows
Face Velocity With Econ-O-Coil, FPM (m/s)
434 (2.2)
4
298 (1.5)
372 (1.9)
457 (2.3)
14.4 (49.2)
14.9 (50.9)
15.1 (51.6)
Electric Reheat (Two-Stage)
Capacity, kW (BTUH) Including Motor Heat
Infrared Humidifier
Capacity, lb/hr (kg/hr)
7.7 (3.5)
Capacity, lb/hr (kg/hr)
10.8 (4.9)
Steam Generating Humidifier
Condensate Pump - Dual Float Type
Capacity - ft WG @ 5gpm (18.9 L/m)
45 @ 208V, 48 @ 230V, 40 @ 460V
Filter Section - MERV Rating per ASHRAE 52.2 - 2007 - Deep Pleated Disposable Type
Standard 2" (51mm) Filter Rating
MERV 8 Pleated Filter
Optional 2" (51mm) Filter Rating
Quantity
MERV11 Pleated Filter
1
Nominal Size, in. (mm)
1
29.5 x 28.5 (749 x 724)
Effective Surface Area, ft (m )
2
1
5.8 (0.54)
2
Water Valve
Water Valve Type
Water Valve Nominal Size, in.
MBV
1
1
1
103.6 (30.3)
109.4 (32.0)
147.9 (43.3)
18.4 (69.7)
20.6 (78.0)
29.2 (110.5)
3.1
3.9
14.6
Water Requirements, Brazed Plate Condenser
THR, kW (BTUH) @ 85°F(29°C), 33%RH
104°F (29.4°C) EWT - 130°F (43.3°C) Condensing Temperature
Flow Rate, GPM (L/m)
Unit Pressure Drop, ft. of water (kPa)
Piping Connection Sizes
Condenser Water Supply and Return, in. OD Copper
Liebert® PDX™ and Liebert PCW™
1-1/8
Humidifier Supply Line, in.
1/4
Condensate Drain Line, in.
3/4
8
Liebert PDX/PCW Capacity Data—60Hz
Table 2
Liebert PDX water-cooled data (continued)
Model Size
PX018
PX023
PX029
Unit Fluid Volumes
Water-Cooled Unit, gal (L)
1.7 (6.4)
1.9 (7.0)
Dual-Cool Unit Capacity Using Econ-O-Coil, (Four-Pipe System) with Water in Econ-O-Coil Circuit)
85°F DB, 65°F WB (33% RH), 45°F EWT, 55°F LWT
Total kW (kBTUH)
28.9 (98.7)
32.3 (110.3)
37.0 (126.4)
Sensible kW (kBTUH)
27.5 (93.9)
30.6 (104.8)
35.2 (120.2)
Flow Rate, GPM (L/m)
Unit Pressure Drop, ft. of water (kPa)
21.6 (81.6)
28.7 (108.6)
16.1 (48.1)
23.8 (70.9)
32.3 (96.5)
Total kW (kBTUH)
17.7 (60.4)
22.1 (75.5)
24.8 (84.7)
Sensible kW (kBTUH)
16.8 (57.4)
21.0 (71.7)
23.6 (80.6)
Flow Rate, GPM (l/m)
19.7 (74.4)
19.5 (73.8)
22.0 (83.4)
Unit Pressure Drop, ft. of water (kPa)
16.1 (48.1)
23.8 (70.9)
32.3 (96.5)
75°F DB, 61°F WB (45% RH), 45 °F EWT, 55°F LWT
Fluid Volumes & Piping Connection Sizes
Econ-O-Coil, gal (L)
2.3 (8.6)
Econ-O-Coil Water Supply and Return, in. OD Copper
2.7 (10.1)
1-1/8
Unit Weights
Water Cooled, Dry Weight, lb (kg)
690 (313)
720 (327)
Water Cooled with Dual Cool, Dry Weight, lb (kg)
770 (349)
810 (367)
1. Airflow data rated with 2" MERV 8 filter, rated per ASHRAE 52.2-2007.
2. The net capacity data has fan motor heat factored in for all ratings.
3. Capacity data is factory-certified to be within 5% tolerance.
9
Liebert® PDX™ and Liebert PCW™
Liebert PDX/PCW Capacity Data—60Hz
Table 3
Liebert PDX glycol-cooled data
Model Size
PX018
PX023
PX029
Net Capacity, kW (BTUH), Standard Air Volume and Evaporator Fan Motor, Standard and Digital Compressors
85°F DB, 65°F WB (33% RH), 130°F SCT
Total kW (kBTUH)
19.4 (66.2)
23.5 (80.2)
31.4 (107.2)
Sensible kW (kBTUH)
19.4 (66.2)
23.5 (80.2)
31.4 (107.2)
Total kW (kBTUH)
16.7 (57.0)
20.3 (69.3)
27.2 (92.9)
Sensible kW (kBTUH)
16.7 (57.0)
20.3 (69.3)
27.2 (92.9)
Standard Airflow, CFM (m3h) 1
2800 (4760)
3500 (5950)
4300 (7310)
75 °F DB, 61 °F WB (45% RH), 130°F SCT
Fan Data
Standard Fan Motor, kW (hp)
3.1 (4.2)
Standard Fan Motor with Dual Cool, kW (hp)
3.1 (4.2)
3.6 (4.8)
External Static Pressure, in. WG (Pa)
0.2 (50)
Evaporator Coil
Face Area, ft2 (m2), Without GLYCOOL or Dual Cool
9.9 (0.92)
DX Coil Rows
Face Velocity Without Econ-O-Coil, FPM (m/s)
3
283 (1.4)
Face Area, ft2 (m2), With GLYCOOL or Dual Cool
4
354 (1.8)
GLYCOOL or Dual Cool Rows
Face Velocity With Econ-O-Coil, FPM (m/s)
434 (2.2)
9.4 (0.87)
4
298 (1.5)
372 (1.9)
457 (2.3)
14.4 (49.2)
14.9 (50.9)
15.1 (51.6)
Electric Reheat (Two-Stage)
Capacity, kW (BTUH) Including Motor Heat
Infrared Humidifier
Capacity, lb/hr (kg/hr)
7.7 (3.5)
Capacity, lb/hr (kg/hr)
10.8 (4.9)
Steam Generating Humidifier
Condensate Pump - Dual Float Type
Capacity, ft WG @ 5gpm (18.9 l/m)
45@208V, 48@230V, 40@460V
Filter Section - MERV rating per ASHRAE 52.2 - 2007 - Deep Pleated Disposable Type
Standard 2" (51mm) Filter Rating
MERV 8 Pleated Filter
Optional 2" (51mm) Filter Rating
Quantity
MERV11 Pleated Filter
1
Nominal Size, in. (mm)
1
1
29.5 x 28.5 (749 x 724)
Effective Surface Area, ft2 (m2)
5.8 (0.54)
Water Valve
Water Valve Type
Water Valve Nominal Size, in.
MBV
1
1
1
103.6 (30.3)
109.4 (32.0)
147.9 (43.3)
18.4 (69.7)
20.6 (78.0)
29.2 (110.5)
3.1 (9.3)
3.9 (11.7)
14.6 (43.6)
40% PG Fluid Requirements, Brazed Plate Condenser
THR, kBTUH (kW)@ 85°F(29°C), 33% RH
104°F (29.4°C)EWT - 130°F (43.3°C)Condensing Temperature
Flow Rate, GPM (L/m)
Unit Pressure Drop, ft. of water (kPa)
Piping Connection Sizes
Condenser Glycol Supply and Return, in. OD Copper
Liebert® PDX™ and Liebert PCW™
1-1/8
Humidifier Supply Line, in.
1/4
Condensate Drain Line, in.
3/4
10
Liebert PDX/PCW Capacity Data—60Hz
Table 3
Liebert PDX glycol-cooled data (continued)
Model Size
PX018
PX023
PX029
Unit Fluid Volumes
Glycol-Cooled Unit, gal (L)
1.7 (6.4)
1.9 (7.0)
174-16
225-26
Drycooler Match-Up 95°F (35°C) Ambient 40% EG
Base Model Size-Circuits
Drycooler Connections, in. OD Cu
Volume, gal (L)
2-1/8
6.9 (26.2)
6.9 (26.2)
11.1 (42.1)
Fan, hp (kW)
2x 3/4 (0.5)
2x 3/4 (0.5)
2x 3/4 (0.5)
Pressure Drop, ft. water (kPa)
4.3 (12.85)
5.3 (15.84)
Glycol Pump, hp (kW) for 40 ft. of Piping Water Head
3/4 (0.5) 1-phase
Expansion Tank Capacity, gal (L)
4.3 (12.85)
3/4 (0.5) 3-phase
8.8 (33.1)
Dual-Cool Unit Capacity Using Econ-O-Coil, (Four-Pipe System) with Water in Econ-O-Coil Circuit
85 °F DB, 65 °F WB (33% RH), 45 °F EWT
Total kW (kBTUH)
28.9 (98.7)
32.3 (110.3)
Sensible kW (kBTUH)
27.5 (93.9)
30.6 (104.8)
Flow Rate, GPM (l/m)
Unit Pressure Drop, ft. of water (kPa)
21.6 (81.6)
37.0 (126.4)
35.2 (120.2)
28.7 (108.6)
16.1 (48.1)
23.8 (70.9)
32.3 (96.5)
Total kW (kBTUH)
17.7 (60.4)
22.1 (75.5)
24.8 (84.7)
Sensible kW (kBTUH)
16.8 (57.4)
21.0 (71.7)
23.6 (80.6)
Flow Rate, GPM (l/m)
19.7 (74.4)
19.5 (73.8)
22.0 (83.4)
Unit Pressure Drop, ft. of water (kPa)
16.1 (48.1)
23.8 (70.9)
32.3 (96.5)
75 °F DB, 61 °F WB (45% RH), 45 °F EWT
Fluid Volumes & Piping Connection Sizes
Econ-O-Coil, gal (L)
2.3 (8.6)
Econ-O-Coil Water Supply and Return, OD Copper, in.
2.7 (10.1)
1-1/8
Unit Weights
Glycol-Cooled, Dry weight, lb (kg)
690 (313)
720 (327)
Glycol-Cooled with Dual Cool, Dry Weight, lb (kg)
770 (349)
810 (367)
1. Airflow data rated with 2" MERV 8 filter, rated per ASHRAE 52.2-2007.
2. The net capacity data has fan motor heat factored in for all ratings.
3. Capacity data is factory-certified to be within 5% tolerance.
11
Liebert® PDX™ and Liebert PCW™
Liebert PDX/PCW Capacity Data—60Hz
Table 4
Liebert PDX GLYCOOL data
Model Size
PX018
PX023
PX029
Net Capacity, kW (BTUH), Standard Air Volume and Evaporator Fan Motor, Standard and Digital Compressors
85 °F DB, 65 °F WB (33% RH), 130°F SCT
Total kW (kBTUH)
19.4 (66.2)
23.5 (80.2)
31.4 (107.2)
Sensible kW (kBTUH)
19.4 (66.2)
23.5 (80.2)
31.4 (107.2)
Total kW (kBTUH)
16.7 (57.0)
20.3 (69.3)
27.2 (92.9)
Sensible kW (kBTUH)
16.7 (57.0)
20.3 (69.3)
27.2 (92.9)
Standard Airflow, CFM (m3h) 1
2800 (4760)
3500 (5950)
4300 (7310)
75 °F DB, 61 °F WB (45% RH), 130°F SCT
Fan Data
Standard Fan Motor, kW (hp)
3.1 (4.2)
External Static Pressure, in. WG (Pa)
3.6 (4.8)
0.2 (50)
Evaporator Coil
Face Area, ft2 (m2), Without GLYCOOL or Dual cool
9.9 (0.92)
DX Coil Rows
Face Velocity Without Econ-O-Coil, FPM (m/s)
3
283 (1.4)
Face Area, ft2 (m2), With GLYCOOL or Dual cool
4
354 (1.8)
9.4 (0.87)
GLYCOOL or Dual Cool Rows
Face Velocity With Econ-O-Coil, FPM (m/s)
434 (2.2)
4
298 (1.5)
372 (1.9)
457 (2.3)
14.4 (49.2)
14.9 (50.9)
15.1 (51.6)
Electric Reheat (Two-Stage)
Capacity, kW (BTUH) Including Motor Heat
Infrared Humidifier
Capacity, lb/hr (kg/hr)
7.7 (3.5)
Capacity, lb/hr (kg/hr)
10.8 (4.9)
Steam Generating Humidifier
Condensate Pump - Dual Float Type
Capacity, ft WG @ 5gpm (18.9 l/m)
45 @ 208V, 48 @ 230V, 40 @ 460V
Filter Section - MERV Rating per ASHRAE 52.2 - 2007 - Deep Pleated Disposable Type
Standard 2" (51mm) Filter Rating
MERV 8 Pleated Filter
Optional 2" (51mm) Filter Rating
MERV11 Pleated Filter
Quantity
1
Nominal Size, in. (mm)
1
1
29.5 x 28.5 (749 x 724)
Effective Surface Area, ft2 (m2)
5.8 (0.54)
Water Valve
Water Valve Type
Water Valve Nominal Size, in.
MBV
1
1
1
103.6 (30.3)
109.4 (32.0)
147.9 (43.3)
18.4 (69.7)
20.6 (78.0)
29.2 (110.5)
3.1 (9.3)
3.9 (11.7)
14.6 (43.6)
40% PG Fluid Requirements, Brazed Plate Condenser
THR, kBTUH (kW) @ 85°F (29°C), 33% RH
104°F (29.4°C)EWT - 130°F (43.3°C) Condensing Temperature
Flow Rate, GPM (l/m)
Unit Pressure Drop, ft. of water (kPa)
Piping Connection Sizes
Unit Glycol Supply and Return, in. OD Copper
Liebert® PDX™ and Liebert PCW™
1-1/8
Humidifier Supply Line, in.
1/4
Condensate Drain Line, in.
3/4
12
Liebert PDX/PCW Capacity Data—60Hz
Table 4
Liebert PDX GLYCOOL data (continued)
Model Size
PX018
PX023
PX029
Fluid Volumes
GLYCOOL Unit, gal (L)
4.0 (15.0)
4.5 (17.1)
Drycooler Match-Up 95°F (35°C)Ambient 40% EG
Base Model Size-Circuits
174-16
225-26
Drycooler Connections, in. OD Cu
2-1/8
Volume, gal (L)
6.9 (26.2)
Fan, hp (kW)
2x 3/4 (0.5)
Pressure Drop, ft. water (kPa)
Glycol Pump hp (kW) for 40 ft. of Piping Water Head
11.1 (42.1)
4.3 (12.85)
5.3 (15.84)
4.3 (12.85)
3/4 (0.5) 1-phase
1.5 (1.1) 3-phase
3 (2.2) 3-phase
Expansion Tank Capacity, gal (L)
8.8 (33.1)
GLYCOOL Coil Net Capacity Using 40% EG (Two-Pipe System)
85°F DB, 65°F WB (33% RH), 35°F EWT, 45°F LWT
Total kW (kBTUH)
22.3 (76.2)
32.6 (111.3)
36 (122.9)
Sensible kW (kBTUH)
22.3 (76.2)
30.2 (103.1)
34.6 (118.2)
Flow Rate, GPM (L/m)
18.4 (69.7)
20.6 (78.0)
29.2 (110.5)
Unit Pressure Drop, ft. of water (kPa)
15.5 (46.3)
28.8 (86.1)
44.3 (132.4)
Total kW (kBTUH)
18.0 (61.5)
26.2 (89.5)
29.0 (99.0)
Sensible kW (kBTUH)
16.8 (57.4)
23.0 (78.5)
26.1 (89.1)
Flow Rate, GPM (l/m)
18.4 (69.7)
20.6 (78.0)
29.2 (110.5)
Unit Pressure Drop, ft. of water (kPa)
17.8 (53.2)
33.8 (101.0)
46.8 (139.9)
75°F DB, 61°F WB (45% RH), 35°F EWT, 45°F LWT
Unit Weights
GLYCOOL Dry Weight, lb (kg)
770 (349)
810 (367)
1. Airflow data rated with 2" MERV 8 filter, rated per ASHRAE 52.2-2007.
2. The net capacity data has fan motor heat factored in for all ratings.
3. Capacity data is factory-certified to be within 5% tolerance.
13
Liebert® PDX™ and Liebert PCW™
Liebert PDX/PCW Capacity Data—60Hz
Table 5
Liebert PCW chilled water data
Model Size
PW017
PW029
Net Capacity Data kW (BTUH), Standard Air Volume and Evaporator Fan Motor
85°F DB, 65°F WB (33% RH), 45°F EWT, 55°F (LWT)
Total kW (kBTUH)
20.7 (70.7)
36.7 (125.3)
Sensible kW (kBTUH)
19.7 (67.3)
34.9 (119.2)
Flow Rate, GPM (l/m)
17.9 (67.8)
32.1 (121.2)
Unit Pressure Drop, ft. of water (kPa)
12.9 (38.6)
39.3 (117.4)
75°F DB, 61°F WB (45% RH), 45°F EWT, 55°F (LWT)
Total kW (kBTUH)
14.2 (48.5)
25.6 (87.4)
Sensible kW (kBTUH)
13.5 (46.1)
24.32 (83.0)
Flow Rate, GPM (l/m)
12.7 (48)
22.7 (86.4)
10 (30)
25.2 (75)
3500 (5947)
4800 (8155)
Unit Pressure Drop, ft. of water (kPa)
Fan Data
Standard Airflow, CFM (m3h) 1
Standard Fan Motor, kW (hp)
3.1 (4.2)
External Static Pressure, in. WG (Pa)
0.2 (50)
Chilled Water Coil
Face Area, ft2 (m2)
Rows
Face Velocity, FPM (m/s)
9.7 (0.90)
2
4
360 (1.8)
495 (2.5)
13.2 (45.1)
14.9 (50.9)
12.1 (41.3)
41.3 (12.1)
Electric Reheat (Two-Stage)
Capacity, kW (BTUH) Including Motor Heat
Hot Water Reheat 180°F (82.2°C) E.W.T., 75°F (23.9°C) E.A.T
Capacity, kW (kBTUH) Including Motor Heat
Pressure Drop, Ft. of Water (kPa)
12.8 (38.3)
Maximum Face Area, ft2 (m2)
3.78 (0.351)
Coil Rows
1
1
Infrared Humidifier
Capacity, lb/hr (kg/hr)
7.7 (3.5)
Capacity, lb/hr (kg/hr)
10.8 (4.9)
Steam Generating Humidifier
Condensate Pump - Dual Float Type
Capacity, ft WG @ 5gpm (18.9 l/m)
45@208V, 48@230V, 40@460V
Filter Section - Std. 2" (51mm)MERV rating per ASHRAE 52.2 - 2007 - Deep Pleated Disposable Type
Standard 2" (51mm) Filter Rating
MERV 8 Pleated Filter
Optional 2" (51mm) Filter Rating
MERV11 Pleated Filter
Quantity
Nominal Size, in. (mm)
Effective Surface Area, ft2 (m2)
1
1
29.5 x 28.5 (749 x 724)
5.8 (0.54)
Piping Connection Sizes
Chilled Water Supply and Return Connections, OD Cu
1-1/8
Humidifier Supply Line, in.
1/4
Condensate Drain Line, in.
3/4
Optional HWRH Supply and Return Connections, in. OD Cu
5/8
Liebert® PDX™ and Liebert PCW™
14
Liebert PDX/PCW Capacity Data—60Hz
Table 5
Liebert PCW chilled water data (continued)
Model Size
PW017
PW029
2.3 (8.6)
2.7 (10.1)
Fluid Volumes
Chilled Water Unit, gal (L)
Optional Hot Water Reheat, gal (L)
0.05 (0.189)
Water Control Valve
Water Valve Type
Water Valve Nominal Size, in.
Water Valve Body
Cv
MBV
1
1
2-Way or 3-Way
30/9
Valve Close-Off Pressure, PSI (kPa)
200 (1379)
Chilled Water, Dry Weight, lb (kg)
600 (272)
Unit Weights
1. Airflow data rated with 2" MERV 8 filter, rated per ASHRAE 52.2-2007.
2. The net capacity data has fan motor heat factored in for all ratings.
3. Capacity data is factory-certified to be within 5% tolerance.
15
Liebert® PDX™ and Liebert PCW™
Dimensional Data
3.0
DIMENSIONAL DATA
Figure 5
Cabinet and floor planning dimensions—Downflow
33-1/8"
(842mm)
34-5/8"
(879mm)
TOP
1-1/2"
(38mm)
34"
(864mm)
77-9/16"
(1970mm)
34"
(864mm)
Shaded areas indicate
the recommended minimum
clearance for component access.
34-1/2"
(876mm)
FRONT
Table 6
Weights for downflow, Liebert PDX and Liebert PCW, lb. (kg)
Liebert PDX Model No.
PX018-023
PX029
Air Cooled
670 (304)
700 (317)
Air Cooled w/Dual Cool
750 (340)
790 (358)
Water/Glycol
690 (313)
720 (327)
GLYCOOL or Water/Glycol w/Dual Cool
770 (349)
810 (367)
Liebert PCW Model No.
PW017-029
Chilled Water
600 (272)
Source: DPN002936, Rev. 2
Liebert® PDX™ and Liebert PCW™
16
DPN002936
Rev. 2
Dimensional Data
Figure 6
Cabinet and floor planning dimensions—Front discharge, downflow
33-1/8"
(842mm)
34-5/8"
(879mm)
2
26-1/8"
(663mm)
5-1/2"
(139mm)
TOP
1-1/2"
(38mm)
34"
(864mm)
34"
(864mm)
RIGHT ISO VIEW
1
77-9/16"
(1970mm)
9"
(226mm)
26-1/8"
(663mm)
10 3/4" (273mm)
34"
(864mm)
26-9/16"
(674mm)
34-1/2"
(876mm)
FRONT
Table 7
34"
(864mm)
3
1
LEFT ISO VIEW
1
Shaded area indicates the recommended minimum clearance for component access.
2
Optional opening for units with right side discharge or right and left side discharge.
3
Optional opening for units with left side discharge or right and left side discharge
DPN002944
Rev. 0
Weights for downflow, Liebert PDX and Liebert PCW, lb. (kg)
Liebert PDX Model No.
PX018-023
PX029
Air-Cooled
670 (304)
700 (317)
Air-Cooled w/Dual Cool
750 (340)
790 (358)
Water/Glycol
690 (313)
720 (327)
GLYCOOL or Water/Glycol w/Dual Cool
770 (349)
810 (367)
Liebert PCW Model No.
PW017-029
Chilled Water
600 (272)
Source: DPN002944, Rev. 0
17
Liebert® PDX™ and Liebert PCW™
Dimensional Data
Figure 7
Cabinet and floor planning dimensions—Upflow
34-11/16"
(881mm)
32-15/16"
(836mm)
1-3/4"
(45mm)
Top View
34"
(864mm)
OFF
77-5/8"
(1971mm)
Shaded area indicates a
recommended minimum
clearance for component
access.
34-1/2"
(876mm)
Approximate weights, upflow models, lb. (kg)
Liebert PDX Model No.
PX018-023
PX029
Air-Cooled
670 (304)
700 (317)
Air-Cooled w/Dual Cool
750 (340)
790 (358)
Water/Glycol
690 (313)
720 (327)
GLYCOOL or Water/Glycol w/Dual Cool
770 (349)
810 (367)
Liebert PCW Model No.
PW017-029
Chilled Water
600 (272)
Source: DPN002937, Rev. 0
Liebert® PDX™ and Liebert PCW™
NOTE: Unit with front return
shown. Bottom return with
rear return floor stand also
available.
DPN002937
Rev. 0
Front View
Table 8
34"
(864mm)
18
Dimensional Data
3.1
Floor Stand Dimensions
Figure 8
Floor stand dimensions—Downflow and upflow floor stands
32-5/8"
(829mm)
30-11/16"
(779mm)
1"
typ
(25mm)
7/8"
(23mm)
3"
(76mm)
A*
DPN002970
Rev. 0
Table 9
Floor stand height—Downflow
A
Height, in. (mm)
6 (152)
9 (229)
12 (305)
15 (381)
18 (457)
21 (533)
24 (610)
* Leveling feet are provided with ± 1-1/2" (38mm) adjustment from nominal height A.
