DUAL-TEC™ WALL-MOUNT™
Air Conditioners with -48VDC Blower Motor
DC Voltage 100% Free Cooling Unit
D28A/L to D60A/L
1-Stage
Right & Left-Hand Control Panel
Green Refrigerant
R-410A
The Bard DUAL-TEC™ Wall Mount™ Air Conditioners with -48VDC Blower Motor and DC Voltage
Free Cooling Economizer are designed for maximum indoor cooling at the most efficient operating
cost for year-round operation in the demanding equipment shelter environment.
The DUAL-TEC™ units operate on both AC and -48VDC positive ground power under normal power
supply conditions. If there is loss of AC power supply (shore &/or back-up generator) the DUAL-TEC™
will continue to operate as free-cooling or ventilation system using the shelter’s DC power. The
DUAL-TEC™ indoor blower and economizer operate from -48VDC and no inverter is required.
The DUAL-TEC™ units will supply up to 100% of rated cooling airflow in free cooling mode with the ability
to exhaust the same amount through the unit itself without any additional relief openings in the shelter.
DUAL-TEC™ Special Features
Brushless -48VDC Indoor Blower Motor:
100% Free Cooling Unit Ventilator:
DC Polarity Monitor:
PLC Logic Board:
Features low sound levels and soft-start capabilities.
Soft start function helps to ensure DC power levels will
not decrease on start up, and brushless design ensures
low DC power noise. The motor is self-adjusting to
provide the proper airflow rate without user adjustment
or wiring changes.
Includes diagnostics and protects critical DC
components against reverse polarity and out-of-range
DC power. Range is 40-60 VDC.
Remote Monitoring:
All units are equipped with a full-flow free cooling
ventilator. The ventilator uses DC power for operation
in conjunction with the -48VDC Indoor Blower during
AC power loss. Modulating air intake allows precision
temperature control inside the structure while
maximizing energy savings.
All units are equipped with a PLC Logic Board for
advanced unit operation and alarm capability. The PLC
Logic Board allows for “orphan mode” unit operation if
communication with the LC controller is lost
Bard DUAL-TEC™
Bard-Link™ web interface with use of LC Controller
Standard Engineered Features — All Models
Copper Tube / Aluminum Fin Coils:
Grooved copper tubing and enhanced
aluminum fins provide maximum heat
transfer and high energy efficiency.
Evaporator coil constructed with
hydrophilic fin stock that seals fin
surface against aluminum oxide
formation, is resistant to mold and
mildew growth (tested to ASTM D3273,
no growth) and reduces beading of
condensate on the fin surface. Optional
phenolic-coated coils are also available.
Extreme Outdoor Temperature
Rating:
PTCR Motor Starting Device:
Standard on 1-phase models, increases
compressor motor starting torque
2-3 times. Optional factory or field
installed hard start kit available,
replaces PTCR device.
Galvanized 20 Gauge Zinc Coated
Steel Cabinet:
Cleaned, rinsed, sealed and dried
before the polyurethane primer is
applied. The cabinet is handsomely
finished with a baked on textured
enamel, which allows it to withstand
1000 hours of salt spray tests per
ASTM B117-03.
D36A/L & D42A/L units are rated up
to 131°F outdoor ambient temperature
Foil Faced Insulation:
operation.
Standard on all units.
Air Conditioner Compressor:
Scroll compressors are designed for
increased efficiency, quieter operation
and improved reliability for longer life.
R-410A Refrigerant:
Designed with R-410A (HFC)
non-ozone depleting refrigerant in
compliance with the Montreal protocol
and 2010 EPA requirements.
•
•
•
•
Full Length Mounting Brackets:
Built into cabinet for improved
appearance and easy installation.
NOTE: Bottom mounting bracket
included to assist in installation.
Liquid Line Filter Drier:
Electric Heat Strips:
Features an automatic limit and
thermal cut-off safety control.
Heater packages are factory installed
for all 2½ through 5 ton models.
Two-Inch, MERV 8 Air Filters:
Are standard equipment. All models
include tight-sealing U-channel filter
bracket to minimize air bypass around
the filter.
Built-In Circuit Breakers:
HACR-type circuit breakers are
standard for AC power supply, and DC
rated circuit breaker used for -48VDC
power circuit.
