Question

What refrigerant listed is a "low-pressure refrigerant" under EPA's refrigerant recycling regulations?

1) R-22
2) R-123
3) R-134a
4) R-500

Answer 1

R-123, or HCFC-123, is considered a low-pressure refrigerant under EPA regulations, whereas the other refrigerants mentioned, like R-22, R-134a, and R-500, are not in this category.

Step-by-step explanation:

The refrigerant R-123 or hydrochlorofluorocarbon-123 (HCFC-123) is considered a "low-pressure refrigerant" under the EPA's refrigerant recycling regulations. Other refrigerants listed, such as R-22 (hydrochlorofluorocarbon-22), R-134a (hydrofluorocarbon-134a), and R-500, are not categorized as low-pressure refrigerants. It's important to know these classifications for proper maintenance and compliance with environmental regulations. HCFCs have been used as replacements for harmful chlorofluorocarbons (CFCs), such as Freons, which contribute to ozone layer depletion, but they still possess a significant global warming potential and are being phased out under international agreements like the Montreal Protocol.