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

Is the LCD Interface or PC App accessible?

Is the heat pump problem suspected?

Are alarms reported through a BACnet system?

Check for alarms and faults on the LCD Interface or PC App

Describe any alarms or faults found

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.

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.

Turn the power on to the unit and verify the display works

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

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 (marked DISPLAY on the board)

Remove all connectors from the top of the control board

Remove the control board from its four corner standoffs

Remove any remaining standoffs if present

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