Installation and Maintenance Manual
IMM 1157-1
Group: Chiller
Part Number: 331373601
Effective: September 2014
Supercedes: March 2012
Water-Cooled Screw Compressor Chillers
WGS 130AW to WGS 190AW, Packaged Water-Cooled Chiller
WGS 130AA to WGS 190AA, Chiller with Remote Condenser
120 to 200 Tons, 420 to 700 kW
R-134A, 60 Hz
Table of Contents
Introduction ....................................... 3
Electrical Data ................................. 30
General Description ..................................... 3
Nomenclature ............................................... 3
Inspection..................................................... 3
Wiring Diagrams ........................................ 38
Control Panel Layout ................................. 46
Installation ......................................... 4
Vibration Isolators ....................................... 6
Sequence of Operation .................... 49
Start-Up and Shutdown .................. 50
Flow Switch ............................................... 12
Glycol Solutions ........................................ 13
Condenser Water Piping ............................ 14
Water Pressure Drop .................................. 15
Pre Start-up ................................................ 50
Start-up....................................................... 50
Weekend or Temporary Shutdown ............. 51
Start-up after Temporary Shutdown ........... 51
Extended Shutdown ................................... 51
Start-up after Extended Shutdown ............. 51
Refrigerant Piping ........................... 18
System Maintenance ....................... 52
Unit with Remote Condenser ..................... 18
Factory-Mounted Condenser ..................... 21
General ....................................................... 52
Electrical Terminals ................................... 53
POE Lubrication ........................................ 53
Sight Glass and Moisture Indicator ............ 54
Sump Heaters ............................................. 54
Water Piping .................................... 10
Dimensional Data ............................ 22
Physical Data.................................... 25
WGS-AW, Water-Cooled ........................... 25
WGS-AA Remote Condenser .................... 26
Unit Configuration .......................... 27
Components ............................................... 27
Maintenance Schedule .................... 55
System Service ................................. 56
Troubleshooting Chart ............................... 58
Wiring ............................................... 28
BAS Interface ............................................ 29
Remote Operator Interface Panel ............... 29
Unit controllers are LONMARK certified with an optional LONWORKS communications module.
Manufactured in an ISO Certified Facility
©2014 Daikin Applied. Illustrations and data cover the Daikin Applied product at the time of publication and we reserve the right to make changes
in design and construction at any time without notice.
2
WGS 130A to WGS 190A
IMM 1157
Introduction
General Description
Daikin Model WGS water chillers are designed for indoor installations and are available with factorymounted water-cooled condensers (Model WGS AW), or arranged for use with remote air-cooled or
evaporative condensers (Model WGS AA). Each water-cooled unit is completely assembled and factory
wired before evacuation, charging and testing. They consist of two semi-hermetic rotary screw compressors,
a two-circuit shell-and-tube evaporator, two shell-and-tube water-cooled condensers (WGS-AW), and
complete refrigerant piping.
Units manufactured for use with remote condensers (Models WGS-AA) have all refrigerant specialties
factory-mounted and connection points for refrigerant discharge and liquid lines.
Liquid line components are manual liquid line shutoff valves, charging valves, filter-driers, liquid line
solenoid valves, sight glass/moisture indicators, and electronic expansion valves.
The electrical control center includes a MicroTech II microprocessor control system and equipment
protection and operating controls necessary for dependable, automatic operation.
The compressor circuits are equipped with individual compressor isolation circuit breakers on single point
power connection options. A unit disconnect switch is available as an option over the standard power block.
Nomenclature
W G S 130 A W
Water-Cooled Condensing
W = Water-Cooled Condenser
A = Unit Less Condenser
Global
Design Vintage
Rotary Screw Compressor
Nominal Capacity (Tons)
Inspection
When the equipment is received, carefully check all items against the bill of lading to be sure of a complete
shipment. Carefully inspect all units for damage upon arrival. All shipping damage must be reported to the
carrier and a claim must be filed with the carrier. Check the unit serial plate before unloading the unit to be
sure that it agrees with the power supply available. Physical damage to unit after acceptance is not the
responsibility of Daikin Applied.
Note: Unit shipping and operating weights are given in the physical data tables beginning on page
25.
IMM1157-1
WGS 130A to 190A
3
Installation
WARNING
Installation and maintenance are to be performed only by qualified personnel who are familiar with local codes and
regulations, and experienced with this type of equipment. Avoid contact with sharp edges. Personal injury can result.
Start-up by Daikin Applied is included on all units sold for installation within the USA and Canada and must be
performed by them to initiate the standard limited product warranty. Two-week prior notification of start-up is
required. The contractor should obtain a copy of the Start-up Scheduled Request Form from the sales
representative or from the nearest Daikin Applied service office.
Handling
Every model WGS-AW water chiller with water-cooled condensers is shipped with a full refrigerant charge. For
shipment, the charge is contained in the condensers and is isolated by the condenser liquid shutoff valves and
the compressor discharge valves.
A nitrogen/helium holding charge is applied to remote condenser models to maintain a slight positive system
pressure. After installation, the unit must be leak-tested, vacuumed, and charged with the operating charge of
refrigerant. The operating charge is field-supplied and charged on remote condenser models.
WARNING
Escaping refrigerant can displace air and cause suffocation. Immediately evacuate and ventilate the equipment area. If the
unit is damaged, follow Environmental Protection Agency (EPA) requirements. Do not expose sparks, arcing equipment,
open flame or other ignition source to the refrigerant.
Moving the Unit
If optional factory-installed skids are not used, some means such as dollies or skids must be used to protect the
unit from damage and to permit easy handling and moving.
Figure 1, Lifting the Unit
Remote Condenser Chiller
Water-Cooled Chiller
48.0
(1219.2)
48.0
(1219.2)
108.0
(2743.2)
84.0
(2133.6)
62.0
(1574.8)
62.0
(1574.8)
WGS 130-190 PACKAGE
WGS LESS CONDENSER
LIFT ONLY WITH HOLES
PROVIDED IN BASE
R3306437 01 B0200
Notes:
1.
You must use lifting halo or "I" spreader equal to the dimensions shown.
2.
Each lifting cable alone must be strong enough to lift chiller.
3.
Perform all moving and handling with skids or dollies under the unit when possible, and do not remove
them until the unit is in the final location. (continued next page)
4
WGS 130A to 190A
IMM1157-1
4.
5.
In moving, always apply pressure to the base on the skids only and not to the piping or other
components. A long bar will help move the unit. Do not drop the unit at the end of the roll.
Do not attach slings to piping or equipment. Do not attempt to lift the unit by lifting points mounted on
the compressors. They are for lifting only the compressor should one need to be removed from the unit.
Move unit in the upright horizontal position at all times. Set unit down gently when lowering from the
truck or rollers.
Table 1, Lifting Loads
WGS
Model
130A
140A
160A
170A
190A
AW, Package Units, lbs. (kg)
AA, Less Condenser Units, lbs (kg)
Shipping
Weight
RF
RB
LF
LB
2276
(1032)
2276
(1032)
2368
(1074)
2471
(1096)
2471
(1096)
1699
(770)
1699
(770)
1794
(813)
1813
(822)
1813
(822)
2213
(1003)
2213
(1003)
2300
(1042)
2350
(1065)
2350
(1065)
1651
(749)
1651
(749)
1742
(790)
1763
(799)
1763
(799)
7840 (3556)
7840 (3556)
8206 (3722)
8345 (3785)
8345 (3785)
RF
RB
LF
LB
1428
(647)
1428
(647)
1515
(687)
1515
(687)
1515
(687)
1444
(655)
1444
(655)
1543
(700)
1543
(700)
1543
(700)
1386
(629)
1386
(629)
1470
(667)
1470
(667)
1470
(667)
1402
(636)
1402
(636)
1496
(679)
1496
(679)
1496
(679)
Shipping
Weight
5659 (2567)
5659 (2567)
6024 (2732)
6024 (2732)
6024 (2732)
NOTES:
1.
RF=right front, RB=right back, LB=left back, LF=left front, when view from the control panel. See Figure 2 on page 6.
2.
The optional sound enclosure adds 650 lbs (295 kg) to the lifting weight, evenly distributed.
Location
WGS chillers are designed for indoor application and must be located in an area where the surrounding ambient
temperature is 40°F to 122°F (4.4°C to 50°C).
Because of the NEMA 1 electrical control enclosures, do not expose the units to the weather. A plastic cover
over the control box is supplied as temporary protection during shipment. A reasonably level and sufficiently
strong floor is required for the water chiller. If necessary, provide additional structural members to transfer the
weight of the unit to the nearest beams.
Note: Unit shipping and corner weights are given in Table 1. Operating weights are in the physical
data tables beginning on page 25.
Space Requirements for Connections and Servicing
The chilled water piping enters and leaves the unit from the right side when looking at the front of the unit
(control panel end). Left-hand connections are available as an option. Condenser water connections are located
at the rear of the unit, opposite the control panel. Provide clearance of at least 4 feet (1625 mm), or more if
codes require in front of the panel. Three feet (1219 mm) clearance should be provided on all other sides and
ends of the unit for general servicing. The National Electric Code (NEC) may require additional clearance in
front of the control panel and should be consulted.
On units equipped with a water-cooled condenser (Type WGS-AW), also provide clearance for cleaning or
removal of condenser tubes on one end of the unit. The clearance for cleaning depends on the type of apparatus
used, but can be as much as the length of the condenser (10 feet, 3050 mm). Tube replacement requires the tube
length of condenser plus one to two feet of workspace. This space can often be provided through a doorway or
other aperture.
Placing the Unit
The small amount of vibration normally encountered with the water chiller makes this unit particularly desirable
for basement or ground floor installations where the unit can be mounted directly to the floor. The floor
construction should be such that the unit will not affect the building structure, or transmit noise and vibration
into the structure.
IMM1157-1
WGS 130A to 190A
5
Vibration Isolators
It is recommended that isolators be used on all upper level installations or in areas where vibration
transmission is a consideration.
Figure 2, Isolator Locations
3 LF
LB
Control
Panel
End
1
Transfer the unit as indicated under
“Moving the Unit.” on page 4. In all
cases, set the unit in place and level
with a spirit level. When springtype isolators are required, install
springs running under the main unit
supports.
4
Condenser
Connections
RF
FRB 2
The unit should be set initially on shims or blocks at the listed spring free height. When all piping,
wiring, flushing, charging, etc., is completed, the springs are adjusted upward to loosen the blocks or
shims, which are then removed.
Use a rubber anti-skid pad under isolators if hold-down bolts are not used.
Installation of spring isolators requires flexible piping connections and at least three feet of flexible
electrical conduit to avoid straining the piping and transmitting vibration and noise.
NOTE: All spring isolators have four, same color springs per housing.
Table 2, Weights & Vibration Isolators, Packaged Unit, w/o Sound Enclosure
ARRANGEMENT WGS-AW, WITH WATER-COOLED CONDENSERS, WITHOUT SOUND ENCLOSURE
UNIT
SIZE
CORNER WEIGHT LBS
OPR.
(KG)
WT.
Lbs. (kg) 1
2
3
4
SPRING-FLEX MOUNTINGS
1
2
3
RUBBER-IN-SHEAR MOUNTINGS
4
1
2
3
4
8557
130AW
(3881)
1778 2556 1732 2491 1D-2040 1D-3600 1D-2040
(806) (1159) (786) (1130) Black
Green
Black
RP-4
RP-4
RP-4
1D-3600
Green Brick Red Lime Brick Red
RP-4
8557
140AW
(3881)
1778 2556 1732 2491 1D-2040 1D-3600 1D-2040
(806) (1159) (786) (1130) Black
Green
Black
RP-4
RP-4
RP-4
1D-3600
Green Brick Red Lime Brick Red
RP-4
Lime
9314
(4225)
1910 2805 1863 2736 1D-2700 1D-3600 1D-2700
(866) (1272) (845) (1241) Purple
Green
Purple
RP-4
9505
170AW
(4311)
1959 2852 1911 2783 1D-2700 1D-3600 1D-2700
(889) (1294) (867) (1262) Purple
Green
Purple
9505
(4309)
1959 2852 1911 2783 1D-2700 1D-3600 1D-2700
(889) (1294) (867) (1262) Purple
Green
Purple
RP-4
RP-4
RP-4
1D-3600
Green Brick Red Lime Brick Red
RP-4
RP-4
RP-4
1D-3600
Green Brick Red Lime Brick Red
RP-4
RP-4
RP-4
1D-3600
Green Brick Red Lime Brick Red
160AW
190AW
Lime
Lime
RP-4
Lime
RP-4
Lime
NOTE: ID 2040, ID 2700 and ID 3600 have four same color springs per housing.
6
WGS 130A to 190A
IMM1157-1
Table 3, Weights & Vibration Isolators, Packaged Unit, w/ Sound Enclosure
ARRANGEMENT WGS-AW, WITH WATER-COOLED CONDENSERS, WITH SOUND ENCLOSURE
UNIT OPR. WT.
SIZE Lbs. (kg)
130AW
140AW
160AW
170AW
190AW
CORNER WEIGHT LBS
(KG)
1
2
3
4
SPRING-FLEX MOUNTINGS
1
2
3
RUBBER-IN-SHEAR MOUNTINGS
4
1
2
3
4
9205
4179
1928
875
2730
1239
RP-4
1882 2665 1D-2700 1D-3600 1D-2700 1D-3600
854 1210 Purple
Green
Purple
Green Brick Red
RP-4
RP-4
RP-4
Lime
Brick
Red
Lime
9205
4179
1928
875
2730
1239
1882 2665 1D-2700
854 1210 Purple
RP-4
1D-3600 1D-2700 1D-3600
Green
Purple
Green Brick Red
RP-4
RP-4
RP-4
Lime
Brick
Red
Lime
9962
4523
2060
935
2979
1352
2013 2910 1D-2700
914 1321 Purple
1D-3600 1D-2700 1D-3600
Green
Purple
Green
RP-4
RP-4
RP-4
RP-4
Lime
Charcoal
Lime
Charcoal
10153
4609
2109
957
3026
1374
2061 2957 1D-2700
936 1342 Purple
1D-3600 1D-2700 1D-3600
Green
Purple
Green
RP-4
RP-4
RP-4
RP-4
Lime
Charcoal
Lime
Charcoal
10153
4609
2109
957
3026
1374
2061 2957 1D-2700
936 1342 Purple
1D-2700 1D-2700 1D-2700
Green
Purple
Green
RP-4
RP-4
RP-4
RP-4
Lime
Charcoal
Lime
Charcoal
NOTE: ID 2700 and ID 3600 have four same-color springs per housing.
Table 4, Weights & Vibration Isolators, Remote Condenser, Without Sound Enclosure
ARRANGEMENT WGS-AA, FOR REMOTE CONDENSER, WITHOUT SOUND ENCLOSURE (SEE NOTE)
SPRING-FLEX MOUNTINGS
RUBBER-IN-SHEAR MOUNTINGS
UNIT OPR. WT. CORNER WEIGHT LBS (KG)
SIZE LBS. (KG)
1
2
3
4
1
2
3
4
1
2
3
4
RP-4
RP-4
RP-4
RP-4
6265
1572
1603 1530 1560 1D-2040 1D-2040 1D-2040 1D-2040
130AA
Brick
Brick
Brick
Brick
(2842)
(713)
(727) (694) (708)
Black
Black
Black
Black
Red
Red
Red
Red
RP-4
RP-4
RP-4
RP-4
6265
1572
1603 1530 1560 1D-2040 1D-2040 1D-2040 1D-2040
140AA
Brick
Brick
Brick
(2842)
(713)
(727) (694) (708)
Black
Black
Black
Black
Brick Red
Red
Red
Red
RP-4
RP-4
RP-4
RP-4
7022
1752
1800 1708 1758 1D-2040 1D-2040 1D-2040 1D-2040
160AA
Brick
Brick
Brick
(3185)
(794)
(818) (775) (797)
Black
Black
Black
Black
Brick Red
Red
Red
Red
RP-4
RP-4
RP-4
RP-4
7022
1752
1800 1708 1758 1D-2040 1D-2040 1D-2040 1D-2040
170AA
Brick
Brick
Brick
(3185)
(794)
(818) (775) (797)
Black
Black
Black
Black
Brick Red
Red
Red
Red
RP-4
RP-4
RP-4
RP-4
7022
1752
1800 1708 1758 1D-2040 1D-2040 1D-2040 1D-2040
190AA
Brick
Brick
Brick
(3185)
(794)
(818) (775) (797)
Black
Black
Black
Black
Brick Red
Red
Red
Red
NOTE: ID 2040 has four same-color springs per housing.
Table 5, Weights & Vibration Isolators, Remote Condenser, With Sound Enclosure
UNIT
SIZE
130AA
140AA
160AA
170AA
190AA
ARRANGEMENT WGS-AA, FOR REMOTE CONDENSER, WITH SOUND ENCLOSURE (SEE NOTE)
CORNER WGT
RUBBER-IN-SHEAR
OPR. WT.
SPRING-FLEX MOUNTINGS
LBS (KG)
MOUNTINGS
LBS.
