found that the compressor and fan are normal, but the dehumidification effect is very poor

　　Check the faults: (1) the air filter and the surface of the evaporator condenser are very clean (2) there is no leakage of oil trace on the surface of the pipeline (3) there is frost near the capillary near the evaporator, and it will stop soon. After a period of time, the frost will melt off, and the compressor can run again. (4) Wrap the interface between capillary tube and evaporator with hot towel, and dehumidification is normal. It is judged to be an ice block in the refrigeration system.

　　Maintenance method: belongs to the ice block fault. Clean out all the moisture content more refrigerant system, and the nitrogen into 0.3 MPa pressure blowing system is clean, and then use vacuum pump vacuum about 20 min, then add the original machine required number of refrigerants, refrigeration run 30 min, 30 min or longer to stop pumping air into vacuum state, after checking that vacuum degree of requirements, filling the accurate amount of refrigerant, Boot operation, troubleshooting.

　　Cause analysis: this machine maintenance may allow moisture into the system or more refrigerant filling the water content, elemental water in the capillary tube and evaporator outlet, because refrigerant throttling temperature, the temperature is lower than 0 ℃, water is in the form acicular crystals, crystal product set, slowly closed capillary, refrigerant can't flow, unable to cooling dehumidification, compressor shut down due to protect. The air heats the capillary to melt the ice crystals, and the compressor can resume operation, so repeated, the dehumidification effect becomes very poor.

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