Document description: basic knowledge guide for air conditioner maintenance technology: 1. General method air conditioners for air conditioner failure analysis consist 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. With the removal of infra-machine factors, the basic knowledge keyword for in-house failure sub-air conditioner maintenance techniques can be used: the bed shrink 1 and the general method of air conditioner analysis of air conditioners consist 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 inches of failure, off-board causes should first be excluded. After removal of the infra-machine failure can be classified as one of the refrigeration system failure and one of the electrical system failure, which should normally be removed 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 general analysis, the range of failures can be gradually reduced and the causes of the failures can be determined. 2. Air conditioners conduct initial checks on the operation of the refrigeration system using the method of asking, touching, looking, listening and checking. These approaches are simple and effective. Touch: after 20-30 minutes of normal operation, the compressor touches the temperature of the straw, exhaust, compressor, evaporation vent, condenser, etc., so that he or she can judge the cooling effect. A. Compressors generally at 90-100 temperatures°cob, the surface temperature of the evaporater. The temperature of the working air conditioner evaporation unit should be the same, with cool surfaces - around 15 degrees - and condensed water at the bend of the open copper pipe. C. The surface temperature of the condenser. When the air conditioner turns on, the condenser will soon warm up, the faster the heat will indicate the faster the cooler, the temperature of the condenser will be around 80 degrees in normal use, and the temperature of the condensation wall will normally be 45-55°c. D. Touch low pressure back to the surface and temperature. When normal, the air pipes are cold, the vent heat. Hands should be cooled if the ambient temperature is low and there will be condensed water on the surface of the low-pressure backpipe, if the respirator is not exposed and the high-pressure exhaust is hot, and the accelerator shell is also hot and likely to be insufficient as a refrigerant, if all of the backpipes of the bed shrinker are exposed and closed to half or all of the compressor's shell. E. Touch high pressure exhaust temperature. Hands should be warmer, with hot hands in 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. Temperature of wind vents. The hand should feel a little chilly, and the length of the inch of the hand 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 whether the high, low pressure pressure is normal, ambient temperature is 30 degrees inch, low pressure is about 0, 49, 0, 54 mpa, high pressure is about 1, 17 ~1, 37 mpa, low pressure is about 0, 58 〜0, 62 mpa at 35 degrees, high pressure is about l>93 mpa, low pressure is about 0, 68 mpa at 43 degrees, and high pressure is around 2,31 mpao to see the frost of the low pressure of the cavity tube. Normal cooling inches, when a compressor starts to operate, the catheter is applied with a thin layer of frost, which is then gradually reduced, but the problem of a lack of refrigerants or blockage occurs. 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. The air conditioner is operating in inch and makes a certain noise, but if one or more abnormal sounds are heard, the sound of “humming” can immediately determine that the compressor's motor is not properly activated, and the power should immediately be turned off and the cause should be found; the sound of “helicopter” is the high pressure flow that follows the break in the compressor's high pressure-resilence vibration tube; the sound of “silence” is the sound of a collision of the internal metal of the compressor; and the sound of “half” is the sound of an impact after the spring of the compressor has fallen or broken. In the case of an open compressor, the first-like and even-sizing “twirl” or a small “twirl” of the valve; in the case of a “twirl” that is a condenser, there is a large volume of refrigerant inhaling retortorts with loose impact; and a “clap” is a beat after the belt has been damaged. The sound of the centrifugal and axle fan operating should be balanced and even, and if the friction or the axis is not correct, there is a common sound. The system is largely unblocked to hear the lighter air flow (systemial pressure balance inch) of “suction”. In addition, other noises can be judged by the hearing, such as: the sound of an axle-flowing fan hitting an iron piece of the outer shell; the “creaking” scream of a wind engine with oil; the “creaking” sound of a wind machine's centrifugal fan and foam shell; the sound of loose bolts and vibrations on the base of the compressor; and the sound of a fur tube touching the outer shell. Z: it's usually used to use jade force