(KG)
1
2
3
4
1
2
3
4
1
2
3
4
RP-4
RP-4
RP-4
RP-4
6913
1722 1777 1680 1734 1D-2040 1D-2040 1D-2040 1D-2040
Brick
Brick
Brick
Brick
3139
782 807 763 787
Black
Black
Black
Black
Red
Red
Red
Red
RP-4
RP-4
RP-4
RP-4
6913
1722 1777 1680 1734 1D-2040 1D-2040 1D-2040 1D-2040
Brick
Brick
Brick
Brick
3139
782 807 763 787
Black
Black
Black
Black
Red
Red
Red
Red
RP-4
RP-4
RP-4
RP-4
7666
1902 1974 1858 1932 1D-2040 1D-2040 1D-2040 1D-2040
Brick
Brick
Brick
Brick
3480
864 896 844 877
Black
Black
Black
Black
Red
Red
Red
Red
RP-4
RP-4
RP-4
RP-4
7666
1902 1974 1858 1932 1D-2040 1D-2040 1D-2040 1D-2040
Brick
Brick
Brick
Brick
3480
864 896 844 877
Black
Black
Black
Black
Red
Red
Red
Red
RP-4
RP-4
RP-4
RP-4
7666
1902 1974 1858 1932 1D-2040 1D-2040 1D-2040 1D-2040 Brick
Brick
Brick
Brick
3480
864 896 844 877
Black
Black
Black
Black
Red
Red
Red
Red
NOTE: ID 2040 has four same color springs per housing.
IMM1157-1
WGS 130A to 190A
7
Table 6, Isolator Kit Part Numbers
Model AW, w/o
Sound Enclosure
WGS 130AW
WGS 140AW
WGS 160AW
WGS 170AW
WGS 190AW
Spring Part Number
332320601
332320601
332320602
332320602
332320602
R-I-S Part Number
332325601
332325601
332325601
332325601
332325601
Model AW, w Sound
Enclosure
WGS 130AW
WGS 140AW
WGS 160AW
WGS 170AW
WGS 190AW
Spring Part Number
332320602
332320602
332320602
332320602
332320602
R-I-S Part Number
332325601
332325601
332325602
33232562
332325602
Model AA, w/o
Sound Enclosure
WGS 130AA
WGS 140AA
WGS 160AA
WGS 170AA
WGS 190AA
Spring Part Number
332320603
332320603
332320603
332320603
332320603
R-I-S Part Number
332325603
332325603
332325603
332325603
332325603
Model AA, w/ Sound
Enclosure
WGS 130AA
WGS 140AA
WGS 160AA
WGS 170AA
WGS 190AA
Spring Part Number
332320603
332320603
332320603
332320603
332320603
R-I-S Part Number
332325603
332325603
332325603
332325603
332325603
NOTE: Model AW = packaged, water-cooled, Model AA = remote condenser, air-cooled
Figure 3, CP-4, Spring Flex Mounting
Figure 4, RP-4, R-I-S Mounting
6.25
5.00
3.75
3.00
ø .500-13NC-2B
R4
VM&C
.56 TYP.
VM&C
4.63
3.87
R.28
TYP.
R4
R.250 TYP.
RECESSED
GRIP RIBS
DURULENE
MATERIAL
R.750 TYP.
1.13 ± .25
APPROX.
1.63
.38
NOTES:
1.
MOUNT MATERIAL TO BE DURULENE RUBBER.
2.
MOLDED STEEL AND ELASTOMER MOUNT FOR
OUTDOOR SERVICE CONDITIONS.
3.
8
WGS 130A to 190A
RAISED GRIP RIBS
DRAWING NUMBER 3314814
ALL DIMENSIONS ARE IN DECIMAL INCHES
RP-4 MOUNT VERSION WITH STUD IN PLACE.
IMM1157-1
Figure 5, WGS-AA, Remote Condenser Configuration
Discharge
Connections
Liquid Return
Connections
IMM1157-1
WGS 130A to 190A
9
Water Piping
Vessel Drains at Start-up
Evaporators are drained of water in the factory and shipped with an open ball valve in the
drain hole. The drain is located on the bottom of the vessel. Be sure to close the valve prior
to filling the vessel with fluid.
Condensers: Units are drained of water in the factory and are shipped with condenser drain
plugs in the heads removed and stored in a bag in the control panel. Be sure to replace plugs
prior to filling the vessel with fluid.
General
Due to the variety of piping practices, follow the recommendations of local authorities for
code compliance. They can supply the installer with the proper building and safety codes
required for a proper installation.
The piping should be designed with a minimum number of bends and changes in elevation
to keep system cost down and performance up. Other piping design considerations include:
1. All piping should be installed and supported to prevent the chiller connections from
bearing any strain or weight of the system piping.
2. Vibration eliminators to reduce vibration and noise transmission to the building.
3. Shutoff valves to isolate the unit from the piping system during unit servicing.
4. Manual or automatic air vent valves at the high points of the system. Drains should be
placed at the lowest points in the system.
5. Some means of maintaining adequate system water pressure (e.g., expansion tank or
regulating valve).
6. Temperature and pressure indicators located within 3 feet (0.9 meters) of the inlet and
outlet of the vessels to aid in unit servicing.
7. A strainer or some means of removing foreign matter from the water before it enters the
pump. It should be placed far enough upstream to prevent cavitation at the pump inlet
(consult pump manufacturer for recommendations). A strainer can prolong pump life
and help maintain system performance.
Important Note
A cleanable 20-mesh strainer must also be placed in the water line just prior to the
inlet of the evaporator. This will aid in preventing foreign material from entering the
unit and decreasing the performance of the evaporator.
8. If the unit is used as a replacement chiller on a previously existing piping system, flush
the system thoroughly prior to unit installation. Regular water analysis and chemical
water treatment on the evaporator and condenser are recommended immediately upon
equipment start-up.
9. In the event glycol is added to the water system as an afterthought for freeze protection,
recognize that the refrigerant suction pressure will be lower, cooling performance will
be less, and water side pressure drop will be higher. If the percentage of glycol is large,
or if propylene glycol is used instead of ethylene glycol, the added pressure drop and
loss of performance could be substantial. Reset the freezestat and low leaving water
alarm temperatures. The freezestat is factory set to default at 32°F (0°C). Reset the
freezestat setting to approximately 8° to 10°F (4.4° to 5.5°C) below the leaving chilled
water setpoint temperature. See the section titled “Glycol Solutions” on page 13 for
additional information concerning the use of glycol.
10
WGS 130A to 190A
IMM1157-1
10. Make a preliminary leak check of the water piping before filling the system.
!
WARNING
This unit contains POE lubricants that must not come into contact with any surface or
material that might be harmed by POE, including certain polymers (e.g. PVC/CPVC and
polycarbonate piping).
Note: A water flow switch or pressure differential switch must be mounted in the
evaporator outlet water line to signal that there is water flow before the unit will
start.
Figure 6, Typical Field Evaporator Water Piping
Water
Strainer
Vent
In
Valved
Pressure
Gauge
Vibration
Eliminator
Out
Drain
Flow
Gate
Valve
Flow
Protect All Field Piping
Against Freezing
Vibration Flow
Balancing Gate
Eliminator Switch
Valve Valve
NOTE: Water piping must be supported independently from the unit.
System Water Volume
All chilled water systems need adequate time to recognize a load change, respond to that
load change and stabilize, without undesirable short cycling of the compressors or loss of
control. In air conditioning systems, the potential for short cycling usually exists when the
building load falls below the minimum chiller plant capacity or on close-coupled systems
with very small water volumes.
Some of the things the designer should consider when looking at water volume are the
minimum cooling load, the minimum chiller plant capacity during the low load period and
the desired cycle time for the compressors.
Assuming that there are no sudden load changes and that the chiller plant has reasonable
turndown, a rule of thumb of “gallons of water volume equal to two to three times the
chilled water gpm flow rate” is often used.
A properly designed storage tank should be added if the system components do not provide
sufficient water volume.
Variable Chilled Water Flow
Reducing chilled water flow in proportion to load can reduce total system power
consumption. Certain restrictions apply to the amount and rate of flow change. The rate of
flow change should be a maximum of 10 percent of the change, per minute. Do not reduce
flow lower than the minimum flows listed in the pressure drop data on page 16.
Chilled Water Piping
The system water piping must be flushed thoroughly prior to making connections to the unit
evaporator. A perforated metal basket strainer with 0.125-inch perforation, 40% open area.
IMM1157-1
WGS 130A to 190A
11
must be installed in the return water line before the inlet to the chiller. Lay out the water
piping so the chilled water circulating pump discharges into the evaporator inlet.
The return water line must be piped to the evaporator inlet connection and the supply water
line must be piped to the evaporator outlet connection. If the evaporator water is piped in
the reverse direction, a substantial decrease in capacity and efficiency of the unit will be
experienced.
A flow switch must be installed in the horizontal piping of the supply (evaporator outlet)
water line to prove water flow before starting the unit.
Provide drain connections at all low points in the system to permit complete drainage. Air
vents should be located at the high points in the system to purge air out of the system. The
evaporator is equipped with vent and drain connections.
Install pressure gauges in the inlet and outlet water lines to the evaporator. Pressure drop
through the evaporator can be measured to determine water flow from the flow/pressure
drop curves on page 16. Vibration eliminators are recommended in both the supply and
return water lines.
Insulate chilled water piping to reduce heat loss and prevent condensation. Perform
complete unit and system leak tests prior to insulating the water piping. Insulation with a
vapor barrier is recommended. If the vessel is insulated, the vent and drain connections
must extend beyond the proposed insulation thickness for accessibility.
Flow Switch
Field Installed
A water flow switch must be mounted in the leaving evaporator and condenser water line to
prove adequate water flow before the unit can start. This will protect against slugging the
compressors on start-up. It also serves to shut down the unit in the event that water flow is
interrupted to guard against evaporator freeze-up.
A flow switch is available from Daikin Applied under part number 01750330. It is a
“paddle” type switch and adaptable to any pipe size from 1 in. (25 mm) to 6 in. (152 mm)
nominal. Certain flow rates are required to open the switch and are listed in Table 7. Switch
terminals Y and R should be made to panel terminals 60 and 67 (chilled water) and 60 and
76 (condenser water). There is also a set of normally closed contacts on the switch that
could be used for an indicator light or an alarm to indicate when a “no flow” condition
exists.
1. Apply pipe sealing compound to only the threads of the switch and screw unit into the
1-in. (25-mm) reducing tee. The flow arrow must be pointed in the correct direction.
2. Piping should provide a straight length before and after the flow switch of at least five
times the pipe diameter without any valves, elbows, or other flow restricting elements.
3. Trim the flow switch paddle if needed, to fit the pipe diameter. Make sure the paddle
does not hang up in the pipe.
!
CAUTION
Make sure the arrow on the side of the switch is pointed in the direction of flow. Connect
the flow switch according to the wiring diagram (see wiring diagram inside control box
door). Incorrect installation will cause improper operation and possible evaporator damage.
12
WGS 130A to 190A
IMM1157-1
Table 7, Flow Switch Flow Rates
Pipe Size
(NOTE !)
Min.
Adjst.
Max.
Adjst.
Flow
No
Flow
Flow
No
Flow
inch
mm
gpm
Lpm
gpm
Lpm
gpm
Lpm
gpm
Lpm
1 1/4
32 (2)
5.8
1.3
3.7
0.8
13.3
3.0
12.5
2.8
1 1/2
38 (2)
7.5
1.7
5.0
1.1
19.2
4.4
18.0
4.1
2
51
13.7
3.1
9.5
2.2
29.0
6.6
27.0
6.1
2 1/2
63 (3)
18.0
4.1
12.5
2.8
34.5
7.8
32.0
7.3
3
76
27.5
6.2
19.0
4.3
53.0
12.0
50.0
11.4
4
102 (4)
65.0
14.8
50.0
11.4
128.0
29.1
122.0
27.7
5
127 (4)
125.0
28.4
101.0
22.9
245.0
55.6
235.0
53.4
6
153 (4)
190.0
43.2
158.0
35.9
375.0
85.2
360.0
81.8
8
204 (5)
205.0
46.6
170.0
38.6
415.0
94.3
400.0
90.8
NOTES:
1. A segmented 3-inch paddle (1, 2, and 3 inches) is furnished mounted, plus a 6-inch paddle loose.
2. Flow rates for a 2-inch paddle trimmed to fit the pipe.
3. Flow rates for a 3-inch paddle trimmed to fit the pipe.
4. Flow rates for a 3-inch paddle.
5. Flow rates for a 6-inch paddle
Optional Factory-Mounted
The chiller may be equipped with the optional factory-mounted flow switch. The 24 Vac
powered flow sensors are a solid state alternative to mechanical switches for sensing the
acceptable flow rate of water. The flow sensors are extremely reliable with no moving parts
that can become stuck or break in the flow process. These compact units are constructed of
corrosion-resistant materials and 316 stainless steel parts and are factory-installed directly
through a ¼ inch NPT into the flow. No field adjustments are required.
The flow sensors operate on the calorimetric principle. The sensors use the cooling effect of
a flowing fluid to provide reliable flow rate detection of liquids over a very wide flow
range. The amount of thermal energy that is removed from the tip determines the local flow
rate and when it exceeds a setpoint it changes the output-state.
Glycol Solutions
When using a glycol solution, the chiller capacity, flow rate, evaporator pressure drop, and
chiller power input can be calculated using the following formulas. Refer to Table 8 for
ethylene glycol and Table 9 for propylene glycol.
Capacity, Capacity is reduced compared to that of plain water. To find the reduced value,
multiply the chiller’s capacity when using water by the capacity correction factor C to find
the chiller’s capacity when using glycol.
Flow, Multiply the water flow by the G correction factor to determine the glycol flow
required to give the same Delta-T as water.
To determine evaporator gpm (or T) knowing T (or gpm) and capacity:
Glycol GPM 
24 x Glycol Capacity
x Flow Correction G From Tables
T
For Metric Applications -- Determine evaporator lps (or T) knowing T (or lps) and kW:
Glycol Lps 
kW
x Flow Correction G from Tables
4.18 x T
Pressure Drop, To determine glycol pressure drop through the cooler, enter the water
pressure drop graph on page 16 at the actual glycol flow. Multiply the water pressure drop
found there by correction factor P to obtain corrected glycol pressure drop.
Power, To determine glycol system kW, multiply the water system kW by factor K.
IMM1157-1
WGS 130A to 190A
13
Test coolant with a clean, accurate, glycol solution hydrometer (similar to that found in
service stations) to determine the freezing point. Obtain percent glycol from the freezing
point found in Table 8. On glycol applications the supplier normally recommends that a
minimum of 25% solution by weight be used for protection against corrosion or the use of
additional inhibitors.
Note: The effect of glycol in the condenser is negligible. As glycol increases in
temperature, its characteristics have a tendency to mirror those of water. Therefore, for
selection purposes, there is no derate in capacity for glycol in the condenser.
Table 8, Ethylene Glycol
% Ethylene
Glycol
10
20
30
40
50
Freeze Point
°F
°C
26
-3.3
18
-7.8
7
-13.9
-7
-21.7
-28
-33.3
C Capacity
K Power
G Flow
P Pressure Drop
0.996
0.986
0.978
0.966
0.955
0.999
0.998
0.996
0.993
0.991
1.035
1.060
1.092
1.131
1.182
1.096
1.219
1.352
1.530
1.751
C Capacity
K Power
G Flow
P Pressure Drop
0.987
0.975
0.962
0.946
0.929
0.992
0.985
0.978
0.971
0.965
1.010
1.028
1.050
1.078
1.116
1.068
1.147
1.248
1.366
1.481
Table 9, Propylene Glycol
% Percent
Glycol
10
20
30
40
50
Freeze Point
°F
°C
26
-3
19
-7
9
-13
-5
-21
-27
-33
!
CAUTION
Do not use automotive grade antifreeze. Industrial grade glycols must be used. Automotive
antifreeze contains inhibitors, which cause plating on copper tubes. The type and handling
of glycol used must be consistent with local codes.
Condenser Water Piping
Arrange the condenser water so the water enters the condensers’ bottom connections or the
single bottom manifold connection if the optional manifold has been ordered. The
condenser water will discharge from the top condenser connections or the single top
connection of the optional manifold. Failing to arrange the condenser water as stated above
will negatively affect the capacity and efficiency.
Install pressure gauges in the inlet and outlet water lines to the condenser. Pressure drop
through the condenser should be measured to determine flow on the pressure drop/flow
curves on page 17. Vibration eliminators are recommended in both the supply and return
water lines.
Water-cooled condensers can be piped for use with cooling towers or well water. Cooling
tower applications should be made with consideration of freeze protection and scaling
problems. Contact the cooling tower manufacturer for equipment characteristics and
limitations for the specific application.
14
WGS 130A to 190A
IMM1157-1
Evaporator Leaving Water Temperature(F)
Head pressure control must be
provided if the entering condenser
water can fall below the curve
65
values displayed in the graph to
60
the right. The MicroTech II unit
controller can provide this
55
function, using entering condenser
50
water as the control point. The
45
control will work with or without
the optional condenser manifolds.
40
The water sensors are factory35
installed.
30
The controller setpoints have to be
50
60
70
80
90
adjusted for water control and
Condenser Entering Water Temperature(F)
certain output connections made to
the tower components. See the
operating manual OM WGS and the field wiring diagram in this manual for further details.
Condenser Water Sensors
Packaged WGS chillers are supplied with one ECWT sensor and one LCWT sensor. The
option the unit is ordered with will determine the sensor location requirements. Listed
below are the two possibilities.
WGS Ordered Without the Condenser Manifold:
If the unit is ordered without the condenser manifold option, the entering and leaving water
sensors will have to be field-installed in their respective condenser water piping, at a
common location. Since each WGS is supplied with an independent condenser vessel per
refrigerant circuit, the water temperature sensors must be installed in a location prior to the
water piping split on the entering water side and after the piping is rejoined on the leaving
water side. The sensors ship with the chiller, temporarily attached to the condenser vessel.
