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Display cooler secondary failure machine has high noise (two)
author: supermarket refrigerated showcase category: commercial refrigeration Views: 999Time: 2016-08-22
display cooler secondary failure machine has high noise (two)
5. Indirect cooling fan noise is large. Failure phenomenon: fan running noise is large, others are normal. Fault analysis: Most of the fan motors are installed incorrectly, and a few are fan motors. Troubleshooting: first try to adjust the position of the fan, if not, replace the fan motor.
6. The noise becomes louder and no cooling during the filling process (2) Trouble phenomenon: The original machine has poor cooling. After the display cooler refrigeration system is repaired, the noise becomes very loud and still not cooling. Failure analysis: the unique phenomenon of welding blockage in refrigeration pipelines, it is possible to newly weld each nozzle, but the failure rate of the capillary and the filter drier is the highest. Troubleshooting: Unplug the power plug, and cut off the capillary to deflate the air. Which tube port has no gas discharge, indicating that there is a blockage in the side of the pipeline, which will be described separately below.
①If there is no gas from the outlet of the filter drier, it means that the high pressure side is blocked. Use a pliers to break the filter and continue to deflate, open the compressor process tube, and install the pressure gauge, and blow through the refrigeration pipeline. When gas is discharged from the nozzle, it indicates that the refrigeration pipeline is unblocked.
②If there is still no gas discharged from the capillary side nozzle, it means that the low pressure side is blocked. After opening the compressor process tube to vent, blow through the refrigeration pipeline with nitrogen to see if it is unblocked.
③There is no gas from the two nozzles. It may be that the capillary nozzle is sealed again during the cutting process. The two nozzles should be re-cut, and then the methods ① and ② are used. After the refrigeration pipeline is unblocked with nitrogen, replace the filter drier, evacuate, fill with refrigerant, and seal.
[Note] To repair this kind of fault, be sure to confirm whether all the refrigerant in the system is discharged before gas welding, otherwise it will cause serious consequences such as explosion.
7. The second fault machine has high noise and poor cooling. Failure phenomenon: After repairing the refrigeration system, the startup noise is large and the cooling is poor. Failure analysis: the refrigeration pipeline is not cleanly evacuated. Troubleshooting: Unplug the display cooler power plug, open the compressor process tube to vent, evacuate, fill the refrigerant, and seal the refrigeration pipeline.
8. The noise becomes louder after inlaying the self-made evaporator. Trouble phenomenon: The sound of refrigerant flowing becomes louder after inlaying the self-made evaporator. Failure analysis: Generally, the newly configured capillary tube has burrs or flattening. Troubleshooting: After opening the compressor process tube to deflate, weld the two capillary nozzles, re-cut the nozzles to make the tube smooth and free of burrs, then weld the capillary tube, evacuate the system, add refrigerant, and seal.
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