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SUPPLEMENTAL INSTRUCTIONS
CMH-34 Low Ambient Control Kit
The CMH-34 is a field-installable low ambient fan cycling
control to be used with a Bard wall-mounted heat pump.
The CMH-34 kit is for use with Bard models W24HB,
W30HB and W36HB wall-mount heat pumps.
The CMH-34 kit consists of:
•
7960-860 Supplemental Instructions
•
8406-105 Low Ambient Fan Cycling Switch
•
910-2011 Relay Assembly
•
910-2058 Outdoor Temp Switch Assembly
•
8408-048 Freeze Protect Thermostat
•
1012-065 Phillips Head Screw (2)
•
1012-085 Hex Head Self-Tapping Screw (2)
•
7950-009 Cable Tie (4)
•
7961-312-0516 CMH-34 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) and 9/16" wrench (LAC
control)
•
Phillips head screwdriver
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: 7960-860
Date:
7960-860A
12-9-19
Page
1 of 6
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Summary of Contents for Bard CMH-34
- Page 1 The CMH-34 is a field-installable low ambient fan cycling WARNING control to be used with a Bard wall-mounted heat pump. The CMH-34 kit is for use with Bard models W24HB, W30HB and W36HB wall-mount heat pumps. Electrical shock hazard. The CMH-34 kit consists of: Disconnect the remote electric power •...
-
Page 2: Installation
(mounted to the outdoor fan shroud). This port is intended 15. Apply “This unit equipped with CMH-34 control for the application of 8406-105 low ambient fan module” label to the inside of the inner control cycling switch (see Figure 2 on page 4). -
Page 3: Sequence Of Operation
FIGURE 1 Unit Control Panel BLACK WIRE TO RELAY BLUE WIRE TO B BLACK/WHITE WIRE TO C SCREWS MULTIPLIER (TERMINAL #1) RELAY BLACK WIRES FOR LAC CONNECT OD TEMP. SWITCH TO PURPLE WIRE WITH INSULATED TAB FROM MAIN WIRE HARNESS LOW AMBIENT CONTROL MIS-4106 Sequence of Operation... -
Page 4: Low Ambient Control
FIGURE 2 9/16" WRENCH 1/2" WRENCH RUN WIRES THROUGH LOW AMBIENT CONTROL THE BUSHING UP TO PART #8406-112 THE CONTROL PANEL OUTDOOR TEMP SWITCH ASSY PART #910-2058 SCREWS PART #1012-085 MIS-4107 Manual 7960-860A Page 4 of 6... -
Page 5: Evaporator Coil
FIGURE 3 Freeze Stat Location and Wire Routing 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... - Page 6 FIGURE 4 Compressor 12 PIN PLUG Contactor (BEHIND LOW VOLTAGE BLOCK) PURPLE Defrost Logic BLACK Control BLACK/WHITE BLUE BLACK Sensor BROWN RV L2 C Low Ambient Control (opt.) Low Ambient Bypass Out Door Temp BLUE Switch YELLOW OUTDOOR FAN BLACK MOTOR YELLOW WIRE FOR 3 -PHASE...
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