The sensors will be landed on the control panel end and provided with additional lead
length for field installation.
WGS Ordered With the Condenser Manifold:
If the unit is ordered with the condenser manifold option, both sensors will be factoryinstalled in the manifolds.
Water Pressure Drop
The vessel flow rates must fall between the minimum and maximum values shown on the
appropriate evaporator and condenser curves. Flow rates below the minimum values shown
will result in laminar flow that will reduce efficiency, cause erratic operation of the
electronic expansion valve and could cause low temperature cutoffs. On the other hand,
flow rates exceeding the maximum values shown can cause erosion in the evaporator and
condenser.
Measure the chilled water pressure drop through the evaporator at field-installed pressure
taps. It is important not to include valves or strainers in these readings.
IMM1157-1
WGS 130A to 190A
15
Figure 7, Evaporator Pressure Drop WGS 130 – WGS 190
WGS 130, 140
WGS 160, 170, 190
Minimum Flow
WGS
Model
Flow Rate
Nominal Flow
Pressure Drop
Flow Rate
Maximum Flow
Pressure Drop
Flow Rate
Pressure Drop
gpm
L/s
Ft.
kPa
gpm
L/s
Ft.
kPa
gpm
L/s
Ft.
kPa
130AW/AA
195
12.3
5.8
17.4
312
19.7
13.5
40.4
520
32.9
33.9
101.1
140AW/AA
211
13.4
6.7
20.0
338
21.4
15.6
46.6
563
35.6
39.0
116.5
160AW/AA
235
14.9
4.6
13.8
376
23.8
10.8
32.3
627
39.7
27.3
81.6
170AW/AA
254
16.1
5.3
15.9
407
25.8
12.5
37.3
678
42.9
31.6
94.2
190AW/AA
273
17.3
6.1
18.1
437
27.7
14.2
42.5
728
46.1
35.9
107.2
Note: Minimum, nominal, and maximum flows are at a 16F, 10F, and 6F chilled water temperature range respectively and at ARI tons.
16
WGS 130A to 190A
IMM1157-1
Figure 8, Condenser Pressure Drop WGS 130 – WGS 190
WGS 170, 190
with Manifold
WGS 130, 140, 160
with Manifold
WGS 170, 190
without Manifold
WGS 130, 140, 160
without Manifold
Pressure Drop Without Optional Condenser Manifold
WGS
Model
Minimum Flow
Flow Rate
Pressure Drop
gpm
L/s
Ft.
kPa
Nominal Flow
Flow Rate
Pressure Drop
gpm
L/s
Ft.
kPa
Maximum Flow
Flow Rate
Pressure Drop
gpm
L/s
Ft.
kPa
130AW
140AW
160AW
170AW
190AW
304
304
304
372
372
390
422
470
509
546
650
704
784
848
911
WGS
Model
Minimum Flow
Flow Rate
Pressure Drop
gpm
L/s
Ft.
kPa
Nominal Flow
Flow Rate
Pressure Drop
gpm
L/s
Ft.
kPa
Maximum Flow
Flow Rate
Pressure Drop
gpm
L/s
Ft.
kPa
130AW
140AW
160AW
170AW
190AW
304
304
304
372
372
390
422
470
509
546
650
704
784
848
911
19.2
19.2
19.2
23.5
23.5
4.1
4.1
4.1
4.3
4.3
12.2
12.2
12.2
12.8
12.8
24.7
26.7
29.8
32.2
34.6
6.5
7.4
9.0
7.9
9.0
19.3
22.2
26.9
23.7
26.9
41.1
44.5
49.6
53.7
57.6
16.0
18.5
22.4
19.8
22.5
47.9
55.1
66.8
59.1
67.1
Pressure Drop With Optional Condenser Manifold
IMM1157-1
19.2
19.2
19.2
23.5
23.5
4.7
4.7
4.7
5.3
5.3
14.0
14.0
14.0
15.8
15.8
24.7
26.7
29.8
32.2
34.6
7.4
8.5
10.3
9.4
10.7
WGS 130A to 190A
22.0
25.3
30.7
28.1
32.0
41.1
44.5
49.6
53.7
57.6
18.5
21.3
25.8
23.8
27.1
55.1
63.5
77.1
71.1
80.9
17
Refrigerant Piping
Unit with Remote Condenser
General
For remote condenser application (WGS-AA), the chillers are shipped with a nitrogen/helium holding charge of
20 psi is used to pressurize the system with a slight positive pressure to prevent contaminants from entering the
unit. This holding charge should not be mistaken as a refrigerant charge, and can not be used as part of the final
total refrigerant charge. After installation, the unit should be pressurized and tested for leaks, vacuumed and
charged with the correct refrigerant operating charge, taking into consideration the length of refrigerant piping.
The operating charge is field-supplied and charged for remote condenser models.
It is important that the unit be kept tightly closed until the remote condenser is installed and piped to the unit. It is
the contractor’s responsibility to install the interconnection piping, leak-test the entire system, evacuate the
system, and supply the system refrigerant charge. The system should be held under vacuum until it is charged
under supervision of the Daikin Applied authorized service technician who will supervise unit commissioning.
The unit operating charge (less piping and condenser) can be found on page 26.
!
IMPORTANT NOTE
!
Service Form SF99006 and an isometric sketch of the Remote Piping Layout showing pipe size, location of fittings,
measured lengths and elevations MUST BE SUBMITTED TO Daikin Technical Response Center and reviewed
before order entry. A Daikin Applied service representative will not perform startup without reviewed Service Form
SF99006 and drawing. Installation must match reviewed drawing.
All field piping, wiring and procedures must comply with design guidelines set forth in the product literature, and be
performed in accordance with ASHRAE, EPA, local codes and industry standards and per included sizing tables. Any
product failure caused, or contributed to, by failure to comply with appropriate design guidelines will not be covered by
manufacturer’s warranty.
Daikin Technical Response: Fax: 763-509-7666; Phone : 540-248-9201;
e-mail: techresponse@daikinapplied.com
The following notes apply to all size units:





Maximum linear line length shall not exceed 75 feet.
Maximum Total Equivalent Length (TEL) shall not exceed 180 feet.
The condenser shall not be located more than 15 feet above the indoor unit.
The condenser shall not be located more than 20 feet below the indoor unit.
No underground piping.
It is important that the unit piping be properly supported with sound and vibration isolation between tubing and
hanger, and that the discharge lines be looped at the condenser and trapped at the compressor to prevent
refrigerant and oil from draining into the compressors. Looping the discharge line also provides greater line
flexibility.
The discharge gas valves, liquid line solenoids, filter-driers, moisture indicators, and thermostatic expansion
valves are all factory-mounted as standard equipment with the water chiller.
After the equipment is properly installed, leak tested, and evacuated, it can be charged with R-134a and started
under Daikin Applied service supervision. Total operating charge will depend on the air-cooled condenser used
and volume of the refrigerant piping.
Note: On the arrangement WGS-AA units (units with remote condensers), the installer must record the refrigerant charge by
stamping the total charge and the charge per circuit on the serial plate in the appropriate blocks provided for this purpose.
18
WGS 130A to 190A
IMM1157-1
The following discussion is intended for use as a general guide to the piping of air-cooled and evaporative
condensers.
Use the tables shown in this manual for sizing the discharge and liquid lines. Discharge lines must be designed to
handle oil properly and to protect the compressor from damage that can result from condensing liquid refrigerant
in the line during shutdown. Careful consideration must be given for sizing each section of piping so that gas
velocities are sufficient at all operating conditions to carry oil. If the velocity in a vertical discharge riser is too
low, considerable oil can collect in the riser and the horizontal header, causing the compressor to lose its oil and
result in damage due to lack of lubrication. When the compressor load is increased, the oil that had collected
during reduced loads can be carried as a slug through the system and back to the compressor, where a sudden
increase of oil concentration can cause liquid slugging and damage to the compressor.
Any horizontal run of discharge piping should be pitched away from the compressor approximately 1/8-inch per
foot (10.4 mm per m) or more. This is necessary to move, by gravity, any oil lying in the header.
Any discharge line coming into a horizontal discharge header should rise above the centerline of the discharge
header. This is necessary to prevent liquid refrigerant from draining from the condenser when the compressor is
not operating. If the compressors are lower than the condenser, or refrigerant migration is possible, a check valve
should be installed at the condenser.
A check/relief valve may be necessary in the liquid line at the condenser for applications where the liquid line is
higher than the condensing unit or where refrigerant migration is an issue. The liquid line should be insulated
when it is routed where the ambient exposure is higher than the condenser’s ambient temperature. A relief device
may also be required in the discharge line piping.
Figure 9 illustrates a typical piping arrangement involving a remote air-cooled condenser located at a higher
elevation than the compressor. This arrangement is commonly encountered when the air-cooled condenser is on a
roof and the compressor is on grade level or in a basement equipment room.
Notice in Figure 9 that the discharge line is looped at the bottom and top of the vertical run. This is done to
prevent oil and condensed refrigerant from flowing back into the compressor and causing damage. The highest
point in the discharge line should always be above the highest point in the condenser coil. Include a purging vent
at this point to extract non-condensables from the system. This method should also be employed if the air-cooled
condenser is located on the same level as the compressor.
Head Pressure Control
The MicroTech II circuit controllers are capable of controlling the fans of remote air-cooled condensers connected
to each of the unit’s two refrigerant circuits. Control is based on condensing temperature and uses a combination
of fan variable frequency drive (VFD) and fan cycling.
Recommended Refrigerant Pipe Sizes
NOTES:
1.
2.
Pressure drop is in equivalent degrees F.
On WGS 140 and 170, the # 1 circuit is always the smallest and is closest to the control panel.
Horizontal or Downflow Discharge Line Sizes
Recommended Discharge Line Size, inch, O.D.
Nominal
Circuit
Tons
Conn.
Size
At Unit
WGS 130, Both
WGS 140, Cir #1
65
2 5/8
Line Size
Press Drop, F
2 5/8
0.55
2 5/8
0.82
2 5/8
1.10
2 5/8
1.37
2 5/8
1.64
WGS 140, Cir #2
WGS 160, Both
WGS 170, Cir #1
80
2 5/8
Line Size
Press Drop,  F
2 5/8
0.80
2 5/8
1.21
2 5/8
1.61
2 5/8
2.01
3 1/8
1.04
WGS 170, Cir #2
WGS 190, Both
95
2 5/8
Line Size
Press Drop, F
2 5/8
1.08
2 5/8
1.62
2 5/8
2.16
3 1/8
1.17
3 1/8
1.40
Unit, Circuit
IMM1157-1
Up to
Up to
Up to
Up to
Up to
50 Equiv.Ft 75 Equiv.Ft 100 Equiv.Ft. 125 Equiv.Ft. 150 Equiv.Ft.
WGS 130A to 190A
19
Recommended Vertical Upflow Discharge Line Sizes
Unit, Circuit
Recommended Discharge Line Size, inch,
O.D.
Nominal Connection
Circuit
Size, O.D.
Tons
at WGS Unit
Up to
50 Equiv. Ft
Up to
75 Equiv. Ft
Up to
100 Equiv. Ft.
WGS 130, Both
WGS 140, Cir #1
65
2 5/8
Line Size
Press Drop, F
2 1/8
1.52
2 1/8
2.28
2 1/8
3.03
WGS 140, Cir #2
WGS 160, Both
WGS 170, Cir #1
80
2 5/8
Line Size
Press Drop, F
2 5/8
0.80
2 5/8
0.99
2 5/8
1.32
WGS 170, Cir #2
WGS 190, Both
95
2 5/8
Line Size
Press Drop, F
2 5/8
0.94
2 5/8
1.41
2 5/8
1.88
Recommended Liquid Line Size
Unit, Circuit
Recommended Liquid Line Size, inch O.D.
Nominal Conn.
Circuit Size,
Tons at Unit
Up to
Up to
Up to
Up to
Up to
50 Equiv.Ft 75 Equiv.Ft 100 Equiv.Ft. 125 Equiv.Ft. 150 Equiv.Ft.
WGS 130, Both
WGS 140, Cir #1
65
1 3/8
Line Size
Press Drop, F
1 3/8
0.76
1 3/8
1.14
1 3/8
1.52
1 3/8
1.89
1 3/8
2.27
WGS 140, Cir #2
WGS 160, Both
WGS 170, Cir #1
80
1 3/8
Line Size
Press Drop, F
1 3/8
1.11
1 3/8
1.67
1 3/8
2.23
1 3/8
2.78
1 3/8
3.34
WGS 170, Cir #2
WGS190, Both
95
1 3/8
Line Size
Press Drop, F
1 3/8
1.50
1 3/8
2.25
1 5/8
1.33
1 5/8
1.66
1 5/8
1.99
Figure 9, Condenser Above Compressor (One of Two Circuits Shown)
Check Valve
(Preferred)

Relief Valve
Pressure Tap
Condenser
Pitch


Discharge Line

Maximum linear line length shall
not exceed 75 ft.
Maximum Total Equivalent
Length (TEL) shall not exceed
180 ft.
The condenser shall not be
located more than 15 ft above
the indoor unit.
The condenser shall not be
located more than 20 ft below
the indoor unit.
Loop
To
Evaporator
20
WGS 130A to 190A
IMM1157-1
Factory-Mounted Condenser
Units with the standard factory-mounted, water-cooled condensers are provided with complete refrigerant piping
and full operating refrigerant charge at the factory.
There is a possibility on water-cooled units utilizing low temperature pond or river water as a condensing medium
that if the water valves leak, the condenser and liquid line refrigerant temperature could drop below the equipment
room temperature on the “off” cycle. This problem arises only during periods when cold water continues to
circulate through the condenser and the unit remains off due to satisfied cooling load.
If this condition occurs:
1. Cycle the condenser pump off with the unit.
2. Check the liquid line solenoid valve for proper operation.
Relief Valve Piping
The ANSI/ASHRAE Standard 15, Safety Standard for Refrigeration Systems, specifies that pressure relief valves
on vessels containing Group 1 refrigerant (R-134a) “shall discharge to the atmosphere at a location not less than
15 feet (4.6 meters) above the adjoining ground level and not less than 20 feet (6.1 meters) from any window,
ventilation opening or exit in any building.” The piping must be provided with a rain cap at the outside
terminating point and with a drain at the low point on the vent piping to prevent water buildup on the atmospheric
side of the relief valve. In addition, a flexible pipe section should be installed in the line to eliminate any piping
stress on the relief valve(s).
The size of the discharge pipe from the pressure relief valve should not be less than the size of the pressure relief
outlet. When two or more valves are piped together, the common header and piping to the atmosphere should not
be less than the sum of the area of each of the lines connected to the header.
The locations of the unit relief valves are shown on the piping schematic drawing on page 27. There are six valves
on the water-cooled units, one for each circuit on the compressor oil separator (54 lb. air/min., 350 psi), suction
line (17.3 lb. air/min., 200 psi), and condenser (54 lb. air/min., 350 psi). Remote condenser models have four
valves.
NOTE: Provide fittings to permit vent piping to be easily disconnected for inspection or replacement of
the relief valve.
Figure 10, Relief Valve Piping
IMM1157-1
WGS 130A to 190A
21
Dimensional Data
WGS-AW Water-Cooled
Figure 11, WGS 130AW through WGS 190AW Packaged Chiller
Without Optional Condenser Water Manifolds
REMOVABLE
LIFTING
BRACKETS
13.8
(350.5)
8.3
(210.8)
20.5
(520.7)
169.9 (4315.5)
29.0
(736.6)
“X”
RELIEF
VALVE
RELIEF
VALVE
CONTROL
PANEL
CIRC. #1
RELIEF
VALVES
(ONE
HIDDEN)
CIRC. #2
FIELD POWER
KNOCKOUTS
VENT
“A”
EVAPORATOR
“C”
WATER OUT DRAIN
“Y”
“Z”
FIELD CONTROL
KNOCKOUTS
120.0" (3048.0)
RECOMMENDED
CLEARANCE
FOR
CONDENSER
TUBE
SERVICING
31.8
(807.7)
16.2
(411.5)
“B”
34.0
(863.6)
WATER IN
“D”
WATER OUT
RELIEF VALVES
1 PER CIRCUIT
CONDENSER
WATER IN
4.0 IN. (101.6)
SCH 40 PIPE
VICTAULIC
GROOVED.
INLET AND
OUTLET
0 .88 (22.4) MOUNTING HOLES TYP. 4
114.8 (2915.9)
11.75 (298.4)
14.75 (374.6)
REMOVABLE
LIFTING
BRACKETS
330643201D010B
WGS 130-190 Packaged
Notes:
1.
Unit water connection handing is oriented facing the control panel.
2.
Unit shown with standard right-hand evaporator connections. Left-hand available as option.
3.
Condenser connections available only as shown.
