Quincy Compressor QSVB Series User Manual

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Section VIII
TROUBLESHOOTING
PROBABLE CAUSE CORRECTIVE ACTION
Failure To Start
Power not turned "ON" Turn the power "ON" by closing the main disconnect switch or circuit
breaker
Blown control circuit fuse Replace fuse. Find and correct cause
Safety circuit shutdown resulting from
high discharge air temperature
Correct the situation in accordance with the instruction in the "High
Discharge Air Temperature " section of this troubleshooting guide.
Restart the vacuum pump
Thermal overload relays tripping Correct the cause of the overloaded condition, reset overload relay and
press the start button
Low voltage Ask the power company to make a voltage check at your entrance meter,
then compare that reading to a reading taken at the motor terminals. Use
these two readings as a basis for locating the source of low voltage
Faulty start switch Check the switch for malfunction or loose connections
Power failure Check power supply to the unit
Faulty control relay Replace the relay
Loose wire connections Check all wiring terminals for contact and tightness
Faulty High Air Temperature Switch
Check H A T switch. Contact a qualified service technician for repairs.
Faulty transformer Check secondary voltage on transformer
Unscheduled Shutdown
High air discharge temperature Correct the situation in accordance with the instruction in the "High
Discharge Air Temperature " section of this troubleshooting guide.
Restart the vacuum pump
Thermal overload relays tripping Correct the cause of the overloaded condition, reset the overload relay
and press the reset button
Power failure Check the power supply to the unit
Faulty HAT sensors Contact qualified service technician
Loose wire connections Check all wiring terminals for contact and tightness
Faulty control relay
Replace relay
Excessive discharge pressure Lower full load pressure setting at control panel
Low voltage Check voltage and amperages while operating the unit at full load and
full pressure
Loose overload connection Tighten mounting screws on thermal overload
Incorrect thermal overload relay setting Check motor nameplate and compare to overload relay setting
Loose motor or starter wiring Check all connections for tightness
Faulty motor Check motor starter wiring before removing motor. Remove motor and
have tested at motor manufacturer repair center

Quincy Compressor QSVB Series Specifications

General

Brand	Quincy Compressor
Model	QSVB Series
Category	Water Pump
Language	English