Source: DPN002970, Rev. 0
19
Liebert® PDX™ and Liebert PCW™
Dimensional Data
Figure 9
Floor stand dimensions—Upflow, rear return and upflow floor stands
1" (25mm)
Ductwork
Flange
31-5/8"
(804mm)
32-5/8" (829mm)
Removable
Panel for Filter
Access
Filter
24-1/8"
(613mm)
28-7/8" (734mm)
Duct Flange Opening
FRONT
3"
(76mm)
7/8"
(23mm)
12-1/2"
(318mm)
Duct Flange
Opening
Leveling feet are provided with ±1-1/2" (38mm)
adjustment from nominal height.
REAR
Liebert® PDX™ and Liebert PCW™
20
DPN002971
Rev. 1
Dimensional Data
3.2
Plenum Dimensions
Figure 10
Plenum dimensions—Upflow and downflow
Front Views - Check One
Rear Views - Check One
34-1/2"
(876mm)
31-3/4"
(807mm)
With Grille
With Grille
H
1-7/16"
(37mm)
Without Grille
Without Grille
77-5/8"
1971mm)
Left Side Views Check One
Right Side Views Check One
With Grille
With Grille
Side View
Unit With Plenum
Front View
Unit With Plenum
Without Grille
Without Grille
Notes
1. Typical unit orientation shown with grille plenum. Plenum with grille
is available only for 18" height plenum. Nominal grille size is
24" x 14" (609mm x 355mm).
2. All plenums are shipped flat and must be field-assembled.
DPN002981
3. Unit with front return shown. Bottom return with rear return
Rev. 1
floor stand also available.
Table 10
Upflow unit plenum dimensions
H
Height, in. (mm)
18" (457)
24" (609)
30" (762)
36" (914)
42" (1066)
48" (1219)
21
Liebert® PDX™ and Liebert PCW™
Heat Rejection—Liebert MC™
4.0
HEAT REJECTION—LIEBERT MC™
Table 11
Liebert MC Selection for Liebert PDX units
Outdoor Design Ambient Temperature, °F (°C)
Model #
95 (35)
100 (38)
105 (41)
110 (43)
115 (46)
120 (49)
Traditional Open Room (75°F/45RH Return Air Conditions)
PX018
MCS028
MCM040
MCM040
MCM040
MCL055
MCM080
PX023
MCM040
MCM040
MCM055
MCL055
MCM080
MCL110
PX029
MCL055
MCL055
MCL055
MCL055
MCM080
MCL165
High-Temperature Return (85°F/33RH Return Air Conditions)
PX018
MCS028
MCM040
MCM040
MCM040
MCL055
MCM080
PX023
MCM040
MCL040
MCL055
MCL055
MCM080
MCL110
PX029
MCL055
MCL055
MCL055
MCM055
MCM080
MCL165
Table 12
Condenser shipping weights, dimensions and volume, approximate
Domestic Packaging
Model #
# of
Fans
Packaged
Weight
lb (kg)
Dimensions
(LxWxH)
in. (cm)
MCS028
1
335 (152)
MCM040
1
MCL055
Export Packaging
Volume
ft3 (m3)
Packaged
Weight
lb (kg)
Dimensions
(LxWxH)
in. (cm)
76x36x63
(193x91x160)
100 (2.8)
455 (206)
77x37x64
(196x94x163)
106 (3.0)
410 (186)
76x36x63
(193x91x160)
100 (2.8)
535 (243)
77x37x64
(196x94x163)
106 (3.0)
1
525 (238)
76x36x63
(193x91x160)
100 (2.8)
645 (293)
77x37x64
(196x94x163)
106 (3.0)
MCM080
2
750 (340)
136x36x63
(345x91x160)
179 (5.0)
945 (429)
137x37x64
(348x94x163)
188 (5.3)
MCL110
2
910 (413)
136x36x63
(345x91x160)
179 (5.0)
1110 (503)
137x37x64
(348x94x163)
188 (5.3)
MCL165
3
1330 (603)
196x36x63
(498x91x160)
257 (7.3)
1600 (726)
197x37x64
(413x66x142)
270 (7.7)
Volume
ft3 (m3)
Weights are based on units with EC fans, units with AC fans may be slightly less.
Net and packaged weights will increase with factory options: legs taller than 18", coated coils and seismic options. Field-installed
receivers also add to net weights. Consult factory for additional information. See Table 13 for weight added by longer legs.
Table 13
Condenser net weight
Additional Weight by Condenser Model, lb. (kg)
MCS028
MCM040
Leg Height
In. (mm)
1
Circuit
1
Circuit
18 (457)
154 (70)
36 (914)
286 (130) 363 (165) 590 (268) 590 (268) 486 (220) 766 (347) 766 (347) 1136 (515)
48 (1219)
318 (144) 395 (179) 622 (282) 622 (282) 518 (235) 798 (362) 798 (362) 1184 (537)
60 (1524)
349 (158) 426 (193) 653 (296) 653 (296) 549 (249) 829 (376) 829 (376) 1230 (558)
Liebert Lee-Temp
Receiver
Coated Coil
MCM080
1
Circuit
2
Circuits
MCL055
1
Circuit
MCL110
1
Circuit
2
Circuits
231 (105) 441 (200) 441 (200) 344 (156) 602 (273) 602 (273)
MCL165
1
Circuit
891 (404)
55 (25)
55 (25)
100 (45)
110 (50)
60 (27)
115 (52)
120 (54)
175 (79)
4 (2)
5 (2)
10 (5)
10 (5)
8 (4)
16 (7)
16 (7)
24 (11)
Condenser + Liebert Lee-Temp + Coated Coil = Total Weight
Source: DPN003034, Rev. 0
Liebert® PDX™ and Liebert PCW™
22
Heat Rejection—Liebert MC™
Figure 11
Condenser planning dimensions—MCS028
58-7/8" (1495mm)
50-5/8"
(1287mm)
42-3/4"
(1085mm)
See table below for
dimensions A, B and C
Height to Top
of Fan Guard
Height to Top
B
C
of Fan Guard
C
A
5
(12 0-5/
87 8"
mm
)
B
A
44-1/8"
(1121mm)
42-1/2"
(1079mm)
ANCHOR PLAN
F
Electric Box End
42-3/4"
(1085mm)
58-7/8"
(1495mm)
See Figure 15
for typical
footprint
dimensions.
44-1/8"
(1121mm)
42-1/2"
Emerson recommends a
(1079mm)
clearance of 36" (915mm)
on each side for proper
15-1/4"
operation and component
(387mm)
access.
40-7/8"
*Cross-bracing required for legs longer than 18".
(1038mm)
Quantity varies depending on model and options.
35-7/8"
(910mm)
DPN002372
Rev. 4
Leg Height
A *, In. (mm)
B
In. (mm)
C
In. (mm)
18 (457)
36 (914)
48 (1219)
60 (1524)
31-5/8 (803)
49-5/8 (1260)
61-5/8 (1565)
73-5/8 (1870)
39-5/8 (1006
57-5/8 (1464)
69-5/8 (1768)
81-5/8 (2073)
DPN002373
Rev. 5
* 18" legs standard for all models. Cross-bracing is required for legs longer than 18" (457mm).
Number varies according to model and options.
See Tables 12 and 13 for weights, including added weight for legs of various lengths.
Source: DPN002372, Rev. 2; DPN002373, Rev. 3
23
Liebert® PDX™ and Liebert PCW™
Heat Rejection—Liebert MC™
Figure 12
Condenser planning dimensions—MCM040 and MCM080 with/without Liebert Lee-Temp™
Height to Top
of Fan Guard
Emerson recommends a clearance of
36" (915mm) on each side for proper
operation and component access.
H
G
See table below for
dimensions A, B, C,
D, E, F, G and H
B
A*
A
F
575V Transformer
Enclosure Option
Eyebolts for lifting
condenser provided
on four-fan models
C
15-1/4"
387mm
Height to Top
of Fan Guard
46"
(1168mm)
For dual
circuit only
H
G
15-1/4"
387mm
A*
A
B
F
C
See Figure 15 for typical
footprint dimensions.
46"
(1168mm)
ANCHOR PLAN
D
Leg supplied for
each Liebert
Lee-Temp kit on
2- & 4-fan models
Provided On
Four-Fan Models
46-5/16"
(1177mm)
Electric Box End
E
39-5/16"
(999mm)
44-3/8"
(1127mm)
DPN002172, Rev. 5
DPN002189, Rev. 6
Liebert
Model #
No.
Fans
A
In. (mm)
A* (575V)
In. (mm)
B
In. (mm)
C
In. (mm)
D
In. (mm)
E
In. (mm)
Leg Height
F * In (mm)
G
In. (mm)
H
In. (mm)
MCM040
1
57-3/16
(1453)
65-3/8
(1661)
—
48 (1219)
46-5/16
(1177)
—
18 (457)
31-5/8
(803)
39-5/8
(1006
MCM080
2
105-1/4
(2674)
113-7/16
(2882)
—
96-1/16
(2440)
94-7/16
(2398)
—
36 (914)
49-5/8
(1260)
57-5/8
(1464)
48 (1219)
61-5/8
(1565)
69-5/8
(1768)
60 (1524)
73-5/8
(1870)
81-5/8
(2073)
Source: DPN002172, Rev. 3; and DPN002189, Rev. 4.
* 18" legs standard for all models. Cross-bracing required for legs longer than 18". Number
varies according to model and options.
See Tables 12 and 13 for weights, including added weight for legs of various lengths.
Liebert® PDX™ and Liebert PCW™
24
Heat Rejection—Liebert MC™
Figure 13 Condenser planning dimensions—MCL055, MCL110 and MCL165
See table below for
dimensions A, B, C, D, E, F,
G and H
Height to Top
of Fan Guard
Eyebolts for lifting condenser
provided on 3- and 4-fan models
H
G
A*
A
B
See Figure 15 for typical
footprint dimensions.
F
Emerson recommends a clearance of
36" (915mm) on each side for proper
operation and component access.
C
*Cross bracing required for legs longer than 18" (457mm).
Number varies per model and options selected.
55-1/2"
(1409mm)
ANCHOR PLAN
E
D
Provided on
3- and 4-Fan Models
53-7/8"
(1368mm)
48-3/4"
(1239mm) DPN002416
Rev. 4
A
in.
(mm)
B
in. (mm)
C
in. (mm)
D
in. (mm)
E
in. (mm)
Leg Height
F * In. (mm)
G
In. (mm)
H
In. (mm)
68
(1727)
—
56
(1423)
54-3/8
(1381)
—
18 (457)
35-7/8
(911)
43-5/8
(1108)
2
124-1/8
(3152)
—
112-1/8
(2848)
110-1/2
(2806)
—
36 (914)
53-7/8
(1368)
61-5/8
(1565)
3
180-1/4
(4578)
73-7/16
(1866)
168-1/4
(4274)
110-1/2
(2806)
56-1/8
(1425)
48 (1219)
65-7/8
(1673)
73-5/8
(1870)
60 (1524)
77-7/8
(1978)
85-5/8
(2175)
Model #
# of
Fans
MCL055
1
MCL110
MCL165
*
18" legs standard for all models. Cross-bracing required for legs longer than 18"
(457mm). Number varies according to model and options.
See Tables 12 and 13 for weights, including added weight for legs of various lengths.
Source: DPN002416, Rev. 4
25
Liebert® PDX™ and Liebert PCW™
Heat Rejection—Liebert MC™
Figure 14 Cabinet and anchor dimensions—MCL055, MCL110 and MCL165 with Liebert Lee-Temp™
receiver
Emerson recommends a clearance of
36" (915mm) on each side for proper
operation and component access.
Height to Top
of Fan Guard
Eyebolts for lifting condenser
provided on three- and four-fan models
H
G
A*
B A
F
See table below for
dimensions A,A*, B,
C, D, E, F, G and H.
See Figure 15 for typical
footprint dimensions.
C
15-1/4"
(387mm)
55-1/2"
(1410mm)
For
Dual-Circuit
Only
15-1/4"
(387mm)
ANCHOR PLAN
Provided on
3- & 4- Fan
Models
One leg supplied
for each Liebert
Lee-Temp kit
on 2, 3 and 4
fan models
Electric Box End
D
E
48-3/4"
(1239mm)
53-7/8"
(1368mm)
DPN002415
Rev. 5
54-3/8"
(1381mm)
Model #
# of
Fans
A
in. (mm)
B
in. (mm)
C
in. (mm)
D
in. (mm)
E
in. (mm)
Leg Height
F*
In. (mm)
MCL055
1
68
(1727)
—
56
(1423)
54-3/8
(1381)
—
MCL110
2
124-1/8
(3152)
—
112-1/8
(2848)
110 1/
(2806)
MCL165
3
180-1/4
(4578)
73-7/16
(1866)
168-1/4
(4274)
11-1/2
(2806)
G
In. (mm)
H
In. (mm)
18 (457)
35-7/8
(911)
43-5/8
(1108
—
36 (914)
53-7/8
(1368)
61-5/8
(1565)
56 1/8
(1425
48 (1219)
65-7/8
(1673)
73-5/8
(1870)
60 (1524)
77-7/8
(1978)
85-5/8
(2175)
* 18" legs standard for all models. Cross-bracing required for legs longer than 18" (457mm).
Number varies according to model and options.
See Tables 12 and 13 for weights, including added weight for legs of various lengths.
Source: DPN002415, Rev. 3
Liebert® PDX™ and Liebert PCW™
26
Heat Rejection—Liebert MC™
Figure 15 Typical condenser footprint dimensions, all units
13/16" (21mm)
2-1/2"
(64mm)
3-5/8"
(93mm)
1-7/8" (48mm)
2-1/2" (64mm)
3-5/8"
(93mm)
1/2"x1"
(12.7mm x 25.4mm)
Obround
1-7/8" (48mm)
27
Liebert® PDX™ and Liebert PCW™
Heat Rejection—Drycoolers and Pumps
5.0
HEAT REJECTION—DRYCOOLERS AND PUMPS
Table 14
Drycooler weights and dimensions
Domestic Packaging
Model #
No. of
Fans
Net
Weight
lb. (kg)
Packaged
Weight
lb (kg)
*D**174
2
540 (245)
605 (275)
*D**197
2
580 (263)
645 (293)
*D**225
2
620 (281)
685 (311)
Table 15
Dimensions
LxWxH
in. (cm)
Export Packaging
Volume
ft3 (m3)
97 x 30 x 55
(246 x 76 x 140)
Packaged
Weight
lb (kg)
805 (365)
845 (384)
93 (2.6)
885 (402)
98 x 31 x 56
(249 x 79 x 142)
Volume
ft3 (m3)
98 (2.8)
Glycol-cooled drycooler match-ups
Outdoor Temperature
°F (°C)
# Fans
Models 2
Suggested
Pump hp 3
PX018
100 (38)
2
DSO174*8
1.5
PX023
105 (41)
2
DSO225*16
2
PX029
95 (35)
2
DSO197*16
2
PDX Model
Dimensions
LxWxH
in. (cm)
1. * = A (460V / 3ph / 60Hz) – or – Y (208/230V / 3ph / 60Hz) – or – B (575V / 3ph / 60Hz)
2. Match-ups sized for 40% propylene glycol.
3. Suggested pump selections provide at least 30 ft. H2O head pressure for piping losses.
Figure 16 Drycooler planning dimensional data—Two-fan units
43-9/16"
(1106mm)
91-1/2"
(2324mm)
37-7/8"
(962mm)
18"
(457mm)
84"
(2134mm)
82"
(2083 mm)
43-3/16"
(1097mm)
Emerson recommends a clearance of
36" (915mm) on each side for proper
operation and component access.
Two-Fan
Drycooler
See Figure 17 for typical
drycooler footprint dimensions.
Liebert® PDX™ and Liebert PCW™
28
41-3/16"
(1046mm)
Heat Rejection—Drycoolers and Pumps
Figure 17 Typical drycooler footprint—Dimensions
1”
(25.4mm)
1-3/4”
(44.5mm)
4-1/4”
(108mm)
2”
(50.8mm)
1-3/4”
(44.5mm)
9/16" (14mm)
Typical Diameter
4-1/4”
(108mm)
2”
(50.8mm)
29
Liebert® PDX™ and Liebert PCW™
Heat Rejection—Drycoolers and Pumps
5.1
Pump Packages and Expansion Tank
Figure 18 Single-pump package and mounting
17-1/4"
(438.2mm)
SINGLE PACKAGE 0.75 - 7.5 HP
2
1
3
19"
(482.6mm)
2-7/8"
(72.9mm)
15-7/8"
(403.2mm)
1-3/4"
(44.4mm)
6-3/8"
(161.9mm)
8-3/4"
(222.3mm)
12-1/4"
(311.1mm)
30"
(762mm)
17"
(431.8mm)
PUMP PACKAGE MOUNTING ANGLES
(Angles are inside, bottom
of pump package. View used for
mounting reference.)
1
3" (76.2mm) diameter pump suction
connection knockouts
2
3" (76.2mm) diameter pump discharge
connection knockouts
4
3 7/8" (22.2mm) diameter electrical knockouts
4
4 1/2" (12.7mm) diameter holes for mounting
3/4"
(19mm)
C
DPN000278
Rev. 0
A
B
Liebert® PDX™ and Liebert PCW™
30
Heat Rejection—Drycoolers and Pumps
Figure 19 Dual-pump package and mounting
DUAL PACKAGE 0.75 - 5 HP
2
32-1/4"
(819.2mm)
1
2
3
1
3
15-7/8"
(403.2mm)
4-1/8"
(104.8mm)
6-3/8"
(161.9mm) "
2-7/8"
(73mm)
8-3/4" (222.2mm)
19"
(482.6mm)
1-3/4"
(44.4mm)
12-1/4"
(311.1mm)
23-3/4"
(603.2mm)
27-1/4"
(692.1mm)
30"
(762mm)
1 3" (76.2mm) diameter pump suction
connection knockouts
2 3" (76.2mm) diameter pump discharge
32"
(812.8mm)
connection knockouts
3 7/8" (22.2mm) diameter electrical knockouts
5 5" (127mm) diameter pump discharge
DPN000328
Rev. 0
connection hole
6 5" (127mm) diameter pump suction
connection hole
31
Liebert® PDX™ and Liebert PCW™
Heat Rejection—Drycoolers and Pumps
Figure 20 Expansion tank
30-1/2" (774.7mm)
1/2" F.P.T.
Fitting
Ø 9"
(228.6mm)
2-3/4"
(69.9mm)
2-1/2"
(63.5mm)
1"
(25.4mm)
1-1/2"
(38.1mm)
6-13/16"
(173mm)
1/2" F.P.T.
Fitting
17-1/4"
(438.2mm)
7"
(177.8mm)
4"
(101.6mm)
1"
(25.4mm)
Ø 1/2" (12.7mm)
8 Holes
8.8 gal. (33.3 L)
Expansion Tank DPN000329
1-1/2" (38.1mm)
3" (76.2mm)
6-1/8"
(155.6mm)
Rev. 0
Expansion Tank- (P/N 1C16717P1)
This tank, included in a standard pump package, has an internal volume of 8.8 gal. (33 l) and a
maximum pressure of 100 psi (690 kPa).
This tank is sized for a typical “open” system with a fluid volume of less than 75 gal. (280l). When
used in a “closed” system, volumes of up to 140 gal. (530 l) can be accommodated. The use of a safety
relief valve, field supplied, is recommended for systems “closed” to atmospheric venting. Other piping
accessories for filling, venting, or adjusting the fluid in the system, are recommended, but not
included.
Figure 21 Pump curve, 60 Hz
180
Curve
A
B
C
D
E
F
Total Head, Feet/Water
160
140
F
120
E
G
D
100
80
60
HP
3/4 (1-ph)
3/4 (3-ph)
1.5
2
3
5
7.5
G
C
B
A
40
20
0
10
20
30
40
50
60
70
80
120
Flow Rate, GPM
Liebert® PDX™ and Liebert PCW™
32
160
200
250
300
400
Electrical Data
6.0
ELECTRICAL DATA
Table 16
Electrical data for Liebert PDX and PCW - 60Hz units
With Electric Reheat
and Humidifier
Model
PX018
PX023
PX029
PW017
PW029
With Electric
Humidifier
With Standard
Reheat
No Reheat
No Humidifier
Voltage
FLA
WSA
OPD
FLA
WSA
OPD
FLA
WSA
OPD
FLA
WSA
OPD
208
65.2
79.2
90
45.2
50.9
70
65.2
79.2
90
31.9
37.6
60
230
60.8
73.7
80
43.0
48.7
70
60.8
73.7
80
31.9
37.6
60
380
32.2
39.0
45
23.1
26.1
35
32.2
39.0
45
17.0
20.0
30
460
29.3
35.6
40
20.7
23.4
30
29.3
35.6
40
14.9
17.6
25
575
24.1
29.3
30
18.9
21.0
25
24.1
29.3
30
11.5
13.6
20
208
70.4
85.7
100
50.4
57.4
80
70.4
85.7
100
37.1
44.1
70
230
66.0
80.2
100
48.2
55.2
80
66.0
80.2
100
37.1
44.1
70
380
36.0
43.8
50
26.9
30.9
45
36.0
43.8
50
20.8
24.8
40
460
32.5
39.6
50
23.9
27.4
40
32.5
39.6
50
18.1
21.6
35
575
26.8
32.7
40
21.6
24.4
35
26.8
32.7
40
14.2
17.0
25
208
73.9
90.1
100
53.9
61.8
90
73.9
90.1
100
40.6
48.5
70
230
69.5
84.6
100
51.7
59.6
90
69.5
84.6
100
40.6
48.5
70
380
38.9
47.2
60
29.8
34.3
50
38.9
47.2
60
23.7
28.2
45
460
35.6
43.3
50
27.0
31.1
45
35.6
43.3
50
21.2
25.3
40
575
28.9
35.2
40
23.7
26.9
35
28.9
35.2
40
16.3
19.5
30
208
55.8
69.8
70
22.5
28.1
30
42.5
53.1
50
9.2
11.5
20
230
49.2
61.5
70
20.3
25.4
30
38.1
47.6
45
9.2
11.5
20
380
26.2
32.8
35
11.0
13.8
15
20.1
25.1
25
4.9
6.1
15
460
24.2
30.3
35
9.8
12.3
15
18.4
23.0
20
4.0
5.0
15
575
23.2
29.0
30
10.6
13.3
15
15.8
19.8
20
3.2
4.0
15
208
55.8
69.8
70
22.5
28.1
30
42.5
53.1
50
9.2
11.5
20
230
49.2
61.5
70
20.3
25.4
30
38.1
47.6
45
9.2
11.5
20
380
27.1
33.9
35
11.9
14.9
15
21.0
26.3
25
5.8
7.3
15
460
25.0
31.3
35
10.6
13.3
15
19.2
24.0
25
4.8
6.0
15
575
23.7
29.6
30
11.1
13.9
15
16.3
20.4
20
3.7
4.6
15
33
Liebert® PDX™ and Liebert PCW™
Electrical Data
Electrical Field Connections—Liebert MC™
6.1
Figure 22
Electrical field connections—Upflow and downflow models
5
6
Refer to specification sheet for total
unit full load amps, wire size amps
and max overcurrent protective device size.
6.2
7
DPN002933
Rev. 0
Terminal Block
for Customer
Connection
41 42 43 44 58 59 82 83 88 89 75 76 94 95 96 97 91 92 93 80 81 72 73
1
71 84 85
12
37 38 24 50 51 55 56
4
37C 38C 37B 38B
10
SH
10
2
49-1 49-3
11
37 38 24 50 51 55 56 70 71 84 85
11
3
37C 38C 37B 38B
15
SH
13
4
49-1 49-3
16
41 42 43 44 58 59 82 83 88 89 75 76 94 95 96 97 91 92 93 80 81 72 73
17
1
18
19
8
9
12
14
Standard Electrical Connections
Source: DPN002933, Rev. 0
1. Electric conduit knockouts on top and bottom of electric box; knockout size, 1.75in (44.5mm).
2. Three-phase connection—Electric service connection terminals.
3. Factory-installed disconnect switch—Fused disconnect switch provided on units.
4. Three-phase electric service field-supplied.
5. Earth ground connection—Connection terminal for field-supplied earth grounding wire.
6. Earth ground bar (optional)—Connection terminals with factory ground from each
high-voltage component for field-supplied earth grounding wire.
7. Control and monitoring section of electric box.
8. Remote unit shutdown—Replace existing jumper between Terminals 37 + 38 with normally
closed switch having a minimum 75VA, 24VAC rating. Use field-supplied Class 1 wiring. Two
additional contact pairs available as an option (labeled as 37B & 38B, 37C & 38C). Replace
existing jumper for appropriate pair as done for Terminals 37 & 38.
