Maritime Geothermal Water-to-Water Heat Pump WP-45-H

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

Take a picture of the control board and connectors for reference

Remove all green terminal strips

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

Detach the control board from its four corner standoffs

Remove any remaining standoffs if present

Inspect contactor points for pitting or burning

Are the contactor points in good condition?

Replace contactor points if necessary

Replace the compressor and liquid line filter-dryer

Charge the unit with new refrigerant and operate for 2 hours

Charge the unit and operate for 2-3 days

Charge the unit and operate for 2 weeks

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.

If a purge cart is not available, use a 5 gallon plastic bucket, a circulator and some plastic piping to create a makeshift pump system. Connect the inlet and outlet to the heat exchanger ports.

Place 2 gallons of RYDLYME or similar in the purge cart (or bucket).

Circulate the fluid through the heat exchanger for at least 2 hours (3 hours recommended).