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Maintenance of commercial refrigeration ten taboos (3)
author: supermarket refrigerated showcase category: walk-in display coolers Views: 529Time: 2016-08-22
maintenance of commercial refrigeration ten taboos
taboos not to remove the flux after brass soldering. Before welding with brass electrodes, stick the electrode head with copper powder or borax to facilitate welding and ensure quality . But after the welding is completed, use a wire pliers to remove the flux, so as to find the leaks that have not been welded when the pressure is checked. [Note] Using brass electrodes, if a welding position is not well welded, there are leaks. If the leaks are blocked by easy-to-melt flux, the pressure will not leak and the repairer will mistakenly believe that the welding is good. . However, because the flux becomes brittle after cooling, it is shaken off during the commercial refrigeration transportation process, and the missing solder at the solder joint is exposed.
Do not use R600a refrigerant machine to weld immediately after deflation. Because R600a refrigerant is very flammable, you should not weld immediately after deflation. You should continue to use flat-nose pliers to open the capillary tube (2cm from the filter), and plug in the commercial refrigeration power supply. 2 Minutes, use the compressor to suck and discharge the residual refrigerant in the refrigeration pipeline, or use nitrogen or air to blow the process port of the compressor to eject the residual refrigerant before welding the refrigeration pipeline.
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