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1. The air conditioner compressor starts frequently
◆ During the startup of the air conditioner compressor, there is generally a step-down start circuit, but the start current will exceed several times the rated current, and the start temperature of the air conditioner compression motor rises very quickly. If the temperature setting of the air conditioner is improper, the cooling temperature is too low, and the heating temperature is too high, this will cause the air conditioner compressor to switch on and off frequently, which will shorten the life of the air conditioner compressor.
2. The air conditioner power supply voltage is unstable
◆ Poor quality of power supply voltage, such as too high or too low voltage, will have an adverse effect on the air conditioner compressor motor, especially if it is used beyond the rated voltage range of the air conditioner compressor. It is the most improper. , Resulting in poor insulation and burnt motor windings. In addition, the unbalanced three-phase voltage or current will also increase the motor loss (iron loss and copper loss), the temperature of the air conditioner compressor motor coil is too high, the overheater is not properly protected, and the air conditioner compressor motor insulation is burned, resulting in a short circuit burn.
3. The refrigeration system is not cleaned up after the compressor burns out
◆ For the air-conditioning refrigeration system that has a compressor failure, the refrigeration system must be thoroughly cleaned. When the air-conditioning compressor motor is burned, strong acids will be generated and reside in the system. After operation, the residual acid will corrode the insulation layer of the air conditioner compressor motor, causing the new air conditioner compressor to burn out.
4. The rotating parts of the air conditioner compressor are stuck
◆ When this happens, if the motor protection fails, the air conditioner compressor motor may be overloaded and burned.
5. The air conditioner copper pipe system is not clean enough
◆ It contains moisture, which also causes poor insulation of the air-conditioning compressor motor; moisture, refrigerant, and refrigeration oil circulate in the system. After high-temperature and low-temperature state changes, acidic substances will be generated, which will damage the motor's insulation layer. The air conditioner compressor motor will burn out after a long working time.
6. Poor compressor cooling
◆ The return air temperature is too high or the return air volume is too low, which makes the compressor motor coil cooling insufficient. For air-cooled heat pump units, this situation occurs more often, and too high return air temperature will also lead to too high exhaust temperature, resulting in a series of air-conditioning compressor problems.
7. The compressor itself has manufacturing process defects
◆ Generally, the air conditioner motor burns out after a short period of time, which may be a problem in the manufacture of the air conditioner compressor.
8, compressor start contactor failure
◆ The contactor's contact resistance is too large or sintered, causing the air conditioner compressor motor to be short-circuited or burned, or the line is poorly connected, and the starting current is large. It is easy to burn the air conditioner compressor.
9. Short circuit caused by metal shavings
◆ The metal shavings in the winding are the culprits of short circuit and low ground insulation value. The normal vibration of the compressor during operation and the winding twisted by the electromagnetic force at each start-up will promote the relative movement and friction between the metal shavings interposed between the windings and the winding enameled wire. Sharp metal chips can scratch the insulation of the enameled wire and cause a short circuit.
10. Use the compressor to evacuate
◆ There are still some on-site construction workers in the refrigeration industry who have retained their past habits. They use compressors to evacuate, and air plays the role of an insulating medium. After the vacuum is evacuated in a closed container, the discharge phenomenon between the electrodes in it will easily occur. Compressor malfunction.
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