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