Analysis of Internal Protection Failure of Chiller Compressor

2024-03-11

　There is a thermal switch inside some compressors. The function of this switch is to disconnect the power supply line to the motor of the compressor when the temperature of the compressor exceeds the set value. The compressor can not work until the compressor is cooled. If thermal protection occurs frequently, we must look for the cause.

Reason 1. The refrigeration system is short of refrigerant. When the refrigerant is insufficient, the refrigerant in the compressor will be overheated, causing the compressor to heat up as a whole, causing the thermal switch to act, and generating compressor thermal protection. Treatment: make up the refrigerant, boot state, the compressor back to the pipe should be cold.

Reason 2. The condensing pressure of the compressor is too high, the cooling water or the ambient temperature is too high, which will cause the exhaust pressure of the compressor to be too high, causing the exhaust temperature to be too high, and the compressor will overheat. Solution: clean the condenser, or increase the cooling water flow pressure.

Reason 3, cold water machine selection is wrong, small selection. When the compressor selection is too small, there will be a small horse-drawn cart, the cold water machine can never reach the set temperature, the compressor will continue to work until the compressor thermal protection. Treatment: re-select the new chiller, there must be an amplification factor to ensure that the chiller can reach the set temperature shutdown.

Reason 4, compressor motor failure, poor insulation of the enameled wire, will cause the compressor current is too large, but also thermal protection. Treatment: Replace the compressor.

The above is the main reason for the compressor to produce in-machine protection, for your reference.

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Analysis of Internal Protection Failure of Chiller Compressor

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