TROUBLESHOOTING & SERVICING REFRIGERATION SYSTEM
| PROBLEM |
| POSSIBLE CAUSE |
| REMEDY | |
7. | Start capacitor open or shorted | 1. | Relay contacts not opening | 1. | Replace relay. | |
| blown. |
| properly. | 2. |
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| 2. | Prolonged operation on start cycle |
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| due to: |
| a. Determine reason and correct. | |
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| a. Low voltage to unit. |
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| b. Improper relay. |
| b. Replace. | |
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| c. Starting load too high. |
| c. Correct by using pump down | |
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| arrangement if necessary. | |
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| 3. | Excessive short cycling. | 3. | Determine reason for short cycling | |
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| (see 5 above) and correct. | |
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| 4. | Improper capacitor. | 4. | Determine correct size and | |
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| replace. | |
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8. | Run capacitor open, shorted or | 1. | Improper capacitor. | 1. | Determine correct size and | |
| blown. |
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| replace. | |
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| 2. | Excessively high line voltage | 2. | Determine reason and correct. | |
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| (110% of |
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9. | Relay defective or burned out. | 1. | Incorrect relay. | 1. | Check and replace. | |
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| 2. | Incorrect mounting angle. | 2. | Remount relay in correct position. | |
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| 3. | Line voltage too high or too low. | 3. | Determine reason and correct. | |
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| 4. | Excessive short cycling. | 4. | Determine reason (see 5 above) | |
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| and correct. | |
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| 5. | Relay being influenced by loose | 5. | Remount rigidly. | |
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| vibrating mounting. | 6. | Replace with proper capacitor. | |
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| 6. | Incorrect run capacitor. | |||
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10. | Product zone temperature too | 1. | Control setting too high. | 1. | Reset control. | |
| high. | 2. | Inadequate air circulation. | 2. | Rearrange product load to | |
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| improve air circulation. | |
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11. Suction line frosted or sweating. | 1. | Overcharge of refrigerant. | 1. | Correct charge. | ||
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| 2. | Evaporator fan not running. | 2. | Determine reason and correct. | |
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| 3. | If remote model, expansion valve | 3. | Replace. | |
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| stuck open. | 4. | Readjust valve or replace with | |
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| 4. | If remote model expansion valve | |||
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| is passing excess refrigerant or is |
| properly sized valve. | |
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| oversized. |
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12. | Liquid line frosted or sweating. | 1. | Restriction in dehydrator or | 1. | Replace part. | |
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| strainer. | 2. | Open valve fully. | |
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| 2. | Liquid | |||
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| partially closed. |
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13. | Noisy condensing unit. | 1. | Loose parts or mounting. | 1. | Find and tighten. | |
2. | Tubing rattle. | 2. | Reform to be free of contact. | |||
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| 3. | Bent fan blade causing vibration. | 3. | Replace blade. | |
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| 4. | Fan motor bearings worn. | 4. | Replace motor. | |
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