| 7. | System low on | Check refrigerant “sight glass” in 1/4” tubing. |
| refrigerant. | Check for bubbles after system has run for several | |
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| minutes. If bubbles present, call a CERTIFIED HVAC |
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| service technician. If sight is clear of bubbles, |
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| refrigerant level is OK. |
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| 8. | Thermostatic | System will operate as if it were low on refrigerant |
| expansion valve power | charge. Sight glass will be clear. Evaporator coil icing | |
| element losing its | probable. | |
| charge. | Call a CERTIFIED HVAC service technician. | |
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| 9. | Low voltage to | Low voltage will cause compressor overheating and |
| compressor, below | tripping on overload. Also, can have difficulty starting. | |
| 103V with compressor | This is usually a field wiring problem which should be | |
| running. | corrected immediately. | |
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| 10. | Cooling system not | If system is determined to run OK but not keeping up, |
| sufficient for load | run a heat gain calculation for the wine cellar and | |
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| compare with cooling system capacity. |
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| |
Evaporator blower runs, but compressor does not | |||
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| 1. | System | Observe for several minutes. Compressor should turn on |
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| at termination of “Anti Frost“ Cycle and evaporator clear |
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| of frost. |
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| 2. | Power off to | Check breaker/Refer to #3 above |
| compressor. |
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| 3. | Out of refrigerant. | Call a CERTIFIED HVAC service technician to locate leak, |
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| repair and charge with refrigerant |
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| 4. | Compressor off on | Determine if compressor is hot. If not, there is another |
| overload. | problem. If yes, shut off power to condensing unit and | |
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| call service technician |
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| 5. | Liquid line solenoid | Remove cover. Locate valve in ¼” copper tube. Check |
| valve in evaporator not | to see if it is hot. If hot and you can feel a magnetic pull | |
| active. | with a screwdriver, the valve is working. If cold, there is | |
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| no power to the valve coil. In this event, with the blower |
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| running, the valve should be powered. Call a CERTIFIED |
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| HVAC service technician. |
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| 6. | Thermostat | System will “pump down.” Compressor will stop. |
| expansion valve power | May start occasionally and shut off quickly. | |
| element lost charge | Call a CERTIFIED HVAC service technician. | |
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