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SUPPLEMENTAL INSTRUCTIONS
CMA-38 Low Ambient 460V Fan Speed Control
The CMA-38 is a field-installable low ambient fan
speed control for 460V motors. The CMA-38 460V
head pressure control helps maintain the correct
condensing temperature/pressure, which results in a
constant head pressure. By adjusting the condenser
fan speed, the CMA-38 controls the airflow through
the condenser. A single desired temperature/pressure
setpoint adjustment will result in precise condensing
temperatures and stable head pressures.
The CMA-38 kit is for use with Bard models W24AB-C
wall-mount air conditioners.
The CMA-38 kit consists of:
•
7960-847 Installation Instructions
•
902-2069 Fan Speed Control Box
•
910-2058 Outdoor Temperature Switch Assembly
•
8408-048 Freeze Protect Thermostat
•
5810-006 Flare Tee
•
1012-066 3/4" Screw (1)
•
8607-017 Terminal Block
•
1012-085 1/2" Self-Tapping Screws (5)
•
7950-004 Nylon Wire Ties (6)
•
7961-312-0338 CMA-38 Unit I.D. Label
Field-supplied tools needed:
•
Personal protection equipment, including gloves
and safety glasses
•
5/16" nut driver
•
1/2" wrench (service port), 11/16" wrench (LAC
control) and 3/4" wrench (LAC assembly)
•
Side cut pliers (for cable tie removal)
•
Flat head screwdriver
•
Small flat head screwdriver for securing wire in
terminal blocks
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: 7960-847A
Date:
7960-847B
12-9-19
Page
1 of 8
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Table of Contents
Related Manuals for Bard CMA-38
Summary of Contents for Bard CMA-38
- Page 1 Failure to do so can result in serious injury The CMA-38 kit is for use with Bard models W24AB-C or death. wall-mount air conditioners. The CMA-38 kit consists of: WARNING •...
- Page 2 Installation 5. Install outdoor temperature switch assembly to the fan shroud and route wires through the bushing 1. Disconnect all power to the unit. Remove control and up to the control panel as shown in Figure 3 panel inner and outer covers, upper front panel and on page 4.
- Page 3 9. Check wiring and control knob settings. See Figure yellow/black wire going to the CCM. 5 (page 6) and Figure 6 (page 7) for wiring and 12. Apply “This unit is equipped with CMA-38 control suggested setpoints. module” label to the inside of the inner control 10.
- Page 4 The condenser fan motor should start and ramp up speed as system The CMA-38 enables the user to set and adjust the pressure increases. pressure to be maintained by the control. The setpoint pressure is adjustable from 35-465 psig.
- Page 5 FIGURE 4 USE ONE OF THE MIDDLE HEADER STUBS TO ATTACH THE FREEZE STAT TO THE EVAPORATOR COIL FREEZE STAT WIRES RUN DOWN COPPER THROUGH THE GROMMET AND INTO THE CONTROL PANEL WITH THE BLOWER MOTOR WIRES MIS-4054 Manual 7960-847B Page 5 of 8...
- Page 6 FIGURE 5 TRANSFORMER COMPRESSOR CONTACTOR CABLE DUCT TERMINAL BLOCK FROM FAN MODULATING MOTOR LOW AMBIENT BOX MIS-4074 MIS-4074 Manual 7960-847B Page 6 of 8...
- Page 7 FIGURE 6 Set to "MIN" position Set to "315" position Set to "MIN" position Set jumper to top 2 pins (N.O. Setting) TO PRESSURE TRANSDUCER BLACK/WHITE BLUE RED/WHITE BLACK MIS-3881 A Manual 7960-847B Page 7 of 8...
- Page 8 FIGURE 7 Compressor Contactor 12 Pin Plug (Behind Low Voltage Block) Blue on Purple W24 Units Low Ambient Control Compressor Control Module Black Brown on W24 Units Terminal Block #2 Outdoor Black Fan Motor MINUTES 1 PHASE UNITS Outdoor Temp Switch Yellow MIS-4052 B...
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