Used with
LC Series Controller
High & Low Pressure Switches are
Auto-Reset:
Standard on all units. Built-in lock-out
circuit resets from the shelter BardLink™ Controller. Provides commercial
quality protection to the compressor.
Refrigerant Sight Glass:
Standard on all units.
Standard on all units. Protects system
Low Ambient Control:
against moisture.
Modulating LAC standard on all models.
Screw-on fitting design for ease of
24V Transformer:
service.
75VA with circuit breaker
Complies with efficiency requirements of ASHRAE/IESNA 90.1-2013.
Certified to ANSI/ARI Standard 390-2003 for SPVU (Single Package Vertical Units).
Intertek ETL Listed to Standard for Safety Heating and Cooling Equipment ANSI/UL
1995/CSA 22.2 No. 236-05, Fourth Edition.
Commercial Product - Not intended for Residential application.
Form No.
S3521-516
SupersedesS3521-116
Page
1 of 10
Capacity and Efficiency Ratings — 1-Stage Compressors
MODELS
Cooling Capacity BTUH 
EER 


D28A
D28L
D36A
D36L
D42A
D42L
D48A
D48L
D60A
D60L
28,600
36,000
41,500
47,000
57,000
11.5
11.5
11.0
10.5
10.0
Capacity is certified in accordance with ANSI/ARI Standard 390-2003.
Rating conditions are 95°F (35°C) outdoor and 80°F DB/67°F WB (26.5°C / 19.5°C WB) return air.
EER = Energy Efficiency Ratio (BTU / Watt Efficiency) is certified in accordance with ANSI/ARI Standard 390-2003. Includes DC watts for blower motor. Ratings are with no outside air. Performance will be affected by altitude.
Electrical Ratings — 1-Stage Compressor Models
MODELS
Electrical Rating – 60 Hz
Operating Voltage Range
DC Electrical Rating 
Operating Voltage Range
D28A2PA
D28L2PA
D28A2PB
D28L2PB
D36A2PA
D36L2PA
D36A2PB
D36L2PB
D42A2PA
D42L2PA
D42A2PB
D42L2PB
D48A2PA
D48L2PA
D48A2PB
D48L2PB
D60A2PA
D60L2PA
D60A2PB
D60L2PB
230/208-1 230/208-3 230/208-1 230/208-3 230/208-1 230/208-3 230/208-1 230/208-3 230/208-1 230/208-3
253-197
253-197
253-197
253-197
253-197
-48VDC
-48VDC
-48VDC
-48VDC
-48VDC
40 - 60 VDC
40 - 60 VDC
40 - 60 VDC
40 - 60 VDC
40 - 60 VDC
Compressor
Voltage
Rated Load Amps
Branch Circuit Selection Current
Lock Rotor Amps
230/208-1 230/208-3 230/208-1 230/208-3 230/208-1 230/208-3 230/208-1 230/208-3 230/208-1 230/208-3
8.3 / 9.3
5.4 / 6.1 11.6 / 12.9 7.4 / 8.2 15.1 / 16.7 11.5 / 12.6 16.3 / 18.2 10.1 / 11.5 21.0 / 23.8 13.9 / 15.8
12.9
8.4
16.7
10.5
18
13.5
21.8
13.8
26.3
15.8
64
58
79
73
112
88
117
83.1
134
110
Fan Motor
Fan Motor – HP
Volts
Full Load Amps
Fan – CFM
1/3
230/208-60-1
2.5
2400
1/3
230/208-60-1
2.5
2900
1/3
230/208-60-1
2.5
3300
1/3
230/208-60-1
2.5
3400
1/3
230/208-60-1
2.5
3400
3/4
-48VDC
14.0
3/4
-48VDC
14.0
3/4
-48VDC
14.0
3/4
-48VDC
14.0
3/4
-48VDC
14.0
550
565
565
630
635
DC Blower Motor
Blower Motor – HP
Volts 
Blower Motor – Full Load Amps
Shipping Weight (Lbs.)
 Neg. 48VDC positive ground.
Unit Charge Rates
UNIT
Std. Unit - Lbs.
Dehum. Units - Lbs.
