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What are the common failure characteristics and maintenance of display cooler
display cooler Common failure characteristics and maintenance
No cooling or cooling difference characteristics and maintenance
Refrigeration system leakage After the refrigeration system leaks, the refrigerant in the system is low, and the
display cooler's cooling effect decreases, and the display cooler is in The temperature is not up to the requirements, the thermostat is always in the always on state, which causes the compression to run for a long time. Different parts of the refrigeration system have different faults after leakage caused by abnormalities. The specific manifestations are: the evaporator is not full of frost or the frost layer is uneven, sometimes half of the frost is formed or not at all; the condenser is not hot or has a small hot area ; Open the freezer door and listen for the hissing sound of the refrigerant circulating. The compressor operating current is lower than the normal value. Unplug the power and open the compressor process nozzle. The refrigerant discharge is less.
Exposed refrigeration pipeline leakage 95% of the leakage points in this part have oil stains or black welds, the cooling effect of the display cooler gradually deteriorates, the total pressure does not leak, and the high pressure leaks. Because there is a refrigerating oil cavity in the compressor, and the refrigerating oil is compatible with the refrigerant, oil stains can usually be seen on the surface of the leak when the refrigeration pipeline leaks. The total pressure gauge is generally 0.5MPa, and the high-pressure pipeline micro-leakage needs to be hit with a pressure of 1.2MPa to detect.
Maintenance method: First, open the refrigeration system to bleed, suppress and find the leak (usually at the oily spot), after repairing the welding, the refrigeration system is evacuated, filled with refrigerant, tested, and sealed.
leakage of the anti-exposure tube This part of the leak usually causes the display cooler to suddenly become uncooled, and there is corrosion on the side of the freezer compartment of the middle door frame. Generally, the total pressure does not leak, and some of the high pressure leaks, and some do not leak. Repair method: remove the anti-exposure tube and use it. Remove the anti-dew tube, the display cooler will lose the anti-dew function, but it will not affect the cooling.
The leakage of the internal evaporator of the display cooler causes the cooling effect of the display cooler to gradually deteriorate, and the total pressure or low pressure is leaked. Maintenance method: re-inlay the finished product or self-made evaporator, blow through the system, and check the tightness of the system After it is normal, evacuate, add refrigerant, test machine, and seal.
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