Dunham-Bush Rotary Screw Water Chiller WCFX20

Check flash economizer feed line sightglass during unit operation

Are bubbles visible in the sight glass?

Add refrigerant through the charging valve on the evaporator feed line

Is the condenser drain sight glass clear?

Is the sight glass clear at all operating conditions?

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

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?

Drain the water from the vessel

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

Inspect for physical disfigurement of the gasket

Check for signs of deterioration

Does the gasket need renewal based on inspection results?

Document the inspection results