D28A2P/D28L2P - DUAL-TEC™ -48VDC Right & Left Hand Free Cooling
6.3125
N/A
D36A2P/D36L2P - DUAL-TEC™ -48VDC Right & Left Hand Free Cooling
9.375
N/A
D42A2P/D42L2P - DUAL-TEC™ -48VDC Right & Left Hand Free Cooling
11.875
N/A
D48A2P/D48L2P - DUAL-TEC™ -48VDC Right & Left Hand Free Cooling
12.00
N/A
D60A2P/D60L2P - DUAL-TEC™ -48VDC Right & Left Hand Free Cooling
11.4375
N/A
DC Free Cooling Unit Ventilator
DC Powered Free Cooling Ventilator:
The DUAL-TEC™ free cooling ventilator allows for cooling operation
when outdoor temperature conditions are acceptable outside the building
structure. By using a modulating motor controlled by the PLC Logic Board,
the ventilator allows for filtered outdoor air to enter the structure and
provide cooling with minimal energy usage. The ventilator has the following
features:
• Defaults to temperature only, with optional humidity sensing.
• Exhaust air passage maintain a slight positive indoor air pressure.
• Easily serviceable, modulating DC powered vent motor.
• Large air intake passages for increased efficiency.
• Advanced blade sealing for minimal air infiltration when closed.
• Intake air filter.
• Advanced PLC algorithmic operation.
• Outdoor air temperature and enthalpy sensor.
• Return air temperature sensor.
Form No. S3521-516
SupersedesS3521-116
Page
2 of 10
SUMMARY ELECTRICAL RATINGS
1-Stage Compressor Models
AC Power Circuit
DC Positive Ground Power Circuit
Rated Volts,
Hertz & Phase
Minimum
Circuit
Ampacity
Maximum
External
Fuse or Ckt.
Brkr.
D28A2PA05 / D28L2PA05
208/230-60-1
26
30
10
15.6
20
12
D28A2PB06 / D28L2PB06
208/230-60-3
18
20
12
15.6
20
12
D36A2PA05 / D36L2PA05
208/230-60-1
26
40
8
15.6
20
12
D36A2PB06 / D36L2PB06
208/230-60-3
18
25
10
15.6
20
12
D42A2PA05 / D42L2PA05
208/230-60-1
26
40
8
15.6
20
12
D42A2PB06 / D42L2PB06
208/230-60-3
20
25
10
15.6
20
12
D48A2PA05 / D48L2PA05
208/230-60-1
30
50
8
15.6
20
12
D48A2PB06 / D48L2PB06
208/230-60-3
20
30
10
15.6
20
12
D60A2PA05 / D60L2PA05
208/230-60-1
36
60
6
15.6
20
12
D60A2PB06 / D60L2PB06
208/230-60-3
23
35
8
15.6
20
12
MODEL
Field Power
Wire Size
Minimum
Circuit
Ampacity
Maximum
External
Fuse or Ckt.
Breaker
Field Power
Wire Size
These “Minimum Circuit Ampacity” values are to be used for sizing the field power conductors. Refer to the National Electrical code (latest version), Article 310 for power conductor sizing.
Caution: When more than one field power circuit is run through one conduit, the conductors must be derated. Pay special attention to note 8 of Table 310 regarding Ampacity Adjustment Factors when more than three (3) current carrying conductors are in a raceway.
Maximum size of the time delay fuse or HACR type circuit breaker for protection of field wiring conductors.
Based on 75C copper wire. All wiring must conform to the National Electrical Code and all local codes.
IMPORTANT: While this electrical data is presented as a guide, it is important to electrically connect properly sized fuses & conductor wires in accordance with the National Electrical Code & all local codes.
