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display cooler solenoid valve disassembly, diagnosis and maintenance (2)
author: supermarket refrigerated showcase category: commercial refrigeration Views: 492Time: 2016-08-22
display cooler solenoid valve disassembly, diagnosis and maintenance (2)
solenoid valve diagnosis and maintenance failure rate is extremely low, two-way solenoid valve does not change direction, generally not its own cause, The refrigeration thermostat that controls whether the display cooler is energized or not has problems.
Monostable Solenoid Valve Diagnosis
(1) Normally, when the solenoid valve is energized, the spool should be able to hear the crisp impact sound of the valve core suction and release, and at the same time the solenoid valve intake pipe and the two outlet pipes are connected , Break conversion. After the electrical part of the solenoid valve is damaged, the valve core cannot be sucked in, so that after the refrigerator compartment reaches the set temperature, it cannot be converted into the freezer compartment for independent cooling.
(2) The common damage form is varistor breakdown and fuse fusing is more common; secondly, rectifier diode breakdown and coil open circuit. Measure the resistance of the AC 220V input terminal of the solenoid valve, and it should be about 2.3kQ under normal conditions.
common troubleshooting
(1) After the varistor is broken down, the surface will have cracks, bursts, black coke spots, and charred, but the measured resistance is generally infinite (the normal value is also infinite), so check This piece cannot use the resistance method. The breakdown of the varistor is mostly caused by the
display cooler's high working voltage. If the varistor cannot be purchased, it can be removed and used, but the over-voltage protection function for households will disappear.
(2) The fuse is blown and the blow is manifested by the interruption of the inner wire of the display cooler or the blackening of the glass tube. The resistance at both ends of the measurement is infinite (normal 091). The fusing of the fuse, especially the internal blackening, is caused by the breakdown of the varistor, diode, and capacitor in the solenoid valve. Very rarely, it is caused by the high power consumption of the household or the problem of the insurance itself, but generally it is only the fusing of the metal wire. Blackened. After the fuse is blown, replace the fuse of the same specification. If it is too large, it will not be able to protect it. If it is too small, it will easily blow and protect it by mistake.
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