Keep the air conditioning system running (the engine should maintain a certain speed, usually 1500r/min, if only idle speed will affect the accurate diagnosis of the fault), observe the pressure gauge group (for R12 or R-134a, the normal working pressure is: The low pressure side is 1.8 ~ 2.1kgf/cm2, the high pressure side is 12 ~ 14kgf/cm2, 13 ~ 15kgf/cm2), if not in this range, the air conditioning system failure. There are mainly the following situations:
If the measured high pressure value is slightly low, the low pressure value is low or too low, there are two possibilities: first, the system is insufficient refrigerant, should be added to the right amount. Second, the high pressure road is deformed by external force and caused by blockage or blockage for the liquid storage dryer, and the feel temperature of the inlet and outlet of the liquid storage dryer is different. The temperature at the entrance is "hot" hand, the temperature at the exit is "hot" hand, if the dryer is blocked, the temperature difference between the two will increase, the more serious the blockage, the greater the temperature difference will be. The treatment method is to replace the squeezed high pressure road or the blocked liquid storage dryer, and clean the condenser if necessary.
If the high and low pressure values are too high, there are six possibilities: First, there is air in the system, and refrigerant should be completely evacuated again. Second, the system is blocked, mostly for expansion valve blockage or failure, the treatment method is to replace the expansion valve. The third is excessive refrigerant, as the exhaust port feel "hot" hand, suction mouth feel "hot" hand, under normal circumstances, the feel temperature should be "cool" hand, the compressor accompanied by liquid tapping sound, should be thoroughly evacuated, quantitative refrigerant. Fourth, the heat dissipation of the condenser is not cool, which is manifested as the feel temperature of the condenser outlet to the expansion valve inlet section is "hot", and the feel of the section should be "warm" under normal circumstances. The treatment method is to clean the dirt of the condenser and the radiator grid of the water tank, and replace it if necessary. Fifth, the expansion valve failure, manifested as a large amount of dew or frost at low pressure, the treatment method is to check whether the installation position of the expansion valve is correct, if correct, replace the expansion valve. Six is other failures, such as cooling fan failure, engine overheating, refrigerator oil excess or insufficient.
If the low pressure value is high and the high pressure value is low, it is mostly because the compressor cannot be effectively compressed and internal leakage occurs. The performance is that the electromagnetic clutch of the compressor can not pull normally, there is a slippage phenomenon, and the drive belt of the compressor is slippage, and there is an obvious mechanical noise during operation. The treatment method is to adjust the gap of the electromagnetic clutch or replace the electromagnetic clutch and compressor according to the corresponding manual.
High pressure value is too high, low pressure is too low, there are two possibilities: first, the expansion valve is blocked, due to the failure of the liquid storage dryer, dirt into the expansion valve caused by blockage. The second is the failure of the power component, mostly because the temperature sensing bag runs, so that the valve is in a normally closed state. The treatment method is to replace the expansion valve and the liquid storage dryer.
If the measured high pressure value is normal, the low pressure value is too high, and the ratio of high and low pressure values is much less than 8, this phenomenon is generally the compressor working effect is reduced, the compressor should be repaired and replaced if necessary. If the ratio of high and low pressure values is slightly less than 8, it is the temperature sensing installation position of the expansion valve.
The above is the content shared by the surrounding help about how to deal with the broken air conditioner. I hope our sharing will be of good help to everyone in the future life. At the same time, I also hope that everyone should take more care of the air conditioner when using the air conditioner, in addition to the air conditioner must be cleaned and maintained when not in use. Because the air conditioning has been used for a long time, the parts of many machines and equipment are very fragile. Make sure you give him maintenance at this time. If the air conditioner encounters problems in the process of use, you can refer to the content we share to find the corresponding solution. If the bad is more serious, it is recommended to find the surrounding help for air conditioning maintenance.