Have You Encountered the Three Common Problems of Refrigeration Compressors?

I.

Process and Treatment of Refrigeration Compressor Shaft Seizure and Cylinder Locking, Which Prevent the Compressor from Starting Normally

1. When the refrigeration compressor fails to start normally and is accompanied by a "buzzing" noise, through measurement, it is found that its actual current exceeds the rated current, and the thermal protector keeps cycling between activation and reset, and the refrigeration system has an over - current protection. After measurement, it is found that the winding resistance values between the three terminals of the refrigeration compressor are normal. Therefore, it can be judged that the compressor has shaft seizure or cylinder locking.
2. For slight shaft seizure or cylinder locking, we can use 380V three - phase electricity to increase the torque of the compressor and force it to start. If it cannot be forced to start, only disassembly for treatment is left.

II. Judgment and Treatment of Poor Refrigeration Effect Caused by Refrigeration Compressor Gas Leakage

1. When the refrigeration system is powered on and operating, the external fan and the compressor of the system can work normally, but the air output is not cold. Through measurement, it is found that its working current is only 3.5A, which is obviously on the low side. Then, the static pressure of the system is measured to be 11 Kg/cm, indicating that there is sufficient refrigerant in the system. After turning off and restarting the compressor in Chongqing, it is found that the low - pressure is 8 Kg/cm, which is obviously on the high side. Touching the compressor with the hand again, it is found that the exhaust pipe is not very hot, and the return pipe is not cold either. To sum up, if the low - pressure of the system rises and the temperature difference between the suction and discharge of the refrigeration compressor is small, it can be judged that the compressor has gas leakage.
2. Regarding the gas - leakage problem of the refrigeration system, it is necessary to first determine whether it is the compressor or the four - way valve that has gas leakage, and then take corresponding treatment measures.

III. Reasons and Treatment of Poor System Refrigeration Effect Caused by Refrigeration Compressor Shaft Seizure and Cylinder Locking

1. The external environment of the air - conditioning system operation is good, and the power supply voltage is also normal, but it does not heat. Five minutes after starting up, although the external fan has been running, the internal fan does not start for a long time. The input voltage of the compressor can reach 220V, but the starting current exceeds 15A. Through inspection, it is found that the wiring, capacitor, and winding of the compressor are normal. Even replacing a larger capacitor for starting does not improve the situation at all.

   

   Using 380V voltage for instant starting and tapping still has no effect. Therefore, it can be judged that the compressor has shaft seizure and cylinder locking.
2. Common treatment methods for refrigeration compressor shaft seizure and cylinder locking are as follows:
   • a. First, check and confirm whether the wiring of the refrigeration compressor is correct and whether the capacitor of the fan is damaged.
   • b. After discharging the fluorine and relieving the pressure, repeatedly use a large capacitor to drive it.
   • c.

     

     Use high - voltage electricity for instant starting. Note that the duration of this process should not be too long, and always keep in mind "instant".

     

   • d. There are many reasons for compressor shaft seizure and cylinder locking, but the common ones are still the problems of the refrigeration system itself. Therefore, if the refrigeration compressor needs to be replaced, other problems of the refrigeration system must be dealt with first before replacement.