supermarket refrigerated showcase » article > display refrigerator > display cases Defrost thermostat and superheat insurance disassembly, diagnosis and maintenance
display cases Defrost thermostat and superheat insurance disassembly, diagnosis and maintenance
display cases Defrost thermostat and superheat safety disassembly, diagnosis and maintenance
Currently the most common refrigerated showcase display cases, defrost thermostat It is connected with super heat insurance, so the two will be introduced together. The defrosting thermostat can automatically control the temperature of the defrosting evaporator to prevent the food in the freezer from melting when the defrosting temperature is too high.
1. Defrosting thermostat and superheat fuse disassembly and assembly are defrost thermostat and superheat fuse disassembly. Unplug the power plug of the display cases, remove the air duct grid of the freezer, find the defrost thermostat and superheat insurance, and unplug the corresponding wiring plugs along the line, a fixed clip and the defrost thermostat along the thick liquid tank Slide the end to the thin end, take out the defrosting thermostat, cut off the plastic clip that fixes the defrosting superheat insurance, and remove the defrosting superheat insurance. The installation of the defrost thermostat and the super heat safety is the reverse process of disassembly. [Note] Do not squeeze the transparent plastic sealing sleeve of the defrost thermostat to avoid air leakage and water ingress. When installing, the defrost thermostat should be close to the liquid tank, because it controls the on-off of the internal contacts by sensing the temperature of the liquid tank to achieve defrost temperature control. The defrosting and superheat insurance must be installed in the original position to achieve the safety fuse effect, generally in the upper middle of the side of the evaporator, remember not to place it at will, let alone omit it. refrigerated showcase Cold display cases The original fixed position of defrosting thermostat and super heat insurance.
2. When the diagnosis and maintenance of the defrost thermostat is normal, the sealed plastic sleeve is transparent and clean, it is disconnected at room temperature or above 15℃, and it is connected at -5℃~-8℃. The damage of the defrosting thermostat includes open circuit, adhesion, etc. The failure rate is lower than that of the defrosting heating wire. Open circuit causes excessive frosting of the evaporator: Adhesion causes more defrosting, and even burns out the defrosting overheating insurance. There is water or whiteness in the plastic bag of the defrost thermostat, and 80% is damaged. It is normal to measure the infinite resistance of the two terminals at room temperature. OQ is internal contact adhesion: at a low temperature of 5℃~-8℃ or when the display cases are operated and cooled for about 1 hour, 0Q is normal, and infinity is an open circuit. In addition, the temperature of the defrost thermostat drifts or is fixed, which will cause the defrost to be unclean.
3. Diagnosis and maintenance of defrosting and overheating insurance. Under normal temperature, the resistance value is 0Q, and it is permanently fused at 76°C. There is only one form of damage to the defrosting superheat insurance, which is mostly caused by the adhesion of the defrosting thermostat. The defrosting superheat fuse cuts off the defrosting, and even cuts off the compressor circuit, resulting in no defrosting and some compressors not running. There is no need to remove the display cases defrosting and overheating insurance, just unplug the two connectors of the defrosting and overheating insurance. Measure the resistance between the two plugs, if it is 0Q, it is normal, otherwise it will be damaged. If the defrosting overheating insurance is damaged, it must be replaced with the same specification overheating insurance. It cannot be replaced at will, otherwise it will not provide protection or repeatedly burn the overheating insurance.
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