Maritime Geothermal Water-to-Water Heat Pump W-55-HAC

Inspect contactor points for pitting or burning

Are the contactor points in good condition?

Replace contactor points if necessary

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).

Take a picture of the control board and connectors for reference

Remove all green terminal strips from the control board

Remove green terminal strips from the left side

Remove green terminal strips from the right side

Remove green terminal strips from the bottom

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

Detach the control board from its four corner standoffs

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

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