9. Remote Alarm Device (RAD) Connections—Field-supplied 24V Class 1 wiring for special
alarm. Connection made by adding normally open contacts. Special alarm connections may be
factory wired or field wired. See schematic, RADS1-4, for factory-wired special alarms. For
field-wired special alarms, use 24V Class 1 wiring to connect normally open contacts between
Terminals 24 & 50, 24 & 51, 24 & 55, or 24 & 56.
10. Smoke detector alarm connections—Field-supplied 24V Class 1 wiring to remote alarm
circuits. Factory-wired contacts from optional smoke detector are #91-Common, #92-NO, and
#93-NC. Optional smoke detector trouble connections #80 & # 81.
11. Common alarm connection—Field-supplied 24V Class 1 wiring to common alarm terminals 75
+ 76 (and optional 94 + 95, and 96 + 97), which are factory-connected to common alarm relay (R3).
Liebert® PDX™ and Liebert PCW™
34
Electrical Data
12. Heat rejection connection—Field-supplied 24V Class 1 wiring to interlock heat rejection from
pigtails 70 + 71 which are factory-connected to compressor side switch (self-contained units only)
or to GLYCOOL relay (K11, GLYCOOL units only).
On Dual Cool units only, pigtails 72 + 73 connect auxiliary cooling source to GLYCOOL relay K11.
See indoor and outdoor electric schematic for more information.
13. Reheat and Humidifier Lockout—Optional emergency power lockout of reheat and/or
humidifier: Connections provided for remote 24VAC source. Class 1 wiring to connections #82 &
#83.
14. Main Fan Auxiliary Switch—Optional main fan auxiliary side switch. Terminals located in
field wiring compartment for remote indication that the evaporator fan motor/unit is on. Field to
connect 24V maximum, Class 1 wiring to connections #84 & #85.
15. Optional Condensate Alarm (Dual Float Condensate Pump only)—Relay terminals located in
field wiring compartment for remote indication. Class 1 wiring to connections #88 & #89.
16. Optional Remote Liebert Liqui-tect® Indicator—Optional remote Liebert Liqui-tect
indicator for unit shutdown. Terminals located in field wiring compartment. Field to connect 24V
maximum, Class 1 wiring to connections #58 & #59.
17. Optional Analog Inputs #3 & #4—Customer connection to Terminals 41, 42, 43, 44 for analog
inputs.
18. Spare Terminals for Optional Devices—Customer connection when optional device is
supplied. See unit schematic.
19. Heat Rejection CANBUS Connection (AIR Units only)—Customer connection to terminals
49-1, 49-3 and SH.
35
Liebert® PDX™ and Liebert PCW™
Electrical Data
Figure 23 Electrical field connections for Liebert iCOM®—Downflow models
21
20
22
24 25
23
21
20
DPN002934
Rev. 0
20) Opening for field wiring; suggested entry point for high-voltage field wiring to unit.
21) Opening for field wiring; suggested entry point for low-voltage field wiring to unit.
22) Vacant Liebert IntelliSlot®; may contain optional Liebert IntelliSlot cards.
23) Populated Liebert IntelliSlot; optional Liebert IntelliSlot cards may be placed in either of two supplied Liebert
IntelliSlot locations.
24) Wire tie anchors; use to secure field-supplied network cables to Liebert IntelliSlot.
25) Wire tie anchors; use to secure customer Ethernet wiring to control board and display.
Liebert® PDX™ and Liebert PCW™
36
Electrical Data
Figure 24 Electrical field connections for Liebert iCOM®—Upflow models
21
24 25
22
23
20
20
DPN002935
Rev. 0
20) Opening for field wiring; suggested entry point for high-voltage field wiring to unit.
21) Opening for field wiring; suggested entry point for low-voltage field wiring to unit.
22) Vacant Liebert IntelliSlot; may contain optional Liebert IntelliSlot cards.
23) Populated Liebert IntelliSlot; optional Liebert IntelliSlot cards may be placed in either of two supplied Liebert
IntelliSlot locations.
24) Wire tie anchors. Use to secure field-supplied network cables to Liebert IntelliSlot.
25) Wire tie anchors. Use to secure customer Ethernet wiring to control board and display.
37
Liebert® PDX™ and Liebert PCW™
Electrical Data
6.3
Electrical Data—Liebert MC™ Condensers
Table 17
Electrical data, three-phase, 60Hz condenser, Premium Version (EC control)
Model
Small Platform
MCS028
Voltage
FLA
WSA
OPD
208/230V
3.0
3.8
15
460V
1.4
1.8
15
575V
1.2
1.5
15
Medium Platform
MCM040
MCM080
208/230V
2.3
3.2
15
460V
1.4
1.9
15
575V
1.2
1.6
15
208/230V
4.6
5.5
15
460V
2.8
3.3
15
575V
2.3
2.8
15
Large Platform
MCL055
MCL110
MCL165
1.
2.
208/230V
5.7
7.1
15
460V
2.8
3.5
15
575V
2.3
2.9
15
208/230V
11.4
12.8
15
460V
5.6
6.3
15
575V
4.7
5.3
15
208/230V
17.1
18.5
20
460V
8.4
9.1
15
575V
7.0
7.6
15
FLA = Full Load Amps; WSA = Wire Size Amps; OPD = Maximum Overcurrent Protection Device.
208V–575V premium models must be connected to wye three-phase systems.
Table 18
Electrical data, Liebert Lee-Temp™ receiver, 60Hz
Rated Voltage - Single-Phase
120
208/230
Watts/Receiver
150
300
150
300
Amps
1.4
2.8
0.7
1.4
Wire Size Amps
1.8
3.5
0.9
1.8
Maximum Overcurrent
Protection Device, Amps
15
15
15
15
The Liebert Lee-Temp receiver requires a separate power feed for heaters.
The condenser is not designed to supply power to the receiver heater pads.
Liebert® PDX™ and Liebert PCW™
38
Electrical Data
6.3.1
Wye- vs. Delta-Connected Power Supply
Figure 25 Wye- vs. delta-connected power supply connection diagram
Delta-Connected Power Diagram
Wye-Connected Power Diagram
Phase A
Winding
B
Phase A
Phase B
Winding
A-B
Winding
C-A
Winding
A
Phase B
Neutral
Winding
C
Winding B-C
Phase C
Phase C
NOTE
The Liebert MC Condenser is designed to operate with wye-connected power with a solidly
grounded neutral. Condenser power connections are provided for three-phase wire and earth
ground.
The Liebert MC condenser Premium EC fan models will not operate properly with
delta-connected power. A field-supplied isolation transformer or other power solutions will be
needed for proper condenser function.
Acceptable Power Supplies—208V to 480V Nominal Units
• 208V wye with solidly grounded neutral and 120V line-to-ground
• 380V wye with solidly grounded neutral and 220V line-to-ground
• 480V wye with solidly grounded neutral and 277V line-to-ground
Acceptable Power Supplies—575V Nominal Units
• 575V wye with solidly grounded neutral and 332V line to ground
(A step down transformer is provided in the Liebert unit to convert 575V input to 480V output to
operate the 480V EC motors)
Unacceptable Power Supplies—208V to 480V or 575V Nominal Units
•
•
•
•
Wye with high-resistance (or impedance) ground
Delta without ground or with floating ground
Delta with corner ground
Delta with grounded center tap
39
Liebert® PDX™ and Liebert PCW™
Electrical Data
Figure 26
CANbus connections between Liebert PDX and Liebert MC condenser (premium
CANL
TB50
CAN H
D58
J6
L
1
2
3
P15
A
1
OUTPUT
B
H
P80
TB50
J6 Termination Jumper
must be set to Pins 1 and 2.
1
H
3
TB49
J4
L
CANbus Addressing Switch
1
1
2
3
3
TB49
INPUT
ON
3
J6
CAN SW6
BOOTPSWD SYS APP
CONDENSER
ON
CAN SW6
1
1
2
3
1
2
3
DETAIL1
CAN Cable Connection (A)
A
Low voltage field entrance
located on bottom left of
condenser enclosure
Shield Connection
SH
B
70
71
230
Factory Wiring Between
Liebert MC Control Board
and Terminal Strip
B
Heat Rejection Interlock Wire
A
Canbus Cable Connection
Heat Rejection Interlock (B)
INDOOR UNIT
58
58
59
49-3
82
SH
83
37-C
88
38-C 87-B
89
88-B
76
38
95
24
96
50
50
97
51
51
91
55
55
92
56
56
93
70
70
80
71
71
81
75
49-1
24
94
94
38
76
88-B
75
38-C 87-B
89
37-C
88
SH
83
49-3
82
49-1
59
COMPONENT NOTES
1. Component appearance, orientation and positioning
may vary. Terminal names and callouts remain constant.
2. All circuits to these connection points are Class 2.
CABLE NOTES (A):
1. Field-supplied cable.
● shielded
● 22-18AWG stranded tinned copper
● twisted pair (minimum 4 twists per foot)
● low capacitance (15pf/ft or less)
● must be rated to meet local codes and conditions.
examples Belden 89207 (plenum rated), or Alpha Wire 6454
Category 5, 5e, or higher.
2. Do not run in same conduit, raceway, or chase as high
voltage wiring.
3. Contact factory for CANbus network lengths greater than
350ft. (107m)
WIRE NOTES (B):
1. Field-supplied wire
● 18AWG or greater
● rated 600V
2. Run two wires from indoor unit to condenser.
95
96
97
91
92
93
80
81
Partial View
DPN003266
Rev. 0
Liebert® PDX™ and Liebert PCW™
40
Electrical Data
6.4
Standard Electrical Connections, Liebert MC, Premium Efficiency Control
Figure 27 Standard connections, Premium Efficiency Control
Fan 2
Fan 1
Liebert Lee-Temp receiver tank 1 per circuit).
NOTE: Heater pad voltage available
for 120V/1 phase/60 Hz or 230V/1 phase/60Hz
150 or 300 Watt, varies by condenser
Fan 2
Fan 1
Electrical connection
box with cover;
cover removed
Without Liebert
Lee-Temp
Electrical service connection.
With Liebert
Lee-Temp
Pigtails in electric handy box
are factory-wired to Liebert Lee-Temp
heater pads for field-connection
of separate continuous electric
source; wire not by Emerson.
1
5A
5B
6
4
2
5C
7
11
Left
Knockout
8
10
9
3
Right Two
Knockouts
12
13
70
71
DPN002169 DPN002374
Pg. 1, Rev. 3 Pg. 1, Rev. 2
230
41
Liebert® PDX™ and Liebert PCW™
Electrical Data
Source: DPN002169, Rev. 3
1. Three-phase electrical service—Terminals are on top of disconnect switch for one-fan and
two-fan units. Terminals are on bottom of disconnect switch for three-fan and four-fan units.
Three-phase service not by Emerson. See Note 5.
2. Earth ground—Field lug terminal for earth ground connection. Ground terminal strip for fan
motor ground connection.
3. Primary high voltage entrance—Two knockouts 7/8" (22.2mm) diameter at the bottom of the
enclosure.
4. SPD field connection terminals—High-voltage surge protective device (SPD) terminals. SPD
is an optional device.
5. CANbus terminal connections—Field terminals for CANbus cable connection.
• 5A is the CANbus connectors.
• TB49-1 is the input terminal for CANbus high.
• TB49-3 is the input terminal for CANbus low.
• TB50-1 is output terminal for CANbus high.
• TB50-3 is the output terminal for CANbus low.
• Each CANbus cable shield is connected to terminal “SH”, Item 9.
• 5B is the “END OF LINE” jumper.
• 5C is the CANbus “DEVICE ADDRESS DIP SWITCH”. CANbus cable not by Emerson. See
Note 2.
6. Remote unit shutdown—Replace existing jumper between terminals TB38-1 and TB38-2 with
field-supplied normally closed switch having a minimum 75VA 24VAC rating. Use field-supplied
Class 1 wiring (optional feature; may be user specified).
7. Alarm terminal connections
a. Common Alarm Relay indicates when any type of alarm occurs. TB74-1 is common, TB74-2 is
normally open and TB74-3 is normally closed. 1 Amp 24VAC is the maximum load. Use
field-supplied Class 1 wiring.
b. Shutdown Alarm Relay indicates when condenser loses power, or when a critical alarm has
occurred that shuts down the condenser unit. TB74-4 is common; TB74-5 is normally open;
and TB74-6 is normally closed. 1 Amp 24VAC is the maximum load. Use field-supplied
Class 1 wiring.
8. Indoor unit interlock and SPD alarm terminals
a. On any call for compressor operation, normally open contact is closed across Terminals 70 and
71 for Circuit 1, and normally open contact is closed across Terminals 70 and 230 for Circuit 2
from indoor room unit.
b. During SPD alarm, normally open contact is closed across Terminals 12 and 13. SPD is an
optional device.
9. CANbus shield terminal—Terminal for field connection of the CANbus field-supplied cables.
The shield of CANbus field-supplied cables must not be connected to ground.
10. Primary low voltage entrance—One knockout, 7/8" (22.2mm) diameter, that is free for
customer low-voltage wiring.
11. SPD entrance – One knockout, 7/8" (22.2mm) diameter, at the bottom of the enclosure. High
voltage surge protective device (SPD) is optional
Liebert® PDX™ and Liebert PCW™
42
Electrical Data
NOTES:
1.
2.
•
•
•
•
•
•
•
•
6.5
Refer to specification sheet for unit voltage rating, full load amp, and wire size amp ratings.
The CANbus wiring is field supplied and must be:
Conductors 22-18AWG stranded tinned copper
Twisted pair (minimum 8 twists per foot)
Braided shield or foil shield with drain wire
Shield must be wired to ground at indoor unit
Low Capacitance (15pF/FT or less)
UL approved temperature rated to 75°C
UL approved voltage rated to 300V
UV-resistant and moisture-resistant if not run in conduit
Examples: Belden part number 89207(plenum rated) or Alpha Wire part number 6454 (UV
resistant outdoor rated) category 5, 5e or higher.
Electrical Data—Drycoolers
Table 19
60Hz electrical values—Drycoolers without pump controls
# of Fans
Drycooler Model #
Voltage
Phase
FLA
WSA
OPD
208/230
3
7.0
7.9
15
460
3
3.4
3.8
15
575
3
2.8
3.2
15
Standard Models
2
174, 225
Values are calculated per UL 1995. OPD values may be adjusted higher than calculations to compensate for maximum
anticipated application temperatures.
Table 20
60Hz electrical values—Drycoolers with pump controls, 3/4 hp pump, standard models
# of Fans
Drycooler Model #
2
Voltage
Phase
FLA
WSA
OPD
208/230
3
10.5
11.4
15
460
3
5
5.4
15
575
3
4.1
4.5
15
174, 225
Table 21
60Hz pump FLA values
Input Power, Volts
Pump hp
208/230
460
575
3/4
3.5
1.6
1.3
Values based on NEC handbook values for 3-phase motors.
43
Liebert® PDX™ and Liebert PCW™
Electrical Data
Figure 28
Fan speed control direct drive drycoolers
Factory-wired to 24V
Class 2 control circuit.
Factory-wired to components
on electric panel.
Electric service connection
to fuse block (factory-wired).
Electric service
connection terminals
for field wiring.
Factory-installed
disconnect switch.
Control Interlock
Class 2 wiring to
interlock drycooler 24V
controls to Liebert
room unit. 7/8 in.
(22.2mm) diameter hole
provided in bottom of
electric box.
Electric service connection
terminals for power supply to
pumps when pump controls
are factory-supplied. 7/8 in.
(22.2mm) diameter knockouts
provided in bottom of
electric box. Three
terminals for three-phase
pump option only.
Pump fuses & overload
heaters (shipped with
standard pump packages)
are to be field-installed
in pump fuse block(s)
and starter(s).
Earth ground connection (60Hz).
Connection terminal for fieldsupplied earth grounding wire.
Earth ground bar (50Hz).
Connection terminals with factory
ground from each high voltage
component for field-supplied
earth grounding wire.
Liebert® PDX™ and Liebert PCW™
Electric service entrance.
A 7/8 in (22.2mm) diameter hole
in a 1-1/8 in (28.6mm) knockout
provided in bottom of electric
box.
Refer to specification sheet for full load amp
and wire size amp ratings.
44
Electric service.
Single-phase, not by Emerson.
Three-phase, not by Emerson (for
three-phase pump option only).
DPN000277
Rev. 1
Electrical Data
Figure 29
Fluid temperature control direct drive drycoolers
Factory-wired to 24V
Class 2 control circuit
Factory-wired to components
on electric panel
Electrical service connection
terminals when factory
disconnect is not supplied.
Fuse block supplied on
DNT drycoolers.
Electric service connection
terminals when factory
disconnect is supplied.
Factory-installed
disconnect switch
(optional).
Unit Alarm Connection
Field-supplied 24V.
Class 2 wiring to
Terminals "24 & 50"
to indicate "Standby Glycol
Pump On". (Supplied
with dual pump controls
only.)
Control interlock
Field-supplied
Class 2 wiring to
interlock drycooler
24V controls to
Liebert room unit
(Not required on
CSU 3000). 7/8"
(22.2mm) diameter
hole provided in
bottom of electric box.
Flow switch connection
(Dual pump controls only)
Field-supplied 24V Class 2
wiring from terminals 74 +
77 to field mounted flow
switch.
Pump fuses & overload
heaters (shipped with
standard pump packages)
are to be field-installed in
pump fuse block(s) and
starter(s).
Earth ground bar (50Hz).
Connection terminals with factory
ground from each high voltage
component for field-supplied
earth grounding wire.
Electric service connection
terminals for power supply to
pumps when pump controls
are factory-supplied. Dual
pump connection shown. 7/8"
(22.2mm) diameter knockouts
provided in bottom
of electric box.
Earth ground connection (60 HZ).
Connection terminal for fieldsupplied earth grounding wire.
Electric service entrance.
A 7/8" (22.2mm) diameter hole
in a 1-1/8" (28.6mm) knockout
provided in bottom of electric
box.
Refer to specification sheet for full load amp and wire size amp ratings.
45
Electric service.
not by Emerson.
(Field-wired to Liebert
CSU 3000.
Interconnecting wiring
not by Emerson).
DPN000276
Rev. 1
Liebert® PDX™ and Liebert PCW™
Piping
7.0
PIPING
Table 22
Recommended refrigerant line sizes - OD copper (inches)*
Standard Scroll and Digital Scroll Models
Model
PX018
PX023
PX029
Equivalent
Length
Hot Gas
Line
Liquid
Line
Hot Gas
Line
Liquid
Line
Hot Gas
Line
Liquid
Line
50 ft. (15m)
5/8
1/2
3/4
5/8
7/8
5/8
100 ft. (30m)
5/8
1/2
3/4
5/8
7/8
5/8
150 ft. (45m)
5/8
1/2
3/4
5/8
7/8
5/8
300 ft. (91m)
7/8
5/8
7/8
5/8
1-1/8
3/4
Source: DPN000788, Rev. 0
Table 23
Indoor unit approximate refrigerant charge for R-410A
System Type
Air-Cooled
Table 24
Model
R-410A Charge
lb (kg)
PX018
5.0 (2.3)
PX023
5.3 (2.4)
PX029
5.8 (2.6)
Interconnecting piping refrigerant charge
R-410A, lb/100 ft. (kg/30m)
Line Size,
O.D., in.
Liquid Line
Hot Gas Line
3/8
3.2 (1.4)
—
1/2
5.9 (2.7)
0.7 (0.3)
5/8
9.6 (4.3)
1.1 (0.5)
3/4
14.3 (6.4)
1.6 (0.7)
7/8
19.8 (8.8)
2.3 (1.0)
1-1/8
33.8 (15.1)
3.9 (1.7)
1-3/8
51.5 (23.0)
5.9 (2.6)
Source: DPN003099, Rev. 0
Table 25
Condenser refrigerant charge
Approximate R-410A Refrigerant Needed
Standard
Condenser
Models
Condensers
Without Liebert Lee-Temp™
Condensers
With Liebert Lee-Temp
MCS028
2.5 (1.2)
18.3 (8.4)
MCM040
3.5 (1.6)
19.3 (8.8)
MCL055
5.0 (2.3)
24.2 (11.0)
MCM080
8.5 (3.8)
39.6 (18.1)
MCL110
10.7 (4.9)
49.0 (22.2)
MCL165
18.4 (8.4)
79.9 (36.2)
Source: DPN002411, Rev. 6
Liebert® PDX™ and Liebert PCW™
46
Piping
Figure 30
Piping schematic—Air-cooled models
LIEBERT MC CONDENSER
WITH LIEBERT LEE-TEMP RECEIVER
LIEBERT MC CONDENSER
Check
Valve
Relief Valve
Service
Valve
Liquid Return
Optional Field
Installed
Fusible Plug
Head Pressure
Control Valve
LIEBERT LEE-TEMP RECEIVER
CONDENSER
COIL
Liquid
CONDENSER
COIL
Hot Gas
Discharge
Liquid
Hot Gas Discharge
LIEBERT PDX AND ASSOCIATED PIPING
Liquid
EVAPORATOR
COIL
Sensing
Bulb
Digital Solenoid Valve
Suction
For rises over 25ft. (7.6m),
trap every 20ft. (6m) or
evenly divided*
Service
Valve
Check
Valve
Compressor
Service
Valve
External
Equalizer
Trap at base of risers
over 5ft. (1.5m)*
*Isolation
Valve
Hot Gas Discharge
Expansion
Valve
Solenoid Sight
Glass
Valve
Liquid Return
Filter Drier
*Isolation
Valve
* Components are not supplied by
Emerson but are required for
proper circuit operation and
maintenance
Refrigerant Piping
Field Piping
Service / Schrader (Access) Connection No Valve Core
Service / Schrader (Access) Connection With Valve Core
Schematic representation shown. Do not use for specific connection locations.
47
DPN002929
Rev. 2
Liebert® PDX™ and Liebert PCW™
Piping
Figure 31
Piping schematic—Water/glycol models
For systems with drycoolers,
refer to 5.0 - Heat Rejection—Drycoolers and Pumps.
LIEBERT
HEAT REJECTION
CUSTOMER
HEAT REJECTION
Drycooler
(Glycol)
Cooling Tower
and Pump
System
by Others
Expansion
Tank**
Optional Dual Pump System Shown
Pressure
Port*
Aquastat
Sensing
Bulbs
Hose
Bib* Shutoff Valve*
Glycol
Pumps
Check
Valves*
(on Dual Pump
Systems only)
Gate Valves*
Air Vents
(typical)***
Pressure Port*
Flow Switch
Supplied with Dual
Pump Systems
Flow-regulating
Valve*
Shutoff Valve*
Return Supply
Return
LIEBERT PDX UNIT
(and associated piping)
Return
Optional 3-Way
Motorized Ball Shutoff Valve*
Valve
Liquid
Digital Solenoid Valve
Sensing Bulb
Evaporator
Coil
Supply
Supply
Hose
Bib*
Shutoff Valve*
Hose
Bib*
Suction
Service
Valve
Service
Valve
Check
Valve Compressor
2-Way
Motorized
Ball Valve
External
Equalizer
Discharge
From
Liebert
iCOM
Control
Heat
Exchanger
Expansion
Valve
Sight Filter Drier
Glass
To
Liebert
iCOM
Control
Pressure
Transducer
*
Factory Piping
Field Piping
Optional Factory Piping
Service / Schrader (Access) Connection No Valve Core
Service / Schrader (Access) Connection with Valve Core
Components are not supplied by
Emerson but are requird for proper
circuit operation and maintenance
** Field installed at highest point in
system on return line to pumps
*** Locate at tops of all risers and
any intermediate system high points
DPN002931
Rev. 1
NOTE: Schematic representation shown.This schematic does not imply or define elevations and component location, unless
specifically noted.
Liebert® PDX™ and Liebert PCW™
48
Piping
Figure 32
Piping schematic—GLYCOOL models
For systems with drycoolers, refer
to 5.0 - Heat Rejection—Drycoolers
and Pumps.
