Bard CMH-3 User Manual
Bard Manufacturing Company
Bryan, Ohio 43506
LOW PRESSURE CONTROL
3.Low Pressure Control
For use with all WH182 – WH602
Disconnect all power to unit. Remove control panel inner and outer covers, and right side condenser inlet grille. Circled numbers on Figure 2 correspond to installation instruction steps. Dashed lines indicate that a wire has been disconnected from this terminal and reconnected to another terminal.
Use Figure 2 for WH182 to WH361.
Use Figure 3 for WH421 to WH602.
Step 1. Mount control assembly
Step 2. Disconnect blue high pressure control wire from heat pump control terminal LO and reconnect to terminal #1 of control assembly
Step 3. Connect the blue wire from control assembly
Step 4. Route low pressure control wires up through the bushing in the bottom of the control panel. Replace sealing compound after routing wires through the bushing. Route the wires through the wire holders in the control panel as shown in Figure 4. Connect the low pressure control wires between the terminals #1 and #3 of control assembly
Step 5. Connect the yellow wire from control assembly
Step 6. Connect the black wire from control assembly
Step 7. Remove service port cap on the suction line. Install the low pressure switch on the suction line. Check for pressure at the flare tee dill valves after installation to insure that the dill valve in the unit service port was depressed by the flare tee connector. Check for leaks at the flare tee connectors. Replace service port cap on the flare tee service port and tighten. See Figure 4.
Step 8. Recheck all wiring. See Figure 1. Check for proper operation of the unit by energizing in cooling mode. Run for five minutes. Unit should not go into lockout.
Step 9. Apply “This unit equipped with
Step 10. Replace all panels and covers. This completes installation.