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Repair of mixed working fluid and fluorine-free walk-in cooler
author: supermarket refrigerated showcase category: commercial refrigeration Views: 523Time: 2016-08-22
Repair of mixed working fluid and fluorine-free walk-in cooler
Repair of fluorine-free walk-in cooler is basically the same as that of fluorine-free walk-in cooler, but because of fluorine-free refrigeration The characteristics of the agent, there are some differences in the operating process.
1. Repair of mixed refrigerant walk-in cooler Since the characteristics of mixed refrigerant have similar characteristics compared with R12 refrigerant, the repair process is the same as that of R12 refrigerant walk-in cooler. R134a fluorine-free walk-in cooler repair fault diagnosis and basic operation are basically the same as fluorine walk-in cooler, but because the compressor for R134a refrigerant uses vinegar lubricant, it is characterized by strong water absorption and reacts with water to generate acid , Corrosive to the pipeline. If it meets with mineral oil and moisture used in compressors for R12 or R600a refrigerants, vinegar oil will be decomposed, reducing lubricity. In addition, vinegar oils can cause skin inflammation, so avoid contact with skin and eyes during operation. Therefore, the following points should be paid attention to when repairing RI34a fluorine-free walk-in cooler.
(1) Tools must be dedicated. All tools in contact with refrigerant must be dedicated. Refrigerant cylinders, liquid filling belts, pressure gauges and R12 system related tools cannot be used for the maintenance of R134a system. If you must use it, you need to clean it, but you can't use the R12 compressor to suppress the system and check for leaks.
(2) The material to be dedicated compressor and filter drier must be of the same model, usually HX-7 or HX-9. Other devices in contact with refrigerant should also be dedicated. The copper tubes and system-related components used in the R12 system cannot be used in the R134a system. If used, it can be used after washing with trichloroethylene. When welding refrigeration pipes, it is best to use dry flux. If there is no dry flux, copper electrode or trace electrode can also be used.
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