All domestic refrigerators, commercial, industrial, etc. After the leak test requires, for proper operation, a perfect cleaning and dehydration of the entire system. Impurities clog the control valves and valve seats of the compressors. The humidity, in the presence of the refrigerant, forms halogenous compounds that attack the internal parts of the compressor, causing corrosion. The halogen compounds also cause dissociation of the lubricating oil, generating the formation of sediments which produce excessive wear on the moving parts. In semi-hermetic and hermetic compressors, they also attack the insulation varnish the motor stator, causing a short circuit and burn, in addition to the galvanic process of copper in the moving parts. Humidity also causes frostbite, which clogs the holes and seats of the expansion valve.
Dehydration and vacuum are important services to be performed in a refrigeration plant.
