Quincy Compressor QSI Series Instruction Manual page 114

Section IX - Troubleshooting
Probable Causes:
Unscheduled Shutdown:
High discharge air temperature
Thermal motor overload relays tripping
Power failure
Faulty HAT sensors
Loose wire connections
Faulty control relay
Thermal Overload Relays Tripping:
Excessive discharge pressure
Low voltage
Loose overload connection
Incorrect thermal overload relay setting
Loose motor or starter wiring
Faulty motor
112
Corrective Action:
Turn the power "ON" by closing the main dis-
connect switch or circuit breaker.
Replace fuse. Find and correct cause.
Correct the situation in accordance with
the instruction in the "High Discharge Air
Temperature" section of this troubleshooting
guide. Restart the compressor.
Correct the cause of the overloaded condi-
tion, reset overload relay and press the start
button.
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.
Check the switch for malfunction or loose
connections.
Check power supply to the unit.
Replace the relay.
Check all wiring terminals for contact and
tightness.
Check H A T switch. Contact a qualified ser-
vice technician for repairs.
Check secondary voltage on transformer.
Correct the situation in accordance with the
instruction in the "High Discharge Air
Quincy Compressor-QSI
®