Expansion
Tank**
LIEBERT
HEAT REJECTION
Drycooler
(Glycol)
Optional Dual Pump System shown
Glycol
Pumps
Check Valves*
(on Dual Pump
Systems only)
Pressure Port*
Aquastat
Sensing
Bulbs
Gate Valves*
Hose
Bib* Shut-Off Valve*
Air Vents
(typical)***
Pressure Port*
Flow Switch
Supplied with Dual
Pump Systems
Flow-Regulating
Valve*
Shutoff Valve*
Return
LIEBERT PDX UNIT
(and associated piping)
Liquid
Digital Solenoid Valve
Sensing Bulb
Evaporator
Coil
Suction
Service
Valve
Service
Valve
Check Compressor
Valve
Return
Econ-O-Coil
3-way
Chilled
Glycol Thermistor
Valve
3-Way
Motorized
Ball Valve
External
Equalizer
Discharge
Heat
Exchanger
Expansion
Valve
Sight Filter Drier
Glass
Shutoff Valve*
Hose
Bib*
Supply
Supply
Shutoff Valve*
Hose
Bib*
From
Liebert
iCOM
Control
To Liebert
iCOM
Control
Pressure
Transducer
Factory Piping
DPN002932
Components are not supplied by
Rev. 1
Emerson but are required for
proper circuit operation and
maintenance
** Field-installed at highest point in
system on return line to pumps
*** Locate at tops of all risers and
any intermediate system high points
*
Field Piping
Service / Schrader (access) connection no valve core
Service / Schrader (access) connection with valve core
NOTE: Schematic representation shown. This schematic
does not imply or define elevations and component location,
unless specifically noted.
49
Liebert® PDX™ and Liebert PCW™
Piping
Figure 33
Piping schematic, chilled water units
CUSTOMER
HEAT REJECTION
CHILLED
WATER
SUPPLY
RETURN
LIEBERT PCW
(And Associated Piping)
RETURN
Optional 3-way
Chilled Water
Valve
Bleed Valve
SUPPLY
Shutoff Valve*
Shutoff Valve*
Hose
Bib*
CHILLED
WATER
COIL
2-way
Chilled Water
Valve
Factory Piping
Field Piping
Optional Factory Piping
Schematic representation shown. This schematic does
not imply or define elevations and component location
unless specifically noted.
Liebert® PDX™ and Liebert PCW™
50
SUPPLY
Hose
Bib*
From
Liebert
iCOM
* Components are not supplied by
Emerson but are required for
proper circuit operation and
maintenance
DPN002930
Rev. 2
Piping
Figure 34
Optional piping schematic for Econ-O-Coil
Return Supply
Return Supply
Thermistor*
Thermistor*
Actuator
Return
Return
Supply
Actuator
Supply
Liebert Econ-O-Coil
Liebert Econ-O-Coil
Optional Liebert Econ-O-Coil (3-way valve)
Optional Liebert Econ-O-Coil (2-way valve)
* Supplied with 10 ft. (3m) extra thermistor wire for installation on field supply line.
1) Place thermistor in location where flow is always present.
2) Thermistor must be located out of the supply air stream.
51
Factory Piping
Field Piping
DPN002972
Rev. 0
Liebert® PDX™ and Liebert PCW™
Piping
Figure 35
Primary connection locations—Liebert PDX downflow, air-cooled models
All dimensions from
rear corner of unit
including panels
NOTE: Drawing not to scale.
Tolerance on all piping dimensions
All dimensions from
is ± 1/2" (13mm).
rear corner of unit
X
including panels
O
X
O
Y
ECS
Y
CD
33"
(837mm)
Electrical Top
Connections
ECR
L1
CE
E2
E1
HUM
LV3
E3
E4
TOP VIEW
Front of Unit
LV2
Front of Unit
34-1/2"
(876mm)
G1
LV1
Section A-A
28-1/2"
(725mm)
A
A
Supply Air
Discharge
Opening
30-1/2"
(775mm)
B
B
FRONT VIEW
Front
of Unit
Section B-B
* Field pitch Condensate Drain line a minimum of 1/8" (3.2 mm) per foot (305 mm). All units contain
a factory installed condensate trap. Do not trap external to the unit. Drain line may contain boiling water.
Select appropriate drain system materials. The drain line must comply with all local codes.
** Supplied on Dual Cooling Systems only (4 pipe system)
DPN002938
Rev. 2
Connection Size/Opening, in.
Point
Description
X, in. (mm)
Y, in. (mm)
PX018, PX023
PX029
L1
Liquid Line System 1
2-7/8 (73)
24-3/4 (630)
1/2"
5/8"
G1
Hot Gas Discharge 1
2-7/8 (73)
27-3/8 (694)
5/8"
7/8"
CD
Condensate Drain*
CE
Condensate Electrical
HUM
ECS
ECR
32 (811)
12-1/8 (309)
3/4
31-1/4 (796)
23-3/4 (606)
1-1/2
Humidifier Supply Line
32 (815)
30-1/8 (766)
1/4
Econ-O-Coil Supply **
2-7/8 (73)
7-5/8 (195)
1-1/8
Econ-O-Coil Return **
2-7/8 (73)
11-3/4 (298)
1-1/8
E1
Electrical Connection (High-Voltage) Bottom
31-1/2 (801)
28-3/8 (722)
7/8, 1-3/8, 1-3/4
E2
Electrical Connection (High-Voltage) Bottom
31-1/2 (801)
26-1/8 (665)
7/8, 1-3/8, 1-3/4
E3
Electrical Connection (High-Voltage) Top
31 (788)
27-3/4 (704)
7/8, 1-3/8, 1-3/4
E4
Electrical Connection (High-Voltage) Top
31 (788)
30 (760)
7/8, 1-3/8, 1-3/4
LV1
Electrical Connection (Low-Voltage) Bottom
2-3/4 (70)
30-1/4 (768)
1-1/8
LV2
Electrical Connection (Low-Voltage) Bottom
3-7/8 (98)
29-1/8 (740)
1-1/2
LV3
Electrical Connection (Low-Voltage) Top
31-5/8 (802)
24-7/8 (631)
1
Source: DPN002938, Rev. 2
Liebert® PDX™ and Liebert PCW™
52
Piping
Figure 36
Primary connections—Liebert PDX downflow, air cooled, front discharge models
X
Note: Drawing not to scale.
Tolerance on
all piping dimensions
is ± 1/2" (13mm).
O
All dimensions from All dimensions from
rear corner of unit
rear corner of unit
including panels
including panels
X
Y
ECS
Y
Electrical Top
Connections
O
33"
(837mm)
ECR
L1
LV1
E1
E2
G1
Front of Unit
Front of Unit
TOP VIEW
34-1/2" (876mm)
SECTION C-C
HUM
ECR
ECS
L1
G1
Z
CE
CD
Y
Without Right Side Discharge
Without Left Side Discharge
C
ECR
HUM
C
ECS
L1
G1
FRONT VIEW
CE
With Left Side Discharge
Z
CD
Y
With Right Side Discharge
1. Pipes at various heights to allow using tube cutter. These locations
will require stub tubes and elbows for connection.
2. Humidifier will need to be routed through this opening to the
connection at the left hand side of the unit.
* Field-pitch condensate drain line a minimum of 1/8" (3.2mm) per foot (305mm). All units contain
a factory-installed condensate trap. Do not trap external to the unit. Drain line may contain boiling
water. Select appropriate drain system materials. The drain line must comply with all local codes.
** Supplied on dual cooling systems only (four-pipe system)
DPN002945
Rev. 0
Connection Size/Opening, in.
Point Description
X, in. (mm)
Y, in. (mm)
Z, in. (mm)
PX018, PX023
PX029
L1
Liquid Line System
2-7/8 (73)
24-3/4 (630mm)
3 (76)
1/2
5/8
G1
Hot Gas Discharge
2-7/8 (73)
27-3/8 (694)
3 (76)
5/8
7/8
CD
Condensate Drain*
12-1/8 (309)
3 (76)
3/4 FPT
CE
Condensate Electrical
23-3/4 (606)
2-3/4 (70)
1-3/8
HUM Humidifier Supply Line
30-1/8 (766)
2-1/2 (64)
1/4
ECS Econ-O-Coil Supply **
2-7/8 (73)
7-5/8 (195)
3 (76)
1-1/8
ECR Econ-O-Coil Return **
2-7/8 (73)
11-3/4 (298)
3 (76)
1-1/8
E1
Electrical Connection (High-Voltage)
31 (788)
27-3/4 (704)
7/8, 1-3/8, 1-3/4
E2
Electrical Connection (High-Voltage)
31 (788)
30 (761)
7/8, 1-3/8, 1-3/4
LV1
Electrical Connection (Low-Voltage)
31-5/8 (802)
27-7/8 (631)
1
Source: DPN002945, Rev. 0
53
Liebert® PDX™ and Liebert PCW™
Piping
Figure 37
Primary connection locations—Liebert PDX downflow, water/glycol/GLYCOOL-cooled models
Note: Drawing not to scale.
Tolerance on
all piping dimensions
is ± 1/2" (13mm).
All dimensions from
rear corner of unit
including panels
All dimensions from
rear corner of unit
including panels
X
X
Y
O
WSG
ECS
ECR
CD
Y
Electrical Top
Connections
33"
(837mm)
WS
LV3
E3
CE
E2
E1
HUM
E4
Front of Unit
O
LV2
WR
Front of Unit
LV1
34-1/2" (876mm)
TOP VIEW
SECTION A-A
28-1/2"
(725mm)
A
B
Supply Air
Discharge Opening
A
FRONT VIEW
30-1/2"
(775mm)
B
SECTION B-B
* Field-pitch condensate drain line a minimum of 1/8" (3.2mm) per foot (305mm). All units contain
a factory-installed condensate trap. Do not trap external to the unit. Drain line may contain boiling
water. Select appropriate drain system materials. The drain line must comply with all local codes.
** Supplied on dual cooling systems only (four-pipe system)
Point
Description
DPN002942
Rev. 1
X in. (mm)
Y in. (mm)
Connection Size / Opening, in.
WS
Water/Glycol Supply
2-7/8 (74)
11-3/4 (297)
1-1/8
WR
Water/Glycol/GLYCOOL Return
2-7/8 (73)
27-3/8 (694)
1-1/8
WSG
GLYCOOL Supply
2-7/8 (73)
7-5/8 (195)
1-1/8
CD
Condensate Drain*
32 (811)
12-1/8 (309)
3/4
CE
Condensate Electrical
31-1/4 (796)
23-3/4 (606)
1-1/2
HUM
Humidifier Supply Line
32 (815)
30-1/8 (766)
1/4
ECS
Econ-O-Coil Supply **
2-7/8 (73)
7-5/8 (195)
1-1/8
ECR
Econ-O-Coil Return **
2-7/8 (73)
11-3/4 (298)
1-1/8
E1
Electrical Connection (High-Voltage) Bottom
31-1/2 (801)
28-3/8 (722)
7/8, 1-3/8, 1-3/4
E2
Electrical Connection (High-Voltage) Bottom
31-1/2 (801)
26-1/8 (665)
7/8, 1-3/8, 1-3/4
E3
Electrical Connection (High-Voltage) Top
31 (788)
27-3/4 (704)
7/8, 1-3/8, 1-3/4
E4
Electrical Connection (High-Voltage) Top
31 (788)
30 (760)
7/8, 1-3/8, 1-3/4
LV1
Electrical Connection (Low-Voltage) Bottom
2-3/4 (70)
30-1/4 (768)
1-1/8
LV2
Electrical Connection (Low-Voltage) Bottom
3-7/8 (98)
29-1/8 (740)
1-1/2
LV3
Electrical Connection (Low-Voltage) Top
31-5/8 (802)
24-7/8 (631)
1
Source: DPN002942, Rev. 1
Liebert® PDX™ and Liebert PCW™
54
Piping
Figure 38
Primary connection locations—Liebert PDX downflow, water/glycol/GLYCOOL-cooled, front
discharge models
All dimensions from
rear corner of unit
including panels
NOTE: Drawing not to scale.
Tolerance on
all piping dimensions
is ± 1/2" (13mm).
X
All dimensions from
rear corner of unit
including panels X
O
O
Y
Y
Electrical Top
Connections
33"
(837mm)
WSG
ECS
ECR
WS
LV1
E1
WR
E2
Front of Unit
Front of Unit
34-1/2" (875.9mm)
TOP VIEW
SECTION C-C
HUM
WS
ECR
WR
Without Left Side Discharge
Z
CE
C
CD
C
Y
Without Right Side Discharge
HUM
WS
ECR
ECS
FRONT VIEW
WR
With Left Side Discharge
Z
CE
Notes
1. Pipes at various heights to allow tube cutter to be used. Will
require stub tubes and elbows for connection at these locations.
2. Humidifier must be routed through this opening to the
connection at the left hand side of the unit.
CD
With Right Side Discharge
*
Field-pitch condensate drain line a minimum of 1/8" (3.2mm) per foot (305mm). All units contain
a factory-installed condensate trap. Do not trap external to the unit. Drain line may contain boiling
water. Select appropriate drain system materials.The drain line must comply with all local codes.
** Supplied on dual cooling systems only (four-pipe system)
Point Description
DPN002947
Rev. 0
X, in. (mm)
Y, in. (mm)
WS
Water/Glycol Supply
2-7/8 (74)
16-1/4 (413)
3 (76)
1-1/8
WR
Water/Glycol/GLYCOOL Return
2-7/8 (73)
27-3/8 (694)
3 (76)
1-1/8
Glycool Supply
2-7/8 (73)
7-5/8 (195)
3 (76)
1-1/8
WSG
Z, in. (mm) Connection Size / Opening, in.
CD
Condensate Drain*
—
21-1/8 (537)
3 (76)
3/4
CE
Condensate Electrical
—
22-3/4 (578)
2-3/4 (70)
1-3/8
HUM
Humidifier Supply Line
—
20 (508)
2-1/2 (64)
1/4
ECS
Econ-O-Coil Supply **
2-7/8 (73)
7-5/8 (195)
3 (76)
1-1/8
Econ-O-Coil Return **
ECR
2-7/8 (73)
11-3/4 (298)
3 (76)
1-1/8
E1
Electrical Conn. (High-Voltage) Bottom
31 (787)
27-3/4 (705)
—
7/8, 1-3/8, 1-3/4
E2
Electrical Conn. (High-Voltage) Bottom
31 (787)
30 (762)
—
7/8, 1-3/8, 1-3/4
LV1
Electrical Conn. (Low-Voltage) Bottom
—
1-1/8
31-5/8 (805) 24-7/8 (632)
Source: DPN002947, Rev. 0
55
Liebert® PDX™ and Liebert PCW™
Piping
Figure 39
Primary connection locations, Liebert PCW chilled water downflow models
NOTE: Drawing not to scale.
Tolerance on
all piping dimensions
is ± 1/2" (13mm).
All dimensions from
rear corner of unit
including panels
All dimensions from
rear corner of unit
O including panels
X
X
O
HWR
Y
Y
CD
Electrical Top
Connections
33"
(836.5mm)
HWS
WS
CE
E2
E1
HUM
LV3
E3
E4
WR
LV2
Front of Unit
TOP VIEW
Front of Unit
LV1
34-1/2" (875.9mm)
SECTION A-A
28-1/2"
(725mm)
A
A
Supply Air
Discharge Opening
30-1/2" (775.1mm)
B
*
FRONT VIEW
B
SECTION B-B
Field-pitch condensate drain line a minimum of 1/8" (3.2mm) per foot (305mm). All units contain
a factory-installed condensate trap. Do not trap external to the unit. Drain line may contain boiling
water. Select appropriate drain system materials. The drain line must comply with all local codes.
DPN002940
Rev. 1
Point
Description
X
Y
Connection Size / Opening
HWR
Hot Water Reheat Return (Optional)
2-7/8 (73)
7-5/8 (195)
5/8
HWS
Hot Water Reheat Supply (Optional)
2-7/8 (73)
11-3/4 (298)
5/8
Water Supply
2-7/8 (73)
7-5/8 (195)
1-1/8
WR
Water Return
2-7/8 (73)
11-3/4 (298)
1-1/8
CD
Condensate Drain*
32 (811)
12-1/8 (309)
3/4
CE
Condensate Electrical
31-1/4 (796)
23-3/4 (606)
1-1/2
HUM
Humidifier Supply Line
32 (815)
30-1/8 (766)
1/4
WS
E1
Electrical Connection (High-Voltage) Bottom
31-1/2 (801)
28-3/8 (722)
7/8, 1-3/8, 1-3/4
E2
Electrical Connection (High-Voltage) Bottom
31-1/2 (801)
26-1/8 (665)
7/8, 1-3/8, 1-3/4
E3
Electrical Connection (High-Voltage) Top
31 (788)
27-3/4 (704)
7/8, 1-3/8, 1-3/4
E4
Electrical Connection (High-Voltage) Top
31 (788)
30 (760)
7/8, 1-3/8, 1-3/4
LV1
Electrical Connection (Low-Voltage) Bottom
2-3/4 (70)
30-1/4 (768)
1-1/8
LV2
Electrical Connection (Low-Voltage) Bottom
3-7/8 (98)
29-1/8 (740)
1-1/2
LV3
Electrical Connection (Low-Voltage) Top
31-5/8 (802)
24-7/8 (631)
1
Source: DPN002940, Rev. 1
Liebert® PDX™ and Liebert PCW™
56
Piping
Figure 40
Primary connection locations, Liebert PCW chilled water downflow models, front discharge
X
NOTE: Drawing not to scale.
Tolerance on
all piping dimensions
is ± 1/2" (13mm).
O
All dimensions from
rear corner of unit
including panels
All dimensions from
rear corner of unit
including panels
X
Y
HWR
Y
Electrical Top
Connections
O
33"
(836.5mm)
HWS
WS
LV1
WR
E1
E2
Front of Unit
Front of Unit
TOP VIEW
34-1/2" (875.9mm)
SECTION C-C
HUM
HWS
HWR
WS
Without Left Side Discharge
WR
Z
CE
C
C
CD
Y
Without Right Side Discharge
HWS
HUM
FRONT VIEW
With Left Side Discharge
HWR
WS
WR
Z
CE
Notes
1. Pipes at various heights to allow tube cutter to be used.
Stub tubes and elbows required for connection at these locations.
2. Humidifier must be routed through this opening to the
connection at the left hand side of the unit
CD
Y
With Right Side Discharge
* Field-pitch condensate drain line a minimum of 1/8" (3.2mm) per foot (305mm). All units contain
a factory-installed condensate trap. Do not trap external to the unit. Drain line may contain boiling
water. Select appropriate drain system materials.The drain line must comply with all local codes.
DPN002946
Rev. 0
Point
Description
X, in. (mm)
Y, in. (mm)
Z, in. (mm)
Connection Size / Opening, in.
HWR
Hot Water Reheat Return (Optional)
2-7/8 (73)
7-5/8 (195)
3 (76)
5/8
HWS
Hot Water Reheat Supply (Optional)
2-7/8 (73)
11-3/4 (298)
3 (76)
5/8
Water Supply
2-7/8 (73)
24-3/4 (629)
3 (76)
1-1/8
WR
Water Return
2-7/8 (73)
27-3/8 (695)
3 (76)
1-1/8
CD
Condensate Drain*
—
21-1/8 (537)
3 (76)
3/4
CE
Condensate Electrical
—
22-3/4 (606)
2-3/4 (70)
1-1/2
HUM
Humidifier Supply Line
—
20 (508)
2-1/2 (64)
1/4
WS
E1
Electrical Conn. (High-Voltage) Top
31 (788)
27-3/4 (704)
—
7/8, 1-3/8, 1-3/4
E2
Electrical Conn. (High-Voltage) Top
31 (788)
30 (760)
—
7/8, 1-3/8, 1-3/4
LV1
Electrical Conn. (Low-Voltage) Top
31-5/8 (802)
24-7/8 (631)
—
1
Source: DPN002946, Rev. 0
57
Liebert® PDX™ and Liebert PCW™
Piping
Figure 41
Primary connection locations, Liebert PCW air-cooled upflow models
NOTE: Drawing not to scale.
Tolerance on all piping
dimensions is ± 1/2" (13mm).
34-1/2"
(876mm)
X
All dimensions from
rear corner of unit
O including panels
Y
ECS
CDP
ECR
32-1/2"
(828mm)
L1
G1
HUM
E2
E1
LV2
LV1
TOP VIEW
Front of Unit
30-1/2"
(775mm)
FRONT VIEW
28-1/2"
(725mm)
Supply Air
Discharge Opening
Dimensions from
rear bottom corner of
unit including panels
CD
Y
X
O
RIGHT SIDE VIEW
TOP VIEW
Front of Unit
*
Field pitch condensate drain line a minimum of 1/8" (3.2mm) per foot (305mm). All units
contain a factory installed condensate trap. Do not trap external to the unit. Drain line
may contain boiling water. Select appropriate drain system materials. The drain line must
comply with all local codes.
** Supplied on dual-cooling systems only.
DPN002939
*** Unit with front return shown. Bottom return with rear return floor stand also available.
Rev. 1
Connection Size/Opening, in.
Point
Description
X, in. (mm)
Y, in. (mm)
PX018, PX023
PX029
L1
Liquid Line System
1 5-1/8 (131)
25-5/8 (652)
1/2"
5/8"
G1
Hot Gas Discharge
1 2-7/8 (73)
25-5/8 (652)
5/8"
7/8"
Condensate Drain*
16-5/8 (422)
3-1/4 (80)
3/4 FPT
3-1/4 (83)
5-7/8 (149)
1/2"
CD
CDP
Condensate Drain with Pump
HUM
Humidifier Supply Line
29-1/2 (750)
26 (663)
1/4
ECS
Econ-O-Coil Supply **
4-1/4 (111)
3-1/4 (81)
1-1/8
ECR
2-5/8 (67)
10 (256)
1-1/8
E1
Electrical Connection (High-Voltage)
Econ-O-Coil Return **
31-1/4 (794)
30 (761)
7/8, 1-3/8, 1-3/4
E2
Electrical Connection (High-Voltage)
31-1/4 (794)
27-3/4 (702)
7/8, 1-3/8, 1-3/4”
LV1
Electrical Connection (Low-Voltage)
1-1/2 (38)
27-1/2 (699)
1
LV2
Electrical Connection (Low-Voltage)
1-1/2(38)
26-1/2 (673)
1
Source: DPN002939, Rev. 1
Liebert® PDX™ and Liebert PCW™
58
Piping
Figure 42
Primary connection locations—Liebert PDX upflow, water/glycol/GLYCOOL models
NOTE: Drawing not to scale.
Tolerance on all
piping dimensions
is ± 1/2" (13mm).
34-1/2"
(876mm)
X
All dimensions from
rear corner of unit
including panels
O
Y
ECS
CDP
ECR
32-1/2"
(828mm)
WS
HUM
E2
E1
WR
LV2
LV1
TOP VIEW
Front of Unit
FRONT VIEW
30-1/2"
(775mm)
Dimensions from
rear bottom corner of
unit including panels
CD
28-1/2"
(725mm)
Supply Air
Discharge Opening
Y
O
X
RIGHT SIDE VIEW
TOP VIEW
Front of Unit
*
Field-pitch condensate drain line a minimum of 1/8" (3.2mm) per foot (305mm). All units
contain a factory-installed condensate trap. Do not trap external to the unit. Drain line may
contain boiling water. Select appropriate drain system materials.The drain line must comply
with all local codes.
DPN002943
** Supplied on dual cooling systems only (4 pipe system)
Rev 0
*** Unit with front return shown. Bottom return with rear return floor stand also available.
Point
Description
X in. (mm)
Y in. (mm)
Connection Size / Opening, in.
WS
Water/Glycol/GLYCOOL
5-1/8 (74)
25-5/8 (297)
1-1/8
WR
Water/Glycol/GLYCOOL Return
2-7/8 (73)
25-5/8 (652)
1-1/8
16-5/8 (422)
3-1/4 (80)
3/4 FPT
3-1/4 (83)
5-7/8 (149)
1/2
CD
Condensate Drain*
CDP
Condensate Drain With Pump
HUM
Humidifier Supply Line
29-1/2 (750)
26 (663)
1/4
ECS
Econ-O-Coil Supply **
4-1/4' (111)
3-1/4 (81)
1-1/8
ECR
2-5/8 (67)
10 (256)
1-1/8
E1
Electrical Connection (High-Voltage)
Econ-O-Coil Return **
31-1/4 (794)
30 (761)
7/8, 1-3/8, 1-3/4
E2
Electrical Connection (High-Voltage)
31-1/4 (794)
27-3/4 (702)
7/8, 1-3/8, 1-3/4
LV1
Electrical Connection (Low-Voltage)
1-1/2 (38)
27-1/2 (699)
1
LV2
Electrical Connection (Low-Voltage)
1-1/2 (38)
26-1/2 (673)
1
Source: DPN002943, Rev. 0
59
Liebert® PDX™ and Liebert PCW™
Piping
Figure 43
Primary connection locations, Liebert PCW chilled water upflow models
NOTE: Drawing not to scale.
