How do I adjust the damper position for each mode of operation on the Bard Geothermal 2-Stage Heat Pumps? (Bard Geothermal 2-Stage Heat Pumps Instruction Manual)

Answer

manuals.plus

Apr 11, 2025 - 10:24 AM

To adjust the damper position for each mode of operation on the Bard QWSCRV Geothermal 2-Stage Heat Pumps, follow these steps:

1. Set the damper position for blower only operation:
A. Switch the thermostat to the manual fan position with heat/cool in the OFF position (or jumper R to G with thermostat disconnected at unit).
B. Locate potentiometer OCC on the CRV control board.
C. Using a small screwdriver, adjust potentiometer OCC until the damper position aligns with the numerical location on the label interior of the sheet metal damper assembly per the graph.

2. Set the damper position for part load (stage 1) cooling or heating operation:
A. Switch the thermostat to the heat or cool mode and set it to a minimum offset to the room temperature to engage the desired mode of operation (or jumper R to G and R to Y1 [+ O for cooling] with thermostat disconnected at unit).
B. Locate potentiometer Y1 on the CRV control board.
C. Using a small screwdriver, adjust potentiometer Y1 until the damper position aligns with the numerical location on the label interior of the sheet metal damper assembly per the graph.

3. Set the damper position for full load (stage 2) cooling or heating operation:
A. Switch the thermostat to the heat or cool mode and set it to a minimum offset to the room temperature to engage the desired mode of operation (or jumper R to G, R to Y1, and R to Y2 [+ O for cooling] with thermostat disconnected at unit).
B. Locate potentiometer Y2 on the CRV control board.
C. Using a small screwdriver, adjust potentiometer Y2 until the damper position aligns with the numerical location on the label interior of the sheet metal damper assembly per the graph.

Please refer to Table 1 in the instruction manual for the factory default settings and approximate CFM values for each mode of operation. It is important to match the graph to the appropriate model to determine the necessary blade setting for achieving the required ventilation air.