Refrigerator Troubleshooting Diagram

Compressor Safety Devices

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Several safety devices protect the compressor in abnormal situations. For instance, the high pressure switch interrupts the compressor control circuit when the refrigerant high-side pressure becomes excessive. A low pressure switch interrupts the compressor control circuit when the refrigerant low-side pressure becomes too low. The compressor is protected from overloads by current-operated circuit breakers. Thermal devices embedded in the windings of the compressor motor open the circuit when too much heat is generated by the windings. Some manufacturers place a 5-min delay device in series with the compressor motor. Thus, the motor cannot be restarted for 5 min after shutdown.

When any of the above safety devices are actuated, current in the Y1 leg is interrupted and shuts off the compressor and condenser fan motors.

Written by sam

February 7th, 2011 at 7:38 am

Posted in Air Conditioning

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