supermarket refrigerated showcase » article > walk-in display coolers > Walk-in cooler does not stop or abnormally starts and stops (2)
Walk-in cooler does not stop or abnormally starts and stops (2)
author: supermarket refrigerated showcase category: walk-in display coolers Views: 554Time: 2016-08-22
walk-in cooler does not stop or abnormally starts and stops (2)
The refrigerated evaporator has thick ice (thickness) and does not stop. Trouble phenomenon: excessive refrigeration, evaporation of the refrigerator compartment The surface of the device is thick with ice (frost) and does not stop. Fault analysis: The temperature in the walk-in cooler has reached the shutdown requirement, but the temperature controller does not shut down due to the constant on. Troubleshooting: Replace the thermostat of the same model, or install a time controller outside the walk-in cooler.
freezes well, cold storage also frosts, non-stop failure phenomenon: freezing and refrigeration is good, the back of the refrigerator is also frosted, the condenser heating area is above 2/3, but it does not stop. Fault analysis: The walk-in cooler is normal, but the temperature sensor is not correct or it is always on. Troubleshooting: Replace the thermostat or use a time controller.
is turned on for a certain period of time to protect
frequently on and off with clicks and sounds. Failure phenomenon: The compressor runs for 3 minutes to minutes, and stops for 1 minute to 2 minutes, and there are clicks and sounds at the moment of startup and shutdown. Fault analysis: It is the frequent action of the overload protector. Generally, the household voltage does not meet the requirements, or the compressor and accessories are damaged; for the models using the PTC starter, the PTC starter is likely to be damaged. Troubleshooting: Under the condition of normal household electricity consumption, unplug the walk-in cooler power supply, open the compressor accessory box, and check and replace the starter and overload protector in order to find out the faulty components.
①Check the starter resistance, the normal value of PTC type is about 22Q, the sound of hand shaking, the sound of hand shaking, the excessively large or small resistance value are all damaged: the weight type positive and negative resistance should be switched on and off, and the measurement should be repeated 3 to 5 times. If there is an abnormality, the damage should be judged.
②Check the resistance of the overload protector, the normal value is 1Q~5Q, there is a sound of debris when shaking with your hand, and the resistance value is too large or too small to be damaged.
③Measure the resistance of the starter and the overload protector. If there is no obvious abnormality, try to replace the secondary overload protector and the starter. If the fault still cannot be eliminated, judge that the compressor has a problem.
refrigerated showcase walk-in cooler takes about 0.5 hours to protect. Fault phenomenon: frosting is normal, but cooling for about 0.5 hours, the compressor stops and forwards click protection sound. Failure analysis: the household electricity does not meet the requirements, the compressor and accessories have problems, and the condenser heat dissipation is not good. Troubleshooting: Follow the two steps below.
①Under the condition that the household electricity consumption meets the requirements, unplug the power supply, open the compressor accessory box, and check and replace the starter and overload protector in turn. The maintenance method is upward. For a larger walk-in cooler, if you use a PTC starter, you should pay attention to the starter’s marked resistance, and some are 33Q instead of the 22Q used by the walk-in cooler.
② Observe the condenser and fan. The condenser fan does not work, ' the fan motor should be replaced: if it runs normally, but the condenser is too dirty, it should be cleaned. [Note] Some walk-in coolers have no condenser fan.
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