walk-in cooler intercooler refrigeration error failure and analysis

walk-in cooler intercooler secondary failure machine refrigeration error phenomenon: poor refrigeration, no shutdown, after the freezer compartment There is a layer of frost on the grid and the fan runs normally.

Failure analysis: For indirect cooling walk-in cooler, although the refrigeration system and defrosting system have problems, the cooling difference will be caused, but the former is the real cooling difference, which reflects that the freezing evaporator has less frosting and the condenser heating area Small; the latter is that the system refrigeration is normal but the cooling is poor, the main manifestation is that the evaporator is thick or even icy, and the heating area of ​​the condenser is above 2/3, but because it cannot defrost, the thick frost blocks the air duct and affects the cooling . Troubleshooting: Open the air duct grille at the back of the freezer compartment and check the frost on the surface of the freezer evaporator and the heating area of ​​the condenser.

①The freezer compartment evaporator has less frost and the condenser has a small heating area. The method of checking the refrigeration system is the same as the ordinary walk-in cooler.

②The freezer compartment evaporator is full of thick ice, the area of ​​the condenser above 2/3 generates heat, and the heat changes uniformly. Carry out a dangerous check on the defrosting circuit. Rotate the defrost timer adjustment knob to the defrost position (a sound of   clicks  ), and observe the frost layer of the evaporator. If the frost layer is slowly removed, after the frost layer is removed, observe whether the fixed position of the defrost thermostat is correct. It should be fixed in the accumulator; whether the drainage hole of the defrost baffle is aligned with the drainage channel; finally consider the defrost timing The device is damaged or the model is correct. If there is no change in the frost layer, it is necessary to judge that there is a problem with the defrost circuit. First observe whether the position of the defrosting thermostat is correct, check the defrosting heater (normally 300Q~500Q), defrosting thermostat (there is water or corrosion in the inside for damage), the defrosting overheating insurance, and finally the defrosting Timer.

walk-in cooler intercooler has poor refrigeration and repeated overheating insurance failure phenomena: poor refrigeration, no shutdown, frost on the rear grid of the freezer, fan running normally, but repeated burns, defrosting and superheat insurance.

failure analysis: repeated overheating defrosting insurance, may be replaced by a small size of the insurance, or defrosting is not only the evaporator temperature is too high and the overheating fuse is blown, there is another possibility that the overheating fuse is installed at the wrong location. Troubleshooting: Open the rear air duct grille of the freezer compartment, observe the defrosting overheating insurance, observe the position of the defrosting insurance, and measure the resistance of the defrosting thermostat to determine the inspection range. The superheat fuse is not installed in the original position. Replace the superheat fuse and install it to the original position, usually under the side tube of the evaporator. Check the defrosting thermostat, normal temperature Bian is connected (resistance value is 0), if it is damaged, you should replace the defrosting thermostat of the same model. Whether the defrost heater is installed in the correct position, it should be fixed on the fixed bracket at the lower end of the evaporator: then, it is necessary to consider whether the replaced superheat insurance specification does not meet the requirements.

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