Why do central air-conditioning compressors often fail?

Why do central air-conditioning compressors often fail? A little common sense in the air conditioning industry knows that whether it is cooling or heating, the compressor plays a key role, which can be said to be the heart of air conditioning. The configuration of the compressor is very complicated, and it is also very difficult for many old driver masters to repair, which is also the most undesirable effect for many users. So why do central air-conditioning compressors often fail? The following explanation is made for this problem: 1. Central air-conditioning compressor start contactor failure The contactor's contact resistance is too large or sintered, which causes the air conditioner compressor motor to burn out or the circuit is poorly connected. The large starting current is easy to burn the air conditioner compressor. 2. The power supply voltage of the central air conditioner is unstable If the power supply voltage is too high or too low, it will have an adverse effect on the motor of the air conditioner compressor. Especially when the voltage exceeds the rated voltage range of the air conditioner compressor, long-term operation of the air conditioner causes the compressor motor to be in an inefficient overheating state, resulting in poor insulation and burning of the motor winding. In addition, 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. Poor cooling of the central air-conditioning compressor The return air overheating control of the air conditioning system is poor, 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. 4. The central air-conditioning 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. 5. The rotating parts of the central air-conditioning compressor are stuck When this happens, if the motor protection fails, the air conditioner compressor motor may be overloaded and burned. 6. The cleanliness of the central air conditioning copper pipe system is not 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 insulation layer The motor of the air-conditioning compressor will burn out after a long operation. 7. The refrigeration system is not cleaned up after the central air-conditioning compressor burns out For the air-conditioning refrigeration system that has a compressor burn-out failure, the refrigeration system must be cleaned thoroughly. When the air-conditioning compressor motor is burned, strong acids will be generated and reside in the system. After that, the residual acid will corrode the insulation layer of the air conditioner compressor motor, causing the new air conditioner compressor to burn out. Why do central air-conditioning compressors often fail? After the above explanations, we know that these reasons should be suppressed after knowing these reasons, and maintenance work should be done in advance to achieve environmental protection and save an unnecessary cost.

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