22
Evaporator
Victualic
Inches (mm)
Dimensions
Inches (mm)
WGS
Models
Center of Gravity
Inches (mm)
Additions for Sound
Enclosure
Inches (mm)
“A”
“B”
“C”
“D”
“X”
“Y”
“Z”
Length
Width
Height
WGS 130AW140AW
74.6
(1894.8)
29.3
(744.2)
95.0
(2413.0)
6.0
(152.4)
83.9
(2131.1)
35.8
(909.3)
16.8
(426.7)
4.0
(101.6)
2.5
(63.5)
3.0
(76.2)
WGS 160AW190AW
76.6
(1945.6)
30.4
(772.2)
92.9
(2359.6)
8.0
(203.2)
84.0
(2133.6)
36.0
(914.4)
16.8
(426.7)
4.0
(101.6)
2.5
(63.5)
5.0
(127.0)
WGS 130A to 190A
IMM1157-1
WGS-AW, Water-Cooled with Optional Condenser Manifolds
Figure 12 WGS 130AW through 190AW with Optional Condenser Manifolds
REMOVABLE
LIFTING
BRACKETS
13.8
(350.5)
8.3
(210.8)
20.5
(520.7)
169.9 (4315.5)
“X”
29.0
(736.6)0
RELIEF
VALVE
RELIEF VALVE
RELIEF
VALVES
(ONE
HIDDEN)
CONTROL
PANEL
CIRC. #1
CIRC. #2
FIELD POWER
KNOCKOUTS
VENT
“A”
EVAPORATOR
WATER OUT
DRAIN
“C”
WATER IN
“D”
“Y”
31.8
(807.7)
“Z”
“B”
0 .88 (22.4) MOUNTING HOLES TYP. 4
16.2
(411.5)
34.0
FIELD CONTROL (863.6)
KNOCKOUTS
WATER OUT
RELIEF VALVES
1 PER CIRCUIT
CONDENSER
114.8 (2915.9)
WATER IN
4.0 IN. (101.6)
SCH 40 PIPE
VICTAULIC
GROOVED.
INLET AND
OUTLET
32.0 (812.8)
35.0 (889.0)
330643601D010B
WGS 130-190 w/Manifold
REMOVABLE
LIFTING
BRACKETS
Notes:
1.
Unit water connection handing is oriented facing the control panel.
2.
Unit shown with standard right-hand evaporator connections. Left-hand available as option.
3.
Condenser connections available only as shown.
IMM1157-1
Evaporator
Victualic
Inches (mm)
Dimensions
Inches (mm)
WGS
Models
Center of Gravity
Inches (mm)
Additions for Sound
Enclosure
Inches (mm)
“A”
“B”
“C”
“D”
“X”
“Y”
“Z”
Length
Width
Height
WGS 130AW140AW
74.6
(1894.8)
29.3
(744.2)
95.0
(2413.0)
6.0
(152.4)
83.9
(2131.1)
35.8
(909.3)
16.8
(426.7)
4.0
(101.6)
2.5
(63.5)
3.0
(76.2)
WGS 160AW190AW
76.6
(1945.6)
30.4
(772.2)
92.9
(2359.6)
8.0
(203.2)
84.0
(2133.6)
36.0
(914.4)
16.8
(426.7)
4.0
(101.6)
2.5
(63.5)
5.0
(127.0)
WGS 130A to 190A
23
WGS-AA Remote Condenser
Figure 13, Dimensions, WGS 130AA through WGS 190AA Remote Condenser
85.6 (2174.2)
77.8 (1976.1)
REAR
VIEW
“E”
19.3
(490.2)
0 2.625" DISCHARGE #1
FIELD CONNECTION
0 1.375" LIQUID #2
FIELD CONNECTION
“D”
0 2.625" DISCHARGE #2
FIELD CONNECTION
0 1.375" LIQUID #1
FIELD CONNECTION
“F”
32.0 (812.8)
179.3 (4554.2)
“X”
FRONT
VIEW
RELIEF VALVE
RELIEF VALVE
CONTROL
PANEL
FIELD POWER
KNOCKOUTS
CIRC. #1
RELIEF VALVES
(ONE HIDDEN)
CIRC. #2
“A”
VENT
“Y”
“C”
EVAPORATOR
WATER
OUT
WATER IN
DRAIN
“Z”
18.0
(457.2)
0 .88 MOUNTING
HOLES 4 PLACES
34.0 (863.6)
LIFTING HOLES
4 PLACES
VICTAULIC GROOVED
INLET AND OUTLET
6.00 SCH 40 PIPE
for WGS 130-140
“B”
FIELD CONTROL
KNOCKOUTS
12.0
(304.8)
155.3 (3944.6)
8.00 SCH 40 PIPE
FOR WGS 160-190
330643401D010B
WGS 130-190 Less Condenser
Notes:
1.
2.
Unit water connection handing is oriented facing the control panel.
Unit shown has right hand evaporator water connections.
Dimensions
Inches (mm)
WGS
Models
WGS 130140AW
WGS 160190AW
24
“A”
“B”
“C”
“D”
60.8
(1544.3)
38.1
(967.7)
95.0
(2413.0)
33.1
(840.7)
62.8
(1595.1)
39.6
(1005.8)
92.9
(2359.7)
32.7
(830.6)
Center of Gravity
Inches (mm)
“E”
“F”
Additions for Sound
Enclosure
Inches (mm)
“X”
“Y”
“Z”
Length
Width
Height
26.1
19.7
(662.9) (500.4)
92.3
(2344.4)
32.3
(820.4)
16.8
(426.7)
4.0
(101.6)
2.5
(63.5)
3.0
(76.2)
25.7
21.7
(652.8) (551.2)
92.5
(2349.5)
32.5
(825.5)
16.7
(424.2)
4.0
(101.6)
2.5
(63.5)
5.0
(127.0)
WGS 130A to 190A
IMM1157-1
Physical Data
WGS-AW, Water-Cooled
Table 10, WGS-130AW - WGS-190AW
WGS UNIT SIZE
Unit capacity @ ARI conditions
tons, (kW) (1)
No. Circuits
COMPRESSORS, Frame 3
Nominal Horsepower
Number (2)
% Minimum Capacity (Modulated)
Oil Charge per Compressor oz., (l)
CONDENSER
Number
No. Refrigerant Circuits
Diameter, in., (mm)
Tube Length, in., (mm)
130AW
140AW
160AW
170AW
190AW
130.0 (457.1)
140.7 (494.7)
156.7 (551.0)
169.6 (596.3)
182.1 (640.3)
2
2
2
2
2
65
1
65
1
65
1
80
1
80
1
80
1
80
1
95
1
95
1
95
1
15
256 (7.6)
13/17
256 (7.6)
15
256 (7.6)
14/16
256 (7.6)
15
256 (7.6)
2
1
12 (305)
120 (3048)
2
1
12 (305)
120 (3048)
2
1
12 (305)
120 (3048)
2
1
12 (305)
120 (3048)
2
1
12 (305)
120 (3048)
Design W.P. psig, (kPa):
Refrigerant Side
350 (2413)
350 (2413)
350 (2413)
350 (2413)
350 (2413)
Water Side
150 (1034)
150 (1034)
150 (1034)
150 (1034)
150 (1034)
No. of Passes
2
2
2
2
2
Pump-Out Capacity per Circuit,
330 (150)
330 (150)
330 (150)
296 (134)
296 (134)
lb., (kg) (3)
Connections:
Water In & Out, in, (mm) victaulic
4.0 (101)
4.0 (101)
4.0 (101)
4.0 (101)
4.0 (101)
Relief Valve, In., (mm)
0.5 (12.7)
0.5 (12.7)
0.5 (12.7)
0.5 (12.7)
0.5 (12.7)
Purge Valve, Flare In., (mm)
.625 (15.9)
.625 (15.9)
.625 (15.9)
.625 (15.9)
.625 (15.9)
Vent & Drain, in. (mm) FPT
0.5 (12.7)
0.5 (12.7)
0.5 (12.7)
0.5 (12.7)
0.5 (12.7)
Liquid Subcooling
Integral
Integral
Integral
Integral
Integral
EVAPORATOR
Number
1
1
1
1
1
No. Refrigerant Circuits
2
2
2
2
2
Water Volume, gallons, (l)
68 (257)
68 (257)
115 (435)
115 (435)
115 (435)
Refrig. Side D.W.P., psig, (kPa)
354 (2441)
354 (2441)
354 (2441)
354 (2441)
354 (2441)
Water Side D.W.P., psig, (kPa)
152 (1048)
152 (1048)
152 (1048)
152 (1048)
152 (1048)
Water Connections:
Inlet & Outlet, in., (mm) victaulic
6.0 (152)
6.0 (152)
8.0 (203)
8.0 (203)
8.0 (203)
Drain & Vent (NPT INT.)
0.5
0.5
0.5
0.5
0.5
UNIT DIMENSIONS (4)
Length In., (mm)
169.9 (4315.5)
169.9 (4315.5) 169.9 (4315.5) 169.9 (4315.5)
169.9 (4315.5)
Width In., (mm)
34 (864)
34 (864)
34 (864)
34 (864)
34 (864)
Height In., (mm)
74 (1880)
74 (1880)
75.5 (1918)
75.5 (1918)
75.5 (1918)
UNIT WEIGHTS (5)
Operating Weight, lb., (kg)
8557 (3881)
8557 (3881)
9314 (4225)
9505 (4311)
9505 (4311)
Shipping Weight, lb., (kg)
7840 (3556)
7840 (3556)
8206 (3722)
8345 (3785)
8345 (3785)
Operating Charge per Circuit,
127 (58)
127 (58)
128 (58)
124 (56)
124 (56)
R-134a, lb., (kg)
Notes:
1. Certified in accordance with ARI Standard 550/590-98.
2. All units have one compressor per circuit.
3. 80% full R-134a at 90°F (32°C) per refrigerant circuit.
4. Dimensions are without the optional sound enclosure. See dimension drawings for enclosure dimensions.
5. The optional sound enclosure adds 650 lbs (295 kg) to the shipping and operating weights.
IMM1157-1
WGS 130A to 190A
25
WGS-AA Remote Condenser
Table 11, WGS-130AA - WGS-190AA
WGS UNIT SIZE
130AA
140AA
160AA
170AA
190AA
Unit capacity @ 44F LWT,
116.0 (407.9)
125.9 (442.7)
136.1 (478.5)
148.0 (520.4)
160.1 (562.9)
125F SDT, tons, (kW)
No. Circuits
2
2
2
2
2
COMPRESSORS, FRAME 3
Nominal Horsepower
65
65
65
80
80
80
80
95
95
95
Number (2)
1
1
1
1
1
1
1
1
1
1
% Minimum Capacity (Modulated)
15
13/17
15
14/16
15
Oil Charge per Compressor oz., (l)
256 (7.6)
256 (7.6)
256 (7.6)
256 (7.6)
256 (7.6)
CONDENSER (Remote)
EVAPORATOR
Number
1
1
1
1
1
No. Refrigerant Circuits
2
2
2
2
2
Water Volume, gallons, (l)
68 (257)
68 (257)
115 (435)
115 (435)
115 (435)
Refrig. Side D.W.P., psig, (kPa)
354 (2441)
354 (2441)
354 (2441)
354 (2441)
354 (2441)
Water Side D.W.P., psig, (kPa)
152 (1048)
152 (1048)
152 (1048)
152 (1048)
152 (1048)
Water Connections:
Inlet & Outlet, in., (mm) victaulic
6.0 (152)
6.0 (152)
8.0 (203)
8.0 (203)
8.0 (203)
Drain & Vent (NPT INT.)
0.5
0.5
0.5
0.5
0.5
UNIT DIMENSIONS (3)
Length In., (mm)
179.3 (4554.2)
179.3 (4554.2) 179.3 (4554.2) 179.3 (4554.2)
179.3 (4554.2)
Width In., (mm)
34 (864)
34 (864)
34 (864)
34 (864)
34 (864)
Height In., (mm)
60 (1524)
60 (1524)
61.8 (1570)
61.8 (1570)
61.8 (1570)
UNIT WEIGHTS (4)
Operating Weight, lb., (kg)
6265 (2841)
6265 (2841)
7022 (3185)
7022 (3185)
7022 (3185)
Shipping Weight, lb., (kg)
5659 (2567)
5659 (2567)
6024 (2732)
6024 (2732)
6024 (2732)
Operating Charge per Circuit,
35 (15.9)
35 (15.9)
36 (16.5)
36 (16.5)
36 (16.5)
lb., (kg) R-134a
Notes:
1. Certified in accordance with ARI Standard 550/590-98.
2. Dimensions are without the optional sound enclosure. See dimension drawings for enclosure dimensions.
3. The optional sound enclosure adds 650 lbs (295 kg) to the shipping and operating weights.
26
WGS 130A to 190A
IMM1157-1
Unit Configuration
The chiller unit has two refrigerant circuits, each with a single semi-hermetic rotary screw
compressor, a shared two-circuited shell-and-tube evaporator, a water-cooled condenser,
interconnecting refrigerant piping and refrigerant specialties. A single two-section control panel
contains the control and starting equipment.
Figure 14, Schematic Piping Diagram (One of Two Circuits)
DISCHARGE TUBING
DISCHARGE SHUT-OFF AND CHECK VALVE
SCHRADER
VALVE
SUCTION SHUT-OFF
VALVE (OPTIONAL)
SCREW COMPRESSOR
PRESSURE
RELIEF
VALVE
CHARGING VALVE
SCHRADER VALVE
SUCTION TUBING
WATER OUT
PRESSURE RELIEF VALVE
WATER IN
ELECTRONIC
EXPANSION
VALVE
DX EVAPORATOR
PRESSURE RELIEF VALVE
CHARGING VALVE
SCHRADER
VALVE
WATER OUT
WATER COOLED CONDENSER
LIQUID
TUBING
WATER IN
PACKAGE UNIT ONLY
LIQUID SIGHT GLASS
LESS CONDENSER UNIT ONLY
FIELD DISCHARGE CONNECTION.
FIELD LIQUID CONNECTION.
SCHRADER VALVE
(LESS CONDENSER ONLY)
LIQUID
FILTER
DRYER
LIQUID SHUT-OFF VALVE
330643901 -C010A
WGS REFRIGERANT PIPING
Components
Table 12, Major Components
Unit
Size
IMM1157-1
Compressor Size
Frame 3200
Condenser Size
Evaporator Size
System #1
System #2
System #1
System #2
130A
Small
Small
EV40271212
C1210-101
C1210-101
140A
Small
Medium
EV40271212
C1210-101
C1210-101
160A
Medium
Medium
EV50271313
C1210-101
C1210-101
170A
Medium
Large
EV50271313
C1210-121
C1210-121
190A
Large
Large
EV50271313
C1210-121
C1210-121
WGS 130A to 190A
27
Wiring
Field Wiring, Power
The WGS “A” vintage chillers are built standard with:

Multi-point (2) power supply to a terminal block per circuit with no compressor
isolation circuit breakers.
Optional power connections include:






Multi-point power connection to a non-fused disconnect switches with through-thedoor handle mounted in the control box in lieu of the power block
Multi-point power connection to high interrupt rated disconnect switches with throughthe-door handle
Multi-point power connection to high interrupt disconnect switches with through-thedoor handle in a high short circuit current rated panel
Single point power connection to a terminal block with individual compressor isolation
circuit breakers per circuit
Single point power connection to high interrupt circuit breakers with through-the-door
handles and with individual compressor isolation circuit breakers per circuit
Single point power connection to a high interrupt rated disconnect switch in a high
short circuit current rated panel and with individual compressor isolation circuit
breakers per circuit.
A factory installed control circuit transformer is standard. Optionally, a field-installed
control power source can be wired to the unit.
Circuit breakers for backup compressor short circuit protection are standard on all units.
Wiring and conduit selections must comply with the National Electrical Code and/or local
requirements.
An open fuse indicates a short, ground, or overload. Before replacing a fuse or restarting a
compressor, the trouble must be found and corrected. Tables in the Electrical Data section
(page 30) give specific information on recommended wire sizes.
NOTE: Use only copper conductors in main terminal block. Terminations are sized
for copper only.
Field Wiring, Control
A factory-mounted control transformer is provided to supply the correct control circuit
voltage.
The transformer power leads are connected to the power block PB1 or disconnect switch
DS1.
Interlock Wiring, Condenser Pump Starter or Air-Cooled Condenser
Fan Starter
The MicroTech II controller can interlock a condenser pump starter, and tower fans, and
control a tower bypass valve on water-cooled units. Up to six air-cooled condenser fan
contactors per circuit can be controlled by the MicroTech II unit controller on remote
condenser applications. Pressure switches supplied with the condenser can also control
condenser fan operation. Coil voltage must be 115 volts with a maximum of 20 VA.
An evaporator and condenser (water-cooled units only) flow switch is necessary on all
units. It is also advisable to wire a chilled water pump interlock in series with the flow
switch for additional evaporator freeze protection.
28
WGS 130A to 190A
IMM1157-1
Ambient Air Sensor
Units with a remote air-cooled condenser will have an outdoor air sensor furnished with the
unit inside the control panel and wired to the correct terminals. It must be installed outdoors
in a location that will give the true outdoor temperature that the condenser coils will see.
Splicing of the sensor lead may be required. The sensor must be installed for the unit to
operate.
BAS Interface
Connection to the chiller for all building automation systems (BAS) protocols is at the unit
controller. An optional interface module, depending on the protocol being used, may have
been factory-installed in the unit controller (or it can be field installed).
Protocols Supported
Table 13, Standard Protocol Data
Protocol
Physical Layer
Data Rate
Controller
Other
BACnet/IP or
BACnet/Ethernet
Ethernet 10 Base-T
10 Megabits/sec
MicroTech II
Reference ED 15062
BACnet MSTP
RS-485
MicroTech II
Reference ED 15062
MicroTech II
Reference ED 15062
MicroTech II
Reference ED 15063
LONWORKS

Modbus RTU
FTT-10A
RS-485 or RS-232
9600, 19200 or
38400 bits/sec
78kbits/sec
9600 or 19200
bits/sec
The interface kits on the MicroTech II controller are as follows:
 BACnet Kit P/N 350147404: BACnet/IP, BACnet MS/TP, or BACnet Ethernet
 LONWORKS
 Units equipped with a pCo2 (with DIP switches) for CP1 require Kit P/N
350147401.
