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Maintenance of supermarket refrigerated showcase Ten taboos
Repair supermarket refrigerated showcase Ten taboos
Beginners develop good habits to quickly find and repair the failure of the supermarket refrigerated showcase, and restore the original performance of the supermarket refrigerated showcase. If the original noise is 49dB, the ratio of on-off time is 0.8:1. After the repair, the noise becomes louder, the ratio of on-off time is 1.5:1, the temperature of the refrigerating room is high and the evaporator is not full of frosting, it belongs to the deterioration of the performance of the supermarket refrigerated showcase after repair.
Avoid blindly venting. For repairing supermarket refrigerated showcase, blindly venting the supermarket refrigerated showcase without knowing about the test machine is not conducive to failure judgment, it may increase the amount of maintenance, and even cause new failures and hidden dangers. Example 1: A supermarket refrigerated showcase is sent for repair, and users report that the refrigeration is poor. Based on this, it is preliminarily believed that the refrigeration system is leaking or the compressor discharge performance is poor. Plug in the power and test the machine for about 30 minutes. Observe the pipeline near the compressor and find that the capillary tube at the outlet end of the filter is frosted. According to maintenance experience, this is a unique manifestation of micro-blocking in the frosted area, thus negating the original diagnosis. If the air is vented without testing the machine, the nozzles of the compressor will be welded to check the exhaust performance. The result of the inspection must be that the exhaust performance is good, and the refrigeration pipeline of the supermarket refrigerated showcase will continue to be suppressed and leaked. If the leakage is checked in stages, the capillary will be opened, and the micro-blocking troubleshooting will be carried out when reinstalling correctly: When conducting a total pressure check, it cannot be eliminated because the capillary signal is not involved. The repairer is not only at a loss for this repair, but for those with poor welding skills, new hidden dangers will be left due to welding problems.
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