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display cases Fan motor disassembly, diagnosis and maintenance
display cases Fan motor disassembly, diagnosis and maintenance
General display cases No fan. However, indirect cooling type display cases require a fan in the freezer to dissipate the cooling. Some display cases are equipped with condenser cooling fans at the bottom of the display cases.
1. Freezer fan motor disassembly, diagnosis and maintenance
(l) fan motor disassembly, unplug the display cases, remove the power plug and remove the freezer air duct grille to expose the fan motor and other components, remove the fan fixing screw, and unplug Take out the fan plug-in cord, the motor and the fixing bracket, pry down the fan blades, the fan fixing bracket, and take out the fan motor. Installation is the reverse process of disassembly.
(2) The fan motor diagnoses the motor shaft wrinkle, the coil open circuit or the overheat fuse open circuit, which is a common form of damage to the fan motor. There are cracks in the sealing plastic of the fan motor stator, which generally indicates that the internal coil is blown: measure the resistance between the two wires of the motor, about 5000 is normal, and infinity means the internal coil is open. The inflexibility of the rotating shaft is caused by wrinkles in the display cases. Damage to the fan motor of the indirect cooler will result in poor cooling effect: damage to the fan motor of the indirect cooler may not only cause poor cooling effect, but also cause compressor protection.
(3) Fan motor repair Fan motor thermal fuse specifications: generally 250V, 10A, fusing temperature 1420C fuse. Metal wire cannot be used for maintenance. Repair method for fan shaft wrinkle: Put some refrigerating oil into the copper sleeve of the motor shaft, and rotate the shaft repeatedly. If the shaft can rotate flexibly, it roughly indicates that the shaft wrinkle has disappeared. Generally, it can be used continuously.
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