supermarket refrigerated showcase » article > commercial refrigeration > Maintenance of display cooler ten taboos (2)
Maintenance of display cooler ten taboos (2)
author: supermarket refrigerated showcase category: commercial refrigeration Views: 529Time: 2016-08-22
maintenance of display cooler ten taboos
taboo blind replacement repair work found that there are quite a few beginners, before the display cooler failure has been determined, they just try to change the mentality. Anyway, the display cooler has only a dozen devices in total, especially if there is a non-stop failure. Little do you know that each of these ten or so devices has its own unique performance, and through these unique performances, you can know it well. Example 2: A certain display cooler does not stop for refrigeration, and the test machine is 40 minutes to 60 minutes. The freezing and refrigeration are very good, and the preliminary judgment is that the cooling is basically normal. After unplugging the display cooler, shutting down and opening the refrigerator door for 2 to 3 hours, press the back of the refrigerator and feel that the inside of the refrigerator is soft, which is the display cooler. The internal bladder is detached (a unique performance), which causes the thermostat fixed on the surface to sense the temperature The head cannot correctly sense the temperature of the evaporator, and cannot stop the machine before reaching the stop temperature. Troubleshooting after repairing the valve chamber b [Note] For this failure, ordinary beginners judge that the thermometer is broken and replace it, but only 30% of the models are troubleshooting (because the temperature sensor head of the thermostat is wound more, It is fixed better than the original place to improve the temperature sensitivity), and 70% of the display cooler still does not stop, so I suspect that the cooling is poor, check whether the condenser is dirty, and check the compressor exhaust performance. The refrigeration pipeline was suppressed and leaked, but the result was nothing.
Avoid finding that the value of the pressure gauge drops and blindly judge the leakage of the refrigeration pipeline after suppressing the refrigeration pipeline. The first task is to apply detergent to the new welding part and the pressure gauge connection port to check whether it is leaking. Secondly, determine the initial count value of the observation pressure gauge according to the ambient temperature (maintenance season). The pressure gauge value can be directly observed after pressure in spring, summer and autumn as the pressure value: in winter, it needs to be pressured for 2 hours to 3 hours, that is, after the gas injected into the refrigeration pipeline is at the same ambient temperature, observe the pressure gauge value, and As the suppression value. When welding the pressure gauge due to pressure, the welding residual heat may make the gas temperature in the refrigeration pipeline high, which will cause the pressure in the refrigeration pipeline of the display cooler to be relatively high (thermal expansion and contraction), and the pressure gauge value indication value is higher.
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