Question

Which refrigerant listed below is a "low pressure refrigerant" under EPA's refrigerant recycling regulations?

1) R-22
2) R-134a
3) R-410A
4) R-123

Answer 1

Among the listed options, R-123 is the "low pressure refrigerant" under EPA's regulations. It is also known as hydrochlorofluorocarbon-123 (HCFC-123) and serves as a less harmful replacement for more toxic substances like carbon tetrachloride.

Step-by-step explanation:

The low pressure refrigerant under the EPA's refrigerant recycling regulations among the options provided is R-123, which is also known as hydrochlorofluorocarbon-123 (HCFC-123). Refrigerants are classified by their pressure levels during operation, and R-123 falls into the low pressure category.

Of the refrigerants listed, R-22, R-134a, and R-410A do not qualify as low pressure refrigerants; they are classified as high or medium pressure refrigerants. R-22 is a hydrochlorofluorocarbon (HCFC-22), R-134a is a hydrofluorocarbon (HFC-134a), and R-410A is a blend of HFC refrigerants. HCFC-123 has been used as a replacement for substances like carbon tetrachloride, which is toxic and carcinogenic.