What faults frequently occur after the air conditioner is moved
Refrigeration system failures are common faults in our maintenance. The failure phenomena are also various and strange, but there are still rules to follow and experience can be used for reference. What is introduced here is the inspection steps for the failure of the air-conditioning refrigeration system. Although it is not necessary, the maintenance should be carried out according to this idea.
1. Main points of refrigeration system maintenance
1. Observe the working conditions of the internal and external machines: such as the display of the indicator board, whether the internal machine is working, whether the wind speed output is normal, whether the fan and compressor of the external machine are running, so as to determine whether it is an electrical problem or a system problem.
2, check the data of the air conditioner:
A. The running water condition of the air conditioner. Generally, the continuous air conditioner with dripping water in the internal unit is normal, but it can only be used as a reference value due to the influence of environmental humidity and temperature.
B. Temperature difference between inlet and outlet. Normal temperature difference between inlet and outlet should be 12-14 degrees, but it will also be affected by ambient temperature and wind speed.
C. Measure the pressure value of the system pipeline. Generally, the low pressure pressure is 0.45Mpa-0.50Mpa during refrigeration, and the high pressure pressure is between 1.8Mpa-2.2Mpa during heating, but the pressure is affected by the ambient temperature. The higher the air-conditioning inlet temperature, The higher the exhaust pressure, the higher the condensation temperature, and vice versa; the greater the air conditioning load, the higher the suction pressure, and the higher the evaporation temperature (the normal evaporation temperature of the evaporator is between 5-7 degrees).
Second, the type of refrigeration system failure
1. The refrigeration system is blocked:
often occurs at the capillary tube and the filter drier, because these two places are the narrowest places in the system. There are three common causes of blockage: dirty blockage, ice blockage and welding blockage.
A. Dirty blockage usually occurs at the inlet of the capillary tube, because the dirt in the system (such as welding slag, rust, oxide skin, etc.) blocks the pipeline. Lightly tapping the capillary during inspection may temporarily return to normal. In addition, the location and nature of the blockage can be judged from the condensation, frosting on the surface of the pipeline and components, and the pressure recovery speed time during shutdown.
B. Ice blockage generally occurs at the outlet of the capillary. It is because the system contains water, which suddenly vaporizes and cools at the outlet of the capillary and condenses into small ice particles to block the outlet of the capillary. When judging, you can use the welding torch to heat the capillary if it works. Returning to normal or improving means that it is an ice block, or the machine can be cooled for a period of time after the air conditioner is turned off, indicating that it is an ice block. The ice block generally occurs on a newly installed or newly repaired air conditioner.
C. Welding blockage generally occurs at the welding place of the capillary tube. The phenomenon is similar to the dirty blockage and ice blockage, and it mostly occurs on newly installed machines.
2, the refrigeration system leaks:
The carrier of air conditioner cooling and heating is refrigerant. If the system has leaks, if the system leaks, the air conditioner has poor cooling or no cooling at all. The leaks of the air conditioner are mainly concentrated in the welding joints, capillary welds, and compression of the two units. The machine suction and exhaust pipes, bell mouths, copper-sodium cracks, connecting pipes, etc., can be visually inspected first when checking, focusing on checking the joints of the connecting pipes, and there are usually oil stains in the leaks.
3, four-way valve failure:
It usually occurs when the four-way valve is not closed well, blows air or stuck, causing poor heating performance. When judging, the four-way valve can be turned on and off to hear whether the suction is good or not, and it can be repeated during maintenance. Energize the four-way valve or tap the four-way valve lightly to reset it.
4, check valve failure:
The one-way valve is directly connected during cooling, but the refrigerant must pass through the auxiliary capillary tube during heating. When the one-way valve is not tightly sealed or the auxiliary capillary tube is blocked, the heating is affected. Therefore, if the air-conditioning is normal but heating In case of bad, check the one-way valve after troubleshooting the four-way valve.
