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Display cooler inspection sequence
author: supermarket refrigerated showcase category: commercial refrigeration Views: 520Time: 2016-08-22
display cooler inspection sequence
You must first determine the status of the display cooler through visual inspections such as watching, listening, and touching.
View, listen, and touch the diagnostic fault display cooler 80% of the fault diagnosis, by checking the external refrigeration pipeline for oil stains, whether there is rust on the side of the freezer compartment of the middle door frame, and checking the temperature of the condenser, evaporator, and compressor return pipe The sound of the compressor is determined.
Look at the display cooler. Diagnose the fault observation parts mainly include exposed refrigeration devices and connecting pipes, the side of the freezer compartment of the middle door frame, and the surface of the evaporator.
①There are oil stains, dust or wetness, and black welds in the exposed refrigeration pipeline, 90% of which are leaks.
②The compressor return pipe is frosted, which is only seen in the secondary malfunctioning machine, and the refrigerant is filled in 100% during maintenance.
③ The drier is frosted, mostly due to the display cooler. Moisture enters during the maintenance of the refrigeration system and forms an ice block.
④ The connection between the capillary and the filter is frosted, which is a dirty block.
⑤ There is rust on the side of the freezer compartment of the middle door frame, and the display cooler has been used for more than 5 years, 60% is the leakage of the anti-exposure pipe in the door frame.
The surface of the evaporator has large icy bumps, and most of the inside of the cabinet is separated from the surface of the internal evaporator. Although the surface of the evaporator is full of frost, it is not solid. The first failure is the display cooler. In addition, it may also be an excessive amount of refrigerant; the evaporator surface is not full of frosting, or only partially frosted. 90% of the system has less refrigerant, and some compressors have poor exhaust: no frost on the evaporator surface, 80% % Is that there is less refrigerant, and a few are that the compressor is not exhausted.
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