Precautions for charging refrigerant

At present, some air conditioners use non-azeotropic refrigerants such as r404a, R407c, r410a, etc., and these refrigerants must be filled with liquid. Due to the different properties and boiling points of each component of the non-azeotropic mixed refrigerant, the gas and liquid components of the non-azeotropic mixed refrigerant are different, and filling with gas will cause the composition of the refrigerant to be charged to deviate. Of course, if a tank of refrigerant is completely charged into a machine, there is no such problem.

1. Non-azeotropic refrigerant must be filled with liquid

If it is a single refrigerant such as R22 or azeotropic refrigerant such as R507, It can be filled with gas or liquid. 2. Prevent liquid shock The so-called 'liquid shock' refers to the refrigerant liquid being sucked in by the compressor, causing an abnormal shock accident to the compressor. Simply put, gas is compressible, while liquid is incompressible. When liquid refrigerant in the refrigeration system enters the compressor cylinder, it will impact the compressor valve plate, causing damage to the valve plate and other components. The most serious consequence is that it may cause permanent damage to the compressor. Liquid hammer mainly occurs in piston compressors. Too much refrigerant or lubricating oil in the system, excessive adjustment (opening) of the expansion valve (or regulating valve), and unstable heat load (heat transfer) of the evaporator may cause liquid shock. Adding liquid too fast in the process of charging refrigerant is one of the important reasons for liquid hammer. If the compressor has abnormal shock (knocking or impact) sound during charging, or accompanied by strong rocking vibration, it means that liquid shock has occurred. A slight and short-term abnormal impact may not be a big problem, but frequent long-term and heavy liquid strikes can deform the compressor, rupture or even break the valve, and directly damage the compressor.

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