Which refrigerant is historically associated with older central air systems and is a CFC?

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Study for the NOCTI Heating, Ventilation, and Air Conditioning (HVAC) Test. Practice with flashcards and multiple choice questions, each question offers hints and explanations. Get ready for your exam!

Multiple Choice

Which refrigerant is historically associated with older central air systems and is a CFC?

Explanation:
Older central air systems used refrigerants that contained chlorine, which is a hallmark of chlorofluorocarbons that deplete the ozone layer. R-12 is the classic CFC that was widely used in those older systems. Because of environmental concerns, R-12 was phased out and replaced with refrigerants that do not contain chlorine, such as R-134a. The other refrigerants listed belong to different classes: R-134a is an HFC without chlorine, R-22 is an HCFC with chlorine but not a CFC and is being phased out as well, and R-410A is an HFC blend used in newer equipment.

Older central air systems used refrigerants that contained chlorine, which is a hallmark of chlorofluorocarbons that deplete the ozone layer. R-12 is the classic CFC that was widely used in those older systems. Because of environmental concerns, R-12 was phased out and replaced with refrigerants that do not contain chlorine, such as R-134a. The other refrigerants listed belong to different classes: R-134a is an HFC without chlorine, R-22 is an HCFC with chlorine but not a CFC and is being phased out as well, and R-410A is an HFC blend used in newer equipment.

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