Which refrigerant is not classified as an HFC?

R-22 is not classified as an HFC (hydrofluorocarbon) refrigerant. Instead, R-22 is a hydrochlorofluorocarbon (HCFC). This classification is important because HCFCs are known to have ozone depletion potential, while HFCs do not deplete the ozone layer. The phase-out of HCFCs like R-22 is part of global efforts to reduce substances harmful to the ozone, as outlined in treaties like the Montreal Protocol.

On the other hand, the other refrigerants listed—R-125, R-152A, and R-134A—are all HFCs. HFCs were developed as replacements for HCFCs and CFCs due to their lower ozone depletion potential. Understanding these classifications helps technicians choose appropriate refrigerants and comply with regulations regarding the use, recovery, and disposal of refrigerants.