Outdoor Sound Ratings — Cooling Mode
DISTANCE FROM HVAC UNIT
dBA
10 Feet
20 Feet
30 Feet
63.5
57.6
56.1
1. Values recorded in Bard Manufacturing Company, Inc. Sound Lab Facility.
2. Actual field results may vary with local conditions that can affect ambient background levels.
Cooling Application Data - Outdoor Temperature 
Model
D28A/L
D36A/L
D42A/L
D48A/L
D60A/L
Return Air
(DB/WB) Cooling Capacity

Total Cooling
75/62
Sensible Cooling
Total Cooling
80/67
Sensible Cooling
Total Cooling
85/72
Sensible Cooling
Total Cooling
75/62
Sensible Cooling
Total Cooling
80/67
Sensible Cooling
Total Cooling
85/72
Sensible Cooling
Total Cooling
75/62
Sensible Cooling
Total Cooling
80/67
Sensible Cooling
Total Cooling
85/72
Sensible Cooling
Total Cooling
75/62
Sensible Cooling
Total Cooling
80/67
Sensible Cooling
Total Cooling
85/72
Sensible Cooling
Total Cooling
75/62
Sensible Cooling
Total Cooling
80/67
Sensible Cooling
Total Cooling
85/72
Sensible Cooling
75°F
80°F
85°F
90°F
95°F
100°F
105°F
120°F
125°F
32,600
26,100
34,800
25,300
41,500
25,900
37,500
27,200
40,000
26,400
47,700
27,100
45,900
33,700
49,000
32,700
58,400
33,500
54,400
42,100
58,100
40,800
69,200
41,800
63,000
47,400
67,200
46,000
80,100
47,100
30,300
25,300
33,000
24,800
38,600
25,200
35,800
27,100
39,000
26,500
45,600
26,900
43,200
33,000
47,000
32,300
55,000
32,800
50,500
40,700
55,000
39,900
64,300
40,500
59,200
45,600
64,500
44,700
75,400
45,400
28,400
24,500
31,500
24,200
36,200
24,300
34,300
26,700
38,100
26,400
43,800
26,500
40,700
32,300
45,200
32,000
51,900
32,200
47,000
39,400
52,200
39,000
60,000
39,200
55,800
43,900
62,000
43,500
71,200
43,700
26,600
23,700
30,000
23,700
33,900
23,600
32,800
26,300
37,100
26,300
41,900
26,100
38,300
31,500
43,300
31,500
48,900
31,300
43,800
38,200
49,500
38,200
55,900
38,000
52,700
42,400
59,500
42,400
67,200
42,100
24,900
23,000
28,600
23,200
31,800
22,800
31,400
25,900
36,000
26,100
40,000
25,600
36,200
30,700
41,500
31,000
46,100
30,400
40,900
37,100
47,000
37,400
52,200
36,700
49,600
40,900
57,000
41,300
63,300
40,500
23,500
22,400
27,400
22,800
30,000
22,100
30,100
25,400
35,000
25,800
38,300
25,000
34,200
30,000
39,800
30,500
43,600
29,500
38,400
36,000
44,700
36,600
48,900
35,400
47,000
39,500
54,700
40,200
59,800
38,900
22,300 21,300 20,500 19,700
21,900 21,200 20,800 20,300
26,300 25,400 24,600 23,800
22,400 21,900 21,600 21,200
28,400 27,100 25,900 24,800
21,400 20,600 19,900 19,200
28,700 27,400 26,100 24,900
24,800 24,100 23,400 22,600
33,800 32,600 31,400 30,100
25,400 24,900 24,300 23,600
36,500 34,700 33,000 31,300
24,200 23,400 22,400 21,300
32,300 30,500 28,900 27,300
29,200 28,300 27,400 26,500
38,100 36,400 34,700 33,100
29,900 29,200 28,500 27,700
41,100 38,700 36,500 34,400
28,500 27,400 26,300 25,000
36,100 34,100 32,200 30,600
34,900 34,000 33,000 32,100
42,600 40,600 38,700 37,100
35,800 35,100 34,300 33,600
45,900 43,200 40,700 38,600
34,100 32,900 31,600 30,400
44,400 42,000 39,900 37,900
38,100 36,900 35,700 34,600
52,400 50,100 48,000 45,900
39,100 38,100 37,100 36,200
56,500 53,300 50,400 47,700
37,300 35,700 34,200 32,700
Capacity Multiplier Factors
% of Rated Airflow
-10
Rated
Total BTUH 0.975
1.0
Sensible BTUH 0.950
1.0
19,200
19,900
23,300
20,900
24,000
18,500
23,600
21,700
28,700
22,800
29,500
20,200
25,900
25,500
31,500
26,800
32,400
23,700
29,200
31,400
35,600
33,000
36,600
29,200
36,000
33,500
43,800
35,300
45,100
31,200
 Below 65°F (18.3C), unit requires a factory or field installed low ambient control.
