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Commercial refrigeration defrosting device disassembly, diagnosis and maintenance (3)
author: supermarket refrigerated showcase category: commercial refrigeration Views: 511Time: 2016-08-22
commercial refrigeration defrosting device disassembly, diagnosis and maintenance (3)
commercial refrigeration defrost timer repair is the internal structure and disassembly of the defrost timer. Unscrew the fixing screws of the defrost timer shell, remove the shell, take out the rotor and coil in turn, then remove the fixing screws of the middle shell, remove the middle shell, and expose the contacts. There are burrs between the rotor and stator of the defrost timer. Use a small brush to remove them. If the contact is not in good contact, use fine sandpaper to polish off the oxide on the contact, and the internal coil and gear are damaged. Replace it with the same type of defrost timer coil and gear.
Precautions for replacing the defrost timer. The defrost timer must be replaced with the same model, otherwise the original fault will not be eliminated, on the contrary, the fault will be enlarged.
(1) Defrost timer model identification, defrost timer has type 1 and type 11. Both the appearance and the number of terminals are exactly the same, but due to the different internal structure, the defined terminal functions are different. One end of the commercial refrigeration defrost timer motor coil is connected to its own transfer switch contact 1 end, and the other end is an independent terminal. One end of the type II defrost timer motor coil is connected to the 3 end of its own transfer switch contact, and the other end is an independent terminal. According to the above characteristics, the defrost timer model can be distinguished by measuring the motor winding, and the defrost timer with the same motor winding terminal position can also be used.
(2) Type I and Type II defrost timing interchange measures. The difference between Type I and Type II defrost timers is mainly due to the different terminal functions, and the difference in terminal functions is due to the Z-shaped spring connecting the motor and the terminal The slice shape is different. Therefore, when the type of defrost timer is different, you can replace the Z-shaped reed of the old defrost timer with a new one: you can also remove the Z-shaped reed and connect the two contacts directly with a wire , But connect firmly.
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