Dunham-Bush Rotary Screw Water Chiller WCFX22

Check the current oil level in the compressor

Is the oil return visible in the compressor?

Drain the old oil from the compressor

Refill the compressor with new oil

Is the oil level within the recommended range after replacement?

Inspect the head gasket for physical disfigurement

Check the gasket for signs of deterioration

Does the gasket need renewal based on inspection results?

Document the inspection results

Has the phase control relay tripped?

Did the phase control relay trip again after resetting?

Call your electric utility to investigate the problem if the relay trips again after resetting.

Circuit Breaker and Motor Overload Relay Inspection

Has the circuit breaker or motor overload relay tripped?

Do not reset and try to run the compressor again if the circuit breaker or motor overload relay trips.

Check flash economizer feed line sightglass for bubbles

Connect refrigerant cylinder to charging valve on evaporator feed line

Monitor refrigerant level until condenser drain sight glass is clear

Ensure sight glass is clear at all operating conditions

Record full load performance data on the log sheet

Enter the current approach temperature for the evaporator

Enter the current approach temperature for the condenser

Is the approach temperature more than 2°F above the clean condition?

Have water treatment specialists recommended chemicals for cleaning?

Rinse the system thoroughly after chemical cleaning