 Return air temperature.
110°F
115°F
+10
1.02
1.05
Form No.
S3521-516
SupersedesS3521-116
Page
3 of 10
Indoor Blower Performance
Free Cooling
CFM below 40°

Rated Full Load
Cooling CFM

Electric Heat
Airflow
1800
800
1050
1800
1800
800
1100
1800
0.50
1800
950
1250
1800
0.20
0.50
1800
1100
1600
1800
0.20
0.50
1800
1100
1600
1800
MODEL
Rated ESP
MAX ESP
Free Cooling
CFM above 40°
D28A/D28L
0.15
0.50
D36A/D36L
0.15
0.50
D42A/D42L
0.20
D48A/D48L
D60A/D60L
Free Cooling Logic Control derives at this decision point, and switches the indoor motor speed. The damper actuator will then adjust to still yield a 55°F supply air temperature.
On single-stage models, this only occurs if you have a thermostat/controller with "Y2" cooling stage connected.
Factory Built-In Electric Heat Tables
KW
Amps
BTUH
Model
Voltage
Phase
240
208
240
208
240
208
-A05
240/208
1
5.00
3.75
20.8
18.0
17,065
12,799
-B06
240/208
3
6.00
4.50
14.4
12.5
20,478
15,359
LC2000 Dimensions and Weight
3/4" K.O. TYP.
1 1/2" K.O. TYP.
The LC2000-200
Controller must be
used with the
DUAL-TEC™ Series
Wall Mount
LC Controller
Weight: 28 lbs.
16 1/8"
6 1/16"
12"
Part
Number

MIS-3650
Included with
LC2000
Description
8301-055
EMI Ferrite Filter (1 needed for each unit connection to Controller)
2
8301-059
TEC-EYE (Service Tool), 5 ft. communication cable
1
8403-079
Remote Temperature and Humidity Sensor with 35' wire
1
8301-058
Remote Temperature Sensor (2 additional sensors may be used) with 35' wire
8301-060
Smoke Detector
Optional
8301-061
Hydrogen Detector
Optional
Addtional Temperature Sensors may be added, but not additional Temperature/Humidity Sensors.
Form No. S3521-516
SupersedesS3521-116
Page
4 of 10

Optional
DUAL-TEC™ Unit Connectivity with LC2000 Controller
DUAL-TEC™ Connectivity Features:
The DUAL-TEC™ free cooling unit is made to work in conjunction with the LC2000 Series Controller. Up to two (2) DUAL-TEC™
units can be connected to the LC2000 controller using 2-wire twisted pair with drain. Each unit and the LC2000 controller
contains an advanced PLC logic board for communication. The DUAL-TEC™ unit and LC2000 Controller have the following
connectivity features:
• When used with the LC2000 controller, humidity levels inside the shelter can be monitored and outdoor air intake through
the free unit cooling ventilator is closed when humidity levels are unacceptable.
• The DUAL TEC unit supply sensor allows temperature monitoring of conditioned and outdoor air entering the structure. By
using the supply air temperature measured, the unit is able to supply cooling within the structure without extreme
temperature variations.
• The DUAL TEC unit outdoor temperature sensor allows free cooling operation when outdoor ambient temperatures permit
operation.
DUAL-TEC™ Unit #2
(Not required for operation)
DUAL-TEC™ Unit #1
LC Controller
Climate
Controlled
Zone
Primary Indoor
Temperature and
Humidity Sensor
Hydrogen
Detector,
Normally
Closed
Contacts
Optional Indoor
Temp. Sensor #1
Fire/Smoke
Detector,
Normally Closed
Contacts
This illustration demonstrates
connection of DUAL-TEC™ units
and the LC2000 controller with
optional sensors and equipment.
Optional Indoor
Temp. Sensor #2
Remote
Access
Computer
Form No.
