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Supermarket refrigerated showcase non-stop or abnormal opening and shutdown
author: supermarket refrigerated showcase category: walk-in display coolers Views: 722Time: 2016-08-22
supermarket refrigerated showcase non-stop or abnormal opening and shutdown
repair first to distinguish whether the supermarket refrigerated showcase can meet the requirements for refrigeration, and for refrigeration that does not meet the requirements, check by refrigeration difference: For those that meet the requirements, First observe whether the refrigerating chamber is separated, whether the ambient temperature of the supermarket refrigerated showcase is too high, whether the condenser heat dissipation is good, whether the thermostat is placed in the highest gear, and then check the thermostat and other devices.
non-stop for poor cooling
supermarket refrigerated showcase Non-stop for poor cooling, poor cooling is the cause, and non-stop is the consequence. Therefore, the maintenance should be carried out according to the refrigeration difference, which can be regarded as a primary failure or a secondary failure, combined with the test machine situation, observe the exposed refrigeration pipeline and the side of the freezer compartment of the middle door frame.
does not stop if the refrigeration is good
supermarket refrigerated showcase does not stop if the refrigeration is good, which means that the temperature of the supermarket refrigerated showcase does not stop when the temperature reaches the specified value within the specified time. One of the reasons for the failure of the machine was the damage of the thermostat and the detachment of the inner bladder of the supermarket refrigerated showcase (diameter >100mm). For the secondary failure machine, it is necessary to consider whether the temperature sensor of the thermostat is fixed in place, whether there is any error in the wiring of the thermostat, and whether the refrigerant is overfilled, etc.
1. Non-stop, large icy lumps formed locally in the refrigerating room. Trouble phenomenon: If the refrigeration is good, large icy lumps formed on the back of the refrigerator. Failure analysis: supermarket refrigerated showcase typical performance of the internal bladder detachment, because the inner bladder is an evaporator, and a thermostat is fixed on the surface of the bladder. If the inner bladder is detached, the conductivity between the evaporator and the temperature sensor will be poor, that is, the temperature The temperature sensor of the controller cannot correctly sense the temperature of the evaporator, resulting in non-stop operation. At the same time, the inner tank is constantly frozen by the dew condensed by the temperature change in the supermarket refrigerated showcase, forming ice lump over time. Troubleshooting: After soliciting user opinions, use any of the following methods.
① Routine maintenance methods. Stop the machine, open the doors of the freezer and refrigerator compartments, and after the ice has naturally melted, pierce a dozen small eyes on the icy bumps on the back of the refrigerator compartment, press the inner tank to drain the accumulated water inside; Then use a hair dryer to bake the inner bladder of the supermarket refrigerated showcase while pressing it with your hand to restore the inner bladder to its original position. The inner tank of the supermarket refrigerated showcase should not be heated too high, and the hand can be touched as the standard, so as to avoid overheating and deformation of the ABC board, which cannot be explained to the user.
②Alternative maintenance method. Install a time controller outside the supermarket refrigerated showcase, directly according to the supermarket refrigerated showcase power supply, power-off time, to achieve the temperature control of the supermarket refrigerated showcase. The advantage is that it is simple and easy to operate and the price is tens of yuan; the disadvantage is that the lights on the inner door of the supermarket refrigerated showcase do not light up when it is down, and it is inconvenient to access the items.
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