supermarket refrigerated showcase » article > commercial refrigeration > Supermarket refrigerated showcase Solenoid valve disassembly, diagnosis and maintenance (3)
Supermarket refrigerated showcase Solenoid valve disassembly, diagnosis and maintenance (3)
author: supermarket refrigerated showcase category: commercial refrigeration Views: 491Time: 2016-08-22
, The most common is the breakdown of supermarket refrigerated showcase diodes. Use the multimeter RxlO~Rxlk gear to measure the resistance at both ends. Normally, the forward resistance should be infinite between 300Q and 5kQ due to different measurement gears. If the forward and reverse resistances are both close to zero or very small, it is a diode breakdown: the forward and reverse resistances are both infinite, which is an open circuit: the forward resistance is greater than 10lkQ, and the reverse resistance is infinite, which means the resistance becomes larger.
(4) Capacitor damage There are two types of capacitor damage: breakdown and failure. The most common is breakdown. Capacitor explosion, black spots of breakdown, swelling at the top or bottom of the electrolytic capacitor are all damaged. Use a multimeter RXlk to measure the resistance at both ends to judge whether the capacitor is good or bad. The initial resistance of the electrolytic capacitor is small, and then gradually increases until it is close to infinity: other capacitors are always too large. If the resistance at both ends of the capacitor is close to zero, it is a breakdown, and a larger resistance is leakage, and the electrolytic capacitor is invalid if the resistance does not change. Use digital meter capacitance block to measure no capacity as failure.
(5) Coil damage There are two types of coil damage: open circuit and short circuit. The common one is supermarket refrigerated showcase coil open circuit.
(6) Damage to the refrigeration part The damage of the refrigeration part includes internal jamming and double pass. Remove the solenoid valve, and blow nitrogen into the nozzle of the dry filter first. When it is normal, one nozzle should be used to vent: secondly, connect the two leads of the solenoid valve coil to the 220V power supply, and then blow nitrogen into the nozzle of the filter dryer. The nozzle should vent air. If the test finds that there is no gas or both of the two nozzles, it is judged that the solenoid valve is broken.
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