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The frosting of the compressor air return port indicates that the compressor air return gas temperature is too low, it is known that the refrigerant of the same quality will have different performance if it changes the volume and pressure, that is, if the liquid refrigerant absorbs more heat, then the refrigerant of the same quality will have high pressure, temperature and volume, and if the heat absorption is less, the pressure, temperature and volume will be low.
That is to say, if the compressor return temperature is low, it generally shows that the return air pressure is low and the refrigerant volume of the same volume is high. The root of this situation is that the refrigerant flowing through the evaporator can not fully absorb the heat required for its expansion to the predetermined pressure temperature value, resulting in the temperature pressure volume value of the return air is relatively low.
There are two causes of this problem:
1, the throttle liquid refrigerant supply is normal, but the evaporator can not normally absorb heat to supply refrigerant expansion.
2, the evaporator heat absorption work normally, but the throttle valve refrigerant supply is too much, that is, the refrigerant flow is too much, we usually understand as more fluorine, that is, more fluorine will also cause low pressure.
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