Treatment of refrigerant leakage in common heat pump water heaters

Refrigerant leakage is one of the most common failures of heat pump systems. The reasons for the leakage are production process problems, such as poor welding quality, friction between copper pipes or between copper pipes and the casing, etc., and parts For example, pressure gauges, high and low pressure switches, pressure relief valves, refrigerant charging check valves, etc., may also cause refrigerant leakage due to their own quality problems.

The performance of the heat pump after refrigerant leakage is that all components can operate normally, but the heating capacity is greatly reduced or even lost, and refrigerant leakage will be accompanied by With the reduction of oil, the compressor runs for a long time, but cannot reach the predetermined water temperature and stops. In addition, the return air volume is too small, which will cause the temperature of the compressor casing to rise, the lubrication deterioration, and the risk of the compressor.

The method of judging refrigerant leakage is to check the return air pressure of the compressor when the heat pump is running. If it is lower than the normal value, it can also be judged that the system has leaked. Another more intuitive and simple method is to observe the evaporator: due to the low pressure drop caused by refrigerant leakage, the frosting tendency of the heat pump evaporator is intensified, and unreasonable frosting may occur (such as when the temperature is above 10°C). Frost). After a refrigerant leak occurs, you should immediately start leak detection and repair the leak. Do not replenish the refrigerant hastily. If the leakage cannot be detected and repair the leak, the leakage of the refrigerant will continue. At the same time, when the refrigerant is refilled , We must pay attention to the appropriate amount of replenishing refrigeration oil.

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