 Units equipped with a pCo3 (no DIP switches) for CP1 require Kit P/N 350147409.
 Modbus: Modbus RTU
Optional Open Choices™ BAS interfaces. The locations and interconnection requirements
for the various standard protocols are found in their respective installation manuals.
Modbus IM 743-2
LONWORKS IM 735-2
BACnet IM 736-2
Referenced documents may be obtained from the local Daikin Applied sales office, from
the local Daikin Applied service office, or from the Daikin Technical Response Center,
located in Staunton, Virginia (540-248-0711).
These documents can also be found on www.DaikinApplied.com under Product
Information > (chiller type) > Control Integration.
 The following are trademarks or registered trademarks of their respective companies:
BACnet from the American Society of Heating, Refrigerating and Air-Conditioning
Engineers, Inc., LonTalk, LONMARK and LONWORKS from Echelon Corporation, and
Modbus and Modbus RTU from Schneider Electric.
Remote Operator Interface Panel
The box containing the optional remote interface panel will have installation instructions,
IOM MT II Remote, shipped with it. The manual is also available for downloading from
www.DaikinApplied.com.
IMM1157-1
WGS 130A to 190A
29
Electrical Data
Table 14, Electrical Data, Water-cooled, Single-Point Connection
WGS
UNIT
SIZE
130AW
140AW
160AW
170AW
190AW
VOLTS
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
POWER SUPPLY
FIELD WIRE
MINIMUM
CIRCUIT
AMPACITY
(MCA)
QTY
n/a
n/a
243
201
162
n/a
n/a
253
209
169
n/a
n/a
261
216
174
n/a
n/a
276
228
182
n/a
n/a
288
237
189
n/a
n/a
3
3
3
n/a
n/a
3
3
3
n/a
n/a
3
3
3
n/a
n/a
3
3
3
n/a
n/a
3
3
3
MIN. WIRE
GAUGE
n/a
n/a
250
4/0
2/0
n/a
n/a
250
4/0
2/0
n/a
n/a
300
4/0
2/0
n/a
n/a
300
4/0
3/0
n/a
n/a
350
250
3/0
FIELD FUSE SIZE or
BREAKER SIZE
RECOMMENDED
n/a
n/a
300
225
200
n/a
n/a
300
250
200
n/a
n/a
300
250
200
n/a
n/a
350
300
225
n/a
n/a
350
300
225
MAXIMUM
n/a
n/a
350
250
225
n/a
n/a
350
300
225
n/a
n/a
350
300
250
n/a
n/a
400
300
250
n/a
n/a
400
300
250
Notes
1.
Table based on 75°C field wire.
2.
Complete notes are on page 40.
30
WGS 130A to 190A
IMM1157-1
Table 15, Electrical Data, Water-cooled, Multiple-Point Connection
WGS
UNIT
SIZE
130AW
140AW
160AW
170AW
190AW
ELECTRICAL CIRCUIT 1 (COMP 1)
ELECTRICAL CIRCUIT 2 (COMP 2)
POWER
FIELD FUSING
FIELD FUSING
MINIMUM
MINIMUM POWER SUPPLY
SUPPLY
VOLTS CIRCUIT
FIELD WIRE
CIRCUIT
REC
MAX
REC
MAX
FIELD WIRE
AMPS
AMPS
FUSE
FUSE
FUSE
FUSE
MIN. WIRE
MIN.WIRE
(MCA) QTY
(MCA)
QTY
SIZE
SIZE
SIZE
SIZE
GAUGE
GAUGE
208
247
3
250
300
400
247
3
250
300
400
230
223
3
4/0
300
400
223
3
4/0
300
400
380
135
3
1/0
175
225
135
3
1/0
175
225
460
112
3
2
150
200
112
3
2
150
200
575
90
3
3
110
150
90
3
3
110
150
208
247
3
250
300
400
267
3
300
350
450
230
223
3
4/0
300
400
240
3
250
300
400
380
135
3
1/0
175
225
145
3
1/0
175
250
460
112
3
2
150
200
120
3
1
150
200
575
90
3
3
110
150
97
3
3
125
150
208
267
3
300
350
450
267
3
300
350
450
230
240
3
250
300
400
240
3
250
300
400
380
145
3
1/0
175
250
145
3
1/0
175
250
460
120
3
1
150
200
120
3
1
150
200
575
97
3
3
125
150
97
3
3
125
150
208
267
3
300
350
450
292
3
350
350
500
230
240
3
250
300
400
263
3
300
350
450
380
145
3
1/0
175
250
160
3
2/0
200
250
460
120
3
1
150
200
132
3
1/0
175
225
575
97
3
3
125
150
105
3
2
150
175
208
292
3
350
350
500
292
3
350
350
500
230
263
3
300
350
450
263
3
300
350
450
380
160
3
2/0
200
250
160
3
2/0
200
250
460
132
3
1/0
175
225
132
3
1/0
175
225
575
105
3
2
150
175
105
3
2
150
175
NOTES:
1.
Table based on 75°C field wire.
2.
Complete notes are on page 40.
3.
3/0 wire is required for the disconnect switch option, 2/0 may be used for power block connection.
IMM1157-1
WGS 130A to 190A
31
Table 16, Electrical Data, Remote Condenser, Single-Point Connection
WGS
UNIT
SIZE
130AA
140AA
160AA
170AA
190AA
VOLTS
MINIMUM
CIRCUIT
AMPACITY
(MCA)
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
n/a
n/a
n/a
252
192
n/a
n/a
n/a
265
203
n/a
n/a
n/a
275
212
n/a
n/a
n/a
299
236
n/a
n/a
n/a
318
255
POWER SUPPLY
FIELD WIRE
MIN. WIRE
QTY
GAUGE
n/a
n/a
n/a
n/a
n/a
n/a
3
250 MCM
3
3/0 AWG
n/a
n/a
n/a
n/a
n/a
n/a
3
300 MCM
3
4/0 AWG
n/a
n/a
n/a
n/a
n/a
n/a
3
300 MCM
3
4/0 AWG
n/a
n/a
n/a
n/a
n/a
n/a
3
350 MCM
3
250 MCM
n/a
n/a
n/a
n/a
n/a
n/a
3
(2) 250 MCM
3
250 MCM
FIELD FUSE SIZE or
BREAKER SIZE
RECOMMAXIMUM
MENDED
n/a
n/a
n/a
n/a
n/a
n/a
300
350
225
250
n/a
n/a
n/a
n/a
n/a
n/a
300
350
250
250
n/a
n/a
n/a
n/a
n/a
n/a
350
350
250
300
n/a
n/a
n/a
n/a
n/a
n/a
350
400
300
300
n/a
n/a
n/a
n/a
n/a
n/a
400
450
300
350
Notes
1.
Table based on 75°C field wire.
2.
Complete notes are on page 40.
32
WGS 130A to 190A
IMM1157-1
Table 17, Electrical Data, Remote Condenser, Multiple-Point Connection
WGS
UNIT
SIZE
130AA
140AA
160AA
170AA
190AA
ELECTRICAL CIRCUIT 1 (COMP 1)
ELECTRICAL CIRCUIT 2 (COMP 2)
POWER
POWER
FIELD FUSING MINIMUM
FIELD FUSING
MINIMUM
SUPPLY
SUPPLY
VOLTS CIRCUIT
CIRCUIT
FIELD WIRE
FIELD WIRE
REC.
MAX
REC.
MAX
AMPS
AMPS
FUSE FUSE
FUSE
FUSE
MIN.WIRE
MIN.
WIRE
(MCA) QTY
(MCA) QTY
SIZE
SIZE
SIZE
SIZE
GAUGE
GAUGE
208
290
3
350
350
500
290
3
350
350
500
230
263
3
300
350
450
263
3
300
350
450
380
160
3
2/0
200
250
160
3
2/0
200
250
460
140
3
1/0
175
250
140
3
1/0
175
250
575
107
3
2
150
175
107
3
2
150
175
208
290
3
350
350
500
334
3
400
450
600
230
263
3
300
350
450
300
3
350
400
500
380
160
3
2/0
200
250
182
3
3/0
225
300
460
140
3
1/0
175
250
153
3
2/0
200
250
575
107
3
2
150
175
118
3
1
150
200
208
334
3
2-250
450
600
334
3
2-250
450
600
230
300
3
350
400
500
300
3
350
400
500
380
182
3
3/0
225
300
182
3
3/0
225
300
460
153
3
2/0
200
250
153
3
2/0
200
250
575
118
3
1
150
200
118
3
1
150
200
208
334
3
2-250
450
600
390
6
2-250
500
700
230
300
3
350
400
500
353
3
2-250
450
600
380
182
3
3/0
225
300
223
3
4/0
300
400
460
153
3
2/0
200
250
177
3
3/0
225
300
575
118
3
1
150
200
142
3
1/0
175
250
208
390
6
2-250
500
700
390
6
2-250
500
700
230
353
3
2-250
450
600
353
3
2-250
450
600
380
223
3
4/0
300
400
223
3
4/0
300
400
460
177
3
3/0
225
300
177
3
3/0
225
300
575
142
3
1/0
175
250
142
3
1/0
175
250
NOTES:
1.
Table based on 75°C field wire.
2.
Complete notes are on page 40.
3.
3/0 wire is required for the disconnect switch option, 2/0 may be used for power block connection.
IMM1157-1
WGS 130A to 190A
33
Table 18, Water-cooled,
Compressor Amp Draw
WGS
UNIT
SIZE
130AW
140AW
160AW
170AW
190AW
34
RATED LOAD AMPS
VOLTS
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
CIRCUIT #1 CIRCUIT #2
197
178
108
89
72
197
178
108
89
72
213
192
116
96
77
213
192
116
96
77
233
210
128
105
84
197
178
108
89
72
213
192
116
96
77
213
192
116
96
77
233
210
128
105
84
233
210
128
105
84
WGS 130A to 190A
Table 19, Remote Condenser,
Compressor Amp Draw
WGS
UNIT
SIZE
130AA
140AA
160AA
170AA
190AA
RATED LOAD AMPS
VOLTS
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
CIRCUIT #1 CIRCUIT #2
232
210
128
112
85
232
210
128
112
85
267
240
145
122
94
267
240
145
122
94
312
282
178
141
113
232
210
128
112
85
267
240
145
122
94
267
240
145
122
94
312
282
178
141
113
312
282
178
141
113
IMM1157-1
Table 20, Water-cooled, Field Wiring Information with Single-Point Power
WGS
UNIT
SIZE
130AW
140AW
160AW
170AW
190AW
WIRING TO STANDARD UNIT POWER BLOCK
VOLTS
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
TERMINAL SIZE
AMPS
n/a
n/a
400
400
400
n/a
n/a
400
400
400
n/a
n/a
400
400
400
n/a
n/a
400
400
400
n/a
n/a
400
400
400
CONNECTOR LUG RANGE
PER PHASE
(COPPER WIRE ONLY)
n/a
n/a
#6-350
#6-350
#6-350
n/a
n/a
#6-350
#6-350
#6-350
n/a
n/a
#6-350
#6-350
#6-350
n/a
n/a
#6-350
#6-350
#6-350
n/a
n/a
#6-350
#6-350
#6-350
WIRING TO OPTIONAL NONFUSED
DISCONNECT SWITCH IN UNIT
CONNECTOR LUG RANGE
SIZE
PER PHASE
AMPS
(COPPER WIRE ONLY)
n/a
n/a
n/a
n/a
400
3/0-500
250
#6-350
250
#6-350
n/a
n/a
n/a
n/a
400
3/0-500
250
#6-350
250
#6-350
n/a
n/a
n/a
n/a
400
3/0-500
250
#6-350
250
#6-350
n/a
n/a
n/a
n/a
400
3/0-500
250
#6-350
250
#6-350
n/a
n/a
n/a
n/a
400
3/0-500
250
#6-350
250
#6-350
Table 21, Remote Condenser, Field Wiring Information with Single-Point Power
WGS
UNIT
SIZE
130AA
140AA
160AA
170AA
190AA
IMM1157-1
WIRING TO STANDARD UNIT POWER BLOCK
VOLTS
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
TERMINAL SIZE
AMPS
n/a
n/a
n/a
400
400
n/a
n/a
n/a
400
400
n/a
n/a
n/a
400
400
n/a
n/a
n/a
400
400
n/a
n/a
n/a
400
400
CONNECTOR LUG RANGE
PER PHASE
(COPPER WIRE ONLY)
n/a
n/a
n/a
#6-350
#6-350
n/a
n/a
n/a
#6-350
#6-350
n/a
n/a
n/a
#6-350
#6-350
n/a
n/a
n/a
#6-350
#6-350
n/a
n/a
n/a
#6-350
#6-350
WIRING TO OPTIONAL NONFUSED
DISCONNECT SWITCH IN UNIT
CONNECTOR LUG RANGE
SIZE
PER PHASE
AMPS
(COPPER WIRE ONLY)
n/a
n/a
n/a
n/a
n/a
n/a
400
3/0-500
250
#6-350
n/a
n/a
n/a
n/a
n/a
n/a
400
3/0-500
250
#6-350
n/a
n/a
n/a
n/a
n/a
n/a
400
3/0-500
250
#6-350
n/a
n/a
n/a
n/a
n/a
n/a
400
3/0-500
250
#6-350
n/a
n/a
n/a
n/a
n/a
n/a
400
3/0-500
400
3/0-500
WGS 130A to 190A
35
Table 22, Water-cooled, Field Wiring to Multiple-Point Power Block
WIRING TO UNIT POWER BLOCK
CONNECTOR WIRE RANGE PER
VOLTS TERMINAL SIZE (AMPS)
PHASE (COPPER WIRE ONLY)
CKT 1
CKT 2
CKT 1
CKT 2
#6-350
#6-350
208
400
400
#6-350
#6-350
230
400
400
#6-350
#6-350
130AW 380
400
400
#6-350
#6-350
460
400
400
#6-350
#6-350
575
400
400
#6-350
#6-350
208
400
400
#6-350
#6-350
230
400
400
#6-350
#6-350
140AW 380
400
400
#6-350
#6-350
460
400
400
#6-350
#6-350
575
400
400
#6-350
#6-350
208
400
400
#6-350
#6-350
230
400
400
#6-350
#6-350
160AW 380
400
400
#6-350
#6-350
460
400
400
#6-350
#6-350
575
400
400
#6-350
#6-350
208
400
400
#6-350
#6-350
230
400
400
#6-350
#6-350
170AW 380
400
400
#6-350
#6-350
460
400
400
#6-350
#6-350
575
400
400
#6-350
#6-350
208
400
400
#6-350
#6-350
230
400
400
190AW
#6-350
#6-350
380
400
400
#6-350
#6-350
460
400
400
#6-350
#6-350
575
400
400
WGS
UNIT
SIZE
Table 23, Remote Condenser, Field Wiring to Multiple-Point Power Block
WIRING TO UNIT POWER BLOCK
CONNECTOR WIRE RANGE PER
VOLTS TERMINAL SIZE (AMPS)
PHASE (COPPER WIRE ONLY)
CKT 1
CKT 2
CKT 1
CKT 2
#6-350
#6-350
208
400
400
#6-350
#6-350
230
400
400
#6-350
#6-350
130AA
380
400
400
#6-350
#6-350
460
400
400
#6-350
#6-350
575
400
400
#6-350
#6-350
208
400
400
#6-350
#6-350
230
400
400
#6-350
#6-350
140AA
380
400
400
#6-350
#6-350
460
400
400
#6-350
#6-350
575
400
400
#6-350
#6-350
208
400
400
#6-350
#6-350
230
400
400
#6-350
#6-350
160AA
380
400
400
#6-350
#6-350
460
400
400
#6-350
#6-350
575
400
400
#6-350
#6-350
208
400
400
#6-350
#6-350
230
400
400
#6-350
#6-350
170AA
380
400
400
#6-350
#6-350
460
400
400
#6-350
#6-350
575
400
400
#6-350
#6-350
208
400
400
#6-350
#6-350
230
400
400
#6-350
#6-350
190AA
380
400
400
#6-350
#6-350
460
400
400
#6-350
#6-350
575
400
400
WGS
UNIT
SIZE
36
WGS 130A to 190A
IMM1157-1
Table 24, Water-cooled , Field Wiring to Multiple-Point Disconnect Switc
WGS
UNIT
SIZE
130AW
140AW
160AW
170AW
190AW
VOLTS
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
WIRING TO UNIT DISCONNECT SWITCH
TERMINAL SIZE
CONNECTOR WIRE RANGE PER PHASE
(AMPS)
(COPPER WIRE ONLY)
CKT 1
CKT 2
CKT 1
CKT 2
250
250
#6-350
#6-350
250
250
#6-350
#6-350
250
250
#6-350
#6-350
250
250
#6-350
#6-350
250
250
#6-350
#6-350
250
400
#6-350
3/0-500
250
250
#6-350
#6-350
250
250
#6-350
#6-350
250
250
#6-350
#6-350
250
250
#6-350
#6-350
400
400
3/0-500
3/0-500
250
250
#6-350
#6-350
250
250
#6-350
#6-350
250
250
#6-350
#6-350
250
250
#6-350
#6-350
400
400
3/0-500
3/0-500
250
400
#6-350
3/0-500
250
250
#6-350
#6-350
250
250
#6-350
#6-350
250
250
#6-350
#6-350
400
400
3/0-500
3/0-500
400
400
3/0-500
3/0-500
250
250
#6-350
#6-350
250
250
#6-350
#6-350
250
250
#6-350
#6-350
Table 25, Remote Condenser, Field Wiring to Multiple-Point Disconnect Switch
WGS
UNIT
SIZE
130AA
140AA
160AA
170AA
190AA
IMM1157-1
VOLTS
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
WIRING TO UNIT DISCONNECT SWITCH
TERMINAL SIZE
CONNECTOR WIRE RANGE PER PHASE
(AMPS)
(COPPER WIRE ONLY)
CKT 1
CKT 2
CKT 1
CKT 2
400
400
3/0-500
3/0-500
400
400
3/0-500
3/0-500
250
250
#6-350
#6-350
250
250
#6-350
#6-350
250
250
#6-350
#6-350
400
400
3/0-500
3/0-500
400
400
3/0-500
3/0-500
250
250
#6-350
#6-350
250
250
#6-350
#6-350
250
250
#6-350
#6-350
400
400
3/0-500
3/0-500
400
400
3/0-500
3/0-500
250
250
#6-350
#6-350
250
250
#6-350
#6-350
250
250
#6-350
#6-350
400
400
3/0-500
3/0-500
400
400
3/0-500
3/0-500
250
250
#6-350
#6-350
250
250
#6-350
#6-350
250
250
#6-350
#6-350
400
400
3/0-500
3/0-500
400
400
3/0-500
3/0-500
250
250
#6-350
#6-350
250
250
#6-350
#6-350
250
250
#6-350
#6-350
WGS 130A to 190A
37
Wiring Diagrams
Figure 15, WGS 130AW – 190AW Field Wiring Diagram
UNIT MAIN
DISCONNECT
(BY OTHERS) TERMINAL BLOCK
GND LUG
3 PHASE
TO COMPRESSOR(S)
POWER
SUPPLY
FUSED CONTROL
CIRCUIT TRANSFORMER FU4
FU5
120 VAC
NOTE: ALL FIELD WIRING TO BE
INSTALLED AS NEC CLASS 1
WIRING SYSTEM WITH CONDUCTOR
RATED 600 VOLTS
FU7
TB1
(115 VAC)
TB1-2
ALARM BELL
RELAY
1
BELL
2
1
EVAP. PUMP RELAY #1
(BY OTHERS)
120 VAC 1.0 AMP MAX
2
N
120 VAC
85
CHWR
EVAP. PUMP RELAY #2
(BY OTHERS)
120 VAC 1.0 AMP MAX
2
N
120 VAC
86
CWR
COND. PUMP RELAY #1
(BY OTHERS)
120 VAC 1.0 AMP MAX
2
87
CWR
COND. PUMP RELAY #2
(BY OTHERS)
120 VAC 1.0 AMP MAX
M11
TOWER FAN #1
(BY OTHERS)
120 VAC 1.0 AMP MAX
2
88
2
N
120 VAC
N
120 VAC
N
120 VAC
89
M12
TOWER FAN #2
(BY OTHERS)
120 VAC 1.0 AMP MAX
2
78
77
COOLING TOWER BYPASS
(BY OTHERS)
80
FACTORY SUPPLIED ALARM
FIELD WIRED
ALARM BELL
OPTION
(BY OTHERS)
79
ABR
81
ALARM BELL RELAY
ICE MODE
SWITCH
(BY OTHERS)
OFF
AUTO
MANUAL
OFF
AUTO
ON
N
0-10VDC
N
24 VAC
NOR. OPEN PUMP AUX.
