The freezer compressor is running without cooling failure (5)
2. Periodic non-refrigeration failure phenomenon of the secondary failure machine: the refrigeration system of the refrigeration system is repaired and the refrigeration is normal. After a day or two, no refrigeration occurs, and the sound of refrigerant circulation is not heard. , And repeat the above process. Failure analysis: The characteristic of ice blockage in the freezer refrigeration system is due to the fact that there is a small amount of water in the refrigeration system, and R12 refrigerant is almost insoluble in water. In the refrigeration system where the evaporation temperature is lower than 0℃, the presence of moisture will freeze the capillary tube and block it. The circulation of refrigerant causes the refrigeration system to stop refrigerating: with the increase of the refrigeration stop time, the temperature in the freezer and the capillary gradually rises, and after the ice in the capillary melts naturally, the refrigerant circulates again for refrigeration, and then repeats the above process. Troubleshooting: Shut down and wait for the capillary ice to melt naturally, and start the compressor to run. Before the ice block appears, use sharp scissors to make a shallow mark on the capillary at the end of the filter dryer, and then break it, using pressure to quickly pass through the two nozzles When the refrigerant is released, most of the water in the system is discharged with the refrigerant. Huan opens the compressor process nozzle, installs a pressure gauge, and blows nitrogen into the system, and then the capillary tube is cut off by the two nozzles to blow out. Dry the system. It is best to repeat it two or three times. Replace the filter drier, blow through the system, evacuate, add refrigerant, and seal. [Note] The ice blocking part is usually in the capillary tube and the evaporator connection nozzle, that is, the freezer room or the freezer body, it is easy to see and touch. It is not easy to heat and melt the ice, and sometimes the freezer body can be damaged by improper operation. Therefore, the simple and reliable method is to stop the machine to melt the ice naturally.
3. The secondary malfunctioning machine is not cooling, the noise is getting louder, and the return pipe is hot. Trouble phenomenon: the original compressor is running normally, the cooling is poor or not cooling: after the system is repaired and evacuated, the refrigerant is added to test the machine, the compressor running sound gradually increases Large, the exhaust pipe is very hot, not cooling, and the pressure gauge quickly changes to a vacuum value. Failure analysis: This is a unique manifestation of the welding blockage of the freezer refrigeration system. It should be shut down immediately. All new welding ports should be considered, but the capillary tube and the filter dryer connection port may be blocked by welding. Troubleshooting: Cut the capillary tubes one by one, damage the filter drier, open the compressor exhaust pipe to let out all the refrigerant in the system (do not use gas welding to open the pipe to vent, so as not to explode or burn). The compressor process tube is used to charge and discharge nitrogen to the system, and perform a blow-through test on the system. Both the drying filter nozzle and the capillary nozzle should be evenly discharged from the gas, otherwise it means that the welding block is still there. Disassemble or cut the capillary tube, filter, compressor, drain all the refrigerant in the system, use gas welding to open the pipe ports that were welded during the last maintenance, and then blow through the system after re-welding. Test until the pipeline is unblocked. Replace the filter drier, check the tightness of each weld with soapy water after pressing the system, then evacuate, add refrigerant, test the machine, and seal.
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