How to distinguish inferior R22 refrigerant, this must be known

In fact, R22 or CHCLF2 is a pure substance with a purity of at least 99%; the counterfeit R22 on the market currently contains methyl chloride and other highly corrosive substances in a high proportion. Monochloromethane is highly corrosive and will cause severe corrosion to the compressor of the refrigeration unit, resulting in the compressor being scrapped.

Reminder: There are many counterfeiting methods that are hard to prevent. Don't buy things because you don’t want to be cheap. You must buy well-known brands, such as DuPont..... .

For other refrigerants, we can use the following method to make a simple judgment:

Method 1: Turn the refrigerant tank upside down and release a small amount of refrigeration If there are obvious impurities or liquid water on the white paper, it means that the quality of the refrigerant is not good and it is not recommended to use it;

Method 2: Connect the pressure gauge to test the pressure of the refrigerant bottle , Compare the refrigerant temperature and pressure characteristics table to check whether the pressure in the bottle is within the normal range. If the pressure is obviously abnormal, it is not recommended.

Method 3: When the refrigerant is halfway used, the pressure in the bottle can be tested again. For a single-component refrigerant such as R22, the two measured bottle pressure values u200bu200bshould be very close, but for inferior refrigerants , Usually mixed with a variety of components, the bottle pressure usually has a big difference due to the change of the component ratio after the refrigerant in the bottle is used. If such a phenomenon is encountered, it is recommended to stop the refrigerant immediately and charge it to The refrigerant in the system is discharged cleanly to avoid polluting the system.

Method 4: In the system debugging and operation stage, if the following abnormal phenomena are found

1), the system refrigeration capacity is obviously insufficient and no other abnormalities are found after inspection, you need to pay attention to the refrigerant; 2) When the filter or expansion valve of the system dryer is clogged, and the clogging is yellow-brown wax or black sludge foreign matter, pay attention to the refrigerant;

3), high, high, and high temperature during system operation The low pressure or temperature is abnormal, or the system balance pressure is abnormal when the system is stopped (refer to the refrigerant temperature and pressure characteristic table), the refrigerant needs to be paid attention to.

When these abnormal phenomena occur, it is recommended to extract the refrigerant from the system for purity testing to troubleshoot the risk of inferior refrigerants. During this period, it is recommended to empty the refrigerant on the compressor side or release the refrigerant in the entire system to avoid potential inferior refrigerant from contacting the compressor and damaging the compressor. You must be vigilant and buy from regular channels.

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