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SUPPLEMENTAL INSTRUCTIONS
The purpose of the CMA-44 kit is to allow the
addition of sensors for connection to a DDC control
system. These sensors include a dirty filter switch, a
discharge air sensor, an airflow verification switch and a
compressor current sensor.
The CMA-44 kit is for use with Bard models W42-72AC
wall-mount air conditioners.
The CMA-44 consists of field-installable sensors for use
with DDC control systems. The CMA-44 includes:
•
7960-855 CMA-44 Supplemental Instructions
•
910-2070 Airflow Switch Assembly
•
910-2071 Filter Switch Assembly
•
910-2073 Filter Switch Light Assembly
•
910-2090 Compressor Current Sensor
•
910-1224 Discharge Air Sensor
•
8607-021 Low Voltage Terminal Board
•
7961-837 Terminal Board Label
•
7960-854 CMC-33 Supplemental Instructions
•
8201-159 Relay, DPDT
WARNING
!
Exposed moving parts.
Disconnect all electrical power before
servicing.
Failure to do so can result in severe injury
or amputation.
CMA-44 DDC Sensors
Bard Manufacturing Company, Inc.
Bryan, Ohio 43506
www.bardhvac.com
•
3018-2134 Orange Wire (2)
•
7950-005 Nylon Cable Clamp (2)
•
8611-028 1/2" Snap Bushing (2)
•
8611-047 3/4" Snap Bushing (2)
•
1012-065 Phillips Head Screw (7)
•
1012-086 Hex Head Screw (7)
•
1012-153 Smooth Hex Head Screw (2)
•
7950-012 Push Mount Cable Tie (6)
•
7950-004 Ladder Cable Tie (2)
•
7961-312-0512 CMA-44 Unit I.D. Label
Field-supplied tools needed:
•
Personal protection equipment, including gloves
and safety glasses
•
5/16" nut driver
•
Phillips head screwdriver
•
Small flat head screwdriver for securing wire in
terminal blocks
•
Multimeter for troubleshooting
WARNING
!
Electrical shock hazard.
Disconnect the remote electric power
supply or supplies before servicing.
Failure to do so can result in serious injury
or death.
Manual:
Supersedes: NEW
Date:
7960-855
9-24-19
Page
1 of 6
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Summary of Contents for Bard CMA-44
- Page 1 SUPPLEMENTAL INSTRUCTIONS CMA-44 DDC Sensors The purpose of the CMA-44 kit is to allow the • 3018-2134 Orange Wire (2) addition of sensors for connection to a DDC control • 7950-005 Nylon Cable Clamp (2) system. These sensors include a dirty filter switch, a •...
- Page 2 3. Install the airflow switch assembly (see Figure 1). CAUTION Use two (2) 1012-086 screws to attach the switch bracket to the blower partition. 4. Install one (1) 8611-028 snap bushing in the back of the blower partition and route the hose from the Sharp metallic edges.
- Page 3 18. Attach terminal board label to terminal board (see Figure 2). Figure 4). 10. Install the discharge air sensor. 19. Attach “CMA-44” label and wiring diagram to the inner control panel cover beside the unit wiring 11. Route the discharge air sensor wires down through diagrams.
- Page 4 Figure 3 DISCHARGE AIR SENSOR ROUTE THE DISCHARGE AIR SENSOR WIRES DOWN THROUGH THE CONDUIT ELBOW AND INTO THE UPPER CONTROL PANEL. RIGHT SIDE VIEW UPPER CONTROL PANEL ROUTE THE DISCHARGE AIR SENSOR WIRES FROM THE UPPER CONTROL PANEL TO THE MAIN CONTROL PANEL.
- Page 5 Figure 4 (2) SCREWS PART #1012-065 LABEL PART #7961-837 TWO WIRES FROM CURRENT TRANSDUCER CONNECT TO BACK OF TERMINAL STRIP TERMINAL STRIP PART #8607-021 PART #8607-021 ROUTE WIRES THROUGH BUSHING MIS-4093 CURRENT SENSOR ASSEMBLY PART #910-2090 NOTE: COMPRESSOR'S BLACK WIRE IS TO BE ROUTED THROUGH HOLE IN CURRENT SENSOR Manual 7960-855...
- Page 6 Figure 5 LOW VOLTAGE SENSOR CONNECTIONS White 10k ohm DISCHARGE AIR SENSOR @ 77°F White Orange/Black 125VA @ FILTER SWITCH RELAY 24 VAC Orange/Black Blue/White 125 VA AIRFLOW SWITCH @24 VAC Blue/White COM .15A COMPRESSOR CURRENT SENSOR 30 VAC Pink NOTE: USE CLASS ONE WIRING FOR CONNECTION TO THE LOW VOLTAGE TERMINAL BLOCK MIS-4090...
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