Fault phenomenon

　　Supermarket display cooler cabinet failures mainly include cabinet door deformation and damage, aging and deformation of magnetic door seals.

　　fault repair

　　A small part of the cabinet body can be repaired by cold working process of fitter, which will not be introduced here. For the display cooler cabinet shell to lose paint, it can be restored by repainting.

　　Use an electric paint removal tool to grind off most of the old paint on the cabinet body (be careful not to damage the refrigeration pipe system).

　　 Then use a scraper and a spatula to remove the paint from the hard-to-reach edges with the electric paint removal tool (be careful not to damage the supermarket display cooler door seal).

　　] After applying a layer of anti-rust paint (usually red lead), use putty to fill in the unevenness, and finally polish it with a diamond drill.

　　Use automatic painting method to repaint the cabinet body, and pay attention to uniformity during operation.

　　Maintenance example

　　 Failure phenomenon: A BCD-220 supermarket display cooler compressor runs for a long time before it stops.

　　 failure analysis: power on, let the machine work continuously for several hours, it is found that the temperature of the refrigerating compartment cannot drop and the compressor does not stop. After inspection, it was found that the refrigerator compartment evaporator of the machine did not form frost, but only a large amount of water drops, which may be insufficient refrigerant. I used the repair valve to fill the refrigeration system with refrigerant until a short period of frost formed in the low-pressure return pipe (indicating that the refrigeration system was not malfunctioning), but after observing the operation of the supermarket display cooler for a period of time, it was found that the malfunction was not eliminated. Check the refrigerating room again, the rear wall is bulging, and you can find that there is a certain gap between the rear wall and the evaporator by pressing with your hand, and the maximum distance exceeds 5mm, so the reason for the fault is here. Because the back wall bulges and separates from the evaporator, an air cavity is formed between them. The air that does not flow in the cavity is a poor conductor of heat energy. The heat outside the refrigerating room cannot be well conducted to the evaporator, and the heat exchange is blocked, causing the supermarket display cooler The temperature of the refrigerator compartment does not drop.

　　 Troubleshooting: Because the back wall is swelled due to stress, it cannot be reset even if it is pressed with a lot of force. The best maintenance method is to dig out the insulation material behind the display cooler in the supermarket, and then re-foam after the rear wall is firmly bonded to the evaporator, but this is expensive. If the method of butting after cutting is used, it is not easy to butt tightly, and the overall strength and sealing performance will be reduced. Finally, use a hair dryer to heat the back wall panel to soften it and gradually push it to both sides, while heating it while pushing, pushing the excess part caused by the bulging deformation to the corner to form a small wrinkle, which will not affect the supermarket display cooler. Exterior. Turn on the refrigerator, frosting is normal, the boxThe internal temperature also meets the requirements. The compressor can start and stop normally. Finally, discharge some of the refrigerant in the system, observe that the compressor suction pressure is 0.04MPa, and observe after sealing. The supermarket display cooler is working normally and the fault is eliminated.