What happens if R-12 is mixed in an R-22 circuit?

In this case, if R-12 is mixed in an R-22 circuit, there is the possibility of forming an azeotropic mixture (25% R-12 and 75% R-22) which will present higher pressure than the original system with R-22. Mixing of refrigerant fluids in a system is not recommended. This recommendation is made by refrigerant manufacturers for safety reasons (in some cases, the formation of a flammable mixture of refrigerant) and by the manufacturer of compressors, which guarantee the performance of the equipment only if the refrigerant originally specified . There are mixtures of commercially available refrigerants (R-502, R-404 A, etc.), but these are produced directly by refrigerant manufacturers in accordance with controlled specifications for use in compressors tested and approved for this application. To receive the pressure table and temperature of the alternative refrigerants contact Elf Atochem Brasil.