Maritime Geothermal Compressor WH-120-H-B-5S-PP-01

Connect the vacuum pump to the charging manifold

Start the vacuum pump and open the charging manifold valves

Monitor the vacuum gauge to ensure it 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

Are there any alarms or faults displayed on the LCD interface?

Describe any alarms or faults found

Describe the rectification actions taken

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

Pump down the unit as per the Pumpdown Procedure

Was there a compressor burn out?

Dispose of refrigerant according to local codes if there was a compressor burn out

Disconnect piping and remove crankcase heater, leaving it electrically connected

Replace the compressor and the liquid line filter-dryer

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

Vacuum the unit as per the procedure

If there was a compressor burnout, charge the unit with new refrigerant and operate it continuously for 2 hours

Pump down the unit and replace the filter-dryer

Disconnect the display board cable connector from the control board

Remove display board standoff heads

Extract the display board from the unit

Disconnect the display board cable connector from the back of the display board

Install new display board standoffs

Connect display board cable to the new display board

Position and align the new display board