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SUPPLEMENTAL INSTRUCTIONS
The purpose of the CMA-40 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-40 kit is for use with Bard models W18-36AB
wall-mount air conditioners. NOTE: This kit is not
intended for units with mechanical dehumidification.
Component mounting locations as depicted in these
instructions will encounter obstructions if attempting to
install on units with dehumidification.
The CMA-40 consists of field-installable sensors for use
with DDC control systems. The CMA-40 includes:
•
7960-849 Supplemental Instructions
•
910-1894 Airflow Switch Assembly
•
CMC-31 Dirty Filter Switch Kit
•
910-1223 Compressor Current Sensor
•
910-1224 Discharge (Supply) Air Sensor
•
8607-021 Low Voltage Terminal Board
•
7961-837 Terminal Board Label
•
8611-033 7/8" Snap Bushing (2)
•
1012-065 Phillips Head Screw (6)
•
1012-086 Hex Head Screw (8)
•
7961-312-0483 CMA-40 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
NOTE: Low ambient kit required for Balanced Climate
and compressor operation below 60º F (sold separately).
CMA-40 DDC Sensors
Bard Manufacturing Company, Inc.
Bryan, Ohio 43506
www.bardhvac.com
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.
WARNING
!
Exposed moving parts.
Disconnect all electrical power before
servicing.
Failure to do so can result in severe injury
or amputation.
CAUTION
!
Sharp metallic edges.
Take care and wear appropriate protective
devices to avoid accidental contact with
sharp edges.
Failure to do so can result in personal
injury.
Manual:
Supersedes: NEW
Date:
7960-849
9-17-19
Page
1 of 4
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Summary of Contents for Bard CMA-40
- Page 1 SUPPLEMENTAL INSTRUCTIONS CMA-40 DDC Sensors The purpose of the CMA-40 kit is to allow the WARNING 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.
- Page 2 Installation 3. Install the airflow switch assembly using two (2) hex head screws. Use the holes in the blower 1. Disconnect all power to wall mount before partition shown in Figure 1. installing sensors. 4. Route the wires into the control panel. 2.
- Page 3 6. Route the filter switch wires into the control panel. 8. Install the discharge (supply) air sensor using the screw removed in Step 7 and one (1) additional 7. Remove screw from the electric heater bracket (see hex head screw supplied with kit. Figure 2).
- Page 4 FIGURE 4 16. Attach terminal board label to terminal board. Figure 5 17. Attach “CMA-40” label and wiring diagram to the 10K ohm inner control panel cover above the unit wiring @ 77˚F DISCHARGE AIR SENSOR diagrams. 18. Make low voltage connections from the DDC 24 VA controller to the terminal board.
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