Chlorodifluoromethane R-22, or CHCLF2, is a pure substance with a purity of at least 99%. The counterfeit Chlorodifluoromethane R-22 on the market currently contains monochloromethane and other highly corrosive substances with a high proportion. Monochloromethane is highly corrosive and will cause severe corrosion to the compressor of the refrigeration unit, resulting in the scrapping of the compressor.

　　Reminder: Many counterfeiting methods are hard to guard against. Don't be greedy for cheap purchases, and you must buy well-known big brands.

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

　　Method 1: Turn the refrigerant tank upside down and release a small amount of refrigerant onto a piece of white paper. If there are obvious impurities or liquid water on the white paper, it indicates that the refrigerant is of poor quality and is not recommended;

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

　　Method 3: When the refrigerant is half used, the pressure in the bottle can be tested again. For a single-component refrigerant such as Chlorodifluoromethane R-22, the two measured bottle pressure values ​​should be very close, but for inferior refrigerants, there are usually mixed There are many kinds of components. After the refrigerant in the bottle is used, the pressure of the bottle usually varies greatly due to the change of the composition ratio. If such a phenomenon is encountered, it is recommended to stop the refrigerant immediately and to charge the refrigerant in the system The agent 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) When the system's refrigeration capacity is insufficient and no other abnormalities are found after inspection, attention should be paid to the refrigerant; 2) When the system dryer filter or expansion valve is clogged, and the clogging is yellow-brown wax-like or black sludge-like foreign matter Need to pay attention to refrigerant;

　　3). High and low pressure or temperature abnormalities occur during system operation, or the system balance pressure is abnormal when the system is stopped (refer to the refrigerant temperature and pressure characteristics table), and attention should be paid to the refrigerant.

　　When these abnormal phenomena occur, it is recommended to extract refrigerant from the system for purity testing to troubleshoot the risk of inferior refrigerant. 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.