supermarket refrigerated showcase » article > walk-in display coolers > Supermarket refrigerated showcase compressor disassembly, diagnosis and repair (2)
Supermarket refrigerated showcase compressor disassembly, diagnosis and repair (2)
author: supermarket refrigerated showcase category: walk-in display coolers Views: 539Time: 2016-08-22
supermarket refrigerated showcase compressor disassembly, diagnosis and repair (2)
compressor fault diagnosis and repair
compressor is a high-priced component in supermarket refrigerated showcase The new compressor is 150-500 yuan, and the old compressor is about 50 yuan if it is disassembled). Although it can be repaired and some experience is good, because there are no compressor accessories on the market, opening the shell is time-consuming and requires electric welding. The malfunction of the stuck cylinder and other parts will reappear after a period of use after being repaired, so make up for the leakage of the compressor. Except for welding, other faults are generally not repaired, but the compressor of the same model is replaced.
1. Compressor nozzle and terminal identification
(1) Nozzle identification The compressor has three nozzles, of which there are two low-pressure nozzles (one suction or return nozzle, one positive art nozzle), Two high-pressure nozzles. The thinner nozzle is the high pressure nozzle (connected to the anti-dew tube or condenser), the thicker nozzle is the low pressure nozzle, the evaporator is connected to the return nozzle, and the separate seal is the process tube. Generally speaking, one nozzle on one side is mostly a low pressure nozzle, and two nozzles on one side are a high pressure nozzle and a low pressure nozzle.
(2) The three-terminal recognition compressor models are different, and the positions of the three-terminals are different. The position of the three terminals is marked on the compressor nameplate. Compression terminals are common terminal, running terminal, and starting terminal. The positions of the three compressor terminals vary by model, but the top of most compressors is a common terminal, which is connected to an overload protector: the terminal near the nozzle of the supermarket refrigerated showcase is the operating terminal: the other is the start terminal, and the two starters are plugged in. Jack. On this basis, use a multimeter to further distinguish and determine.
2. Compressor fault diagnosis. When the compressor is normal, there is a uniform running sound, a slight vibration feeling when touching the shell by hand, a certain temperature (some feel hot), and the running current should not be higher than the rated value (usually 0.8A~ 1.4A), there should be no abnormal sound. The discharge and suction performance of the high and low pressure nozzles is good. The performance is that the nozzle of the high pressure (exhaust) pipe can not be blocked with the thumb. Pressing the low pressure (inhalation) nozzle should have a large suction.
(1) Compressor winding diagnosis normal value of ordinary compressor winding: the resistance of the running winding is 5Q-22.3.Q (generally 8Q-10Q), and the resistance of the starting winding is 20Q~51Q (generally 20Q-26Q) , The resistance between the running terminal and the starting terminal = running winding resistance + starting winding resistance.
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