Answer: When the compressor suction pressure is too low, the temperature of the compressor shell close to the low-pressure chamber will be lower than, and water vapor will frost on the compressor shell. Frosting of the compressor shell is abnormal in most cases. At this time, the following issues should be paid attention to:
(1) Frosting of the compressor indicates that the suction temperature of the compressor is already very low, and "liquid compression" should be prevented.
(2) If the dew point of the compressed air rises at the same time, it means that the refrigeration capacity of the refrigeration compressor has decreased due to the low evaporation pressure.