Tolerance on all piping
dimensions is ± 1/2" (13mm).
All dimensions from
rear corner of unit
including panels
34-1/2"
(875.8mm)
X
O
Y
CDP
32-1/2"
(828.0mm)
WS
HUM
E2
E1
WR
LV2
LV1
TOP VIEW
Front of Unit
30-1/2"
(775.0mm)
FRONT VIEW
28-1/2"
(725.0mm)
Dimensions from
rear bottom corner of
unit including panels
CD
Supply Air
Discharge Opening
Y
X
O
RIGHT SIDE VIEW
TOP VIEW
Front of Unit
*
Field-pitch condensate drain line a minimum of 1/8" (3.2mm) per foot (305mm). All units contain
a factory-installed condensate trap. Do not trap external to the unit. Drain line may contain boiling water.
Select appropriate drain system materials. The drain line must comply with all local codes.
** Unit with front return shown. Bottom return with rear return floor stand also available.
DPN002941
Rev. 0
Point
Description
X
in. (mm)
Y
in. (mm)
Connection Size / Opening, in.
WS
Water Supply
5-1/8 (131)
25-5/8 (652)
1-1/8
WR
Water Return
2-7/8 (73)
25-5/8 (652)
1-1/8
CD
Condensate Drain*
16-5/8 (422)
3-1/4 (80)
3/4 FPT
3-1/4 (83)
5-7/8 (149)
1/2
CDP
Condensate Drain With Pump
HUM
Humidifier Supply Line
29-1/2 (750)
26 (663)
1/4
E1
Electrical Connection (High-Voltage)
31-1/4 (794)
30 (761)
7/8, 1-3/8, 1-3/4
E2
Electrical Connection (High-Voltage)
31-1/4 (794)
27-3/4 (702)
7/8, 1-3/8, 1-3/4
LV1
Electrical Connection (Low-Voltage)
1-1/2 (38)
27-1/2 (699)
1
LV2
Electrical Connection (Low-Voltage)
1-1/2 (38)
26-1/2 (673)
1
Source: DPN002941, Rev. 0
Liebert® PDX™ and Liebert PCW™
60
Piping
Figure 44 Liebert MC Condenser piping—Single-circuit units
* Cover
Note: The Liebert
MC’s refrigerant lines
have traps inside the
unit; external traps
are not needed.
Fan 2
Leaving
Liquid
Line
Fan 1
Vertical
Horizontal
Horizontal
Entering
Field Piping
Hot Gas
Line
Optional fusible plug service kit to be brazed into the liquid line(s)
in either the vertical or horizontal position (where required).
Vertical position is recommended; horizontal position is optional.
Vertical
Leaving
Liquid
Line
Table 26
Model No.
MCS028 ONLY
DPN002166
Rev. 2
Liebert MC Condenser piping sizes, single-circuit units
Number
of Fans
Connection Sizes, OD, in (mm)
Hot Gas Line
Liquid Line
MCS028
1
7/8
5/8
MCM040
1
7/8
5/8
MCL055
1
1-1/8
7/8
MCM080
2
1-1/8
7/8
MCL110
2
1-3/8
1-1/8
MCL165
3
1-3/8
1-1/8
Source: DPN002166, Rev. 2
61
Liebert® PDX™ and Liebert PCW™
Piping
Figure 45 Condenser piping for single-circuit condensers (with Liebert Lee-Temp™)
Hot Gas Line
To Condenser
Entering Hot
Gas Line
B
Metal Clamp
Detail A-A
Position Elbow to
Direct Relief Valve
Downward
B VIEW
Leaving
Liquid Line
Liquid Line
From Condenser
Isolator
Fasten hot gas line to cabinet
using flat surface clamps with
isolators (field-supplied)
See Detail A-A
Field Piping
GENERAL ARRANGEMENT
Emerson-supplied piping assembly
will include one to three valves and check
valves depending on condenser capacity
and refrigerant
NOTE:
1.The following materials are supplied by liebert for each circuit (shipped loose with condenser) for field
installation: insulated Liebert Lee-Temp receiver with electric heater pads, sight glasses, head pressure
control valve, check valve, rotalock valve and pressure relief valve. All other piping to be supplied
DPN002167
and installed by others.
Rev. 5
2. Consult factory for proper line sizing for runs longer than 150ft.(45.7m) equivalent length.
Table 27
Condenser piping connection sizes—single-circuit condensers with Liebert Lee-Temp
Condenser
Connections, OD.In
Liebert Lee-Temp Connections
Model #
Hot Gas
Liquid
Hot Gas Tee
IDS, In.
Liquid Line
to Liebert
Lee-Temp Valve
ODS, In.
MCS028
7/8
5/8
7/8
5/8
5/8
MCM040
7/8
5/8
7/8
5/8
5/8
MCL055
1-1/8
7/8
1-1/8
7/8
7/8
Receiver Out
IDS, In.
MCM080
1-1/8
7/8
1-1/8
7/8
1-1/8
MCL110
1-3/8
1-1/8
1-3/8
1-1/8
1-1/8
MCL165
1-3/8
1-1/8
1-3/8
1-1/8
1-1/8
Source: DPN002167, Rev. 5
Liebert® PDX™ and Liebert PCW™
62
Piping
Figure 46
Piping connection locations for 1-, 2-, 3- and 4-fan drycoolers
Inlet Connection
(Upper Header)
Outlet Connection
(Lower Header)
DPN000275
Rev. 3
1/2" FPT Connections
EXPANSION TANK
(GLYCOOL CSU 3000
Units Supplied with
Compression Tank)
Table 28
Standard drycooler piping connection sizes and internal volume
No. of Internal No. of Dry Weight
Model # Coil Circuits
Fans
lb. (kg)
Internal
Volume,
gal. (L)
No. of
Inlets/Outlets
Inlet and Outlet Connection
Size, OD Copper, in.
174
8
2
540 (245)
6.9 (26.2)
1/1
2-1/8
197
16
2
580 (263)
9 (34)
1/1
2-1/8
225
26
2
620 (281)
11.1 (42.1)
1/1
2-1/8
260
16
3
735 (333)
10.0 (37.8)
1/1
2-1/8
350
16
3
795 (361)
13.1 (50.0)
1/1
2-1/8
63
Liebert® PDX™ and Liebert PCW™
Guide Specifications—Nominal 17, 18, 23 or 29kW Thermal Management System
8.0
GUIDE SPECIFICATIONS—NOMINAL 17, 18, 23 OR 29KW THERMAL
MANAGEMENT SYSTEM
1.0
GENERAL
1.1
SUMMARY
These specifications describe requirements for a mission critical environmental control system. The
system shall be designed to control temperature and humidity conditions in rooms containing
electronic equipment, with good insulation and vapor barrier. The manufacturer shall design and
furnish all equipment to be fully compatible with the heat dissipation requirements of the room.
1.2
DESIGN REQUIREMENTS
The precision environmental control system shall be a Liebert PDX or Liebert PCW factoryassembled unit. Standard 60Hz units shall be CSA-certified to the harmonized U.S. and Canadian
product safety standard, CSA C22.2 No 236/UL 1995 for Heating and Cooling Equipment and are
marked with the CSA c-us logo. It shall be specifically designed for service from the front and right
side of the unit. The system shall be designed for draw-through air arrangement to insure even air
distribution to the entire face area of the coil.
1.3
SUBMITTALS
Submittals shall be provided with the proposal and shall include: Single-Line Diagrams;
Dimensional, Electrical, and Capacity Data; Piping and Electrical Connection Drawings.
1.4
SERVICEABILITY/ ACCESS
The cabinet shall be designed so all components are easily accessible for service and maintenance
through the front and right sides of the unit.
2.0
PRODUCT
2.1
COOLING SYSTEM
2.1.1
Air-Cooled Refrigeration System—Model 018, 023, and 029
2.1.1.1 System Description
Single refrigeration circuit shall include a liquid line filter drier, a refrigerant sight glass with
moisture indicator, an expansion valve, pressure safety switches and a liquid line solenoid valve. The
indoor evaporator refrigerant piping shall be filled with a nitrogen holding charge and spun shut.
Field relief of the Schrader valve shall indicate a leak-free system.
2.1.1.2 Hydrophilic-Coated Evaporator Coil
Liebert PDX
Model 018
The direct-expansion, tilted-slab cooling coil shall have 9.9 ft2 (0.92 m2) face area, three rows deep. It
shall be constructed of copper tubes and hydrophilic coated aluminum fins. The hydrophilic coating
shall significantly improve the speed of condensate drainage from the fins and shall provide superior
water carryover resistance. One stainless steel condensate drain pan shall be provided. It shall have a
face velocity of 283 FPM (1.4 m/s) at 2800 CFM (4757 CMH).
Model 023
The direct-expansion, tilted-slab cooling coil shall have 9.9 ft2 (0.92 m2) face area, three rows deep. It
shall be constructed of copper tubes and hydrophilic coated aluminum fins. The hydrophilic coating
shall significantly improve the speed of condensate drainage from the fins and shall provide superior
water carryover resistance. One stainless steel condensate drain pan shall be provided. It shall have a
face velocity of 354 FPM (1.8 m/s) at 3500 CFM (5947 CMH).
Liebert® PDX™ and Liebert PCW™
64
Guide Specifications—Nominal 17, 18, 23 or 29kW Thermal Management System
Model 029
The direct-expansion, tilted-slab cooling coil shall have 9.9 ft2 (0.92 m2) face area, four rows deep. It
shall be constructed of copper tubes and hydrophilic coated aluminum fins. The hydrophilic coating
shall significantly improve the speed of condensate drainage from the fins and shall provide superior
water carryover resistance. One stainless steel condensate drain pan shall be provided. It shall have a
face velocity of 434 FPM (2.2 m/s) at 4300 CFM (7306 CMH).
2.1.1.3 R-410A Refrigerant
The system shall be designed for use with R-410A refrigerant, which meets the U.S. Clean Air Act for
phaseout of HCFC refrigerants.
2.1.1.4 Compressor
Digital Scroll Compressor
The compressor shall be an R-410A scroll-type with variable capacity operation from 20-100%,
commonly known as a Digital Scroll. The compressor solenoid valve shall unload the compressor to
provide variable capacity operation. The compressor shall have a suction gas cooled motor, EPDM
Rubber vibration isolators, internal thermal overloads, automatic reset high pressure switch with
lockout after three failure occurrences, rotalock service valves, low pressure transducer, and
crankcase heater. The compressor shall be removable and serviceable from the front of the unit. The
crankcase heater and a discharge check valve shall be provided for additional system protection from
refrigerant migration during Off cycles.
Compressor Sound Jacket (Optional)
The compressor sound jacket shall reduce the level of sound emitted from the compressor. It shall
consist of a 3/8 inch closed cell polymeric 4.5 - 8.5 lb/ft3 density jacket that encloses the compressor.
Standard Scroll Compressor
The compressor shall be an R-410A scroll-type with a suction gas-cooled motor, EPDM vibration
isolators, internal thermal overloads, automatic reset high pressure switch with lockout after three
failures, rotalock service valves, pump down and low pressure transducer. The crankcase heater and
a discharge check valve shall be provided for additional system protection from refrigerant migration
during Off cycles.
2.1.1.5 Expansion Valve
Thermostatic Expansion Valve (TXV)
A manual adjustable externally equalized expansion valve thermostatic expansion valve (TXV) shall
control the flow of liquid refrigerant entering the direct expansion coil. The TXV shall maintain
consistent superheat of the refrigerant vapor at the outlet of the evaporator coil over the unit's
operating range. The TXV shall prevent liquid refrigerant from returning to the compressor.
Precision Controlled Electronic Expansion Valve (Optional for Digital Scroll
Compressors)
A precision controlled electronic expansion valve expansion valve (EEV) shall be provided. The EEV
shall be of stepper-motor type. The EEV shall maintain consistent superheat of the refrigerant vapor
at the outlet of the evaporator coil over the unit's operating range. The valve shall be controlled by a
separate electronic controller. Superheat shall be determined through the suction pressuretemperature method
2.1.2
Dual Cool: Chilled Water + Air-Cooled Refrigeration (Model 018, 023, and 029)
2.1.2.1 System Description
Two independent circuits shall be included. The dual-cooling source system shall consist of an aircooled system with the addition of a free-cooling chilled water coil or free-coiling chilled glycol coil
(Econ-O-Coil), a modulating control valve and a comparative temperature sensor. The system shall be
able to function either as a modulating chilled water system or as a compressorized system, or a
combination of both. The primary cooling mode shall be chilled water. The secondary refrigeration
circuit shall include a liquid line filter drier, a refrigerant sight glass with moisture indicator, an
expansion valve, pressure safety switch, and a liquid line solenoid valve. The indoor evaporator
refrigerant piping shall be filled with a nitrogen holding charge and spun shut. Field relief of the
Schrader valve shall indicate a leak-free system. Switchover between the two cooling modes shall be
performed automatically by the microprocessor control.
65
Liebert® PDX™ and Liebert PCW™
Guide Specifications—Nominal 17, 18, 23 or 29kW Thermal Management System
2.1.2.2 Hydrophilic-Coated Evaporator Coil
Liebert PDX (Model 018, 023, and 029)
Model 018
The direct-expansion, tilted-slab cooling coil shall have 9.4 ft2 (0.87 m2) face area. The refrigeration
coil shall be three rows deep. The free-cooling chilled water coil shall have 9.4 ft2 (0.87 m2) face area.
The free-cooling chilled water coil shall be four rows deep. It shall be constructed of copper tubes and
hydrophilic coated aluminum fins. The hydrophilic coating shall significantly improve the speed of
condensate drainage from the fins and shall provide superior water carryover resistance. One
stainless steel condensate drain pan shall be provided. It shall have a face velocity of 298 FPM (1.5
m/s) at 2800 CFM (4757 CMH).
Model 023
The direct-expansion, tilted-slab cooling coil shall have 9.4 ft2 (0.87 m2) face area. The refrigeration
coil shall be three rows deep. The free-cooling chilled water coil shall have 9.4 ft2 (0.87 m2) face area.
The free-cooling chilled water coil shall be four rows deep. It shall be constructed of copper tubes and
hydrophilic coated aluminum fins. The hydrophilic coating shall significantly improve the speed of
condensate drainage from the fins and shall provide superior water carryover resistance. One
stainless steel condensate drain pan shall be provided. It shall have a face velocity of 372 FPM
(1.9 m/s) at 3500CFM (5947CMH).
Model 029
The direct-expansion, tilted-slab cooling coil shall have 9.4 ft2 (0.87 m2) face area. The refrigeration
coil shall be four rows deep. The free-cooling chilled water coil shall have 9.4 ft2 (0.87 m2) face area.
The free-cooling chilled water coil shall be four rows deep. It shall be constructed of copper tubes and
hydrophilic coated aluminum fins. The hydrophilic coating shall significantly improve the speed of
condensate drainage from the fins and shall provide superior water carryover resistance. One
stainless steel condensate drain pan shall be provided. It shall have a face velocity of 457 FPM
(2.3 m/s) at 4300 CFM (7306 CMH).
2.1.2.3 R-410A Refrigerant
The system shall be designed for use with R-410A refrigerant, which meets the U.S. Clean Air Act for
phaseout of HCFC refrigerants.
2.1.2.4 Compressor
Digital Scroll Compressor
The compressor shall be an R-410A scroll-type with variable capacity operation from 20-100%,
commonly known as a Digital Scroll. The compressor solenoid valve shall unload the compressor to
provide variable capacity operation. The compressor shall have a suction gas cooled motor, EPDM
Rubber vibration isolators, internal thermal overloads, automatic reset high pressure switch with
lockout after three failure occurrences, rotalock service valves, low pressure transducer, and
crankcase heater. The compressor shall be removable and serviceable from the front of the unit. The
crankcase heater and a discharge check valve shall be provided for additional system protection from
refrigerant migration during Off cycles.
Compressor Sound Jacket (Optional)
The compressor sound jacket shall reduce the level of sound emitted from the compressor. It shall
consist of a 3/8 inch closed cell polymeric 4.5 - 8.5 lb/ft3 density jacket that encloses the compressor.
Standard Scroll Compressor
The compressor shall be an R-410A scroll-type with a suction gas-cooled motor, EPDM vibration
isolators, internal thermal overloads, automatic reset high pressure switch with lockout after three
failures, rotalock service valves, pump down and low pressure transducer. The crankcase heater and
a discharge check valve shall be provided for additional system protection from refrigerant migration
during Off cycles.
Liebert® PDX™ and Liebert PCW™
66
Guide Specifications—Nominal 17, 18, 23 or 29kW Thermal Management System
2.1.2.5 Expansion Valve
Thermostatic Expansion Valve (TXV)
A manual adjustable externally equalized expansion valve thermostatic expansion valve (TXV) shall
control the flow of liquid refrigerant entering the direct expansion coil. The TXV shall maintain
consistent superheat of the refrigerant vapor at the outlet of the evaporator coil over the unit's
operating range. The TXV shall prevent liquid refrigerant from returning to the compressor.
Precision Controlled Electronic Expansion Valve—Optional for Digital Scroll
Compressors
A precision controlled electronic expansion valve expansion valve (EEV) shall be provided. The EEV
shall be of stepper-motor type. The EEV shall maintain consistent superheat of the refrigerant vapor
at the outlet of the evaporator coil over the unit's operating range. The valve shall be controlled by a
separate electronic controller. Superheat shall be determined through the suction pressuretemperature method
2.1.2.6 Dual-Cool: Free-Cooling Control Valve
Three-Way Motorized Ball Valve
The water circuit shall include a pre-piped 3-way motorized ball valve. The Liebert iCOM® control
shall manage the valve actuator movement to maintain the desired room conditions for various
entering water temperatures. Cooling capacity will be controlled by bypassing chilled water around
the coil.
Two-Way Motorized Ball Valve—Optional
The water circuit shall include a pre-piped 2-way motorized ball valve. The Liebert iCOM shall
manage the valve actuator movement to maintain the desired room conditions for various entering
water temperatures. The motorized ball valve travel for dehumidification shall be proportional.
2.1.2.7 Comparator Sensor
The system shall be equipped with a Liebert iCOM microprocessor-controlled comparator sensor that
permits free-cooling operation whenever entering chilled water temperature is below return-air
temperature. The comparator sensor shall be factory-installed on a free-cooling 3-way valve and fieldinstalled on a free-cooling 2-way valve.
2.1.2.8 System Design Pressure
Standard Pressure
The water circuit shall be designed for a pressure of 150PSI (1034kPa)
High Pressure (OPTIONAL)
The water circuit shall be designed for a pressure of 400PSI (2758kPa).
2.1.3
Water / Glycol Cooled Refrigeration System (Model 018, 023, and 029)
2.1.3.1 System Description
Single refrigeration circuit shall include a liquid line filter drier, an expansion valve. The water
piping shall be filled with a nitrogen holding charge and spun shut. Field relief of the Schrader valve
shall indicate a leak-free system
67
Liebert® PDX™ and Liebert PCW™
Guide Specifications—Nominal 17, 18, 23 or 29kW Thermal Management System
2.1.3.2 Hydrophilic-Coated Evaporator Coil
Liebert PDX (Model 018, 023, and 029)
Model 018
The direct-expansion, tilted-slab cooling coil shall have 9.9 ft2 (0.92m2) face area, three rows deep. It
shall be constructed of copper tubes and hydrophilic coated aluminum fins. The hydrophilic coating
shall significantly improve the speed of condensate drainage from the fins and shall provide superior
water carryover resistance. One stainless steel condensate drain pan shall be provided. It shall have a
face velocity of 283 FPM (1.4 m/s) at 2800 CFM (4757 CMH).
Model 023
The direct-expansion, tilted-slab cooling coil shall have 9.9 ft2 (0.92m2)) face area, three rows deep. It
shall be constructed of copper tubes and hydrophilic coated aluminum fins. The hydrophilic coating
shall significantly improve the speed of condensate drainage from the fins and shall provide superior
water carryover resistance. One stainless steel condensate drain pan shall be provided. It shall have a
face velocity of 354 FPM (1.8 m/s) at 3500 CFM (5947 CMH).
Model 029
The direct-expansion, tilted-slab cooling coil shall have 9.9 ft2 (0.92m2) face area, four rows deep. It
shall be constructed of copper tubes and hydrophilic coated aluminum fins. The hydrophilic coating
shall significantly improve the speed of condensate drainage from the fins and shall provide superior
water carryover resistance. One stainless steel condensate drain pan shall be provided. It shall have a
face velocity of 434 FPM (2.2 m/s) at 4300 CFM (7306 CMH).
2.1.3.3 R-410A Refrigerant
The system shall be designed for use with R-410A refrigerant, which meets the U.S. Clean Air Act for
phaseout of HCFC refrigerants.
2.1.3.4 Compressor
Digital Scroll Compressor
The compressor shall be an R-410A scroll-type with variable capacity operation from 20-100%,
commonly known as a Digital Scroll. The compressor solenoid valve shall unload the compressor to
provide variable capacity operation. The compressor shall have a suction gas cooled motor, EPDM
Rubber vibration isolators, internal thermal overloads, automatic reset high pressure switch with
lockout after three failure occurrences, rotalock service valves, low pressure transducer, and
crankcase heater. The compressor shall be removable and serviceable from the front of the unit. The
crankcase heater shall be provided for additional system protection from refrigerant migration during
Off cycles.
Compressor Sound Jacket (Optional)
The compressor sound jacket shall reduce the level of sound emitted from the compressor. It shall
consist of a 3/8 inch closed cell polymeric 4.5 - 8.5 lb/ft3 density jacket that encloses the compressor.
Standard Scroll Compressor
The compressor shall be an R-410A scroll-type with a suction gas-cooled motor, EPDM vibration
isolators, internal thermal overloads, automatic reset high pressure switch with lockout after three
failures, rotalock service valves, pump down and low pressure transducer. The crankcase heater shall
be provided for additional system protection from refrigerant migration during Off cycles.
Liebert® PDX™ and Liebert PCW™
68
Guide Specifications—Nominal 17, 18, 23 or 29kW Thermal Management System
2.1.3.5 Expansion Valve
Thermostatic Expansion Valve (TXV)
A manual adjustable externally equalized expansion valve thermostatic expansion valve (TXV) shall
control the flow of liquid refrigerant entering the direct expansion coil. The TXV shall maintain
consistent superheat of the refrigerant vapor at the outlet of the evaporator coil over the unit's
operating range. The TXV shall prevent liquid refrigerant from returning to the compressor.
Electronic Expansion Valve (Optional for Digital Scroll Compressors)
An electronically controlled expansion valve (EEV) shall be provided.The EEV shall be of steppermotor type. The EEV shall maintain consistent superheat of the refrigerant vapor at the outlet of the
evaporator coil over the unit's operating range. The valve shall be controlled by a separate electronic
controller. Superheat shall be determined through the suction pressure-temperature method.
2.1.3.6 Brazed-Plate Condenser
The condenser shall be an insulated, brazed-plate type. The plates are to be stainless steel material.
The primary side shall be piped to a condenser water source, and the secondary side shall be
connected to the refrigeration system. A field-supplied strainer is to be field-installed upstream of the
Liebert PDX, on the condenser water supply line. Water pressure rating of the condenser shall be
600psig DWP.
2.1.3.7 Condenser Motorized Ball Valve
Three-Way Valve
A pre-piped 3-way motorized ball valve shall control the water/glycol flow passing through the
insulated, brazed-plate condenser. The Liebert iCOM® control shall manage the valve actuator
movement to maintain the desired condensing temperature for various entering water temperatures.
Two-Way Valve (Optional)
A pre-piped 2-way motorized ball valve shall control the water/glycol flow passing through the
insulated, brazed-plate condenser. The Liebert iCOM control shall manage the valve actuator
movement to maintain the desired condensing temperature for various entering water temperatures.
The maximum differential pressure across the closed valve shall be 200 PSI (1379kPa).
2.1.3.8 System Design Pressure
Standard Pressure
The water/glycol circuit shall be designed for a pressure of 150PSI (1034kPa).
High Pressure (Optional)
The water/glycol circuit shall be designed for a pressure of 400PSI (2758kPa).
2.1.4
Dual Cooling Source System: Chilled Water + Water/ Glycol Cooled Refrigeration
(Models 018, 023, and 029)
2.1.4.1 System Description
Two independent circuits shall be included. The dual-cooling source system shall consist of a
water-cooled system with the addition of a free-cooling chilled water coil or free-cooling chilled glycol
coil (Econ-O-Coil), a modulating control valve and a comparative temperature sensor. The system
shall be able to function either as a modulating chilled water system or as a compressorized system,
or as a combination of the two. The primary cooling mode shall be chilled water. The secondary
refrigeration circuit shall include a liquid line filter drier and an expansion valve.
