Common faults and solutions of refrigeration compressors
1. The compressor fuse is blown, find out the reason and replace with a new fuse. 2. The connector connecting the electromagnetic clutch is off or in poor contact, and reconnect it. 3. The solenoid clutch coil is burned out, replace the coil. 4. Pressure switch failure: Whether there is refrigerant in the system, the pressure switch circuit or the pressure switch body is faulty. 5, the refrigeration system leaks 6. Compressor failure (high and low pressure valve spool gas, pulling cylinder, stuck cylinder, etc.), replace the compressor. 7. Expansion valve failure (the temperature sensor leaks or falls off), replace the expansion valve of the same model. Compressor suction pressure is normal, discharge pressure is too high 1. If there is air in the system, vacuum and fluorine should be added again. 2. Excess refrigerant should be discharged. 3. There are sludge and debris on the condenser fins, which affect its heat dissipation, so the condenser should be cleaned. 4. The condenser fan does not work, the fan should be repaired or replaced. 5. The reservoir dryer is blocked, the reservoir dryer should be replaced. 6. If the pipeline is blocked, the blockage should be removed, and the refrigerant should be refilled with vacuum. 7. The air volume of the condenser is insufficient, and the fan should be readjusted or replaced. Compressor suction pressure is too high, discharge pressure is too high 1. Too much refrigerant. Too much refrigerant will cause the suction pressure and discharge pressure to be too high at the same time. This is because when too much refrigerant fills the reservoir, it will occupy a part of the condenser volume, reducing the heat dissipation area and causing the condenser Poor condensation. Discharge the excess refrigerant from the low pressure side. 2. The opening of the expansion valve is too large, which reduces the throttling effect, the refrigerant cannot fully vaporize and absorb heat, causing the low-pressure pressure to rise, and liquid refrigerant flows back to the compressor, resulting in liquid shock. The adjusting nut of the expansion valve can be tightened half a turn to two turns to adjust the low pressure pressure to the normal range. 3. The compressor suction valve is broken, so that the compressor cannot suck the refrigerant gas in the evaporator, which will cause the low pressure to be too high. At this time, the compressor should be replaced. 4. The inlet air temperature of the evaporator is too high. When the ambient temperature is high, the return air temperature of the evaporator will also be high, so that the low pressure will also increase. At this time, it is possible that the fresh air mechanism is broken and the fresh air door cannot be closed when opened. 5. Air is mixed into the system. Since air is non-condensable gas, there is air in the refrigeration pipeline, which will increase the system pressure. The treatment method is to completely release the refrigerant, re-evacuate, leak check, and add new refrigerant. 6. The expansion valve temperature-sensitive bulb is not adiabatically wrapped or the wrapping is not good, which will cause the expansion valve to open too much, and the low pressure will be higher. The temperature sensing bag should be re-wrapped 7. The condenser fan does not work. The condenser fan should be repaired or replaced. 8. The air volume of the condenser fan is insufficient. Check whether the fan circuit is poorly connected, whether the fan is blocked by foreign objects, whether the condenser fins have too much dust, and find out the cause of the fault and eliminate it. Compressor suction pressure is too high, discharge pressure is normal 1. The inlet air temperature of the evaporator is too high. When the ambient temperature is high, the return air temperature of the evaporator will also be high, which will increase the low pressure pressure. At this time, it is possible that the fresh air mechanism is broken and the fresh air door cannot be closed when opened. 2. The opening of the expansion valve is too large, and the opening of the expansion valve should be reduced. 3. The suction valve of the compressor is damaged, and the suction valve should be replaced. 4. If the expansion valve temperature sensing bag is loose or poorly insulated, it should be tightened to ensure good contact and strengthen heat insulation protection. Compressor suction pressure is too low, discharge pressure is too low 1. The refrigerant in the system is insufficient. This will cause the suction pressure to be too low and the discharge pressure to be low. In the sight glass, bubbles can be seen flowing. 2, dirty blockage. When there is debris or oil in the refrigeration system, it will cause blockage at the expansion valve or receiver dryer. At this time, there is a significant temperature difference between the front and rear pipelines of the receiver dryer or frost is formed at the expansion valve. At this time, replace the receiver dryer, clean the expansion valve, then re-evacuate, and add refrigerant. 3. Bing block. When there is water in the refrigeration system, when the water passes through the orifice of the expansion valve, because the temperature is lower than 0℃, the water will freeze around the orifice and block the system, causing the suction pressure to be too low. Intermittent cooling occurs. The ice blockage can be eliminated by replacing the dryer to absorb excess water in the system. 4. The gas in the expansion valve bulb has leaked. After the gas leaks, the expansion valve hole will be closed or closed, making the pipeline blocked. In this case, replace it with a new one 5. The compressor piston wears seriously, causing the compressor efficiency to drop. The compressor should be repaired or replaced. 6. If the compressor suction valve is leaking or the discharge valve is damaged, replace the compressor. 7, the compressor cylinder gasket leaks. The cylinder seal should be replaced. The suction pressure of the compressor is too high and the discharge pressure is too low 1. The compressor exhaust valve is broken. It prevents the compressor from discharging high-temperature and high-pressure refrigerant gas into the high-pressure pipeline, resulting in too low high pressure. The exhaust valve should be replaced. 2. Excessive opening of the expansion valve reduces the throttling effect, and a large amount of refrigerant flows into the evaporator, which makes the suction pressure too high and the discharge pressure lower. The adjusting nut of the expansion valve can be tightened half a circle to two times until its opening is proper and the suction and discharge pressures are normal. 3. The low-pressure filter of the press is blocked, remove the dirt, re-evacuate and add fluoride. Overheating protection for household air-conditioning compressors during operation 1. The outdoor unit heat sink is too dirty, just clean the heat sink. 2. If the fan speed drops, use the water pipe to clean the outdoor unit fins and try. If the fan speed drops, it is mostly caused by the decreased capacitance or short circuit of the motor coil. 3. The indoor unit filter is too dirty, and the cooling effect will be better if cleaned in time. 4. There are too many freons. The master who needs to check the pressure, then vacuum, and add fluorine after collecting fluorine. 5. The vacuum of the refrigeration system is incomplete, the refrigerant contains water or the refrigerant label is wrong. The refrigerant replacement should be a high label instead of a low label. The heat dissipation around the compressor is not as good as it is just in the corner, and the air-conditioning compressor is under the sun No shelter! There are also too many indoor places or too much space causing overload operation.
