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Interpreting ASHRAE 34 Refrigerant Safety Classifications Flashcards

6 cards from real A2L practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. According to ASHRAE Standard 34, what does the letter 'A' in a refrigerant classification like A2L signify?

    Answer: Lower toxicity

    The letter in the ASHRAE 34 classification refers to toxicity. 'A' signifies lower toxicity, while 'B' signifies higher toxicity. This is independent of the flammability rating.

  2. What does the '2L' designation in an A2L refrigerant classification specifically indicate?

    Answer: Lower flammability

    The number indicates the level of flammability. '1' is no flame propagation, '2' is flammable, and '3' is highly flammable. The 'L' subclass for '2' was created to denote lower flammability characteristics, such as high minimum ignition energy and low burning velocity.

  3. How does an A3 refrigerant, like R-290 (Propane), differ from an A2L refrigerant, like R-32?

    Answer: A3 has higher flammability than A2L.

    The primary difference is the degree of flammability. A3 refrigerants have a higher flammability, lower minimum ignition energy, and higher burning velocity compared to A2L refrigerants. Both are considered 'A' for lower toxicity.

  4. A refrigerant is classified as B1. What does this combination of letter and number indicate?

    Answer: Higher toxicity, no flame propagation

    The 'B' indicates higher toxicity, meaning it has an Occupational Exposure Limit (OEL) of less than 400 ppm. The '1' indicates no flame propagation under test conditions. Therefore, a B1 refrigerant is of higher toxicity but is not flammable.

  5. Which of the following is a primary driver for the industry's transition to A2L refrigerants?

    Answer: They have a significantly lower Global Warming Potential (GWP).

    A2L refrigerants have been developed as alternatives to high-GWP hydrofluorocarbons (HFCs) like R-410A. Their main benefit is a significantly lower Global Warming Potential (GWP), which helps meet environmental regulations aimed at phasing down HFCs.

  6. Which of the following refrigerants is classified as A2L?

    Answer: R-32

    R-32 is a common single-component refrigerant classified as A2L. R-410A and R-134a are A1 (non-flammable, lower toxicity), and R-717 (Ammonia) is B2L (higher toxicity, lower flammability).