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Display cooler refrigeration failures and maintenance methods (ten)
author: supermarket refrigerated showcase category: walk-in display coolers Views: 711Time: 2016-08-22
display cooler refrigeration failures and maintenance methods (ten)
The cooling of the cooler becomes worse after a few days. The phenomenon: The display cooler is normal, and the cooling becomes worse after 2 to 5 days, and the display cooler is inside The temperature rises, but there is thick frost on the surface of the evaporator, the compressor runs continuously, and the fan runs but no cold wind blows out. Fault analysis: the defrosting circuit does not work, the frost layer fills the evaporator and cannot exchange heat. It involves all components of the defrosting circuit, including the defrosting stabilizer, defrosting heater, defrosting thermostat, and defrosting overheating insurance. Troubleshooting: Plug in the display cooler power supply and turn the defrost timing adjustment shaft clockwise to the defrost position. When you hear the sound of click and , it is the defrost point. Observe the operating current of the display cooler. The display cooler working current is about 0.5A, indicating that the defrosting heater works. Based on this, it is inferred that the defrosting heater, the defrosting thermostat and the overheating insurance in series with it are normal. If the internal gear is stuck, just turn on the defrost timer to clean up the internal dirt. Of course, the defrost timer can also be replaced as a whole, but the same model must be used. The operating current of the display cooler is close to zero, indicating that the defrosting heater is not working. At this time, the resistance of the defrost timer coil should be measured (should be around 8kQ): observe the defrost thermostat, the internal water or corrosive state, and the open circuit status below -5℃ is damaged: measure the resistance of the defrost heater , Infinity is damage (should be 300Q-500Q); when measuring the resistance of the super thermal fuse, infinity is damage.
display cooler cooling difference Except for the two faults described in this section, the other troubleshooting of the electric display cooler is the same as that of the ordinary display cooler.
1. Poor cooling and fan motor does not rotate. Symptom: The condensing fan does not rotate, and the display cooler has poor cooling performance. Failure analysis: The forced cooling fan motor of the condenser is broken, or the starting capacitor is defective. Troubleshooting: The maintenance is carried out in the following four steps:
①Turn the fan to check whether it is stuck.
②Measure whether the fan power supply is supplied.
③Measure whether the resistance of the fan coil is normal.
④Check whether the capacitor is invalid. The multimeter is placed in the RXlk block, and the red and black test leads are used to measure the capacitance of the two pins respectively. When it is normal, the initial resistance value of the measurement is small, and then gradually increases to more than 200kQ. The hands do not move as invalid. The resistance is always small for breakdown.
2. Dual-temperature display cooler The temperature of the refrigerating compartment is too high. Fault phenomenon: The temperature of the refrigerating compartment is too high, and the freezer compartment and opening and stopping times are normal. Failure analysis: The ambient temperature is too high or direct sunlight. Troubleshooting: Avoid direct sunlight, and at the same time pull out the temperature sensing tube about 50 mm, change the sensing temperature to delay the boot time.
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