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| Troubleshooting | |
Table 23 Compressor and refrigeration system troubleshooting |
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Symptom | Possible Cause | Check or Remedy | |
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| Power off | Check main switch, fuses or CBs and | |
Compressor will not start |
| wiring | |
| Current overload open | ||
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| manually. Allow compressor to cool for | |
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| internal overloads to reset. | |
| Loose electrical connections | Tighten connections | |
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| Compressor motor burned out | Check and replace compressor if | |
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| defective. | |
Compressor will not operate, | No call for cooling | Check monitor status. | |
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Solenoid valve not energizing | Hold screwdriver over solenoid and check | ||
contactor not pulling in | |||
| for magnetic field. This indicates solenoid | ||
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| is energized. | |
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| Low pressure switch not making contact | Check gas pressure - manually energize | |
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| low pressure switch. | |
Compressor will not operate, | High pressure switch open | Reset switch. Refer to other refrigeration | |
contact not pulling in |
| troubleshooting suggestions. | |
Compressor contactor pulled in but | Blown fuse or tripped CB | Check for line voltage after fuses or CBs, | |
compressor will not operate |
| and after contactors. | |
| Low pressure switch not closing | Check for low gas pressure. Compressor | |
Compressor runs for three minutes |
| is running on Positive Start Kit (air cooled | |
then stops; contactor drops out. |
| systems only) | |
| Liquid line solenoid valve not opening | Check magnetic field to see if energized. | |
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High discharge pressure | Dirty condenser or drycooler fins | Clean coil. | |
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Condenser equipment not operating | Check operation. | ||
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| High refrigerant charge | Check refrigerant charge. | |
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| Hot gas bypass valve adjusted | Adjust properly. | |
| improperly |
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| Water regulating valve adjusted | Adjust properly. | |
| improperly |
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Low discharge pressure | Excessive fluid flow through condenser | Adjust fluid regulating valve | |
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Suction service valve partially closed | Open the valve. | ||
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| Faulty head pressure control valve or | Replace if defective. | |
| condenser fan speed control |
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| Compressor rotation in reverse direction | Check for proper power phase wiring to | |
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| unit and to compressor motor. | |
| Insufficient refrigerant in system | Check for leaks, repair, and add | |
Low suction pressure |
| refrigerant for air cooled. Evacuate and | |
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| recharge for water/glycol unit. | |
| Dirty air filters | Change filters. | |
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| Plugged | Replace filter. | |
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| Improper superheat adjustment | Reset expansion valve for | |
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| Defective expansion valve sensing | Replace element | |
| element |
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| Poor air distribution | Check duct work for closed dampers. | |
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| Check for | |
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| near the unit. | |
| Low condensing pressure | Check head pressure control device. | |
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| Slipping belts | Inspect and adjust | |
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