Maritime Geothermal Water-to-Water Heat Pump WH-90-H-B-4S

Compressor Contactor Inspection

Inspect the contactor for the following issues

Is replacement of the contactor necessary?

Is tightening of wires necessary?

Replace the contactor if necessary

Remove the display board cable connector from the control board

Slice each of the display board standoff heads off using a sharp utility knife

Pull the display board from the unit

Remove the display board cable connector from the back of the display board

Place a new display board standoff into each of the four holes in the cabinet

Is there a performance degradation not explained by a refrigeration circuit problem or low loop flow rate?

Flush heat exchanger with a lime removing solution

Is the system performance restored?

Describe any issues encountered during maintenance

Are there any alarms or faults reported on the LCD interface?

Rectify the problem if any alarms or faults are found.

Ensure all alarms are cleared after rectification.

Confirm that the system is operating normally after rectification.

Take a picture of the control board and connectors for reference

Remove all green terminal strips from the control board

Remove the red six pin display board connector from the left side of the control board

Remove all connectors from the top of the control board

Remove the control board from its four corner standoffs

Remove the new control board from the static bag

Place cut off standoffs from the old board into the new board