Maritime Geothermal Water-to-Water Heat Pump WH-80-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 four corner standoffs

Remove any remaining standoffs from the old control board

Remove the new control board from the static bag

Pump down the unit as per the Pumpdown Procedure

Was there a compressor burn out (motor failure)?

Compressor and Filter Replacement

Replace the liquid line filter-dryer

Ensure nitrogen is flowing through the system during brazing procedures

Inspect for pitted points on the contactor

Inspect for burned points on the contactor

Is replacement of contactor points necessary?

Replace contactor points 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

Installation of New Display Board

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

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).