Ten reasons for the burning of air conditioning compressors
1. The air conditioner compressor starts frequently
◆ During the starting process of the air conditioner compressor, there is generally a step-down starting circuit, but the starting current will exceed several times the rated current, and the starting temperature of the air conditioner compressor motor will rise very quickly. If the temperature of the air conditioner is not set properly, the cooling temperature is too low, and the heating temperature is too high, the air conditioner compressor will be switched on and off frequently, which will shorten the life of the air conditioner compressor.
2, the air conditioner power supply voltage is unstable
◆ The quality of the power supply voltage is not good. If the voltage is too high or too low, it will have a bad effect on the air conditioner compressor motor, especially if it is used outside the rated voltage range of the air conditioner compressor, it is the most improper. Long-term operation makes the air conditioner compressor motor in an inefficient and overheated state. , Resulting in poor insulation and burning of motor windings. In addition, the unbalanced three-phase voltage or current will also cause the increase of motor loss (iron loss and copper loss), the temperature of the air conditioning compressor motor coil is too high, the overheater protection is improper, the air conditioning compressor motor insulation is burned, and the air conditioning motor coil is short-circuited. burn.
3. The refrigeration system was not cleaned up after the compressor burned out
◆ For air-conditioning refrigeration systems with compressor burnout failures, the refrigeration system must be thoroughly cleaned up. When the air-conditioning compressor motor burns out, strong acid will be generated and stay in the system. If it is not cleaned, it will be used as a new air-conditioning compressor motor. After operation, the residual acidic substances will corrode the insulation layer of the air conditioner compressor motor, causing the new air conditioner compressor to burn.
4, the rotating parts of the air-conditioning compressor are stuck
◆ When this happens, if the motor protection fails, the air conditioner compressor motor may be overloaded and burned.
5. The air conditioning copper pipe system is not clean enough
◆ It contains water, which can also cause poor insulation of the air conditioner compressor motor; water, refrigerant and refrigerating oil circulate in the system, after high and low temperature changes, acidic substances will be generated, which will damage the motor's insulation layer. The compressor motor of the air conditioner will burn out if the working hours are long.
6. Poor compressor cooling
◆ The return air temperature is too high or the return air volume is too low, resulting in insufficient cooling of the compressor motor coil. For air-cooled heat pump units, this situation occurs frequently, and the return temperature is too high, which will also cause the exhaust temperature to be too high, causing a series of air-conditioning compressor problems.
7, the compressor itself has manufacturing defects
◆ Generally, the air conditioner motor burns out after a short period of time. This 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-conditioning compressor motor to be short-circuited and burned, or the line is poorly connected, and the air-conditioning compressor is easily burned if the starting current is large.
9. Short circuit caused by metal shavings
◆ Metal shavings in the windings are the main culprit for short circuits and low ground insulation. The normal vibration when the compressor is running, and the twisting of the windings by electromagnetic force every time it starts, will promote the relative movement and friction between the metal shavings contained in the windings and the winding enameled wire. Sharp metal shavings can scratch the enameled wire insulation and cause a short circuit.
10. Vacuum with compressor
◆ In the refrigeration industry, there are still some on-site construction workers who have kept the past habit of using compressors to vacuum, and air plays the role of insulating medium. After vacuuming in a closed container, the discharge between the electrodes inside is easy to occur. Cause the compressor to malfunction.
