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

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, create a makeshift pump system using

Connect the inlet and outlet to the heat exchanger ports.

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

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

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

Was the problem rectified successfully?

Replace the compressor and liquid line filter-dryer

Charge the unit with new refrigerant and operate for 2 hours

Pump down the unit and replace the filter-dryer

Charge the unit and operate for 2-3 days

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

Install cut off standoffs from the old board onto the new board

Align and snap the new control board into the four corner standoffs