The compressor is the most important part of the refrigeration system of the air conditioner. Since the compressor is different from the non-moving parts such as the condenser and the evaporator, it needs to run at a high speed during the system operation, and it is also a high-precision device of electromechanical integration. Failures often occur in actual use.

Some common faults

Phenomenon 1: The winding is short-circuited, open-circuited, and the winding touches the chassis ground. This kind of fault is caused by the motor part of the compressor. When the fault phenomenon is open, the power supply is normal, and the compressor does not work; when the short circuit and the shell are energized, the protector acts or burns the fuse.

Phenomenon 2: The compressor holds the shaft and the cylinder is stuck. If the compressor loses oil or contains impurities, it will often cause the shaft to be stuck or the cylinder to be stuck.

Phenomenon 3: The thermal protector is damaged. The thermal protector is an accessory of the compressor, and the fault is generally an open circuit or a smaller operating temperature point. This problem is often confused with a slight short circuit between turns of the winding. The difference is that the working current is normal when the thermal protector is damaged, and the current is too large when the winding is short-circuited.

Phenomenon 4: The suction and discharge valves of the compressor are not closed tightly. If the suction and discharge valves of the compressor are damaged, even if the refrigerant is sufficient, the system cannot establish high and low pressure or it is difficult to establish qualified high and low pressure, the system will not refrigerate or the refrigerating effect will be poor.

Phenomenon 5: Vibration and noise of the compressor. This kind of problem often occurs in repair work. Generally, it does not have much impact on the refrigeration performance, but it will make the user feel abnormal. The cause is often the collision between the pipeline and the casing, the loosening of the fixing bolts of the compressor and the falling off of the damping block. Wait.

How to repair a compressor

Method 1: percussion method. After starting the machine, use a wooden hammer to knock the lower half of the compressor, so that the stuck parts inside the compressor are vibrated and run.

Method 2: capacitor starting method. You can use a capacitor with a larger capacitance than the original to connect to the circuit to start.

Method three: high pressure start method. You can use a voltage regulator to increase the power supply voltage and start it.

Method four: pressure relief method. Start after all the refrigerant in the system is emptied.

If the above repair methods do not work, then only replacement.