CONTACTS (OPTIONAL)
NOR. OPEN PUMP AUX.
CONTACTS (OPTIONAL)
*MANDATORY IF FACTORY FLOW SWITCH OPTION IS NOT SELECTED
4-20MA FOR
+
EVAP. WATER RESET
(BY OTHERS)
4-20MA FOR
DEMAND LIMIT
(BY OTHERS)
60
66
897
IF REMOTE STOP CONTROL
IS USED, REMOVE LEAD 897
FROM TERM. 40 TO 53.
60
*MANDATORY IF FACTORY FLOW SWITCH OPTION IS NOT SELECTED
COND. FLOW
SWITCH
(BY OTHERS)
0-10VDC
TB1
(24 VAC OR 30 VDC)
ON
MANUAL
EVAP. FLOW
SWITCH
(BY OTHERS)
N
75
TIME
CLOCK
REMOTE STOP
SWITCH
(BY OTHERS)
NO
120 VAC
82
CHWR
COM
2 ALARM BELL OPTION
+
-
68
60
67
60
76
72
70
71
70
DWG. 330588201 REV. 0B
GND
38
WGS 130A to 190A
IMM1157-1
Figure 16, WGS 130AA – 190AA Field Wiring Diagram (Remote Condenser)
UNIT MAIN
DISCONNECT
(BY OTHERS) TERMINAL BLOCK
GND LUG
3 PHASE
TO COMPRESSOR(S)
POWER
SUPPLY
FUSED CONTROL
CIRCUIT TRANSFORMER FU4
FU5
120 VAC
NOTE: ALL FIELD WIRING TO BE
INSTALLED AS NEC CLASS 1
WIRING SYSTEM WITH CONDUCTOR
RATED 600 VOLTS
FU7
TB1
(115 VAC)
TB1-2
ALARM BELL
RELAY
1
BELL
2
CHWR
EVAP. PUMP RELAY #1
(BY OTHERS)
120 VAC 1.0 AMP MAX
CHWR
EVAP. PUMP RELAY #2
(BY OTHERS)
120 VAC 1.0 AMP MAX
FACTORY SUPPLIED ALARM
FIELD WIRED
ALARM BELL
OPTION
ABR
120 VAC
82
N
2
120 VAC
85
N
2
24 VAC
81
ALARM BELL RELAY
COM NO
2 ALARM BELL OPTION
1
75
CIRCUIT #1
CIRCUIT #2
TB6
M11
92
98
145
CONDENSER FAN
CONTACTOR COIL #193
M12
98
146
145
CONDENSER FAN
CONTACTOR COIL #294
M13
TB7
144
98
148
145
CONDENSER FAN
CONTACTOR COIL #3
95
M14
98
CONDENSER FAN
CONTACTOR COIL #4
96
M15
98
CONDENSER FAN
CONTACTOR COIL #597
M16
98
120 VAC
NO1
N
2
N
2
NO3
2
C
J12
120 VAC
N
(LOCATED ON
CIRCUIT
CONTROLLER)
98
M22
98
145
152
145
154
145
CONDENSER FAN
CONTACTOR COIL #6
NO4
245
2
N
M24
120 VAC
NO5
N
2
NO6
2
95
120 VAC
J13
(LOCATED ON
CIRCUIT
CONTROLLER)
98
98
M26
ON
254
120 VAC
NO1
2
N
120 VAC
NO2
2
N
120 VAC
NO3
2
C
N
C
NO4
2
120 VAC
N
120 VAC
NO5
2
N
J13
(LOCATED ON
CIRCUIT
CONTROLLER)
120 VAC
NO6
2
J12
(LOCATED ON
CIRCUIT
CONTROLLER)
N
TB1
(24 VAC)
60
MANUAL
97
245
CONDENSER FAN
CONTACTOR COIL #6
OFF
AUTO
252
245
CONDENSER FAN
CONTACTOR COIL #5
120 VAC
REMOTE STOP
SWITCH
(BY OTHERS)
96
98
M25
250
245
CONDENSER FAN
CONTACTOR COIL #4
N
TIME
CLOCK
897
66
IF REMOTE STOP CONTROL
IS USED, REMOVE LEAD 897
FROM TERM. 40 TO 53.
OFF
AUTO
ICE MODE
SWITCH
(BY OTHERS)
EVAP. FLOW
SWITCH
(BY OTHERS)
248
CONDENSER FAN
CONTACTOR COIL #3
C
150
246
245
CONDENSER FAN
CONTACTOR COIL #294
M23
244
245
CONDENSER FAN
CONTACTOR COIL #193
120 VAC
NO2
92
98
M21
ON
60
MANUAL
NOR. OPEN PUMP AUX.
CONTACTS (OPTIONAL)
*MANDATORY IF FACTORY FLOW SWITCH OPTION IS NOT SELECTED.
4-20MA FOR
EVAP. WATER RESET
(BY OTHERS)
4-20MA FOR
DEMAND LIMIT
(BY OTHERS)
+
-
+
-
68
60
67
72
70
71
70
GND
DWG. 330588101 REV. 0C
See notes on page 40.
IMM1157-1
WGS 130A to 190A
39
Notes for “Electrical Data Single/Multiple Point” Power:
1. Wire sizing amps is 10 amps if a separate 115V power supply is used.
2. Unit wire size ampacity is equal to 125% of the largest compressor motor, plus 100% of
the RLA of all other loads in the circuit, including the control transformer.
3. Recommended power lead wire sizes for 3 conductors per conduit are based on 100%
conductor ampacity in accordance with NEC. Voltage drop has not been included.
Therefore, power leads should be kept short. All terminal block connections must be
made with copper (type THW) wire.
4. The recommended power lead wire sizes are based on an ambient temperature of 86°F
(30°C). Ampacity correction factors must be applied for other ambient temperatures.
Refer to the National Electrical Code Handbook.
5. The recommended fuse size or HACR circuit breaker size is equal to 150% of the
largest compressor motor RLA plus 100% of the remaining compressor RLA.
6. The maximum fuse size or HACR circuit breaker size is equal to 225% of the largest
compressor motor RLA plus 100% of the remaining compressor RLA.
7. Must be electrically grounded according to national and local electrical codes.
Power Limitations:
1. Voltage within  10 percent of nameplate rating.
2. Voltage unbalance not to exceed 2% with a resultant current unbalance of 6 to 10 times
the voltage unbalance per NEMA MG-1, 1998 Standard. This is an important
requirement and must be adhered to.
Notes for “Electrical Data”
1. Requires a disconnect switch per circuit to supply electrical power to the unit. If field
supplied, this power supply must either be fused or use an HACR type circuit breaker.
2. Use copper wiring to unit power block or optional non-fused disconnect switch.
3. All field wire size values given in table apply to 75°C rated wire per NEC.
Notes for Wiring Diagram
Remote Condenser Units
On remote condenser units, head pressure control by cycling fans can be accomplished
several ways. The MicroTech II controller in the unit can be used. It senses discharge
pressure and will stage up to 6 condenser fans when wired in accordance with Figure 16 on
page 39. If the condenser has more than 6 fans, 2 can be operated on a step. For example, a
condenser with 10 fans would have 2 fans on steps #1 through #4 and one fan each on steps
#5 and #6. Condensers with less than 6 fans would use the appropriate MicroTech II steps
beginning with #1.
Wire so that the first-on, last-off fan stage has one fan on it.
The Daikin ACD condensers have unit-mounted and wired single fan motor VFD combined
with fan cycling by pressure switches for the balance of the fans available as an option.
They can be used for staging fans instead of the WGS MicroTech II controller.
See Ambient Air Sensor note on page 29.
Circuit Breakers
The circuit breaker used in the High Short Circuit panel option may have a higher trip
rating than the unit Maximum Overload Protection (MOP) value shown on the unit
nameplate. The circuit breaker is installed as a service disconnect switch and does not
function as branch circuit protection, mainly that the protection device must be installed at
the point of origin of the power wiring. The breaker (disconnect switch) is oversized to
avoid nuisance trips at high ambient temperature conditions.
40
WGS 130A to 190A
IMM1157-1
Figure 17, Schematic Diagram Legend
Designation
IMM1157-1
Description
Standard
Location
Designation
Description
Standard
Location
ABR
Alarm Bell Relay
Field Mounted
M12
Tower Fan 1
Field Mounted
BB
Bias Block
Outer Panel
PB1 / 2
Power Block
Inner Panel
CB1 / 2
Circuit Breaker
Inner Panel
REC
115V Outlet (Optional)
Outer Panel
CB11 / 211
Circuit Controller
Output Breaker
Output Panel
RS1
Remote Stop Switch
Field Mounted
CB12 / 22
Circuit Controller
Compr. Heater
Output Panel
S1
System Shut-Off Switch
Outer Panel
CHW1
Chilled Water Flow
Switch
Field Mounted
S01
Suction Pressure
Compressor
CHWR
Chilled Water Relay
Field Mounted
S02
Discharge Pressure
Compressor
CWR
Cond. Water Relay
Field Mounted
S03
Liquid Pressure
Liquid Line
CWI
Cond. Water Flow
Switch
Field Mounted
S04
Suction Temperature
Compressor
Cir. Contr. 1 /
2
Circuit Controller
Outer Panel
S05
Discharge Temperature
Compressor
Compr 1 / 2
Compressors
Behind Control
Box
S06
Liquid Temperature
Liquid Line
DS ½
Disconnect Switch
Inner Panel
S07
Outside Ambient
Temperature
Behind Control
Box
FU4
T1 Primary Fuse
Inner Panel
S08
Leaving Water Sensor
Leaving Water
Nozzle
FU5
T1 Primary Fuse
Inner Panel
S09
Entering Water
Temperature
Entering Water
Nozzle
FU6
T1 Secondary Fuse
Inner Panel
S10
Demand Limit Reset
Field Mounted
FU7
T1 Secondary Fuse
Inner Panel
S11
Leaving Water Reset
Field Mounted
F3
115v Outlet Fuse
(Optional)
Cir. #2 Outer
Panel
CS
Circuit System Switch
Outer Panel
GRD
Ground
Inner Panel
Load/Unload
Load/Unload Solenoid
Compressor
Htr-Compr
Compressor Heater
Compressor
T1
Control Transformer
Inner Panel
Outer Panel
MHP
High Pressure Switch
Compressor
T2
Unit Contr. 24V
Transformer
MHPR
Mechanical High
Pressure Relay
Outer Panel
T13 / T23
Circuit Contr. 24V
Transformer
Outer Panel
MS1
Mode Switch
Field Mounted
T14 / T24
Comp. Load/Unload 24V
Transformer
Outer Panel
SSS ½
Comp. Solid State
Starter
Inner Panel
T15 / T25
EXV Driver 24V
Transformer
Outer Panel
MJ
Mechanical Jumper
Control Box
TB1 – TB2
Terminal Blocks
Outer Panel
M11
Tower Fan 2
Field Mounted
WJ
Wire Jumper
Control Box
WGS 130A to 190A
41
Figure 18, WGS 130 - 190, Circuit Controller Schematic Wiring Diagram
(SEE LINE 693)
TO T15
116
114
1
T13
120V
2
5
24V
6
113
20
40
120
121
139
(SEE LINE 687)
MJ
MJ
40
123
122
GO
J1
G
EVAP PRESS TRANSDUCER (S01)
0-5 VDC
RED
WHT
BLK
0-5 VDC
RED
WHT
BLK
J1
CONDENSER PRESS TRANSDUCER (S02)
J2
J2
J3
BIAS 5
BIAS 6
SLIDE LOAD
INDICATOR
21 VDC
DC GROUND
1
2
25
26
882
883
3
137
138
3
J4
1
J5
1
J11
SUCTION TEMP. (S04)
DISCHARGE TEMP. (S05)
BLK
RED
B120
OHMS
B4
BC4
B5 J3
BC5
BLK
RED
A+
GND
PE
SHIELD
124
VG
125
VGD
C1
Y1
J4
Y2
0-10VDC
EXV DRIVER
126
NO1
Y3
(SEE DETAIL 1)
J12
Y4
D3
SA-
BLACK
SB+
WHITE
A+
GREEN
B-
SCOM
SHLD
GND
NO2
NO3
C1
CIRCUIT SWITCH
127
128
WJ
ID1
CS
ID2
C4
ID3
NO4
FLT
STARTER FAULT
164
165
TB1-6
TB1-7
PE
GRN
DIFFERENTIAL PRESSURE SWITCH
J5
DPS
BLK
WHT
C
21
129
ID5
131
ID6
1
MHPR
MECHANICAL HIGH PRESSURE FAULT
130
2
4
ID7
ID8
132
IDC1
D I GIT A L O UT P U T S
ID4
J13
NO5
NO6
C4
C7
J14
NO7
B6
C7
B7
NO8
MJ
SLIDE LOAD
INDICATOR
MJ
24
4-20MA
3
133
J6
CONDENSER LEAVING WATER TEMP. (S12)
BLK
RED
J15
B8
134
GND
NC8
22
3
20
2
PE
135
C8
ID9
C9
ID10
NO9
OLS
1
GREEN
J16
COMPRESSOR
SSS CONTACT
NO10
ID11 J7
NO11
DETAIL 2 - THERMISTOR CARD
136
IDC9
NO12
J3-2
1
ID13H
2
J17
ID13
LP*
REMOTE EVAP. ONLY.
IN SERIES WITH 170
IDC13
ID14
42
188
171
170
NOTES:
OIL SEP.
HEATER
C9
40
MOTOR
GUARDISTOR
J3-1
ID12
1) * - REPRESENTS CIRCUIT
2) ONE HUNDRED SERIES FOR CIRCUIT #1
3) TWO HUNDRED SERIES FOR CIRCUIT #2
WGS 130A to 190A
C12
NC12
J8
NO13
J18
ID14H
C13
NC13
(LOWER LEVEL)
CONTROLLER
IMM1157-1
Schematic Wiring Diagram (Continued)
LINE
NO.
