Maritime Geothermal Water-to-Water Heat Pump WH-65-H

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

Inspect contactor for pitted points

Inspect contactor for burned points

Is replacement of contactor necessary?

Describe any issues found during inspection

Pump down the unit as per the Pumpdown Procedure

Was there a compressor burn out?

Compressor and Filter Replacement

Replace the liquid line filter-dryer

Ensure nitrogen is flowing through the system during brazing

Vacuum the unit as per above procedure

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 as such 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.

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

Carefully remove the new control board from the static bag