S3521-516
SupersedesS3521-116
Page
5 of 10
DUAL-TEC™ Unit in Orphan Mode
DUAL-TEC™ Orphan Mode Features:
The DUAL-TEC™ free cooling unit is made to function in “orphan mode” if connection to the LC controller is lost due to a
severed connection wire or other system failure. When in orphan mode, the DUAL-TEC™ unit will continue to provide cooling to
the structure until the connection can be restored. By using a return air temperature sensor measuring structure air temperature
and a supply air temperature sensor to measure air provided to the structure, the unit is able to provide cooling. Orphan mode
temperature set points are contained inside the DUAL-TEC™ PLC logic board. When connection of the DUAL-TEC™ unit is
restored, the unit temperature set points will revert back to the temperature set points programmed into the LC controller.
DUAL-TEC™ Unit
running in Orphan Mode
Supply Temp. Sensor
Leaving air
Return Temp. Sensor
Entering air
“UNIT OFFLINE”
alarm message
LC Controller
Signal
Lost!
Indoor Sensor not used
until connection restored.
Climate
Controlled
Zone
This illustration demonstrates Orphan Mode unit operation.
If connection to the LC controller is lost for any reason, the
unit will continue to operate using the return air sensor and
supply air temperature sensors in the unit.
Form No. S3521-516
SupersedesS3521-116
Page
6 of 10
DUAL-TEC™ Unit in -48VDC Free Cooling Mode
DUAL-TEC™ -48VDC only Features:
The DUAL-TEC™ free cooling unit is made to function in “-48VDC Free Cooling Mode” if conditions outside the shelter are
acceptable for cooling. The DUAL-TEC™ unit will attempt to maintain the set points programmed into the LC controller by
bringing outside air into the shelter through the unit ventilator. By running the indoor blower and maintaining a consistent supply
temperature by modulating the vent damper blade using -48VDC power supplied, the unit is able to provide cooling. Compressor
operation is used to cool the shelter in conjunction with the -48VDC indoor blower and vent if outdoor air intake is inadequate
to provide structure cooling. If outdoor ambient conditions reach a point that is unacceptable for cooling the structure, the vent
damper blade closes, and the unit runs in “compressor only” cooling mode.
DUAL-TEC™ Unit
running in
-48 Free Cooling Mode
Blower Operation
Available
Leaving air
Vent Operation
Available
Outdoor
Air Intake
LC Controller
Climate
Controlled
Zone
LC Controller
Communicates
with the DUAL
TEC unit.
Compressor Cooling
Operation
Not Used unless LC
controller set points
are not achievable
or outside
conditions are
unacceptable for
vent operation.
Indoor Temperature
Sensors used.
Hydrogen Alarm
Operational
Fire/Smoke Alarm
Operational
Ethernet
Connection
Operational
This illustration demonstrates -48VDC unit operation.
The DUAL-TEC™ unit is able to bring outdoor air into
the structure using the indoor blower and the free cooling
ventilator. The LC controller is operational during -48VDC
operation along with alarm functionality.
Form No.
S3521-516
SupersedesS3521-116
Page
7 of 10
TEC-EYE™ DIAGNOSTIC TOOL FOR USE WITH DUAL-TEC™ UNITS
TEC-EYE™ Features:
TEC-EYETM Connection to DUAL-TEC™ Unit
PLC Logic Board
The DUAL-TEC™ free cooling unit contains a PLC
logic board located inside the unit control panel. The
TEC-EYE™ tool, included with the LC2000 controller,
allows for diagnostics and unit set point settings to be
completed at the unit. This allows the user to complete
various tasks outside where the units are located, and
access to the inside controller is not needed for many
tasks. Using an RJ11 modular phone connection and the
cord provided with the TEC-EYE™, the service technician
or contractor can run testing procedures or verify unit
installation. Magnets on the back of the TEC-EYE™ allow
for temporary mounting to the side of the DUAL-TEC™
unit while these tasks are being completed.