The water piping shall be filled with a nitrogen holding charge and spun shut. Field relief of the
Schrader valve shall indicate a leak-free system. Switchover between the two cooling modes shall be
performed automatically by the microprocessor control. Four (4) pipe connections shall be included on
water/glycol systems: Econ-O-Coil supply, Econ-O-Coil return, condenser supply and condenser
return.
69
Liebert® PDX™ and Liebert PCW™
Guide Specifications—Nominal 17, 18, 23 or 29kW Thermal Management System
2.1.4.2 Hydrophilic-Coated Evaporator Coil
Model 018
The direct-expansion, tilted-slab cooling coil shall have 9.4 ft2 (0.87 m2) face area. The refrigeration
coil shall be three rows deep. The Econ-O-Coil coil shall have 9.4 ft2 (0.87 m2) face area. The Econ-OCoil shall be four rows deep. It shall be constructed of copper tubes and hydrophilic coated aluminum
fins. The hydrophilic coating shall significantly improve the speed of condensate drainage from the
fins and shall provide superior water carryover resistance. One stainless steel condensate drain pan
shall be provided. It shall have a face velocity of 298 FPM (1.5 m/s) at 2800 ft3/m (4757 m3hr).
Model 023
The direct-expansion, tilted-slab cooling coil shall have 9.4 ft2 (0.87 m2) face area. The refrigeration
coil shall be three rows deep. The free-cooling cooling coil shall have 9.4 ft2 (0.87 m2) face area. The
free-cooling chilled water coil shall be four rows deep. It shall be constructed of copper tubes and
hydrophilic coated aluminum fins. The hydrophilic coating shall significantly improve the speed of
condensate drainage from the fins and shall provide superior water carryover resistance. One
stainless steel condensate drain pan shall be provided. It shall have a face velocity of 372 FPM
(1.9m/s) at 3500 ft3/m (5947 m3h).
Model 029
The direct-expansion, tilted-slab cooling coil shall have 9.4 ft2 (0.87 m2) face area. The refrigeration
coil shall be four rows deep. The free-cooling cooling coil shall have 9.4 ft2 (0.87 m2) face area. The freecooling chilled water coil shall be four rows deep. It shall be constructed of copper tubes and
hydrophilic coated aluminum fins. The hydrophilic coating shall significantly improve the speed of
condensate drainage from the fins and shall provide superior water carryover resistance. One
stainless steel condensate drain pan shall be provided. It shall have a face velocity of 457 FPM
(2.3m/s) at 4300 ft2/m (7306 m3hr).
2.1.4.3 R-410A Refrigerant
The system shall be designed for use with R-410A refrigerant, which meets the U.S. Clean Air Act for
phaseout of HCFC refrigerants.
2.1.4.4 Compressor
Digital Scroll Compressor
The compressor shall be an R-410A scroll-type with variable capacity operation from 20-100%,
commonly known as a Digital Scroll. The compressor solenoid valve shall unload the compressor to
provide variable capacity operation. The compressor shall have a suction gas cooled motor, EPDM
Rubber vibration isolators, internal thermal overloads, automatic reset high pressure switch with
lockout after three failure occurrences, rotalock service valves, low pressure transducer, and
crankcase heater. The compressor shall be removable and serviceable from the front of the unit. The
crankcase heater shall be provided for additional system protection from refrigerant migration during
Off cycles.
Compressor Sound Jacket (Optional)
The compressor sound jacket shall reduce the level of sound emitted from the compressor. It shall
consist of a 3/8-inch closed cell polymeric 4.5 - 8.5 lb/ft3 density jacket that encloses the compressor.
Standard Scroll Compressor
The compressor shall be an R-410A scroll-type with a suction gas-cooled motor, EPDM vibration
isolators, internal thermal overloads, automatic reset high pressure switch with lockout after three
failures, rotalock service valves, pump down and low pressure transducer. The crankcase heater shall
be provided for additional system protection from refrigerant migration during Off cycles.
Liebert® PDX™ and Liebert PCW™
70
Guide Specifications—Nominal 17, 18, 23 or 29kW Thermal Management System
2.1.4.5 Expansion Valve
Thermostatic Expansion Valve
A manual adjustable externally equalized expansion valve thermostatic expansion valve (TXV) shall
control the flow of liquid refrigerant entering the direct expansion coil. The TXV shall maintain
consistent superheat of the refrigerant vapor at the outlet of the evaporator coil over the unit's
operating range. The TXV shall prevent liquid refrigerant from returning to the compressor.
Electronic Expansion Valve—Optional for Digital Scroll Compressors
An electronically controlled expansion valve (EEV) shall be provided.The EEV shall be of steppermotor type. The EEV shall maintain consistent superheat of the refrigerant vapor at the outlet of the
evaporator coil over the unit's operating range. The valve shall be controlled by a separate electronic
controller. Superheat shall be determined through the suction pressure-temperature method.
2.1.4.6 Brazed-Plate Condenser
The condenser shall be an insulated, brazed-plate type. The plates are to be stainless steel material.
The primary side shall be piped to a condenser water source, and the secondary side shall be
connected to the refrigeration system. A field-supplied strainer is to be field-installed upstream of the
Liebert PDX, on the condenser water supply line. Water pressure rating of the condenser shall be
600 psig DWP.
2.1.4.7 Condenser Motorized Ball Valve
Three-Way Valve
A pre-piped three-way motorized ball valve shall control the water/glycol flow passing through the
insulated, brazed-plate condenser. The Liebert iCOM® shall manage the valve actuator movement to
maintain the desired condensing temperature for various entering water temperatures.
Two-Way Valve (Optional)
A pre-piped 2-way motorized ball valve shall control the water/glycol flow passing through the
insulated, brazed-plate condenser. The Liebert iCOM control shall manage the valve actuator
movement to maintain the desired condensing temperatures for various entering water temperatures.
The maximum differential pressure across the closed valve shall be 200 PSI (1379kPa).
2.1.4.8 Dual-Cool: Free-Cooling Control Valve
Three-Way Motorized Ball Valve
The water circuit shall include a pre-piped three-way motorized ball valve. The Liebert iCOM shall
manage the valve actuator movement to maintain the desired room conditions for various entering
water temperatures. Cooling capacity shall be controlled by bypassing chilled water around the coil.
Two-Way Motorized Ball Valve (OPTIONAL)
The water circuit shall include a pre-piped two-way motorized ball valve. The Liebert iCOM shall
manage the valve actuator movement to maintain the desired room conditions for various entering
water temperatures. The motorized ball valve travel for dehumidification shall be proportional.
2.1.4.9 2.1.4.9Comparator Sensor
The system shall be equipped with a Liebert iCOM microprocessor-controlled comparator sensor that
permits free-cooling operation whenever entering chilled water/glycol temperature is below return-air
temperature. The comparator sensor shall be factory-installed on a free-cooling three-way valve and
field-installed on a free-cooling two-way valve.
2.1.4.10 Design Pressure
Standard Pressure
The water circuit shall be designed for a pressure of 150PSI (1034kPa)
High Pressure—Optional
The water circuit shall be designed for a pressure of 400PSI (2758kPa).
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Liebert® PDX™ and Liebert PCW™
Guide Specifications—Nominal 17, 18, 23 or 29kW Thermal Management System
2.1.5
Glycool: Glycol Economizer + Glycol Refrigeration System (Model 018, 023, and 029)
2.1.5.1 System Description
The refrigeration circuit shall be included, constructed of copper tubes and sharing common
hydrophilic-coated aluminum fins. The refrigeration circuit shall include a liquid line filter drier and
an expansion valve. The water piping shall be threaded closed with a nitrogen holding charge.
Field-relief of the Schrader valve shall indicate a leak-free system.
2.1.5.2 Hydrophilic-Coated Evaporator Coil
Liebert PDX (Models 018, 023, and 029)
Model 018
The GLYCOOL™ unit shall have two independent cooling circuits, constructed of copper tubes with
hydrophilic-coated aluminum fins. The first cooling circuit shall be a chilled glycol circuit and
designed for closed-loop applications using properly treated glycol solutions. The second cooling
circuit shall be a direct expansion refrigeration circuit. The coil shall be constructed into the
tilted-slab. Each coil shall have 9.4 ft2 (0.87m2) face area. The chilled glycol circuit coil shall be four
rows deep. The direct expansion circuit coil shall be three rows deep. The hydrophilic coating shall
significantly improve the speed of condensate drainage from the fins and shall provide superior water
carryover resistance. The coil shall be provided with a stainless steel drain pan. It shall have a face
velocity of 298 FPM (1.5 m/s) at 2800 CFM (4757 CMH).
Model 023
The GLYCOOL unit shall have two independent cooling circuits, constructed of copper tubes with
hydrophilic-coated aluminum fins. The first cooling circuit shall be a chilled glycol circuit and
designed for closed-loop applications using properly treated glycol solutions. The second cooling
circuit shall be a direct expansion refrigeration circuit. The coil shall be constructed into the
tilted-slab. Each coil shall have 9.4 ft2 (0.87 m2) face area. The chilled glycol circuit coil shall be four
rows deep. The direct expansion circuit coil shall be three rows deep. The hydrophilic coating shall
significantly improve the speed of condensate drainage from the fins and shall provide superior water
carryover resistance. The coil shall be provided with a stainless steel drain pan. It shall have a face
velocity of 372 FPM (1.9 m/s) at 3500 CFM (5947 CMH).
Model 029
The GLYCOOL unit shall have two independent cooling circuits, constructed of copper tubes with
hydrophilic coated aluminum fins. The first cooling circuit shall be a chilled glycol circuit and
designed for closed-loop applications using properly treated glycol solutions. The second cooling
circuit shall be a direct expansion refrigeration circuit. The coil shall be constructed into the tiltedslab. Each coil shall have 9.4 ft2 (0.87m2) face area. The chilled glycol circuit coil shall be four rows
deep. The direct expansion circuit coil shall be four rows deep. The hydrophilic coating shall
significantly improve the speed of condensate drainage from the fins and shall provide superior water
carryover resistance. The coil shall be provided with a stainless steel drain pan. It shall have a face
velocity of 457 FPM (2.3 m/s) at 4300 CFM (7306 CMH).
2.1.5.3 R-410A Refrigerant
The system shall be designed for use with R-410A refrigerant, which meets the U.S. Clean Air Act for
phaseout of HCFC refrigerants.
2.1.5.4 Compressor
2.1.5.4.1 Digital Scroll Compressor
The compressor shall be an R-410A scroll-type with variable capacity operation from 20-100%,
commonly known as a digital scroll. The compressor solenoid valve shall unload the compressor to
provide variable capacity operation. The compressor shall have a suction gas-cooled motor, EPDM
rubber vibration isolators, internal thermal overloads, automatic reset high pressure switch with
lockout after three failures, rotalock service valves, low pressure transducer and crankcase heater.
The compressor shall be removable and serviceable from the front of the unit. The crankcase heater
shall be provided for additional system protection from refrigerant migration during Off cycles.
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Guide Specifications—Nominal 17, 18, 23 or 29kW Thermal Management System
Compressor Sound Jacket (Optional)
The compressor sound jacket shall reduce the level of sound emitted from the compressor. It shall
consist of a 3/8-inch closed cell polymeric 4.5 - 8.5 lb/ft3 density jacket that encloses the compressor.
Standard Scroll Compressor
The compressor shall be an R-410A scroll-type with a suction gas-cooled motor, EPDM vibration
isolators, internal thermal overloads, automatic reset high pressure switch with lockout after three
failures, rotalock service valves, pump down and low pressure transducer. The crankcase heater shall
be provided for additional system protection from refrigerant migration during Off cycles.
2.1.5.5 Expansion Valve
Thermostatic Expansion Valve
A manual adjustable externally equalized expansion valve thermostatic expansion valve (TXV) shall
control the flow of liquid refrigerant entering the direct expansion coil. The TXV shall maintain
consistent superheat of the refrigerant vapor at the outlet of the evaporator coil over the unit’s
operating range. The TXV shall prevent liquid refrigerant from returning to the compressor.
Electronic Expansion Valve (Optional for Digital Scroll Compressors)
An electronically controlled expansion valve (EEV) shall be provided.The EEV shall be of stepper
motor. The EEV shall maintain consistent superheat of the refrigerant vapor at the outlet of the
evaporator coil over the unit’s operating range. The valve shall be controlled by a separate electronic
controller. Superheat shall be determined through the suction pressure-temperature method.
2.1.5.6 Brazed-Plate Heat Condensers
The condenser shall be an insulated, brazed-plate type. The plates are to be stainless steel material.
The primary side shall be piped to a condenser water source, and the secondary side shall be
connected to the refrigeration system. A field-supplied strainer shall be field-installed upstream of
the Liebert PDX, on the water/glycol supply line. Water pressure rating of the condenser shall be
600psig DWP.
2.1.5.7 Three-Way GLYCOOL™ Valve
The GLYCOOL coil shall include a pre-piped, three-way motorized ball valve. The Liebert iCOM®
shall manage the valve actuator movement to maintain the desired room conditions for various
entering water temperatures.
2.1.5.8 Condenser Motorized Ball Valve
Three-Way Valve
A pre-piped three-way motorized ball valve shall control the water/glycol flow passing through the
insulated, brazed-plate condenser. The Liebert iCOM shall manage the valve actuator movement to
maintain the desired condensing temperature for various entering water temperatures.
2.1.5.9 Comparator Sensor
The system shall be equipped with a factory-installed Liebert iCOM microprocessor-controlled
comparator sensor that permits free-cooling operation whenever entering chilled glycol temperature
is below return air temperature.
2.1.5.10 System Design Pressure
Standard Pressure
The GLYCOOL circuit shall be designed for a pressure of 150PSI (1034kPa).
High Pressure—Optional
The GLYCOOL circuit shall be designed for a pressure of 400PSI (2758kPa).
2.1.6
Chilled Water System (Model 017 and 029)
2.1.6.1 System Description
The water circuit shall be designed to distribute water into the entire coil face area.
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Liebert® PDX™ and Liebert PCW™
Guide Specifications—Nominal 17, 18, 23 or 29kW Thermal Management System
2.1.6.2 Hydrophilic-Coated Evaporator Coil
Model 017
The chilled-water tilted-slab cooling coil shall be 9.7ft2 (0.90m2) face area, 2 rows deep. It shall be
constructed of copper tubes and hydrophilic coated aluminum fins. The hydrophilic coating shall
significantly improve the speed of condensate drainage from the fins and shall provide superior water
carryover resistance. The coil shall have a face velocity of 361 FPM (1.8m/s) at 3500 CFM (5947m3/h).
One stainless steel condensate drain pan shall be provided. The water circuit shall be filled with a
nitrogen holding charge and spun shut. Field relief of the Schrader valve shall indicate a leak-free
system.
Model 029
The chilled-water, tilted-slab cooling coil shall be 9.7 ft2 (0.9m2) face area, 4 rows deep. It shall be
constructed of copper tubes and hydrophilic-coated aluminum fins. The hydrophilic coating shall
significantly improve the speed of condensate drainage from the fins and shall provide superior water
carryover resistance. The coil shall have a face velocity of 495 FPM (2.5 m/s) at 4800 CFM (8155m3/h).
One stainless steel condensate drain pan shall be provided. The water circuit shall be filled with a
nitrogen holding charge and spun shut. Field relief of the Schrader valve shall indicate a leak-free
system.
2.1.6.3 Control Valve
Three-Way Motorized Ball Valve
A pre-piped three-way motorized ball valve controls the chilled water flow passing through the cooling
coil. The Liebert iCOM® control shall manage the valve actuator movement to maintain the desired
room conditions for various entering water temperatures. Cooling capacity shall be regulated by
varying the chilled water flow.
Two-Way Motorized Ball Valve—Optional
A two-way pre-piped way motorized ball valve shall control the chilled water flow through the cooling
coil. The Liebert iCOM control shall manage the valve actuator movement to maintain the desired
room conditions for various entering water temperatures. Cooling capacity shall be regulated by
varying the chilled water flow. The maximum differential pressure across the closed valve shall be
200 PSI (1379kPa).
2.1.6.4 System Design Pressure
Standard Pressure
The chilled water circuit shall be designed for a maximum system pressure of 150PSI (1034kPa).
High Pressure—Optional
The chilled water circuit shall be designed for a maximum system pressure of 400PSI (2758kPa).
2.2
FAN SECTION
2.2.1
Fan and Motor
The unit shall be equipped with one plug fan: integral direct driven fan with backward-curved blades
and electronically commutated DC motors; commonly referred to as EC fan. The fan speed shall be
variable and automatically regulated by the Liebert iCOM through all modes of operation. The fan
shall have a dedicated motor, fault monitoring circuitry and speed controller, which shall provide a
level of redundancy. The impeller shall be made of aluminum and dynamically balanced. The EC fan
shall be located within the unit. The EC fan shall also provide greater energy savings than
forward-curved centrifugal fan and variable speed drives.
Liebert® PDX™ and Liebert PCW™
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Guide Specifications—Nominal 17, 18, 23 or 29kW Thermal Management System
2.2.2
Air Flow Configuration
2.2.2.1 Upflow Supply
Upflow Supply with Front Air Return
The supply air shall exit from the top of the cabinet. The return air shall be through the front
factory-installed grilles. The EC fan shall be mounted on the top of the unit. The fan shall be located
to pull air through the filters and cooling coil to ensure even air distribution and maximum coil
performance.
Upflow Supply with Rear Air Return
The supply air shall exit from the top of the cabinet. The return air shall be through the rear of the
factory-supplied, 24" rear return, skirted floor stand assembly with air filters. The EC fan shall be
mounted on the top of the unit. The fan shall be located to pull air through the filters and cooling coil
to ensure even air distribution and maximum coil performance.
2.2.2.2 Downflow Configurations
Downflow Supply with Front Air Discharge
The supply air shall exit from the front of the cabinet opening. The EC fan shall be mounted on the
bottom of the unit. The fan shall be located to draw air through the filters and cooling coil to ensure
even air distribution and maximum coil performance.
Downflow Supply with Front and Right Side Air Discharge
The supply air shall exit from the front and right side cabinet openings. The EC fan shall be mounted
on the bottom of the unit. The fan shall be located to draw air through the filters and cooling coil to
ensure even air distribution and maximum coil performance.
Downflow Supply with Front Air and Left Side Air Discharge
The supply air shall exit from the front and left side cabinet openings. The EC fan shall be mounted
on the bottom of the unit. The fan shall be located to draw air through the filters and cooling coil to
ensure even air distribution and maximum coil performance.
Downflow Supply with Front, Right and Left Side Air Discharge
The supply air shall exit from the front, right and left side cabinet openings. The EC fan shall be
mounted on the bottom of the unit. The fan shall be located to draw air through the filters and cooling
coil to ensure even air distribution and maximum coil performance.
Downflow Supply with Discharge into Raised Floor
The supply air shall exit from the bottom of the unit directly into the raised floor. The EC fan shall be
mounted on the bottom of the unit. The fan shall be located to draw air through the filters and cooling
coil to ensure even air distribution and maximum coil performance.
2.3
CABINET CONSTRUCTION AND ACCESSIBILITY
2.3.1
Cabinet Construction
The exterior panels shall be 20 gauge steel and powder-coated with black color paint to protect
against corrosion. The exterior panels shall be insulated with 1/2" to 1" (12.7 to 25.4mm), 1-1/2 lb.
(0.68 kg) insulation. Front and side panels shall have captive, quarter-turn fasteners. The cabinet
shall be designed so that all components are serviceable and removable using the front and right sides
of the unit.
2.3.2
Double-Skin Panels (Optional)
The exterior panels shall be internally lined with 20 gauge galvanized steel, sandwiching the
insulation between the panels for easy cleaning.
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Liebert® PDX™ and Liebert PCW™
Guide Specifications—Nominal 17, 18, 23 or 29kW Thermal Management System
2.4
LOCKING DISCONNECT SWITCH
A locking-type fused disconnect switch shall be mounted in the electrical panel and shall be capable of
disrupting the flow of power to the unit. The locking type shall consist of a main unit switch
operational from outside the unit. The electric panel compartment shall be accessible only with the
switch in the Off position. The locking disconnect shall be lockable in support of lockout/tagout safety
programs.
2.5
SHORT-CIRCUIT CURRENT RATING (SCCR)
The electrical panel shall provide at least 65,000A SCCR.
2.6
FILTRATION
2.6.1
MERV 8 Filters
The filter shall be an integral part of the system and located within the cabinet. The filter shall be
deep-pleated, 2 in. (51mm) thick with a MERV 8 rating efficiency based on ASHRAE 52.2-2007. A
filter clog switch shall be included. Mesh type, cleanable filters shall be unacceptable.
2.6.2
MERV 11 Filters
The filter shall be an integral part of the system, located within the cabinet. The filter shall be deeppleated, 2 in (51mm) thick with a MERV 11 rating efficiency based on ASHRAE 52.2-2007. A filter
clog switch shall be included. Mesh type, cleanable filters shall be unacceptable.
2.6.3
Extra Filter Set—Optional
_______ extra set(s) of filters shall be provided per system.
2.7
ELECTRIC REHEAT (OPTIONAL)
Model 017 - Chilled Water
The reheat is a low-watt density 304/304 stainless steel finned-tubular electric reheat. The reheat
section shall include UL/CSA recognized safety switches to protect the system from overheating. The
capacity of the reheat shall be 45.1 kBTUH (13.2 kW) including motor heat. The electric reheat shall
be controlled in two stages. The reheat elements shall be accessible from the right of the cabinet.
Model 018 - Air-Cooled or Water/Glycol-Cooled
The reheat is a low-watt density 304/304 stainless steel finned-tubular electric reheat. The reheat
section shall include UL/CSA recognized safety switches to protect the system from overheating. The
capacity of the reheat shall be 46.4 kBTUH (13.6 kW) including motor heat. The electric reheat shall
be controlled in two stages. The reheat elements shall be accessible from the right of the cabinet.
Model 023 - Air-Cooled or Water/Glycol-Cooled
The reheat is a low-watt density 304/304 stainless steel finned-tubular electric reheat. The reheat
section shall include UL/CSA recognized safety switches to protect the system from overheating. The
capacity of the reheat shall be 47.5 kBTUH (13.9 kW) including motor heat. The electric reheat shall
be controlled in two stages. The reheat elements shall be accessible from the right of the cabinet.
Model 029 - Air-Cooled or Water/Glycol-Cooled
The reheat is a low-watt density 304/304 stainless steel finned-tubular electric reheat. The reheat
section shall include UL/CSA recognized safety switches to protect the system from overheating. The
capacity of the reheat coils shall be 51.6 kBTUH (15.1 kW) including motor heat. The electric reheat
shall be controlled in two stages. The reheat elements shall be accessible from the right of the cabinet.
Model 018 -Glycool, Dual-Cool Air-Cooled, Dual-Cool Water/Glycol
The reheat is a low-watt density 304/304 stainless steel finned-tubular electric reheat. The reheat
section shall include UL/CSA recognized safety switches to protect the system from overheating. The
capacity of the reheat shall be 49.2 kBTUH (14.4 kW) including motor heat. The electric reheat shall
be controlled in two stages. The reheat elements shall be accessible from the right of the cabinet.
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Guide Specifications—Nominal 17, 18, 23 or 29kW Thermal Management System
Model 023 -Glycool, Dual-Cool Air-Cooled, Dual-Cool Water/Glycol
The reheat is a low-watt density 304/304 stainless steel finned-tubular electric reheat. The reheat
section shall include UL/CSA recognized safety switches to protect the system from overheating. The
capacity of the reheat shall be 50.9 kBTUH (14.9 kW) including motor heat. The electric reheat shall
be controlled in two stages. The reheat elements shall be accessible from the right of the cabinet.
Model 029 -Glycool, Dual-Cool Air-Cooled, Dual-Cool Water/Glycol
The reheat is a low-watt density 304/304 stainless steel finned-tubular electric reheat. The reheat
section shall include UL/CSA recognized safety switches to protect the system from overheating. The
capacity of the reheat shall be 51.6 kBTUH (15.1 kW) including motor heat. The electric reheat shall
be controlled in two stages. The reheat elements shall be accessible from the right of the cabinet.
