Maritime Geothermal Water-to-Water Heat Pump W-65-H

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 standoffs

Remove the new control board from the static bag

Is the LCD Interface or PC App accessible?

Are there any alarms or faults reported?

Describe any alarms or faults found

Rectify any problems if alarms are found

Verify that all alarms and faults have been cleared

Is the system operating normally after maintenance?

Inspect contactor points for pitting or burning

Are the contactor points in good condition?

Replace contactor points if necessary

Coaxial Heat Exchanger Flushing Procedure - Open Loop

Isolate the heat exchanger by closing the valves in the IN and OUT ports to the heat exchanger.

Blow out the heat exchanger into a clean 5 gallon bucket using compressed air.

Use a 5 gallon plastic bucket, a circulator, and some plastic piping to create a makeshift pump system if a purge cart is not available.

Connect the inlet and outlet to the heat exchanger ports.

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