Document description: basic knowledge of air conditioning maintenance techniques
The general method of air conditioner failure analysis consists of refrigeration and electrical systems, whose operational status 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, one of external causes or human-induced failure (see table 2). In particular, the power supply is normal) and the other category is in-house failure. 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. 2. The initial check of the refrigeration system by air conditioners is conducted by means of questioning, touching, seeing, 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 for evaporation units. The temperature of the working air conditioner evaporation unit should be the same, with a cool surface, typically at about 15 degrees, and condensed water at the outside copper pipe bend. C. Surface temperature for condensers. 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. Temperature of high pressure exhausts. 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 vent temperature. The hand should feel a little chilly, and the length of the hand's stay is cold. See whether the air conditioner is in good shape and whether the parts are working properly. Second, it is possible to see whether the circuits of the refrigeration system are broken, whether there are oil trails in the welds, and if there are oil trails in the welds. Take a closer look at whether the plugs in the electrical components are loose, whether the copper tubes are in the right position and whether the copper tubes touch the shell. Finally, take a look at whether the centrifuge and axle wind is disproportionate and whether there is a visible vibration in the electric motor and compressor. See if high, low pressure pressure values are normal, ambient temperature at 30 degrees, ~, ambient temperature at 35 degrees, ~, mpa, ambient temperature at 43 degrees, mpa. Look at the frost in the low pressure part of the capillary. While normal cooling occurs when a compressor begins to operate with a thin layer of frost, the catheter is then gradually melted out, but there is a lack of refrigerants or blockage. It is worth noting that the outdoor thermal exchangeer is a low-pressure, low-temperature component while working in the heat pump cycle during the winter, and can also cause refrigerant leakage and congestion. If the catheter is exported to the outdoor thermal exchanger entrance, there is frost and the rest is dry, indicating that the catheter is half blocked. On the surface, refrigerant deficiencies and semi-clogged patterns are consistent. It should also be noted that air conditioners operate with a first look at the external working conditions of the air conditioners, such as whether the temperature of the air conditioners is too high or too low, whether the filters are too dirty or not, so as to exclude external causes and inappropriate use. Listen: listen carefully to the sound of the whole thing working. When the air conditioner works, it makes some noise, but if
