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Walk-in cooler secondary failure unit refrigeration difference analysis (2)
walk-in cooler secondary failure unit refrigeration difference analysis (2)
3. The secondary failure unit has poor cooling and condenser heating. Sudden failure phenomena: poor cooling, condensation The heat of the device changes unevenly, that is, local heating and hot hands, and the local temperature is the same as room temperature. Failure analysis: the refrigeration system is not cleanly evacuated. Troubleshooting: unplug the walk-in cooler power supply, open the compressor process nozzle to vent, about 2 cm from the nozzle of the filter dryer, cut off the capillary, inject nitrogen into the walk-in cooler system, blow through the refrigeration pipeline, and replace the drying filter The system is blown through, evacuated, and filled with refrigerant again.
The secondary failure machine has poor cooling, and there is snoring and sound. Fault phenomenon: The cooling is poor, and the compressor is running with snoring and sound. Failure analysis: the system is not clean when pumped out. Troubleshooting: unplug the walk-in cooler power supply, open the compressor process nozzle to vent, about 2 cm away from the nozzle of the lower drying filter, cut off the capillary, inject nitrogen into the system to blow through the refrigeration pipeline, replace the dry filter, and restart Blow through, evacuate and fill the system with refrigerant.
The secondary failure unit has poor cooling, high noise, and the condenser is hot and cool. Trouble phenomenon: poor cooling after repaired by others, uneven whistling sound, hot hands touching the top of the condenser (higher than normal), medium, The lower part is the normal temperature fault analysis: the refrigeration pipe is slightly blocked, and more than 90% of the refrigeration pipes are not clean when evacuated. Troubleshooting: Perform the following two steps.
①Cut the capillary tube to release air, and blow through the refrigeration pipeline.
②Replace the filter, evacuate, fill with refrigerant, and seal.
6. The secondary failure machine has poor refrigeration and the return pipe is frosted. Trouble phenomenon: poor refrigeration, the compressor return pipe is frosted after 40-60 minutes of starting up. Failure analysis: a unique manifestation of excessive refrigerant filling. Troubleshooting: It depends on whether the refrigeration system is sealed or not and the refrigerant model.
①The refrigeration system has not been sealed, and a little refrigerant has been discharged. The maintenance site should be well ventilated and there should be no open flames around. For walk-in cooler models using R600a refrigerant, which is flammable, explosive and heavier than air, you must pay special attention to it. At the same time, you should turn on the ground exhaust fan.
②For the models with the refrigeration system sealed, open the refrigeration system to discharge all the refrigerant, and then blow through the system again, replace the filter drier, evacuate, add refrigerant, and seal. Note that for models that use R600a refrigerant, the machine must be tested and can automatically shut down more than two times before it can be sealed to avoid rework.
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the above articles are from refrigerated showcase display cooler, display cooler prices, for details, please visit: www.ihdjx.com
free order hotline: +86 18019567573
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