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Causes and symptoms of dirty blockage in refrigeration system:

The formation of dirty plugging fault is caused by excessive impurities in the refrigeration system. The main sources of impurities in the system are: dust and metal debris in the manufacturing process of the refrigerator, the oxidation layer on the inner wall of the pipeline is dropped off during welding, the internal and external surfaces of various parts are not cleaned during processing, the pipeline seal is not strict, dust enters the pipe, the refrigerant oil contains impurities, and the poor quality desiccant powder in the dryer filter. When these impurities and powder flow through the filter dryer, most of them are removed by the filter dryer. When there are more impurities in the filter dryer, some small dirt and impurities are brought into the capillary tube by the refrigerant with higher flow rate, and are retained and accumulated in the part with greater resistance in the bending section of the capillary tube. The resistance is increasing, so that the impurities are more easily retained until the capillary tube is blocked. The refrigeration system cannot be cycled until. In addition, the distance between the capillary tube and the filter screen in the filter dryer is too close, and it is easy to cause dirty blockage failure; In addition, it is also easy to weld the capillary tube mouth when welding the capillary tube and the filter dryer.

After the refrigeration system is dirty and blocked, because the refrigerant can not be circulated, the compressor runs continuously, the evaporator is not cold, the condenser is not hot, the compressor shell is not hot, and there is no airflow in the evaporator. If partially blocked, the evaporator has a cool or cold feeling, but does not frost. Touch the outer surface of the filter dryer and capillaries to feel very cool, frosty, and even a layer of white frost. This is because when the refrigerant flows through the micro-blocked filter dryer or capillary, the throttling and pressure reducing effect is generated, so that the refrigerant flowing through the blockage will expand, vaporize, and absorb heat, resulting in dew or frost on the outside surface of the blockage.

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