-601
-602
-603
TB1
1
105, 114, 116, 160
-604
-605
1
2
180
-606
-607
2
2
101, 113, 117,183
161, 187
177
-608
-609
3
4
181, MHP-1
182, 184, MHP-2
-610
-611
20
20
122, 124
127, BLK, 130, 2-OIL
-612
-613
21
22
WHT, 129
3-OIL, 135
-614
-615
24
25
3-SLIDE, 133
-616
-617
26
27
-618
-619
28
30
172, 1-LOAD
173, 1-UNLOAD
176, 177
-620
-621
49
40
188, 189
123, 125
-622
-623
40
40
RED, 1-OIL, 136, 139
-624
-625
50
90
(RESISTOR USED ONLY AT END OF DAISY CHAIN)
-626
-627
91
92
93
144
146
WHITE
-628
-629
94
95
148
150
96
97
152
1
T1
115V
102
2
NB
103
FU7
105
1
101
(SEE LINE 694)
2
117
MJ
(p LAN) TO OTHER CIRCUIT CONTROLLERS AND UNIT CONTROLLER
BLACK
GROUND
-630
-631
(TERMINATE AT EACH CONTROLLER)
CB11
1
TERMINAL BLOCK
AND LEAD NUMBERS
MHP
3
180
-632
-633
MHPR
4
181
182
1
-634
-635
183
2
0
1
-636
-637
184
92
PE
PE
132, 134, RED
163, 2-LOAD, 2-UNLOAD, 190
170
171
154
GRN - OIL
GRN - DPS
GRN - LOAD
GRN - UNLOAD
-638
-639
98
144
PE
PE
1-SLIDE, 137
2-SLIDE, 138
M*1
-640
-641
93
M*2
146
-642
-643
94
148
-644
-645
M*3
-646
-647
-648
-649
-650
-651
95
150
-652
-653
-654
-655
M*4
96
152
M*5
-656
-657
97
154
M*6
REMOTE COND.
-658
-659
T14
1
120V
160
5
162
24V
161
-660
-661
163
-662
-663
2
6
-664
-665
-666
-667
PE
(SEE LINE 690)
185
27
172
1
-668
-669
GRN
1
2
SV
LOAD SOLENOID
-670
-671
2
-672
-673
PE
GRN
1
28
173
-674
-675
2
UNLOAD SOLENOID
1
SV
2
-676
-677
50
-678
-679
SSS RUN
186
K1
-680
-681
187
-682
-683
CB12
HTR-OIL SEP.
30
175
176
177
189
49
-684
-685
197
HEATER
1
2
INT
ANALOG OUTPUT J4-Y3
126
TB1-40 139
SV
BLACK
190
50
EXV
MOTOR
185
TO: TB1-1
1 5
120V
TO: TB1-2
117
-
PID
WHITE
GREEN
RED
116
191
+
195
+ 24V AC
196
- 24V AC
DETAIL 1
EXV
DRIVER
T15
2 6
PUMPDOWN
192
PUMPDOWN
-686
-687
-688
-689
-690
-691
-692
-693
-694
-695
-696
-697
-698
-699
-700
SCHEM. 330588401 REV. 0B
IMM1157-1
WGS 130A to 190A
43
Figure 19, WGS 130 - 190, Unit Controller Schematic Wiring Diagram
812
75
813
60
MJ
801
PE
802
GO
G
PE
J1
SHIELD
OUTSIDE AIR TEMP or COND. ENTERING WATER TEMP. (S07)
BLK
RED
B1
MJ
73
71
DEMAND LIMIT (S10)
4-20MA
70
72
EVAP. WATER TEMP. RESET (S11)
4-20MA
804
B2
806
B3
GND
805
J11
B-
70
814
J2
+VDC
A+
PE
SHIELD
GND
EVAP. LEAVING WATER TEMP (S08)
EVAP. ENTERING WATER TEMP (S09)
BLK
B4
RED
BC4
BLK
B5
RED
BC5
884
VG
885
VG0
887
Y1
889
Y2
J3
C1
NO1
COOLING TOWER BYPASS
886
COOLING TOWER VFD
888
77
(0-10VDC)
79
78
(0-10VDC)
80
J4
Y3
Y4
UNIT SWITCH
S1
807
808
ID1
809
ID2
810
ID3
811
ID4
D IG IT AL OU T P UT S
J12
NO3
C1
C4
NO4
J13
CHWI
RS1
NO5
NO6
897
REMOTE SWITCH
60
NO2
C4
66
EVAP. FLOW SWITCH
67
MS1
MODE SWITCH
C7
68
J14
CWI
COND. FLOW SWITCH
815
ID5
76
60
FACTORY
INSTALLED
FLOW
SWITCHES
BRN
WHT
67
C7
ID6
75
BLU
ID7
60
NO8
76
BRN
75
WHT
ID8
BLU
J15
WGS 130A to 190A
C8
NC8
IDC1
800
NOTE:
J2-B1 OUTSIDE AIR TEMP. IS FOR TGS UNITS ONLY AND
CONDENSER ENTERING WATER TEMP. IS FOR WGS UNITS ONLY.
44
NO7
J5
CONTROLLER
IMM1157-1
WGS 130 - 190, Unit Controller Schematic Wiring Diagram (Continued)
1
2
LINE
NO.
CONTACT
LOCATION
TERMINAL BLOCK
AND LEAD NUMBERS
-301
-302
FU12
890
115V OUTLET
B
1
REC
W
891
PE
G
2
1
820, 822, 890
-304
2
60
821, 891
801, 807, 884
60
60
897, 830
812
75
75
800, 885
802, 886
75
75
813, 888
-305
-306
-307
MJ
-308
-309
-310
-311
-312
820
1
LINE 1
T2
120V
2
24V
6
-313
LINE 2
-314
821
-315
5
LOAD 1
LOAD 2
-316
MJ
BIAS
BLOCK
-317
-318
-319
-
(p LAN) TO CIRCUIT CONTROL BOXES
BLACK
WHITE
GROUND
880
-320
TO UNIT CONTROLLER B-
-321
+
881
TO UNIT CONTROLLER A+
5
882
TO CIRCUIT CONTROLLER J4
G
883 TO CIRCUIT CONTROLLER J4
-322
-323
-324
(TERMINATE AT EACH CONTROLLER)
-325
-326
-327
1
822
SEE LINE 301
-328
-329
EVAPORATOR PUMP 1
82
2
120V
CHWR
823
-330
-331
EVAPORATOR PUMP 2
85
120V
-332
CHWR
824
-333
COND. PUMP 1
86
120V
825
TB1
-303
60
60
2
2
2
66
897, 809
67
68
70
810
811
70
71
806
804
72
73
805
814
76
77
815
886
78
79
887
888
80
889
81
82
83
829
823
84
85
86
824
825
87
88
89
826
827
828
-334
CWR
-335
-336
-337
WJ
-338
-339
-340
COND. PUMP 2
87
120V
826
-341
CWR
-342
TOWER FAN 1
120V
88
TOWER FAN 2
TB1-89 ARE
FIELD
WIRING
TERMINALS.
-343
M11
827
NOTE:
TB1-75 THRU
-344
120V
89
-345
M12
828
-346
-347
-348
-349
-350
-351
-352
-353
-354
-355
-356
UNIT ALARM
81
75
829
ABR
-358
LINE 306
-359
60
830
-357
SEE
SEE LINE 307
-360
-361
-362
-363
-364
-365
SCHEM. 330588301 REV. 0B
IMM1157-1
WGS 130A to 190A
45
Control Panel Layout
Figure 20, Outer (Microprocessor) Panel
T2, Unit Controller
T13, Circ#1 Controller
T14, Circ#1 Load Solenoid
T15, Circ#1 EXV Power
T23, Circ#2 Controller
T24, Circ#2 Load Solenoid
T25, Circ#2 EXV Power
Unit Controller
MHPR11 &12, Mechanical
High Pressure Relay
Circ#1 Controller
Circuit Breaker &
Switch Panel
External Disconnect Handle
Circ#1 & 2 EXV Drivers
Circ#2 Controller
TB3, Circ#2 Controller
Terminal Board
TB2Circ#1 Controller
Terminal Board
TB1 Unit Controller
Terminal Board
NOTES:
1.
2.
3.
46
Transformers T2 through T25 are class 100, 120V to 12V.
Switches for MHPR 11 and 12 (Mechanical High Pressure Switches) are located on the compressors.
Mechanical High Pressure Switches Open at 310 psi, Close at 250 psi
WGS 130A to 190A
IMM1157-1
Figure 21, Inner (Power) Panel
Circ#1 Solid State Starter
Circ#2 Solid State Starter
SSS1 Bypass Contactor
SSS2 Bypass Contactor
Secondary Fuses
External Disconnect
Handle
Circ#1 Circuit Breaker
Circ#2 Circuit Breaker
Unit Disconnect Switch
W/ External Handle
T1, Supply Voltage to
120V Transformer
Primary Fuses
Outside (Microprocessor) Panel
IMM1157-1
WGS 130A to 190A
47
Figure 22, Circuit Breaker/Fuse Panel
Open Location
S1 Main Unit On-Off Switch
CS2, Circuit#2 On-Off Switch
CS1, Circuit#1 On-Off Switch
CB11 Circ#1 Circuit Breaker
CB12, Circ#1 Sump Heater
Open Location
CB21, Circ#2 Circuit
Breaker
CB22, Circ#2 Sump Heater
Open Locations
Location for Optional
115V Receptacle
Figure 23, Inner and Outer Panel Diagrams
OUTER PANEL
T2
T13
T14
T15
INNER PANEL
T23
T24
T25
MHPR
1
MHPR
2
SINGLE
POINT
OR
CIR. #1
DS
HANDLE
(MULTIPOINT)
SSS #1
D3
CONTR.
BRD.
UNIT
CONTROLLER
EXV.
DRIVER
#1
S
1
D3
CONTR.
BRD.
THERMISTOR
CARD
BYPASS
CONTACTOR
CS2
CS1
SSS #2
S
P
CT3
THERMISTOR
CARD
BYPASS
CONTACTOR
CT1
CT3
CT2
CT1
CT2
CB11
CB12
CIRCUIT CONTROLLER
#1
SP
CB21
CB22
MODBUS CARD
SP
CONVERTER BOARD
CIR. #2
DS
HANDLE
(MULTIPOINT)
F
U
6
FU7
F3
EXV.
DRIVER
#2
T1
C
B
1
C
B
2
DS1
CIRCUIT CONTROLLER
#2
TB1
TB11
REC
OPTION
F
U
4
F
U
5
(DS1 DS2
MULTIPOINT
POWER)
G
N
D
TB21
330589001 REV. 00 - Legend
48
WGS 130A to 190A
IMM1157-1
Sequence of Operation
Compressor Heaters
With the control power on, 120V power is applied through the control circuit Fuse FU7 to
the compressor oil separator heater(HTR-OIL SEP).
Startup/Compressor Staging
During cool mode the following must be true to start a circuit operating. The evaporator
and condenser pump outputs must be energized and flow must be established for a period of
time defined by the evaporator recirculate setpoint. Established flow will be detected by
evaporator and condenser water flow switches. The water temperature leaving the
evaporator must be greater than the Active Leaving Water Temperature setpoint, plus the
Startup Delta-T, before a circuit will start. The first circuit to start is determined by
sequence number. The lowest sequence numbered circuit will start first. If all sequence
numbers are the same (default), then the circuit with the fewest number of starts will start
first. During operation the slides for load and unload will be pulsed such that the active
leaving water temperature setpoint is maintained. The second circuit start will occur once
the first circuit has loaded to 75% slide capacity or is in Capacity Limit and the water
temperature leaving the evaporator is greater than the active leaving water temperature
Setpoint plus Stage Delta-T. The circuits will load or unload simultaneously through a
continuous capacity control to maintain the evaporator leaving water temperature. If all
sequence numbers are the same, the circuit with the most run hours will be shutdown first.
The circuit with the most run hours will stop when the water temperature leaving the
evaporator is less than the Active Leaving Water Temperature Setpoint minus Stage
Delta-T. The last remaining circuit will shutdown when the water temperature leaving the
evaporator is greater than the Active Leaving Water Temperature Setpoint minus the Stop
Delta-T.
Automatic Pumpdown
The WGS has separate refrigerant circuits so the refrigerant charge is stored in the
condenser when the circuit is off. Pumpdown to the condenser helps keep refrigerant from
migrating to the compressor. It also helps establish a pressure differential on start for oil
flow. In a normal shutdown, each circuit will close its expansion valve, causing the
evaporator pressure to reach a low-pressure setpoint. Once this setpoint is reached, or a
specified amount of time has elapsed, the running circuit will be shut down.
Chilled Water and Condenser Water Pumps
The chiller’s MicroTech II controller has a total of four pump outputs, two for the
evaporator and two for the condenser. There is a manual setting in the software for the user
to select either pump output 1 or 2. It is recommended that the chiller’s outputs control the
water pumps, as this will offer the most protection for the unit.
Cooling Tower Control
The MicroTech II controller can control the cooling tower fans and/or a tower bypass valve.
This provides a simple and direct method to control the unit’s discharge pressure.
Programming directions and the sequence of operation can be found in the MicroTech II
manual. Some means of discharge pressure control must be installed if the condenser water
temperature can fall below the values shown on page Error! Bookmark not defined..
Condenser Fan Control
The MicroTech II controller can be programmed to cycle on and off condenser fans based
on the discharge pressure. Details are in the MicroTech II manual.
IMM1157-1
WGS 130A to 190A
49
Start-Up and Shutdown
Pre Start-up
1. Flush and clean the chilled-water system. Proper water treatment is required to prevent
corrosion and organic growth.
2. With the main disconnect open, check all electrical connections in control panel and
starter to be sure they are tight and provide good electrical contact. Although
connections are tightened at the factory, they can loosen enough in shipment to cause a
malfunction.
3. Check and inspect all water piping. Make sure flow direction is correct and piping is
made to correct connection on evaporator and condenser.
4. Open all water flow valves to the condenser and evaporator.
5. Flush the cooling tower and system piping to be sure the system is clean. Start
evaporator pump and manually start condenser pump and cooling tower. Check all
piping for leaks. Vent the air from the evaporator and condenser water circuit, as well
as from the entire water system. The cooler circuit should contain clean, treated, noncorrosive water.
6. Check to see that the evaporator water temperature sensor is securely installed.
7. Make sure the unit control switch S1 is open (off) and the circuit switches CS1 and
CS2 are open. Place the main power disconnect switch to “on.” This will energize the
compressor sump heaters. Wait a minimum of 12 hours before starting the unit.
8. Measure the water pressure drop across the evaporator and condenser, and check that
water flow is correct (on pages 16 and 17) per the design flow rates.
9. Check the actual line voltage to the unit to make sure it is the same as called for on the
compressor nameplate, within + 10%, and that phase voltage unbalance does not
exceed 2%. Verify that adequate power supply and capacity is available to handle load.
10. Make sure all wiring and fuses are of the proper size. Also make sure that all interlock
wiring is completed per Daikin Applied diagrams.
11. Verify that all mechanical and electrical inspections by code authorities have been
completed.
12. Make sure all auxiliary load and control equipment is operative and that an adequate
cooling load is available for initial start-up.
Start-up
1. Open the compressor discharge shutoff valves until backseated. Always replace valve
seal caps.
2. Open the two manual liquid line shutoff valves (king valves).
3. Verify that the compressor sump heaters have operated for at least 12 hours prior to
start-up. Crankcase should be warm to the touch.
4. Check that the MicroTech II controller is set to the desired chilled water temperature.
5. Start the system auxiliary equipment for the installation by turning on the time clock,
ambient thermostat and/or remote on/off switch and water pumps.
6. Switch on the unit circuit breakers.
7. Set circuit switches CS1 and CS2 to ON for normal operation.
8. Start the system by setting the unit system switch S1 to ON.
9. After running the unit for a short time, check the oil level in each compressor, rotation
of condenser fans (if any), and check for flashing in the refrigerant sight glass.
50
WGS 130A to 190A
IMM1157-1
Weekend or Temporary Shutdown
Move circuit switches CS1 and CS2 to the off pumpdown position. After the compressors
have shut off, turn off the chilled water pump if not on automatic control from the chiller
controller or building automation system (BAS). With the unit in this condition, it will not
restart until these switches are turned back on.
Power to the unit (disconnect closed) so that the sump heaters will remain energized.
Start-up after Temporary Shutdown
1. Start the water pumps.
2. Check compressor sump heaters. Compressors should be warm to the touch.
3. With the unit switch S1 in the “ON” position, move the circuit switches CS1 and CS2
to the ON position.
4. Observe the unit operation for a short time, noting unusual sounds or possible cycling
of compressors.
Extended Shutdown
1.
2.
3.
4.
5.
6.
Close the manual liquid line shutoff valves.
After the compressors have shut down, turn off the water pumps.
Turn off all power to the unit.
Move the unit control switch S1 to the “OFF” position.
Close the discharge shutoff valves.
Tag all opened disconnect switches to warn against start-up before opening the
compressor suction and discharge valves.
7. Drain all water from the unit evaporator, condenser and chilled water piping if the unit
is to be shut down during the winter and exposed to below-freezing temperatures. Do
not leave the vessels or piping open to the atmosphere over the shutdown period to help
prevent excessive corrosion.
Start-up after Extended Shutdown
1. Inspect all equipment to see that it is in satisfactory operating condition.
2. Remove all debris that has collected on the surface of the condenser coils (remote
condenser models) or check the cooling tower, if present.
