Teach you how to distinguish inferior refrigerants in cold storage with a smart eye

The use of inferior refrigerants in the cold storage installation process will not only affect the performance and stability of the system, but also cause damage to the system components and compressors. Many years of practical experience from refrigeration experts will teach you how to discern inferior refrigerants with a smart eye: First, 'price discrimination' refrigerants, whether to buy refrigerants produced by regular manufacturers through formal channels, such as refrigerants whose prices are significantly lower than the market price, should be caused Highly vigilant. Second, 'equipment testing' If you have testing conditions, it is recommended to test the purity and acidity of the refrigerant before using it. It is not recommended to use refrigerants whose test results are significantly lower than the industry standard. Note: The purity of qualified R22 refrigerant should be greater than 99% (the purity of high-quality refrigerant is greater than 99.8%), and the acidity (in HCL) should be less than 0.0001. Third, 'simple inspection' If you do not have the refrigerant detection conditions, it is recommended to perform a simple inspection before using the refrigerant. The simple inspection method can be: [1] Turn the refrigerant tank upside down and release a small amount of refrigerant to the On a piece of white paper, if there are obvious impurities or liquid water on the white paper, it indicates that the quality of the refrigerant is not good and it is not recommended; [2] Connect the pressure gauge to test the pressure of the refrigerant bottle, and compare it with the refrigerant temperature and pressure characteristics table, Check whether the pressure in the bottle is within the normal range. If the pressure is obviously abnormal, it is not recommended. And when the refrigerant is half 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, multiple components are usually mixed. After the internal refrigerant is used, the bottle pressure 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 discharge the refrigerant that has been charged into the system to avoid it. Pollution system. Fourth, 'system debugging' In the system debugging and operation stage, if the following abnormal phenomena are found: [1] The system's refrigeration capacity is obviously insufficient and no other abnormalities are found after inspection, the refrigerant needs to be paid attention to; [2] The system dryer filter or When the expansion valve is blocked and the blockage is yellow-brown wax-like or black sludge-like foreign matter, pay attention to the refrigerant; [3] High and low pressure or temperature abnormalities occur during system operation, or the system balance pressure is abnormal when the system is shut down (can be Compare with the refrigerant temperature and pressure characteristics table), the refrigerant needs to be paid attention to. 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 from the entire system to avoid potential inferior refrigerant from contacting the compressor and damaging the compressor. Once it is discovered that the unit components or compressors fail due to chemical pollution caused by inferior refrigerant, the units that have used the same source of refrigerant in the site (even if the unit is still working normally) need to replace the refrigerant. Because the influence of harmful chemical components in low-quality refrigerants is sometimes slow, it may cause system failure after a long period of use.

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