Modular Phone Connector
for TEC-EYETM Hand-Held
Diagnostic Tool
TEC-EYE™ Diagnostic Tool
Part #8301-059
TEC-EYE™ Display
UP KEY
ALARM KEY
MENU KEY
ENTER KEY
ESCAPE KEY
ALARM KEY
Allows viewing of active alarms
Silences audible alarms
Resets active alarms
DOWN KEY
UP KEY
Steps to next screen in the display menu
Changes (increases) the value of a modifiable field
MENU KEY
Allows entry to Main Menu
ENTER KEY
Accepts current value of a modifiable field
Advances cursor
ESCAPE KEY
Returns to previous menu level
Cancels a changed entry
DOWN KEY
Steps back to previous screen in the display menu
Changes (decreases) the value of a modifiable field
DUAL-TEC™ UNIT ALARMS
Alarm Features:
The DUAL-TEC™ free cooling unit is capable of sending and storing various unit alarms and contains the following alarm features:
• Low Refrigerant Pressure Alarm
• High Refrigerant Pressure Alarm
• Landline/Shore/Prime Power Outage
• Dirty Air Filter Alarm
• DC Free Cooling Damper Fails to Open Alarm
• DC Free Cooling Damper Fails to Close Alarm
• Communication Failed Alarm
• Supply Air Temperature Sensor Failed Alarm
• Outdoor Temperature Sensor Failed Alarm
• Outdoor Humidity Sensor Failed Alarm
• Return Air Temperature Sensor Failed Alarm
NOTE: See D-Series and LC2000 Installation Manual for Network, LC Controller and Shelter Alarms.
Form No. S3521-516
SupersedesS3521-116
Page
8 of 10
Dimensions of Basic Unit for Architectural and Installation Requirements (Nominal)
Model
Width Depth Height
(W)
(D)
(H)
Supply
A
B
Return
C
B
E
F
G
I
J
K
L
M
N
O
P
Q
R
S
T
D28A/L
D36A/L 42.075 22.432 84.875 9.88 29.88 15.88 29.88 43.88 13.56 31.66 30.00 32.68 26.94 34.69 32.43 3.37 43.00 23.88 10.00 1.44 16.00 1.88
D42A/L
D48A/L
42.075 22.432 93.000 9.88 29.88 15.88 29.88 43.88 13.56 37.00 30.00 40.81 35.06 42.81 40.56 3.37 43.00 31.00 10.00 1.44 16.00 10.00
D60A/L
All dimensions are in inches. Dimensional drawings are not to scale.
D**A
RIGHT
HAND
UNIT
DT
HEATER
ACCESS
PANEL
W
BUILT IN
RAIN HOOD
4° PITCH
2.13
ELECTRIC HEAT
A
C. BREAKER/
DISCONNECT
ACCESS PANEL
(LOCKABLE)
VENT HOOD
DOOR
VENTILIATION
AIR
F
E
O
Side Wall
Mounting
Brackets
(Built In)
D
SUPPLY AIR
OPENING
Top Rain
Flashing
Shipping
Location
I
7"
Condenser
Air Outlet
S
B
S
H Optional
Electrical
Entrances
C
LOW VOLTAGE
ELECTRICAL
ENTRANCE
K J
Cond.
Air
Inlet
HIGH VOLTAGE
ELECTRICAL
ENTRANCE
L
S
RETURN AIR
OPENING
 VENT HOOD
G
R
M
S
S
P
T
FRONT VIEW
SIDE VIEW
DRAIN
N
Q
 Units ship fully assembled with Economizer Vent Hood installed.
BACK VIEW
BOTTOM
INSTALLATION
BRACKET
BUILT IN
RAIN HOOD
4° PITCH
W
D**L
LEFT
HAND
UNIT
DT
2.13
D
VENT HOOD
DOOR
H
G
Condenser
Air Outlet
BACK VIEW
I
C. BREAKER/
DISCONNECT
ACCESS PANEL
(LOCKABLE)
Top Rain
Flashing
Shipping
Location
7"
Optional
Electrical
Entrances
J
K
Cond.
Air
Inlet
Outdoor recommended minimum clearances for service and proper airflow:
Left Side 20 inches; Right Side 20 inches; Front Clearance to a solid barrier 15 feet
Indoor recommended minimum clearances to unit return is 24 inches. Supply must be able
to freely distribute conditioned air through the structure for proper unit operation.
