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Commercial refrigeration disassembly, diagnosis and repair of low temperature compensation devices
author: supermarket refrigerated showcase category: commercial refrigeration Views: 492Time: 2016-08-22
commercial refrigeration disassembly, diagnosis and repair of low temperature compensation devices
low temperature compensation devices include low temperature compensation heating wires, thermostat heating wires, and some are also equipped with low temperature compensation switches or low temperature compensation thermostat.
Low temperature compensation heater removal, diagnosis When the commercial refrigeration ambient temperature is lower than 15℃, turn on the low temperature compensation switch to make the low temperature compensation heating wire work, and heat the refrigerator room or thermostat to ensure the normal use of the commercial refrigeration in the low temperature environment . The low temperature compensation heating wire is open, that is, the resistance between the two terminals is infinite, which will cause the commercial refrigeration environment temperature to be lower than 15 ℃ to not start or the startup time is short and the shutdown time is long, resulting in excessively high freezing room temperature. Low temperature compensation heating wire leakage, that is, the resistance between the terminal and the metal shell of the commercial refrigeration body, will cause the commercial refrigeration body to become charged. If the low-temperature compensation heating wire has multiple bulges, it may leak.
(1) Removal of low-temperature compensation heating wire If the commercial refrigeration ambient temperature is above 15℃, the low-temperature compensation circuit will not work. The current household temperature is generally 15℃, and low-temperature compensation heaters are not suitable for purchase. Therefore, if the low temperature compensation heater is damaged during the maintenance of commercial refrigeration, it is generally dismantled. The removal method depends on the heater's built-in and exposed. Removal method of the built-in low temperature compensation heater: remove the electrical box, if you can see the heating wire, cut the heating wire from the root, and remove the heating wire terminal from the thermostat box to avoid contact with other components in the commercial refrigeration , Become a safety hazard: If you can't see the heating wire, find the low temperature compensation switch, cut one of the leads and wrap it up with insulating tape. Remove the exposed low-temperature compensation heater, cut off the wires at both ends of the low-temperature compensation heating wire, insulate the cut part with tape, and then remove the low-temperature compensation heating wire from the fixing plate.
(2) Diagnosing open circuit and leakage of low temperature compensation heating wire are common damage forms. The open circuit of the low temperature compensation heating wire will cause the low temperature compensation to not work, the commercial refrigeration will not start below 10 ℃, or the start-up time is long, the down time is short and the freezer temperature cannot meet the requirements. Leakage will cause the commercial refrigeration body to become live. If the low-temperature compensation heating wire is bulged in many places, 85% will be damaged. When measuring the resistance at both ends of the heating wire, a certain resistance value is normal, and if it is infinite, it is open. Place the multimeter above the RXlk gear and measureAny terminal of heating wire and commercial refrigeration shell resistance, infinity is normal, a certain resistance value indicates that the heater is leaking.
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