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Disassembly, diagnosis and repair of starter and protector in supermarket refrigerated showcase
Disassembly, diagnosis and repair of starter and protector in supermarket refrigerated showcase
The starter and protector are connected to the compressor terminal and are located in the compressor accessory box of supermarket refrigerated showcase . Before disassembling, pry open the accessory box fixing clip, remove the accessory box before disassembling, and unplug the refrigerator before disassembling.
Starter disassembly, diagnosis and maintenance. At the moment the compressor starts, the starter should connect to the compressor start winding circuit to make the compressor rotate after power. After the compressor starts to run, the starter is automatically disconnected, cutting off the compressor starting winding circuit.
(1) Starter disassembly and assembly method, unplug the refrigerator power supply, pry open the compressor accessory box, note the installation position of the starter on the compressor, unplug or pry out the starter. When installing, the two holes of the starter should be aligned with the compressor start terminal S and the running terminal M, and press inward evenly to prevent damage to the starter or compressor terminal.
[Note] Since the two jacks are not inserted in the middle position, plus the position of the compressor accessory box baffle, the starter can basically only be inserted in one direction, so there is generally no need to worry about inserting it wrong. In case of special models, if you cannot remember which compressor start terminal is during installation, check first. Whether the position of the three terminals is marked on the nameplate of the compressor, secondly, use a multimeter to measure the resistance between the three terminals of the compressor. The method first finds out the middle line of the supermarket refrigerated showcase, and then measures the resistance between the middle line and the other two terminals. The larger resistance is the start terminal. The smaller resistance is the running terminal. The top end of most compressors is the common terminal C, the lower part near the nozzle is the running terminal M, and the other is the starting terminal S.
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