1. The general method of air conditioners for the analysis of air conditioners ' failure consists of refrigeration and electrical systems, whose operational state is closely related to the working environment and conditions, so that failure analysis of air conditioners needs to be considered in a comprehensive manner. The causes of failure can be divided into two categories, either extra-machine causes or man-made malfunctions (especially the normality of the power supply) and in-house malfunctions. In the analysis of the treatment of malfunctions, off-site causes should first be eliminated. After the removal of the off-board factor, the in-flight failure can be classified as a refrigeration system failure and an electrical system failure, which should normally be addressed first. In the case of electrical system malfunctions, the following can also be found: whether the switch power delivers the power; and whether the motor circuit is normal. Along the lines of the above-mentioned general analysis, the range of malfunctions could be gradually reduced and the causes of the malfunctions could be determined. The initial check of the refrigeration system by air conditioners is conducted by means of questioning, touching, looking, listening and checking. These approaches are simple and effective. Touch: after 20-30 minutes of normal operation of compressor, touch the temperature of the straw, exhaust pipe, compressor, evaporation vent, condenser, etc., and then determine the good or bad effect of cooling. A. Compressors are generally at 90-100°c. B. Surface temperature of evaporation units. The temperature of the working air conditioner evaporation unit should be the same, with a cool surface, usually at around 15 degrees, and condensed water at the outside copper pipe bend. C. Touch the surface temperature of the condenser. When the air conditioner is operational, the condenser will soon warm up, the faster the heat will indicate the faster the cooling, the temperature of the condenser may be around 80 degrees in normal use and the temperature of the condenser wall generally is 45-55°c. D. Touching low pressure back to surface temperature. When normal, the air pipes are cold, the vent heat. Hands should be cooled, and condensed water should be present on the surface of the low-pressure backpipe if the ambient temperature is low, if the respirator is not exposed, if the high-pressure exhaust is hot and the compressor's shell is hot and likely to be inadequate as a refrigerant, if the compressor's backpipe is fully exposed and closed to half or all of the compressor's casing. E. Touch high pressure exhaust temperature. The hand should feel warmer and hotter in the summer. F. Surface temperature of dry filters. Under normal circumstances, the surface of the hand-dry filter feels slightly higher than the ambient temperature. If there is a cold feeling or condensation, there is a slight blockage of dry filters. G. Touch the wind vent temperature. The hand should feel a little chilly, and the length of the hand's stay is cold. Look at the air conditioner
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