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What are some common reasons that cause commercial refrigerators to not refrigerate

Update:2021-07-23
Summary: Improper adjustment of the expansion valve and outlet valve of commercial refrigerators, excessive refrigerant in the system, air in the refrigerat...
Improper adjustment of the expansion valve and outlet valve of commercial refrigerators, excessive refrigerant in the system, air in the refrigeration system, poor sealing of valve plate components, wear of compressor cylinder liner pistons, etc.
The high-pressure output buffer pipe in the compressor is broken, ice making machine or the screw fixing this pipe is loose, causing the high-pressure pipe to not discharge air and the low-pressure pipe to not suck air, so although the compressor is running, it is not cooling.
The refrigeration system leaked and the refrigerant ran out. Although the compressor was running, there was no refrigerant in the system to evaporate and absorb heat, so the temperature in the commercial refrigerator did not drop.
The capillary tube is blocked, the refrigerant cannot enter the evaporator to evaporate and absorb heat, and the temperature in the commercial refrigerator does not drop.
Commercial refrigerators have leaks in the refrigeration system due to improper welding or improper use. The commercial refrigerators in the refrigeration system will not be refrigerated if all the refrigerant in the refrigeration system leaks for a certain period of time.
Check whether the gear position of the commercial refrigerator is correct. Different gear positions have an effect on the power consumption and temperature of the commercial refrigerator.
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