Dunham-Bush Rotary Screw Water Chiller WCFX12

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

Wipe down external surfaces of unit

Inspect control panel for loose wires

Inspect control panel for burned contacts

Inspect control panel for signs of overheated wires

Unit Restart and Performance Check

Is the oil level within the normal range?

Drain old oil from the compressor

Ensure compressor shows oil return

Has the phase control relay tripped?

Did the phase control relay trip again after resetting?

Call your electric utility to investigate the problem

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

Record full load performance data on the log sheet

Check if the approach for either vessel increases by more than 2°F above the approach recorded at clean conditions

Rinse the system thoroughly after cleaning to remove chemicals

Drain the water from the vessel tubes

Remove the headers from the vessel tubes

Brush each tube individually with a tube cleaning brush

Replace the headers, ensuring proper gasket positioning