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display cases Cooling difference analysis of secondary faulty machine
author: supermarket refrigerated showcase category: walk-in display coolers Views: 721Time: 2016-08-22
display cases Cooling differential analysis of secondary faulty machine
[Explanation] The secondary faulty machine is the display cases. It is still abnormal after repair, or normal after repair, but users use less than two In the same month, another malfunction occurred and even display cases of other new malfunctions were added.
The primary and secondary failures have poor cooling and uniform changes in the heat of the condenser. Trouble phenomenon: poor cooling, the heat of the condenser changes uniformly, but the heating area is small. Failure analysis: less refrigerant or poor compressor performance. Troubleshooting: It depends on whether the system is sealed or not.
①The refrigeration system has not been sealed: continue to add some refrigerant, if it still does not work, press ② to perform maintenance.
②The refrigeration system has been sealed: plug in the power and run the compressor for 10 to 20 minutes, and open the compressor process port to vent when it continues to run. If no gas is discharged, the compressor is basically normal, and the fault is caused by refrigerant leakage. Check for leaks, blow through the pipeline, evacuate, fill with refrigerant, and seal: If a large amount of refrigerant is discharged, check the compressor At this time, unplug the display cases power supply, weld the compressor exhaust pipe, and then plug in the display cases power supply to make the compressor run. Use your thumb to block the exhaust pipe port. If it is easy to block, it means the compressor If the performance becomes worse, the valve should be opened to clean up carbon deposits or the compressor of the same model should be replaced.
Second, the second fault machine has poor cooling and the condenser has only 1/3 micro-heat. Failure phenomenon: After repaired by others, the cooling is poor, the upper part of the condenser is slightly hot, and the middle and lower parts are normal temperature. Fault analysis: Most of the refrigerants are filled with less or the compressor has poor exhaust performance, and some are slightly blocked in the refrigeration pipeline. Troubleshooting: For the sealed models, follow the steps below; for the unsealed models, add some refrigerant first, if it still fails, then follow the steps below.
①After starting the refrigeration for 10 to 20 minutes, open the compressor process tube to vent while the compressor continues to run. If a large amount of gas is discharged, it indicates that the compressor's discharge performance has deteriorated. After verification, replace the compressor of the same model: if there is no sound of gas discharge, but there is a sound of suction, it means that the filled display cases are less refrigerant or the refrigeration pipeline If it is slightly blocked, press ② to perform maintenance.
②Cut the capillary to deflate. If there is a sound of gas discharge on both sides of the capillary tube, it means that there is less refrigerant filling: If there is a sound of gas discharge from only one nozzle, it means that the refrigeration pipeline is slightly blocked, and the refrigeration pipeline should be blown through.
③Replace filter, evacuate, add refrigerant, test machine, and seal.
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