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Section IX - Troubleshooting
Probable Causes:
Corrective Action:
Quincy Compressor
®
- QSD™ 71
Failure to Start (continued):
RELAY BOARD COMMUNICATION FAILURE
SAFETY CIRCUIT SHUTDOWN
EMERGENCY STOP BUTTON PRESSED
FAULTY START BUTTON
LOOSE WIRE CONNECTIONS
HIGH DISCHARGE PRESSURE
CONTACTOR NOT ENGAGING
Unscheduled Shutdown:
HIGH AIR DISCHARGE TEMPERATURE
SAFETY CIRCUIT SHUTDOWN
FAULTY HAT SENSORS
EXCESSIVE DISCHARGE PRESSURE
LOW FLUID PRESSURE
CHECK CABLE AND CONNECTION ENDS OF COMMUNICATION
CABLE
BETWEEN RELAY BOARD AND MICROPROCESSOR.
UNPLUG AND THEN PLUG THE CONNECTOR BACK IN AT THE
RELAY
BOARD AND AT THE MICROPROCESSOR BOARD.
CONTACT AN AUTHORIZED QUINCY SERVICE TECHNICIAN.
DIAGNOSE CAUSE IN ACCORDANCE WITH THE INSTRUCTIONS ON
THE
LED DISPLAY. CORRECT CAUSE AND RESTART
COMPRESSOR
.
RESET EMERGENCY STOP BUTTON AND START COMPRESSOR.
CHECK FOR FAILURE OF THE HAT PROBE(S).
CHECK FOR FAILURE OF THE COOLANT FLOW SWITCH.
CHECK THE BUTTON FOR MALFUNCTION OR LOOSE CONNECTIONS.
CHECK ALL WIRING TERMINALS FOR CONTACT AND TIGHTNESS.
COMPRESSOR WILL START WHEN STAGE 2 DISCHARGE PRESSURE
DROPS
BELOW 10 PSIG.
CHECK CONTROL WIRE CONNECTIONS. CHECK FOR POWER TO
CONTACTOR
COIL. CHECK SIGNAL WIRES FROM CONTACTOR
AUXILIARY
CONTACTS.
CORRECT THE SITUATION IN ACCORDANCE WITH THE
INSTRUCTION
IN THE HIGH DISCHARGE AIR TEMPERATURE
SECTION
OF THIS TROUBLESHOOTING GUIDE. RESTART THE
COMPRESSOR
.
DIAGNOSE CAUSE IN ACCORDANCE WITH THE INSTRUCTIONS ON
THE
LED DISPLAY. CORRECT CAUSE AND RESTART
COMPRESSOR
.
CONTACT AN AUTHORIZED QUINCY SERVICE TECHNICIAN FOR
REPAIRS
.
LOWER FULL LOAD PRESSURE SETTING AT CONTROL PANEL.
CHECK FLUID FILTER AND FLUID PUMP FOR PLUGGING. CHECK
FLUID
SUPPLY TEMPERATURE AT INLET TO FLUID PUMP FOR
FOULED
COOLER.