Model 029 - Chilled Water
The reheat is a low-watt density 304/304 stainless steel finned-tubular electric reheat. The reheat
section shall include UL/CSA recognized safety switches to protect the system from overheating. The
capacity of the reheat shall be 50.9 kBTUH (14.9 kW) including motor heat. The electric reheat shall
be controlled in two stages. The reheat elements shall be accessible from the right of the cabinet.
2.8
HOT WATER REHEAT—OPTIONAL ON CHILLED WATER UNITS ONLY
The hot water reheat coil shall have copper tubes and aluminum fins with a capacity of 41.3 kBTUH
(12.1 kW) including motor heat when supplied with 180°F (82.2°C) entering water temperature at
4 GPM (0.25 l/s) flow rate with a pressure drop of 12.8 PSI (38.3 kPa). The control system shall be
factory pre-piped with a two-way motorized control valve. A cleanable Y-strainer should be
field-supplied and installed on the hot water supply line.
2.9
INFRARED HUMIDIFIER
The humidifier shall be of the infrared type, consisting of high intensity quartz lamps mounted above
and out of the water supply. The evaporator pan shall be stainless steel and arranged to be
serviceable without disconnecting water supply lines, drain lines or electrical connections. The
complete humidifier section shall be pre-piped ready for final connection. The infrared humidification
system shall use bypass air to prevent overhumidification of the controlled space. The auto-flush
system shall automatically flush deposits from the humidifier pan. The system shall be field
adjustable to change the cycle time to suit local water conditions. The humidifier shall have a capacity
of 7.7 lb/h (3.5 kg/h).
2.10
STEAM GENERATING CANISTER HUMIDIFIER—OPTIONAL
A canister-type steam generating humidifier shall be factory-installed in the cooling unit and
operated by the Liebert iCOM®. It shall be complete with disposable cylinder, all supply and drain
valves, steam distributor and electronic controls. The need to change the canister shall be indicated
on the Liebert iCOM display. The humidifier is designed to operate with water conductivity from
330-670 (60Hz) microS/cm. System shall automatically fill and drain as well as maintain the required
water level based on conductivity. An air-gap within the humidifier assembly shall prevent back flow
of the humidifier supply water. The humidifier shall have a capacity of 10.8 lb/h (4.9 kg/h).
2.11
CONDENSATE PUMP
The dual-float condensate pump shall have a minimum capacity of 5 GPM (18.9 l/min) at 40 ft.
(12.2m) head. Pump shall be complete with integral primary and secondary float switches, pump,
motor assembly and reservoir. The secondary float shall send a signal to the local alarm and shut
down the unit upon high water condition. The condensate pump shall be factory-installed on upflow
units and field-installed on downflow units.
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Liebert® PDX™ and Liebert PCW™
Guide Specifications—Nominal 17, 18, 23 or 29kW Thermal Management System
2.12
LIEBERT ICOM® MICROPROCESSOR CONTROL WITH LARGE GRAPHIC DISPLAY
The Liebert iCOM shall be factory-set to allow precise monitoring and control of the IT equipment it
is placed near. This control shall include predictive methods to control air flow and cooling capacity
based on supply and remote sensors. Proportional and Tunable PID shall also be user-selectable
options. Internal unit component control shall include the following:
Compressor Short Cycle Control—Shall prevent compressor short-cycling and needless
compressor wear.
System Auto Restart—The auto restart feature shall automatically restart the system after a
power failure. Time delay shall be programmable.
Sequential Load Activation—On initial startup or restart after power failure, each operational
load shall be sequenced with a minimum of one second delay to minimize total inrush current.
Predictive Humidity Control—Shall calculate the moisture content in the room and prevent
unnecessary humidification and dehumidification cycles by responding to changes in dew point
temperature.
The Liebert iCOM shall be compatible with all Liebert remote monitoring and control devices.
Options shall be available for BMS interface via Modbus, HTTP, BACnet and SNMP.
The Liebert iCOM shall be microprocessor-based with a 320x240 dot matrix graphic front monitor
display and control keys for user inputs mounted in an ergonomic, aesthetic housing. The display and
housing shall be viewable while the front panel is open or closed. The controls shall be menu driven.
The display shall be organized into three main sections: User Menus, Service Menus and Advanced
Menus with a secure login for each section. The system shall display user menus for active alarms,
event log, graphic data, unit view/status overview (including the monitoring of room conditions,
operational status in percentage of each function, date and time), total run hours, various sensors,
display setup and service contacts. A password shall be required to make system changes within the
service menus. Service menus shall include setpoints, standby settings (lead/lag), timers/sleep mode,
alarm setup, sensor calibration, maintenance/wellness settings, options setup, system/network setup,
auxiliary boards and diagnostics/service mode. A password shall be required to access the advanced
menus, which include the factory settings and password menus.
The User Menus Shall Be
• Active Alarms: Unit memory shall hold the 200 most recent alarms with time and date stamp
for each alarm.
• Event Log: Unit memory shall hold the 400 most recent events with ID number, time and date
stamp for each event.
• Graphic Data View: Two selectable graphic records shall be available from the following: return
air temperature, return air humidity, dew point, supply air temperature.
• Unit View - Status Overview: Simple or Graphical Unit View summary displays shall include
temperature and humidity values, active functions (and percent of operation) and any alarms of
the host unit.
• Total Run Hours: Menu shall display accumulative component operating hours for major
components including compressors, Econ-O-Coil (FC), fan motor, humidifier and reheat.
• Various Sensors: Menu shall allow setup and display of optional custom sensors.
• Display Language: Customer shall be able to select the desired language at the time of the
order from the following choices: English, French, Italian and Spanish.
• Service Contacts: Menu shall allow display of local service contact name and phone number.
• System View - Status Overview: System view shall display a summary of operation for the
total number of operating units within a Unit-to-Unit (U2U) configuration.
• Spare Parts List: Menu shall include a list of critical spare parts, their quantity and part
numbers.
• Unit Diary: Menu shall include a free field area within the unit memory where unit history may
be stored for reference.
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Guide Specifications—Nominal 17, 18, 23 or 29kW Thermal Management System
The Service Menus Shall Be
• Setpoints: Menu shall allow setpoints within the following ranges:
• Temperature Setpoint: 41-104°F (5-40°C)*
• Temperature Proportional Band: +1-50°F (-17 to 10°C)
• Fan Temperature Setpoint: 41-104ºF (5-40ºC)*
• Humidity Setpoint: 20-80% RH*
• Humidity Sensitivity: 1-30% RH
• High Temperature Alarm: 35-90ºF (2-32ºC)
• Low Temperature Alarm: 35-90ºF (2-32ºC)
• High Humidity Alarm: 15-85% RH
• Low Humidity Alarm: 15-85% RH
* The microprocessor may be set within these ranges; however, the unit may not be able to
control to extreme combinations of temperature and humidity.
• Standby Settings/Lead-Lag: Menu shall allow planned rotation or emergency rotation of
operating and standby units.
• Alarm Setup: Menu shall allow customer settings for alarm notification (audible/local/remote).
The following alarms shall be available:
• High Temperature
• Low Temperature
• High Humidity
• Low Humidity
• Compressor Overload—Optional
• Main Fan Overload—Optional
• Humidifier Problem
• High Head Pressure
• Change Filter
• Fan Failure
• Low Suction Pressure
• Unit Off
• Audible Alarm: The audible alarm shall annunciate any alarm that is enabled by the operator.
• Common Alarm: A programmable common alarm shall be provided to interface user-selected
alarms with a remote alarm device.
• Remote Monitoring: All alarms shall be communicated to the Liebert monitoring system with
the following information: date and time of occurrence, unit number and present temperature and
humidity.
• Sensor Calibration: Menu shall allow unit sensors to be calibrated with external sensors.
• Maintenance/Wellness Settings: Menu shall allow reporting of potential component problems
before they occur.
• Options Setup: Menu shall provide operation settings for the installed components.
• System/Network Setup: Menu shall allow Unit-to-Unit (U2U) communication and setup for
Teamwork modes of operation (up to 32 units).
• Teamwork Modes of Operation: Saves energy by preventing operation of units in opposite
modes multiple units.
• Diagnostics/Service Mode: The Liebert iCOM shall be provided with self-diagnostics to aid in
troubleshooting. The microcontroller board shall be diagnosed and reported as pass/not pass.
Control inputs shall be indicated as On or Off at the front display. Control outputs shall be able to
be turned On or Off from the front display without using jumpers or a service terminal. An LED
on a circuit board will indicate each control output.
The Advanced Menus Shall Be
• Factory Settings: Configuration settings shall be factory-set based on the pre-defined
component operation.
• Change Passwords: Menu shall allow new passwords to be set or changed.
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Liebert® PDX™ and Liebert PCW™
Guide Specifications—Nominal 17, 18, 23 or 29kW Thermal Management System
2.13
LIEBERT ICOM® CONTROL METHODS AND OPTIONS
Controlling Sensor Options: Liebert iCOM shall be flexible in the sense that it allows for
controlling the capacity and fan from multiple different sensor selections. The sensor selections shall
be:
•
•
•
•
•
•
•
•
•
Cooling Capacity:
Supply
Remote
Return
Fan Speed:
Supply
Remote
Return
Manual (for diagnostic or to receive a signal from the BMS through the IS-UNITY-DP card)
Teamwork Modes of Operation: Liebert iCOM teamwork shall save energy by preventing
operation of multiple units in opposing modes. The thee modes of teamwork operation are:
• Teamwork Mode 1: This mode allows the control to optimize a group of cooling units equipped
with Liebert iCOM’s using the U2U. The capacity and fan operations is coupled together in this
mode.
• Teamwork Mode 2: This mode allows the control to optimize a group of cooling units equipped
with Liebert iCOM’s using the U2U. The capacity and fan operations is decoupled in this mode,
meaning the fan and cooling ramp and respond to the thermal load based on its controlling
sensors.
• Optimized Aisle - Teamwork Mode 3: This mode allows the control to optimize a group of
connected cooling units equipped with Liebert iCOM’s using the U2U. The capacity and fan
operations is decoupled in this mode, meaning the fan and cooling ramp and respond to the
thermal load based on its controlling sensors. When using Optimized Aisle, the fans can be
controlled by using static pressure (DP or static) with a secondary remote temperature sensor as
an override to ensure the inlet rack temperature is being met.
Temperature Compensation: Liebert iCOM allows the ability to compensate the supply and return
set points to maintain cooling OR return temperatures to meet cooling needs or Service Level
Agreement (SLA) guidelines.
Dew Point Control: Liebert iCOM shall be able to control the humidity based on dew point to
ensure accurate humidity control. This method will eliminate the need to dehumidify or humidify
based on the air temperature when looking at moisture content.
Virtual Back-Draft Damper: Liebert iCOM allows for the use of a virtual back-draft damper eliminating the need for a mechanical damper. This allows the EC fan to spin at a low speed (15%) to
act as a damper.
Cascade: Liebert iCOM cascade option shall allow the units to turn On and Off based on heat load
when in Teamwork Mode 1. When utilizing Optimized Aisle, Teamwork Mode 3, the cascading shall
become more dynamic as the units coordinate the fan speed to save energy and to meet the cooling
demands. For instance, with a group of six cooling units equipped with Liebert iCOM’s and only 50%
of the heat load, the Liebert iCOM shall operate only four units at 80% fan speed and leave the other
two units in standby/cascade. As the heat load increases, the Liebert iCOM shall automatically
respond to the new load and bring on the fifth unit. As the heat load shifts up or down, the control
shall meet the needs by cascading units On or putting them into standby.
Virtual Master: The Liebert iCOM control shall allow for a virtual master that coordinates
operation. If for any reason the virtual master becomes disconnected, the control shall shift
responsibility to the next unit in the group.
Remote 2T Sensor Sharing: Each Liebert PDX/PCW unit can connect up to ten 2T sensors. The
2T sensors can be used as a controlling sensor or reference sensor. As part of the U2U network and
teamwork, those sensors can be shared and used to control the units and provide greater flexibility,
visibility and control using that to respond to changes in the data center. The 2T sensors can be set to
a minimum or maximum or average temperature control.
Liebert® PDX™ and Liebert PCW™
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Guide Specifications—Nominal 17, 18, 23 or 29kW Thermal Management System
Quick Start: Each Liebert PDX/PCW unit shall be equipped with a quick-start feature that allows
the unit to quickly recover from a loss of power.
Liebert MC Condenser: Liebert PDX (air-cooled) can be matched to a premium Liebert MC
condenser to provide an intelligent communication link. This shall enable enhanced monitoring and
alarming, diagnostics, low-noise mode and fan reversal for cleaning mode.
2.14
SUPPLY AIR SENSOR
2.14.1 Downflow—Raised Floor
The supply air temperature sensor shall provide real-time, direct feedback to the cooling unit to
provide a consistent supply air temperature by adjusting the compressor capacity or the chilled water
valve accordingly to maintain its setpoints.
2.14.2 Downflow—Front Discharge
The supply air temperature sensor shall provide real-time monitoring of the supply air temperature.
2.14.3 Upflow
The supply air temperature sensor shall provide real-time monitoring of the supply air temperature.
2.15
REMOTE TEMPERATURE AND HUMIDITY SENSORS—OPTIONAL
The unit shall be supplied with remote temperature and humidity sensors. The sensors shall be
connected to the unit by a (30 ft. [9m]), (60 ft. [18m]), (90 ft. [27m]), (120 ft. [36m]), (150 ft. [45m])
shielded cable.
2.16
RACK TEMPERATURE SENSORS—OPTIONAL
The Liebert PDX/PCW shall be provided with ____ 2T rack temperature sensors, which consist of a
vented case with two temperature probes. The sensors shall provide real-time, direct feedback to the
cooling unit to optimize the amount of cooling and airflow provided. The sensor data shall be available
to remote BMS and monitoring systems. The sensor network shall consists of one CAN wire leaving
the cooling unit and connecting to a 2T sensor. Each remaining 2T sensor is connected to the previous
sensor.
2.16.1 Additional CAN Cables for Rack Sensors—Optional
________ additional _______ feet (m) long CAN cables shall be provided.
2.17
HIGH TEMPERATURE SENSOR—OPTIONAL
The high temperature sensor shall immediately shut down the system when high temperatures are
detected. The high temperature stat shall be mounted in the electrical panel with the sensing element
in the return air.
2.18
SMOKE SENSOR—OPTIONAL
The smoke sensor shall sample the return air, shut down the unit upon activation and send visual
and audible alarms. Dry contacts shall be available for a remote customer alarm. This smoke sensor
is not intended to function as or replace any room smoke detection system that may be required by
local or national codes.
2.19
REMOTE SHUTDOWN TERMINAL
The remote shutdown terminal shall provide the customer with a location to remotely shut down the
unit, complying with the National Fire Code.
2.20
COMMON ALARM CONTACT
The common alarm contacts shall provide the customer with a set of normally open contacts for
remote indication of unit alarms. Four alarm contacts shall be provided for units without a
condensate pump. Three alarm contacts shall be provided for units with a condensate pump.
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Guide Specifications—Nominal 17, 18, 23 or 29kW Thermal Management System
2.21
LOW-VOLTAGE TERMINAL PACKAGE—OPTIONAL
One extra N/O common alarm contacts shall be provided. Two extra remote shutdown terminals shall
be provided. One pair of N/O contacts shall be factory-installed and wired to indicate Main Fan
Overload. One pair of N/O contacts shall be provided for Liebert Liqui-tect® signal shut down. (Liebert
Liqui-tect not included.)
2.22
REHEAT / HUMIDIFIER LOCKOUT—OPTIONAL
The reheat and humidifier lockout shall include the necessary relays to disable the reheat and
humidifier from an external 24V signal while on emergency power.
2.23
REMOTE HUMIDIFIER CONTACT—OPTIONAL
A pair of N/O contacts shall be factory-installed and wired to indicate Main Fan Overload.
2.24
COMPRESSOR OVERLOAD—OPTIONAL
A pair of N/O contacts shall be factory-installed and wired to each compressor to indicate Compressor
Overload
2.25
LIEBERT INTELLISLOT™ UNITY-DP™ CARD—OPTIONAL
The Liebert IntelliSlot Unity Card (IS-UNITY-DP) shall provide ground fault isolated RS-485
Modbus, BACnet IP and Modbus IP network connectivity to Building Management Systems for unit
monitoring and management. Also, it shall provide ground fault isolated 10/100 baseT Ethernet
connectivity for unit monitoring and management. The supported management interfaces include:
SNMP for Network Management Systems, HTTP for Web page viewing, SMTP for e-mail and SMS
for mobile messaging. The card shall support IP and 485 protocols simultaneous.
2.26
LIEBERT INTELLISLOT SITELINK-E® CARD—OPTIONAL
The Liebert IntelliSlot SiteLink-E Card shall provide ground fault isolated connection to a Liebert
SiteLink-E for monitoring and management. Liebert SiteLink-E supports Emerson interfaces as a
BACnet router that provides the communications link between Liebert units and other protocols and
modules. The Liebert SiteLink-E is designed to communicate with Liebert cooling units, UPS’s and
power distribution units and route the information over a BACnet, Modbus or LONWorks™ network
to a Building Automation System (BAS) workstation. Required for communication with Liebert
SiteScan® Web 4.0 or newer.
2.27
LIEBERT NFORM®—OPTIONAL ADVANCED MONITORING
The critical infrastructure management software shall centrally monitor and manage distributed
equipment using the customer’s existing network infrastructure. The system shall provide the critical
infrastructure management and monitoring for air conditioning systems, uninterruptible power
supply systems, power distributions units, static transfer switches, direct current power systems,
Alber® battery monitoring, rack enclosure monitoring, leak detection systems and other critical
infrastructure systems as specified. The system shall have an architecture that allows up to 10,000
managed devices, including Liebert and third-party devices, in a single-server installation.
Liebert® PDX™ and Liebert PCW™
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Guide Specifications—Nominal 17, 18, 23 or 29kW Thermal Management System
2.27.1 System Requirements
All material and equipment used shall be standard components, regularly manufactured and
available and not custom-designed especially for this project. All systems and components shall have
previously been thoroughly tested and proven in actual use prior to installation on this project.
The manufacturer shall furnish or supply a site-specific critical infrastructure management software
system based on customer requirements. The system must be a software-only solution; no
substitutions shall be accepted.
The system architecture shall consist of network interface cards that will be installed in all critical
infrastructures that, at a minimum, support HTTP and SNMP simultaneously.
The system shall receive SNMP traps from managed equipment and display the alarm notification in
a graphical user interface.
The system shall be based on SNMP open protocols and integrate seamlessly with Emerson Network
Power, Aperture® software suite and Network Management Systems.
Open protocol support shall include:
• HTTP(s)
• TCP/IP/v4, TCP/IP/v6
• SNMP v.1, SNMP v.2
The system shall have the capability of being remotely monitored and managed 24 hours a day, 7
days a week by the manufacturer.
The system shall have the ability to be deployed worldwide.
The system shall operate as a client-to-server application.
The Web interface of each managed device shall integrate directly into the system.
The system shall support Enterprise level databases including Microsoft® SQL™.
The system shall support exporting of all recorded parametric trend data.
The system shall operate on a server defined by the customer. Specific server brand or function is not
permissible.
The system shall support virtual server environments by default.
The system shall include one year of Software Assurance at no additional cost.
2.27.2 Approved Products
The critical infrastructure monitoring system shall be Liebert Nform® as manufactured by Emerson
Network Power®, Liebert Corporation. No substitutions shall be accepted.
2.27.3 Scope Of Work
2.27.3.1 Owner-Supplied Items
The critical infrastructure monitoring system shall be Liebert Nform as manufactured by Emerson
Network Power, Liebert Corporation. No substitutions shall be accepted.
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Liebert® PDX™ and Liebert PCW™
Guide Specifications—Nominal 17, 18, 23 or 29kW Thermal Management System
2.27.3.2 Scope of Work
Owner-Supplied Items
The owner shall furnish the following system components:
• Network (LAN) hardware and software required to provide an Ethernet backbone for transport of
IP data packets from network interface cards installed in all equipment to the critical
infrastructure server and to the Liebert Nform workstations. These components may include
hubs, routers, cabling, network operating systems, firewalls, IP addresses, Virtual Private
Network (VPN) and other components as required. The owner shall supply network drops for the
critical infrastructure server, workstation clients and all network-interfaced equipment.
• Dedicated critical infrastructure server meeting the following minimum requirements:
• Microsoft® Windows® 7, XP, 2003, Windows Vista® or Windows Server® 2008 operating system
• Pentium™ 3.0GHz single processor or better (1.8GHz dual processor or better recommended)
• 4 GB of RAM or more
• 40 GB hard drive (SCSI recommended)
• 10/100 BaseT network port or better
• Monitor / keyboard and mouse port as required for setup
• Standard USB ports
• CD or DVD-ROM drive for software installation (CD/DVD-RW suggested for installation and
backup)
• Critical infrastructure server may be virtual environment compatible
• Critical Infrastructure Workstation PCs meeting the following minimum requirements:
• System should meet the minimum requirements for Microsoft Windows 7, XP, 2003, Windows
Vista or Windows Server 2008 operating systems.
• Microsoft Internet Explorer® v6.0 or better
• 1 GB RAM
• 10 GB hard disk
The owner shall supply the following information to facilitate system implementation:
• IP addresses and subnet masks and other information as required to configure network devices
• Provide a person as the nominated system owner for administrator purposes
• Secure location for hardware and server
Critical Infrastructure System Vendor Responsibilities
The vendor shall provide hardware and software as listed.
•
•
•
•
•
Critical infrastructure software and licenses for server and workstation installations.
Provide Liebert Nform® Software Assurance for the first year at no additional cost.
Provide 7 x 24 system application and service support through a toll-free telephone number.
Provide warranty (parts and labor) per the manufacturer's warranty statement.
Vendor shall be ISO 9001 listed for design and manufacture of environmental control systems for
critical monitoring and control applications.
Liebert® PDX™ and Liebert PCW™
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Guide Specifications—Nominal 17, 18, 23 or 29kW Thermal Management System
2.28
LIEBERT vNSA™—OPTIONAL
The Liebert vNSA network switch is designed for connecting multiple Ethernet-ready devices. The
unit shall have one or two 8-port switches, providing a total of eight or 16 Ethernet ports. The Liebert
vNSA shall have 100-240VAC single phase for proper operation. A universal power supply (12V, 1.5A)
shall be installed inside a steel enclosure secured with a key lock, with a hard-wired connection for
120V or 230V operation. A Liebert iCOM® display shall be mounted on the front. Liebert iCOM shall
permit interconnecting Liebert PDX/PCW units to communicate through the use two CAT5 or better
network patch cables with RJ-45 connectors to connect devices to available ports.
The number of ports available for Ethernet-ready devices varies by the number of 8-port switches
included. The Liebert iCOM display use one port for connection to the Liebert iCOM display. The
16-port model shall use two ports to interconnect the switches.
# of Ports Needed to Connect
2.29
Model
Total
# Ports
To Liebert
iCOM Display
Upper and
Lower Switches
# Ports
Available
Maximum # Liebert PDX/PCW
that may be connected
vNSA8-iCOM
8
1
N/A
7
3
vNSA16-iCOM
16
1
2
13
6
LIEBERT LIQUI-TECT® 410 POINT LEAK DETECTION SENSOR FOR REMOTE
MOUNTING—OPTIONAL
A total of ________ (quantity) solid-state water sensor(s) with no moving parts and hermetically
sealed to keep out dust and dirt shall be provided. The Liebert Liqui-tect 410 (LT410) shall provide a
single-point detection of leaks. The point detection sensor shall have two gold-plated sensing probes to
prevent corrosion resistance and to provide accurate readings. The LT410 shall constantly monitor
points for leaks, internal faults and power failures and warn of any abnormal conditions. Mounting
brackets shall allow for sensor height adjustment and leveling. The LT410 shall provide two
independent outputs to signal both a local alarm panel and a remote building management system or
external equipment. The LT410 shall be rated for 24VAC, 50/60Hz and 0.10 amp.
2.30
LIEBERT LIQUI-TECT 460 ZONE LEAK DETECTION MODULE WITH CABLE KIT
FOR REMOTE MOUNTING—OPTIONAL
A total of ________ (quantity) zone water sensor cables with no moving parts and hermetically sealed
to keep out dust and dirt shall be provided. The Liebert Liqui-tect 460 (LT460) shall provide a zone
detection of leaks. The LT460 shall constantly monitor points for leaks, internal faults and power
failures and warn of any abnormal conditions. LED’s shall provide status indication and also ensure
the cable is properly installed and operational under raised floors. The LT460 shall provide two
independent outputs provide a signal to a local alarm panel, Liebert environmental unit, remote
building management system or external equipment.
