Dunham-Bush Rotary Screw Water Chiller WCFX18

Check water treatment system components

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 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

Check flash economizer feed line sightglass for bubbles

Are bubbles visible in the sight glass?

Add refrigerant through the charging valve on the evaporator feed line

Ensure condenser drain sight glass is clear

Is the sight glass clear at all operating conditions?

Record full load performance data on the log sheet

Has the approach for either vessel increased by more than 2°F above the clean condition approach?

Drain the water from the vessel

Brush each tube individually with a tube cleaning brush

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