Environmental Protection Agency (EPA) MVAC Certification

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Get ready for the EPA MVAC Certification exam with our study materials covering flashcards and multiple choice questions, each offering hints and explanations. Prepare thoroughly for your certification!

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Which refrigerant replaced R-12 in automotive air conditioning systems?

R-134a
R-22
R-410A
R-152A

The correct answer is: R-134a

R-134a is recognized as the refrigerant that replaced R-12 in automotive air conditioning systems due to its lower ozone depletion potential. The transition from R-12, a chlorofluorocarbon (CFC), was necessitated by environmental regulations aimed at protecting the ozone layer. R-134a is classified as a hydrofluorocarbon (HFC) and does not contain chlorine, which significantly reduces its impact on ozone depletion. Moreover, the adoption of R-134a corresponds with broader efforts to make air conditioning systems more environmentally friendly while still maintaining effective cooling performance. R-134a has different pressure and temperature characteristics compared to R-12, which required adjustments in system design and service practices. Thus, R-134a is the direct successor to R-12 in automotive applications.