Maritime Geothermal Compressor WH-90-H-B-2S-CC-01

Connect the vacuum pump to the charging manifold

Start the vacuum pump and open the charging manifold valves

Ensure vacuum gauge remains at less than 500 microns for at least 1 minute with the vacuum pump valve closed

Close the charging manifold valves

Shut off and disconnect the vacuum pump

Place a refrigerant tank with the proper refrigerant on a scale and connect it to the charging manifold

Is there a performance degradation not explained by a refrigeration circuit problem or low loop flow rate?

Flush heat exchanger with a lime removing solution

Is the system a warm water open loop system?

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

Replace the liquid line filter-dryer if the refrigeration system has been exposed to the atmosphere

Place a wet rag around any valves being installed to protect non-metallic seats or seals from excessive heat

Aim the torch flame away from the valve body

Solder only one joint at a time and cool joints down in between

Enter the nitrogen pressure at 10 psig

Enter the nitrogen pressure at 25 psig

Place the unit in SERVICE mode via the PC App or LCD interface

Ensure electrical power is not turned off at the breaker panel

Connect the refrigerant recovery unit to the heat pump’s internal service ports via a refrigeration charging manifold and to a recovery tank

Plan to dispose of refrigerant if there was a compressor burnout

Ensure refrigerant to water heat exchangers have full flow or are completely drained of fluid

Start circulation pumps via building control system if necessary

Ensure all hose connections are properly purged of air

Start the refrigerant recovery as per the instructions in the recovery unit manual

Take a picture of the control board and connectors for reference

Remove all green terminal strips on the left side, the right side, and the bottom of 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