This article focuses on the retrofitting of HFC refrigerants into systems designed for use with HCFC-22. There are now a wide range of HFC retrofit refrigerants for a wide range of R-22 applications from air conditioning through refrigeration.
There are specific skills a service technician needs to have to do such retrofits safely and efficiently. The article that follows illustrates the procedures based on the use of HFC-438A (marketed by DuPont™ as ISCEON® MO99™ and referenced as such in the story) which can be used in place of R-22 in direct expansion residential and commercial air conditioning and medium- and low-temperature refrigeration.