Liebert Liqui-tect 460 Module
The LT460 shall consist of a metal enclosure with a hinged top door providing access to the internal
circuit board for wiring termination and configuration of DIP switches. The LT460 shall monitor up to
100 feet of connected LT500Y leak detection cable.
LT500Y Leak Detection Cable
The cable material and construction shall allow the cable to lie flat when used with hold-down clips.
The LT500Y shall be plenum-rated and UL-listed for safe operation. Cables shall be available in
lengths of 20, 25, 30, 35 and 45 feet.
The LT460 shall be rated for 24VAC, 50/60Hz and 0.12A.
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Liebert® PDX™ and Liebert PCW™
Guide Specifications—Nominal 17, 18, 23 or 29kW Thermal Management System
2.31
FLOOR STAND—OPTIONAL
2.31.1 Supply Air Floor Stand—Optional
Downflow Raised Floor (Upflow Not Rear Return)
The floor stand shall be constructed of galvanized steel. The floor stand shall have adjustable legs
with vibration isolation pads. The floor stand shall be: (6in. [15cm]). (9 in. [23cm]), (12 in. [30cm]), (15
in. [38cm]), (18 in. [46cm]), (21 in. [53cm]), (24 in. [61cm]) high.
2.31.2 RETURN AIR FLOOR STAND Assembly—Optional
The upflow unit with rear return air configuration shall be supplied with a skirted-floor stand
assembly. The floor stand assembly shall be constructed of galvanized steel with powder-coated
panels and supplied with air filter. The floor stand assembly shall be 24-1/8 in. (613mm) high and
have adjustable legs with vibration isolation pads. It shall provide a rear return duct flange and
removable panel for filter access.
2.32
PLENUM—OPTIONAL
2.32.1 Plenum Construction
The exterior panels shall be 20 gauge steel and powder-coated with black color paint to protect
against corrosion. The exterior panels are insulated with 1/2" to 1" (25.4mm), 1-1/2 lb. (0.68 kg)
insulation. Front and side panels shall have captive, quarter-turn fasteners.
2.32.1.1 Double-Skin Panels (Optional)
The exterior panels shall be internally lined with 20 gauge galvanized steel, sandwiching the
insulation between the panels for easy cleaning.
2.32.2 Air Flow Configuration
2.32.2.1 Ducted
The unit shall be supplied with a ducted air discharge plenum. The plenum shall be 18 in. (457mm),
24 in. (609mm), 30 in. (762mm), 36 in. (914mm), 42 in. (1066mm) or 48 in. (1219) with top duct
connection.
2.32.2.2 Two-Way Grille
The unit shall be supplied with a two-way air discharge plenum. The plenum shall be 18 in. (457mm)
high.
2.32.2.3 Three-Way Grille
The unit shall be supplied with a three-way air discharge plenum. The plenum shall be 18 in.
(457mm) high.
2.32.2.4 Four-Way Grille
The unit shall be supplied with a four-way air discharge plenum. The plenum shall be 18 in. (457mm)
high.
2.33
HEAT REJECTION
2.33.1 Liebert MC Condenser Summary
These specifications describe requirements for a Liebert air-cooled condenser for a Liebert Thermal
Management system. The condenser shall be designed to reject waste heat to outdoor air and to
control refrigerant head pressure as indoor equipment loading and outdoor ambient conditions
change.
The manufacturer shall design and furnish all equipment in the quantities and configurations shown
on the project drawings.
Standard 60Hz units shall be CSA-certified to the harmonized U.S. and Canadian product safety
standard CSA C22.2 No 236/UL 1995 for Heating and Cooling Equipment and shall be marked with
the CSA c-us logo.
Liebert® PDX™ and Liebert PCW™
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Guide Specifications—Nominal 17, 18, 23 or 29kW Thermal Management System
2.33.1.1 Liebert MC™ Design Requirements
The air-cooled condenser shall be a factory-assembled unit, complete with integral electrical panel,
designed for outdoor installation. The condenser shall be a draw-through design.
2.33.1.2 Liebert MC Standard Features
Condenser shall consist of microchannel condenser coil(s), propeller fan(s) direct-driven by individual
fan motor(s), electrical controls, housing and mounting legs. The Liebert air-cooled condenser shall
provide positive refrigerant head pressure control to the indoor cooling unit by adjusting heat
rejection capacity. Microchannel coils shall provide superior heat transfer, reduce air-side pressure
drop, increase energy efficiency and significantly reduce the system refrigerant volume required. EC
fans and fan operating techniques shall reduced sound levels. Various methods shall be available to
match indoor unit type, maximum outdoor design ambient and maximum sound requirements.
2.33.1.3 Liebert MC Condenser Coil
Liebert microchannel coils shall be constructed of aluminum microchannel tubes, fins and manifolds.
Tubes shall be flat and contain multiple, parallel flow microchannels and span between aluminum
headers. Full-depth louvered aluminum fins shall fill spaces between the tubes. Tubes, fins and
aluminum headers shall be oven-brazed to form a complete refrigerant-to-air heat exchanger coil.
Copper stub pipes shall be electric resistance-welded to aluminum coils and joints protected with
polyolefin to seal joints from corrosive environmental elements. Coil assemblies shall be factory
leak-tested at a minimum of 300 psig (2068kPag). Hot gas and liquid lines shall be copper and shall
be brazed using nitrogen gas flow to the stub pipes with spun-closed ends for customer piping
connections. Complete coil/piping assembly shall be then filled and sealed with an inert gas holding
charge for shipment.
Aluminum Microchannel Coil with E-Coat—Optional
Aluminum microchannel coil with E-coat shall provide a flexible epoxy coating to all coil surface areas
without material bridging between fins. E-coat shall increase coil corrosion protection and shall
reduce heat rejection capacity degradation to less than 10% after a severe 2000 hour 5% neutral salt
spray test (ref. ASTM B117). The coating process shall ensure complete coil encapsulation, and the
color shall be black.
2.33.1.4 Liebert MC Fan Motor/Blade Assembly
The fan motor/blade assembly shall have an external rotor motor, fan blades and fan/finger guard.
Fan blades shall be constructed of cast aluminum or glass-reinforced polymeric material. Fan guards
shall be heavy gauge, close-meshed steel wire, coated with a black corrosion resistant finish. Fan
terminal blocks shall be in an IP54 enclosure on the top of the fan motor. Fan assemblies shall be
factory-balanced, tested before shipment and mounted securely to the condenser structure.
Liebert MC Condenser EC Fan Motor
The EC fan motors shall be electronically commutated for variable speed operation and shall have
ball bearings. The EC fans shall provide internal overload protection through built-in electronics.
Each EC fan motor shall have a built-in controller and communication module, linked via RS485
communication wire to each fan and the Premium Control Board, allowing each fan to receive and
respond to precise fan speed inputs from the Premium Control Board.
Liebert MC Condenser AC Fan Motor—Optional
The AC fan/motor assembly shall be an integral assembly of a three-phase motor, quiet fan blade
assembly and finger/hail guard. Fan blades shall be constructed of stamped aluminum or steel
extrusion coated with polypropylene plastic. Fan guards shall be heavy gauge, close-meshed, steel
wire, coated with a black corrosion resistant finish. Fan terminal blocks shall be on the top of the fan
guard with IP54 protection class. Fans shall be factory-balanced and -tested before shipment.
The AC fan motors shall be for variable speed operation and shall have ball bearings. The AC fans
shall provide internal overload protection through a built-in thermal switch. The AC fan control board
shall provide electronic voltage regulation to the AC fans.
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Liebert® PDX™ and Liebert PCW™
Guide Specifications—Nominal 17, 18, 23 or 29kW Thermal Management System
2.33.1.5 Electrical Controls
Electrical controls and service connection terminals shall be provided and factory-wired inside the
attached control panel section. Only high-voltage supply wiring and low voltage indoor unit
communication/interlock wiring are required at condenser installation.
EC Fan Speed and Premium Control
The EC fan/Premium Control System shall include an electronic control board, EC fan motor(s) with
internal overload protection, refrigerant and ambient temperature thermistors and refrigerant
pressure transducers. The Premium Control Board shall communicate directly with the indoor unit’s
Liebert iCOM control via field-supplied CANbus communication wires and via field-supplied
low-voltage interlock wires. The control board shall use sensor and communication inputs to maintain
refrigerant pressure by controlling each EC fan on the same refrigerant circuit to the same speed. The
Premium control board shall be rated to a temperature of -30°F to 125°F. The premium control shall
be factory set for (fan speed) (fan speed with Liebert Lee-Temp™) control.
AC Fan Speed and Basic Control—Optional
The AC fan/Basic Control system shall include an electronic control board, AC fan motor(s) with
internal overload protection, refrigerant and ambient temperature thermistors and refrigerant
pressure transducers. The control board shall receive an indoor unit run signal via field-supplied
low-voltage interlock wires to the compressor side switch, field-supplied low-voltage interlock wires.
The control board shall use sensor and communication inputs to maintain refrigerant pressure by
controlling each AC fan on the same refrigerant circuit to the same speed. The Basic Control board
shall be rated to a temperature of -30°F to 125°F. The basic control shall be factory set for (fan speed)
(fan speed with Liebert Lee-Temp) control.
Locking Disconnect Switch
A Locking-Type disconnect switch shall be factory-mounted and wired to the electrical panel and be
capable of disrupting the flow of power to the unit and controlled via an externally mounted locking
and lockable door handle. The locking disconnect shall be lockable in support of lockout/tagout safety
programs.
Short Circuit Current Rating
The electrical panel shall provide at least 65,000A SCCR.
Cabinet
The condenser cabinet shall be constructed of bright aluminum sheet and divided into individual fan
sections by full width baffles. Internal structural support members, including coil support frame,
shall be galvanized steel for strength and corrosion resistance. Panel doors shall be provided on two
sides of each coil/fan section to permit coil cleaning. An electrical panel shall be contained inside a
factory-mounted NEMA 3R weatherproof electrical enclosure.
2.33.1.6 Mounting Legs Standard Aluminum Legs
Aluminum legs shall be provided to mount unit for vertical air discharge with rigging holes for
hoisting the unit into position. Standard height is 18 in. (457mm).
Optional Galvanized Steel Legs with Bracing
Condensers shall be shipped with (36in. [914mm]) (48in. [1219mm]) (60in. [1524mm]) mounting legs
with stabilization bracing. Legs, bracing and hardware shall be galvanized steel.
Liebert® PDX™ and Liebert PCW™
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Guide Specifications—Nominal 17, 18, 23 or 29kW Thermal Management System
2.33.1.7 Liebert MC™ Condenser Accessories
Liebert Lee-Temp™ System—Optional
Liebert Lee-Temp Receiver Kit shall contain an insulated, heated receiver tank with sight glasses,
mounting plate, mounting hardware, pressure relief valve, rotalock valve for refrigerant charge
isolation and piping assembly with head pressure operated three-way valve and check valve.
Components shall be field-assembled to the condenser. The three-way valve shall sense refrigerant
head pressure and adjust the flooding charge in the condenser coil to adjust the condenser heat
rejection capacity. The Liebert Lee-Temp heater shall be 150W, shall include an integral thermostat
to maintain refrigerant temperature at a minimum of 85°F (29°C) and shall require a separate power
supply of (208/230-1-60) (120-1-60V).
The Liebert Lee-Temp Kit shall function with Liebert MC variable speed fan motors and electronic
controls that lower fan speed in lower outdoor ambient temperatures for maximum energy efficiency.
This system shall allow system startup and positive head pressure control with ambient
temperatures as low as -30°F (-34.4°C).
2.33.1.8 Fusible Plug Kit—Optional
A fusible plug kit shall be field-installed on the liquid line for compliance with building codes
requiring refrigerant relief during high temperature and building fire conditions.
2.33.1.9 IBC/OSHPD Seismic Certification and IBC Wind/Snow Load Complaint—Optional
IBC/OSHPD Seismic Certification and IBC Wind/Snow Load Compliant condensers shall be provided
with any applicable bracing and field-installation instructions. Condensers shall bear a label
certifying compliance with IBC/OSHPD requirements.
2.34
LIEBERT DRYCOOLER
2.34.1 Liebert Drycooler Summary
These specifications describe requirements for a Liebert air-cooled drycooler for a Liebert Thermal
Management system. The drycooler shall be designed to reject waste heat to outdoor air and to control
glycol temperature as pumped glycol rates and outdoor ambient conditions change.
The manufacturer shall design and furnish all equipment in the quantities and configurations shown
on the project drawings.
Standard 60Hz units shall be CSA-certified to the harmonized U.S. and Canadian product safety
standard CSA C22.2 No 236/UL 1995 for Heating and Cooling Equipment and shall be marked with
the CSA c-us logo.
2.34.2 Liebert Design Requirements
The drycooler shall be a factory-assembled unit, complete with integral electrical panel, designed for
outdoor installation and vertical airflow only. The drycooler shall be a draw-through design.
2.34.3 Liebert Drycooler Standard Features-All Drycoolers
The drycooler shall consist of drycooler coil(s), housing, propeller fan(s) direct-driven by individual fan
motor(s), electrical controls and mounting legs. The Liebert air-cooled drycooler shall provide glycol
temperature control to the indoor cooling unit by adjusting heat rejection capacity. Various methods
shall be available to match indoor unit type, minimum outdoor design ambient and maximum sound
requirements
2.34.3.1 Liebert Drycooler Coil
The Liebert-manufactured coil shall be constructed of copper tubes in a staggered tube pattern. Tubes
shall be expanded into continuous, corrugated aluminum fins. The fins shall have full-depth fin
collars completely covering the copper tubes, which shall connected to heavy wall Type “L” headers.
Inlet coil connector tubes shall pass through relieved holes in the tube sheet for maximum resistance
to piping strain and vibration. Coil shall be split flow into multiple coil circuits, combined to yield a
drycooler with ______ internal circuits. The supply and return lines shall be (spun shut [1-4 fan
models]), (brazed with a cap [6 or 8-fan models]) and shall include a factory-installed Schrader valve.
Coils shall be factory leak-tested at a minimum of 300 psig (2068kPag), dehydrated, then filled and
sealed with an inert gas holding charge for shipment. Field relief of the Schrader valve shall indicate
a leak-free coil.
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Liebert® PDX™ and Liebert PCW™
Guide Specifications—Nominal 17, 18, 23 or 29kW Thermal Management System
2.34.3.2 Housing
The drycooler housing shall be constructed of bright aluminum sheet and divided into individual fan
sections by full-width baffles. Structural support members, including coil support frame, motor and
drive support, shall be galvanized steel for strength and corrosion resistance. Aluminum legs shall be
provided to mount unit for vertical air discharge and shall have rigging holes for hoisting the unit into
position. An electrical panel shall be inside an integral NEMA 3R weatherproof section of the
housing.
2.34.3.3 Propeller Fan
The propeller fan shall have aluminum blades secured to a corrosion protected steel hub. Fans shall
be secured to the fan motor shaft by means of a keyed hub and dual setscrews. Fan diameter shall be
26" (660mm) or less. Fans shall be factory-balanced and run before shipment. Fan guards shall be
heavy gauge, close-mesh steel wire with corrosion resistant PVC finish that shall be rated to pass a
675-hour salt spray test.
2.34.3.4 Fan Motor
The fan motor shall be continuous air-over design and shall be equipped with a rain shield and
permanently sealed bearing. Motors shall be rigidly mounted on die-formed galvanized steel supports.
2.34.3.5 Electrical Controls
Electrical controls, overload protection devices and service connection terminals shall be provided and
factory-wired inside the integral electrical panel section of the housing. A locking disconnect switch
shall be factory-mounted and wired to the electrical panel and controlled via an externally mounted
locking door handle. An indoor unit interlock circuit shall enable drycooler operation whenever indoor
unit compressors are active. Only supply wiring, indoor unit interlock wiring and high voltage wiring
to pumps when controlled by the drycooler shall be required at drycooler installation.
2.34.4 Specific Features by Drycooler Type
2.34.4.1 Fan Speed Control (DSF/DDF) Drycooler (1 Fan) with Integral Pump Control
The DSF/DDF drycooler shall have a fan speed controller that senses the leaving glycol temperature
and varying the speed of a FSC duty motor in direct proportion to the heat rejection needs of the
system. Fan speed controller shall be factory set to range of 70 to 100°F (21 to 38°C) for glycol-cooled
applications. The fan speed control shall be field adjustable to a range of 30 to 60°F (2 to 7°C) for freecooling applications. The motor shall be single-phase and include built-in overload protection. The
motor shall have an ODP enclosure. The DSF/DDF drycooler shall control operation of glycol pumps
powered from the electrical panel. The air-cooled drycooler shall have a ____ volt, 1 ph, ____ Hz power
supply.
2.34.4.2 Fan Cycling Control (DSO, DDO) Drycooler (All Fan Quantities) with Integral Pump
Control
The DSO/DDO/(D)DNT drycooler shall sense the leaving glycol temperature and cycle fixed speed
fans to maintain glycol temperatures. Aquastats shall have field-adjustable set-points. The fixed
speed motors shall be three-phase and have individual internal overload protection. Fixed speed
motors shall have a TEAO enclosure. The DSO/DDO drycooler shall control operation of glycol pumps
powered from the electrical panel. The air-cooled drycooler shall have a ____ volt, 3 ph, ____ Hz power
supply.
2.34.4.3 Fan Cycling Control (DDNT/DNT) Drycooler (All Fan Quantities)
The DDNT/DNT drycooler shall sense the leaving glycol temperature and cycle fixed-speed fans to
maintain glycol temperatures. Aquastats shall have field-adjustable setpoints. The fixed-speed
motors shall be three-phase and have individual internal overload protection. Fixed-speed motors
shall have a TEAO enclosure. The air-cooled drycooler shall have a ____ volt, 3 ph, ____ Hz power
supply.
Liebert® PDX™ and Liebert PCW™
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Guide Specifications—Nominal 17, 18, 23 or 29kW Thermal Management System
2.34.4.4 Main Fan Control ((D)DNL) Drycoolers (All Fan Quantities)
The DDNL/DNL drycooler shall control fixed-speed fans when an external contact closure completes
the internal 24VAC circuit. The fixed-speed motors shall be three-phase and have individual internal
overload protection. Fixed-speed motors shall have a TEAO enclosure. The air-cooled drycooler shall
have a ____ volt, 3 ph, ____ Hz power supply.
2.34.4.5 No Fan Control ((D)DNC) Drycoolers (All Fan Quantities)
The DDNC/DNC drycooler shall activate all fixed-speed fans when supply power is applied to the
drycooler. The fixed-speed motors shall be three-phase and have individual internal overload
protection. Fixed-speed motors shall have a TEAO enclosure. The air-cooled drycooler shall have a
____ volt, 3 ph, ____ Hz power supply.
2.34.4.6 Liebert Quiet-Line™ Drycoolers (All Fan Quantities)
Liebert Quiet-Line drycoolers shall be available for DSO, DDO, (D)DNT, (D)DNL and (D)DNC control
types. The fan motor(s) shall have a TEAO enclosure and provide individual overload protection for
quiet operation.
2.34.5 Pump Controls
2.34.5.1 Single Pump Option
Pump controls for a single glycol pump up to 7.5 hp shall be incorporated into the same integral
electrical panel as the drycooler fan controls and may include fuses or circuit breakers as required for
the pump motor. Pump voltage, phase and frequency shall be same as drycooler voltage, phase and
frequency.
2.34.5.2 Dual Pump Option
Pump controls for a dual glycol pump system shall operate one pump as primary and the second
pump shall operate as a standby pump. Pump controls shall be incorporated into the same integral
electrical panel controlling drycooler fans. A field-supplied flow switch shall sense loss of flow and
switch to the standby pump for continuous system operation. An internal switch shall allow manual
selection of the primary (lead) pump.
2.34.5.3 Pump Package
Single Pump Package
This system shall be provided with a centrifugal pump mounted in a weatherproof and vented
enclosure. The pump shall be rated for ___ GPM (___ l/m) at ___ ft. (___ kPa) of head and operate on
___ volt, 3-phase, ___ Hz.
Dual Pump Package
The dual pump package shall include pumps, enclosure, and field-mounted flow switch. The standby
pump shall automatically start up on failure of the lead pump by drycooler pump controls or by a
separate factory-wired control box and shall include a lead/ lag switch for the pumps. Each pump
shall be rated for _______ GPM (___ l/s) at ___ ft. (___ kPa) of head.
2.34.5.4 Ancillary Items
Expansion Tanks, Fluid Relief Valves, Air Management and Other Devices
An expansion tank shall be provided for expansion and contraction of the glycol fluid due to
temperature change in the closed system. The tank and air vents shall be field-installed at the
system's highest elevation to allow venting of trapped air. A fluid pressure relief valve shall be
provided for system safety. The system shall include (tank-steel [expansion, compression, diaphragm,
bladder], air separator, air vent, fluid pressure relief valve, pressure gauges, flow switches, tempering
valves, [primary, primary and standby] pumps, supply and return piping).
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Liebert® PDX™ and Liebert PCW™
Guide Specifications—Nominal 17, 18, 23 or 29kW Thermal Management System
3.0
EXECUTION
3.1
INSTALLATION OF PRECISION COOLING UNITS
3.1.1
General
Install precision cooling units in accordance with manufacturer's installation instructions. Install
units plumb and level, firmly anchored in locations indicated, and maintain manufacturer's
recommended clearances.
3.1.2
Electrical Wiring
Install and connect electrical devices furnished by manufacturer but not specified to be factory
mounted. Furnish copy of manufacturer's electrical connection diagram submittal to electrical
contractor.
3.1.3
Piping Connections
Install and connect devices furnished by manufacturer but not specified to be factory-mounted.
Furnish copy of manufacturer's piping connection diagram submittal to piping contractor.
3.2
FIELD QUALITY CONTROL
Start up the system in accordance with manufacturer's startup instructions. Test controls and
demonstrate compliance with requirements. These specifications describe requirements for a
computer room environmental control system. The system shall be designed to maintain temperature
and humidity conditions in the rooms containing electronic equipment.
The manufacturer shall design and furnish all equipment to be fully compatible with heat dissipation
requirements.
3.2.1
Supply and Drain Water Piping
Connect water supply and drains to air conditioning unit. Provide pitch and trap as manufacturer's
instructions and local codes require.
3.3
SEISMIC IBC/OSHPD (OPTIONAL)
Install the condenser in accordance with manufacturer's installation instructions provided with
seismic option. Firmly anchor maintaining manufacturer's recommended clearances. Mounting
requirement details such as anchor brand, type, embedment depth, edge spacing, anchor-to-anchor
spacing, concrete strength, special inspection and attachment to non-building structures must be
outlined and approved by the Engineer of Record for the projection or building. Electrical, pipe, and
duct connections must permit movement in three dimensions and isolate the unit from field
connections. Electrical conduit shall be flexible having at least one bend between the rigid connection
at the unit cabinet and the connection to rigid conduit or foundation. The piping flexible connection or
loop must be suitable for the operation pressure and temperature of the system. Furnish copy of
manufacturer's piping connection diagram submittal to piping contractor.
Liebert® PDX™ and Liebert PCW™
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Guide Specifications—Nominal 17, 18, 23 or 29kW Thermal Management System
Notes
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Liebert® PDX™ and Liebert PCW™
Guide Specifications—Nominal 17, 18, 23 or 29kW Thermal Management System
Liebert® PDX™ and Liebert PCW™
94
Technical Support / Service
Web Site
www.liebert.com
Monitoring
liebert.monitoring@emerson.com
800-222-5877
Outside North America: +00800 1155 4499
Single-Phase UPS & Server Cabinets
liebert.upstech@emerson.com
800-222-5877
Outside North America: +00800 1155 4499
Three-Phase UPS & Power Systems
800-543-2378
Outside North America: 614-841-6598
Environmental Systems
800-543-2778
Outside the United States: 614-888-0246
Locations
While every precaution has been taken to ensure the accuracy
and completeness of this literature, Liebert Corporation assumes no
responsibility and disclaims all liability for damages resulting from use of
this information or for any errors or omissions.
© 2014 Liebert Corporation
All rights reserved throughout the world. Specifications subject to change
without notice.
® Liebert is a registered trademark of Liebert Corporation.
All names referred to are trademarks
or registered trademarks of their respective owners.
SL-19810_REV0_04-15
Emerson Network Power
Liebert
www.emerson.com
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