ICC Commercial Mechanical Practice Exam

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What refrigerant classification does R-290 Refrigerant have?

The correct answer is: A3

R-290, commonly known as propane, is classified as an A3 refrigerant. This classification indicates that refrigerants in this category have a high flammability potential. The classification system is set by ASHRAE (the American Society of Heating, Refrigerating, and Air-Conditioning Engineers) and categorizes refrigerants based on their toxicity and flammability. A1 refrigerants are those that are non-flammable and have low toxicity, while A2 refrigerants have moderate flammability and lower toxicity. Since R-290 exhibits high flammability, it does not fit into the A1 or A2 categories. B3 refrigerants are those that are highly toxic and can also be flammable, but R-290's toxicity is comparatively low, thus it does not belong in this classification either. Therefore, identifying R-290 as an A3 refrigerant is correct as it accurately reflects its properties in terms of flammability.