S
S
RETURN AIR
OPENING
S
L
M
HIGH VOLTAGE
ELECTRICAL
ENTRANCE
SIDE VIEW
S
B
VENT HOOD 
LOW VOLTAGE
ELECTRICAL
ENTRANCE
R
SUPPLY AIR
OPENING
ELECTRIC HEAT
C
DRAIN
E
O
Side Wall
Mounting
Brackets
(Built In)
A
VENTILIATION
AIR
F
HEATER
ACCESS
PANEL
S
P
T
N
Q
BACK VIEW
BOTTOM
INSTALLATION
BRACKET
MIS-3618 A
Form No.
S3521-516
SupersedesS3521-116
Page
9 of 10
Air Conditioning Wall-Mount Model Nomenclature 1-Stage Compressor Models
D
36 A
2
P
A
MODEL
SERIES
CAPACITY |
28 - 2.3 Ton
36 - 3 Ton
42 - 3½ Ton
48 - 4 Ton
60 - 5 Ton
4
P
X
X
KW
05 - 5KW (1 Phase)
06 - 6KW (3 Phase)
REVISIONS
COLOR OPTIONS
X-Beige
1-White
4 - Buckeye Gray
A-Right Hand
L - Left Hand
PLC
CONTROLLER
05
VOLTS & PHASE
A-230/208-60-1
B-230/208-60-3
-48VDC Free
Cooling Unit
X
J
CONTROL
MODULES
J = HPS, LPS,
CCM, LAC,
Alarm Contacts,
Start Assist
(1-Phase only)
C = "J" Module
plus Comp. CCH
SPECIAL FEATURES
FILTER OPTIONS
P -2" Pleated (MERV 8)
M -2" Pleated (MERV 11)
COIL OPTIONS
X-Standard
3 - Phenolic Coated Evaporator and Condenser
for coastal or other severe duty environments.
DUAL-TEC™ Standard Controls
High Pressure Switch: Required Safety Device that also provides protection to the compressor system when system
refrigerant pressure is above an acceptable level. Auto Reset, 650 psig. Output to compressor control module.
Low Pressure Switch: Provides protection to the compressor when refrigerant pressure falls below an acceptable level.
Auto Reset, cut out at 40 psig. Output to compressor control module.
Low Ambient Control: Modulating control that removes power from the condenser fan to allow for unit compressor cooling
operation at outdoor ambient temperatures below 65°F. Factory set for system performance. Screw-on connection for easy
servicing. Output to condenser fan motor.
Compressor Control Module: Compressor protection device that has a 30-second to 5-minute timer. This module features
a delay-on-make for initial startup for a minimum of 2 minutes plus 10% of the timer setting. There is no delay during
routine operation. Allows one automatic retry after high pressure switch activation, then goes into hard lockout mode.
Output to PLC logic board.
Start Assist (Single Phase Models Only): PTCR motor starting device increases compressor motor torque 2-3 times.
Supply Air Sensor: 10K Thermistor measures supply air temperature, output to PLC logic board.
Return Air Sensor: 10K Thermistor measures return air temperature, output to PLC logic board.
Evaporator Coil Sensor: 10K Thermistor prevents coil freezing due to low return air temperature. Output to PLC logic board.
Outdoor Temperature & Enthalpy Sensor: 10K Temperature sensor and 4-20mA humidity transmitter, output to PLC logic
board (PLC defaults to temperature only).
Phase Monitor (3-Phase Models Only): Prevents 3-phase compressor operation to protect the compressor if the device
senses incorrect phasing. LED indicator light.
Filter Switch: Adjustable switch to indicate the unit air filter needs to be replaced. Output to PLC logic board.
DUAL-TEC™ Optional Controls
Compressor Crankcase Heater: 2-wire heater that prevents refrigerant migration and mixing with crankcase oil when the
unit is off, prevents condensation of refrigerant in the crankcase of the compressor, and keeps refrigerant at a temperature
higher than the coldest part of the system. Recommended for Canada and cold climate compressor operation.
Bard Manufacturing Company, Inc.
Bryan, Ohio 43506
www.bardhvac.com
Form No. S3521-516
SupersedesS3521-116
Page
10 of 10
Due to our continuous product improvement policy,
all specifications subject to change without notice.
Before purchasing this appliance, read important energy
cost and efficiency information available from your retailer.
Form No.
S3521
May, 2016
Supersedes: S3521-116