Maritime Geothermal Water-to-Water Heat Pump WP-55-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.

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).

Disconnect the purge system and dispose of the solution. RYDLYME is non-toxic and biodegradable and can be poured down a drain.

Connect fresh water and a drain to the heat exchanger ports and flush the exchanger for several minutes.

Return the plumbing to its original configuration and open the IN and OUT valves.

Operate the system and check for improved performance.

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

Compressor and Filter Replacement

Replace the liquid line filter-dryer

Ensure nitrogen is flowing through the system at the lowest flow rate during brazing

Charge the unit with new refrigerant and operate for 2 hours

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

Is the LCD Interface or PC App accessible?

Were any alarms or faults found?

Describe the alarms or faults found

Rectify the problem if alarms were found

Is the system functioning normally after rectification?