3. Open the compressor discharge valves until backseated. Always replace valve seal caps.
4. Open the manual liquid line shutoff valves.
5. Check circuit breakers. They must be in the “OFF” position.
6. Check to see that the circuit switches CS1 and CS2 and the unit control switch S1 are in
the “OFF” position.
7. Close the main power disconnect switch. The circuit disconnects switches should be
off.
8. Allow the sump heaters to operate for at least 12 hours prior to start-up.
9. Start the chilled water pump and purge the water piping as well as the evaporator in the
unit.
10. Start the system auxiliary equipment for the installation by turning on the time clock,
ambient thermostat and/or remote on/off switch.
11. Check that the MicroTech II controller is set to the desired chilled water temperature.
12. Switch the unit circuit breakers to “ON.”
13. Start the system by setting the system switch S1 and the circuit switches to “ON”.
IMM1157-1
WGS 130A to 190A
51
!
CAUTION
Most relays and terminals in the control center are powered when S1 is closed and the
control circuit disconnect is on. Therefore, do not close S1 until ready for start-up or serious
equipment damage can occur.
14. After running the unit for a short time, check the oil level in the compressor oil sight
glass and check the liquid line sight glass for bubbles.
System Maintenance
General
To provide smooth operation at peak capacity and to avoid damage to package components,
set and follow a program of periodic inspections. The following items are intended as a
guide to be used during inspection and must be combined with sound refrigeration and
electrical practices to help provide trouble-free performance.
The liquid line sight glass/moisture indicator on all circuits must be checked to be sure that
the glass is full and clear and that the moisture indicator indicates a dry condition. If the
indicator shows that a wet condition exists or if bubbles show in the glass, even with a full
refrigerant charge, the filter-drier element must be changed.
Water supplies in some areas can foul the water-cooled condenser to the point where
cleaning is necessary. The fouled condenser will be indicated by an abnormally high
condenser approach temperature (saturated discharge temperature minus leaving condenser
water temperature) and can result in nuisance trip-outs. To clean the condenser, mechanical
cleaning or a chemical descaling solution should be used according to the manufacturer’s
directions.
Systems with remote air-cooled condensers require periodic cleaning of the finned surface
of the condenser coil. Cleaning can be accomplished by using a cold water spray, brushing,
vacuuming, or high-pressure air. Do not use tools that could damage the coil tubes or fins.
The compressor oil level must be checked periodically to be sure that the level is near the
center of the oil sight glass located on the compressor (see Figure 24). Low oil level can
cause inadequate lubrication and if oil must be added, use oils referred to in the following
“Compressor Lubrication” section.
A pressure tap has been provided on the liquid line downstream of the filter-drier and
solenoid valve but before the expansion valve. An accurate subcooled liquid pressure and
temperature can be taken here. The pressure read here could also provide an indication of
excessive pressure drop through the filter-drier and solenoid valve due to a clogging filterdrier. Note: A normal pressure drop through the solenoid valve is approximately 3 psig
(20.7 kPa) at full load conditions.
!
CAUTION
A blown fuse or tripped protector indicates a short ground or overload. Correct the problem
before replacing fuses or restarting compressor. The control panel must be serviced by a
trained and qualified technician. Improper service can damage equipment.
52
WGS 130A to 190A
IMM1157-1
!
CAUTION
The panel is always energized, even when the system switch is off. Pull the main unit
disconnect to de-energize the panel and crankcase heaters. Failure to do so can result in
severe personal injury or death. If motor or compressor damage is suspected, do not
restart until qualified service personnel have checked the unit.
Electrical Terminals
!
DANGER
To avoid severe injury or death from electric shock, turn off all power and lockout and tagout electric source before continuing with the following service. Note unit might be powered
from multiple sources.
POE Lubrication
POE type oil is used for compressor lubrication. This type of oil is extremely hygroscopic,
which means it will quickly absorb moisture if exposed to air and may form acids that can
be harmful to the chiller. Avoid prolonged exposure of POE oil to the atmosphere to prevent
this problem. For more details on acceptable oil types, contact your Daikin Applied service
representative.
!
CAUTION
POE oil must be handled carefully using proper protective equipment (gloves, eye
protection, etc). The oil must not come in contact with certain polymers (e.g. PVC), as it
may absorb moisture from this material. Also, do not use oil or refrigerant additives in the
system.
It is important that only the manufacturer’s recommended oils be used. Acceptable POE oil
types are:
 CPI/Lubrizol Emkarate RL68H
 Exxon/Mobil EAL Arctic 68
 Hatcol 3693
 Everest 68
No routine lubrication is required on WGS units.
Figure 24, Compressor Oil Filter
The Lub Control measures the pressure drop
across the lubricant filter and shuts off the
compressor if the differential pressure becomes
too high. It is reset through the circuit controller.
Change oil when pressure drop exceeds 15 psig.
Compressor Oil Filter
Lub Control
Oil Level Sight Glass
IMM1157-1
WGS 130A to 190A
53
Sight Glass and Moisture Indicator
The refrigerant sight glasses should be observed periodically. A monthly observation should
be adequate. A clear glass of liquid indicates that there is adequate refrigerant charge in the
system to provide proper feed through the expansion valve. The sight glass should be clear
when the ambient temperature is above 75F (23C) and all fans on a circuit are running,
when air cooled.
Bubbling refrigerant in the sight glass may occur at other conditions and may indicate that
the system is short of refrigerant charge. Refrigerant gas flashing in the sight glass could
also indicate an excessive pressure drop in the line, possibly due to a clogged filter-drier or
a restriction elsewhere in the system. An element inside the sight glass indicates what
moisture condition corresponds to a given element color. If the sight glass does not indicate
a dry condition after about 12 hours of operation, the unit should be pumped down and the
filter-driers changed.
If the system is suspected of being short of refrigerant, a qualified service technician with
EPA certification should be contacted to thoroughly check out the unit and add refrigerant if
necessary.
Sump Heaters
The compressors are equipped with sump lubricant heaters. The function of the heater is to
keep the temperature in the crankcase high enough to prevent refrigerant from migrating to
the crankcase and condensing in the lubricant during the off-cycle. When a system is to be
started up initially, the power to the heaters should be turned on for at least 12 hours before
the compressors are started. The sump should be up to about 80°F (26.7°C) before the
system is started up (warm to the touch), to minimize lubrication problems or liquid
slugging of compressor on start-up.
If the crankcase is cool (below 80°F) (26.7°C) and the oil level in the sight glass is full to
top, allow more time for oil to warm before starting the compressor.
The crankcase heaters are on whenever power is supplied to the unit and the compressor is
not running.
54
WGS 130A to 190A
IMM1157-1
Maintenance Schedule
I. Compressor
A. Performance Evaluation (Log & Analysis) *
B. Motor
 Meg. Windings
 Ampere Balance (within 10%)
 Terminal Check (tight connections, porcelain clean)
 Motor Cooling (check temperature)
C. Lubrication System
 Oil Level
 Oil Appearance (clear color, quantity)
 Oil change if indicated by oil analysis
II. Controls
A. Operating Controls
 Check Settings and Operation
B. Protective Controls
 Test Operation of:
Alarm Relay
Pump Interlocks
High and Low Pressure Cutouts
III. Condenser
B. Test Water Quality
C. Clean Condenser Tubes (or as required)
D. Eddy current Test - Tube Wall Thickness
E. Seasonal Protection
IV. Evaporator
B. Test Water Quality
C. Clean Evaporator Tubes (or as required)
D. Eddy current Test - Tube Wall thickness (or as required)
E. Seasonal Protection
V. Expansion Valves
A. Performance Evaluation (Superheat Control)
VI. Compressor - Chiller Unit
A. Performance Evaluation
B. Leak Test:
 Compressor Fittings and Terminal
 Piping Fittings
 Vessel Relief Valves
C. Vibration Isolation Test
D. General Appearance:
 Paint
 Insulation
VII. Starter(s)
A. Examine Contactors (hardware and operation)
B. Verify Overload Setting and Trip
C. Test Electrical Connections
Key: O = Performed by in-house personnel
IMM1157-1
O
X
X
X
X
O
O
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
O
X
X
X
X
X
X
X
X
X
X = Performed by service personnel
WGS 130A to 190A
55
System Service
DANGER
!
Service on this equipment must be performed by trained, experienced technicians. Causes
for repeated tripping of equipment protection controls must be investigated and corrected.
Disconnect all power (there may be multiple sources) before doing any service inside the
unit or severe personal injury or death can occur.
NOTE: Anyone servicing this equipment must comply with the requirements set
forth by the EPA concerning refrigerant reclamation and venting.
Filter-Driers
Figure 25, Filter-Drier Assembly
There is a filter-drier assembly for
each circuit located in the liquid line.
The cartridges should be changed
when the pressure drop across them
exceeds the values shown in Table
26 below, when measured at the
Schrader fittings before and after the
housing. To change the filter:
Expansion
Valve
Evaporator
Sensor
Schrader Fitting
Filter-Drier
Sight
Glass
Schrader
Fitting
Condenser
Liquid Line
Valve
Expansion
Valve
1. Shut off the circuit. This will
close the expansion valve.
2. Shut off the condenser liquid
shutoff valve, isolating the filterdrier.
3. Remove any remaining
refrigerant from one of the
Schrader valves using approved
EPA procedures.
4. Remove the housing
cover, after checking that there is no positive pressure in the filterEvaporator
drier.
5. ReplaceSensor
the filters, reinstall the cover, evacuate, and open the liquid line valve.
Table 26,Schrader
Liquid
Line Filter-Drier Pressure Drop
Fitting
PERCENT CIRCUIT
LOADING (%)
100%
75%
Sight
50%
Glass
25%
MAXIMUM RECOMMENDED PRESSURE
Schrader
DROP ACROSS FILTER
DRIER PSIG (KPA)
Fitting
7 (48.3)
Filter-Drier
5 (34.5)
3 (20.7)
Condenser
3 (20.7)
Liquid Line
Valve
56
WGS 130A to 190A
IMM1157-1
Electronic Expansion Valve
The electronic expansion valve is located in the liquid line entering the evaporator.
The expansion valve meters the amount of refrigerant entering the evaporator to match the
cooling load. It does this by maintaining constant condenser subcooling. (Subcooling is the
difference between the actual refrigerant temperature of the liquid as it leaves the condenser
and the saturation temperature corresponding to the condenser pressure.) All WGS chillers
are factory set at 20F subcooling at 100% slide position and 10F (12.2C) subcooling at
minimum slide position. These settings can be offset by discharge superheat.
When the control panel is first powered, the microprocessor will automatically step the
valve to the fully closed (shut) position and the indicator light on the EXV will show closed
position. The valve can also be heard closing as it goes through the steps. The valve will
take approximately 30 seconds to go from a full open position to a full closed position.
The position of the valve can be viewed at any time by using the MicroTech II controller
keypad through the View Refrigerant menus. There are 6386 steps between closed and full
open. There is also a sight glass on the EXV to observe valve movement.
If the problem can be traced to the power element only, it can be unscrewed from the valve
body without removing the valve, but only after pumping the unit down.
Evaporator
The evaporator is a shell-and-tube unit. Normally no service work is required on the
evaporator.
Water-cooled Condenser
The condensers are of the shell-and-tube type with water flowing through the tubes and
refrigerant in the shell. External finned copper tubes are rolled into steel tube sheets.
Integral subcoolers are incorporated on all units. All condensers are equipped with 350 psig
(2413 kPa) relief valves. Normal tube cleaning procedures can be followed.
IMM1157-1
WGS 130A to 190A
57
Troubleshooting Chart
PROBLEM
1.
2.
3.
Compressor Will
Not Run
Compressor
Noisy or Vibrating
3.
6.
7.
8.
No cooling required.
Liquid line solenoid will not open.
Motor electrical trouble.
6.
7.
8.
9.
Loose wiring.
9.
1.
Flooding of refrigerant into compressor.
1.
2.
Improper piping support on suction or
liquid line.
Worn compressor.
Condenser water insufficient or
temperature too high.
2.
2.
3.
4.
5.
6.
Fouled condenser tubes (water-cooled
condenser). Clogged spray nozzles
(evaporative condenser). Dirty tube and
fin surface (air cooled condenser).
Noncondensables in system.
System overcharge with refrigerant.
Discharge shutoff valve partially closed.
Condenser undersized (air-cooled).
7.
High ambient conditions (air-cooled).
7.
1.
2.
3.
Faulty condenser temp. regulation.
Insufficient refrigerant in system.
Low suction pressure.
1.
2.
3.
4.
Condenser too large.
4.
5.
Low ambient conditions (air-cooled)
5.
1.
Excessive load.
1.
2.
1.
2.
3.
4.
Expansion valve overfeeding.
Lack of refrigerant.
Evaporator dirty.
Clogged liquid line filter-drier.
Expansion valve malfunctioning.
2.
1.
2.
3.
4.
5.
Condensing temperature too low.
5.
6.
Compressor will not unload.
6.
7.
1.
2.
Insufficient water flow.
Clogged suction oil strainer.
Excessive liquid in crankcase.
7.
1.
2.
3.
4.
Low oil level.
Flooding of refrigerant into crankcase.
3.
4.
4.
5.
2.
Low Discharge
Pressure
High Suction
Pressure
Low Suction
Pressure
1.
2.
Thermal overloads tripped or fuses
blown.
Defective contactor or coil.
System shut down by equipment
protection devices.
3.
1.
High Discharge
Pressure
POSSIBLE CAUSES
Main switch, circuit breakers open.
Fuse blown.
4.
5.
3.
1.
3.
4.
5.
6.
Little or No Oil
Pressure
58
WGS 130A to 190A
POSSIBLE CORRECTIVE STEPS
Close switch
Check electrical circuits and motor
winding for shorts or grounds.
Investigate for possible overloading.
Replace fuse or reset breakers after
fault is corrected.
Overloads are auto reset. Check unit
closely when unit comes back on line.
Repair or replace.
Determine type and cause of shutdown
and correct it before resetting protection
switch.
None. Wait until unit calls for cooling.
Repair or replace coil.
Check motor for opens, short circuit, or
burnout.
Check all wire junctions. Tighten all
terminal screws.
Check superheat setting of expansion
valve.
Relocate, add or remove hangers.
Replace.
Readjust temperature control or water
regulating valve. Investigate ways to
increase water supply.
Clean.
EPA purge the noncondensables.
Remove excess refrigerant.
Open valve.
Check condenser rating tables against
the operation.
Check condenser rating tables against
the operation.
Check condenser control operation.
Check for leaks. Repair and add charge.
See corrective steps for low suction
pressure below.
Check condenser rating table against the
operation.
Check condenser rating tables against
the operation.
Reduce load or add additional
equipment.
Check remote bulb. Regulate superheat.
Check for leaks. Repair and add charge.
Clean chemically.
Replace cartridge(s).
Check and reset for proper superheat.
Replace if necessary.
Check means for regulating condensing
temperature.
See corrective steps for failure of
compressor to unload.
Adjust flow.
Clean.
Check sump heater. Reset expansion
valve for higher superheat. Check liquid
line solenoid valve operation.
Add oil.
Adjust expansion valve.
IMM1157-1
PROBLEM
Compressor
Loses Oil
Motor Overload
Relays or Circuit
Breakers Open
Compressor
Thermal Switch
Open
Freeze Protection
Opens
IMM1157-1
1.
POSSIBLE CAUSES
Lack of refrigerant.
1.
2.
3.
Velocity in risers too low (A-C only).
Oil trapped in line.
2.
3.
1.
Low voltage during high load conditions.
1.
2.
Defective or grounded wiring in motor or
power circuits.
Loose power wiring.
High condensing temperature.
2.
5.
Power line fault causing unbalanced
voltage.
5.
6.
6.
1.
High ambient temperature around the
overload relay
Operating beyond design conditions.
2.
1.
2.
3.
Discharge valve partially shut.
Thermostat set too low.
Low water flow.
Low suction pressure.
2.
1.
2.
3.
3.
4.
WGS 130A to 190A
3.
4.
1.
POSSIBLE CORRECTIVE STEPS
Check for leaks and repair. Add
refrigerant.
Check riser sizes.
Check pitch of lines and refrigerant
velocities.
Check supply voltage for excessive line
drop.
Replace compressor-motor.
Check all connections and tighten.
See corrective steps for high discharge
pressure.
Check Supply voltage. Notify power
company. Do not start until fault is
corrected.
Provide ventilation to reduce heat.
Add facilities so that conditions are within
allowable limits.
Open valve.
Reset to 42°F (6°C) or above.
Adjust flow.
See “Low Suction Pressure.”
59
Daikin Training and Development
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should be a high priority. For training information on all Daikin Applied HVAC products, please visit
us at www.DaikinApplied.com and click on Training, or call 540-248-9646 and ask for the Training
Department.
Warranty
All Daikin Applied equipment is sold pursuant to its standard terms and conditions of sale,
including Limited Product Warranty. Consult your local Daikin Applied representative for warranty
details. To find your local Daikin Applied representative, go to www.DaikinApplied.com.
Aftermarket Services
To find your local parts office, visit www.DaikinApplied.com or call 800-37PARTS (800-377-2787).
To find your local service office, visit www.DaikinApplied.com or call 800-432-1342.
This document contains the most current product information as of this printing. For the most upto-date product information, please go to www.DaikinApplied.com.
Products manufactured in an ISO Certified Facility.
IMM 1157-1 (09/14)
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