Practice Test Geeks(A2L) A2L Low GWP Flammable Refrigerant Safety Certification Practice Test
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Properties and Classification 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. Which ASHRAE Standard provides the primary classification system for refrigerant safety groups including the A2L category?

    Answer: ASHRAE Standard 34

    ASHRAE Standard 34 'Designation and Safety Classification of Refrigerants' is the governing standard for refrigerant safety classification. It defines the alphanumeric safety group system (A1, A2L, A2, A3, B1, B2L, B2, B3) based on toxicity (A/B) and flammability (1/2L/2/3) ratings.

  2. What refrigerant does R-454B replace, and what is its primary application?

    Answer: R-410A — residential and light commercial split-system air conditioners

    R-454B (Opteon XL41) is designed as the primary replacement for R-410A in new residential and light commercial split-system air conditioning and heat pump equipment. Starting in 2025, most major HVAC manufacturers in North America began shipping R-454B-charged equipment as their primary R-410A replacement product.

  3. What is the chemical name and molecular formula of R-32, a key A2L refrigerant?

    Answer: Difluoromethane (CH₂F₂)

    R-32 is difluoromethane with the molecular formula CH₂F₂. It is an HFC (hydrofluorocarbon) refrigerant with zero ozone depletion potential. R-32 has a molecular weight of 52 g/mol, a normal boiling point of -51.7°C, and a GWP of 675 over a 100-year timeframe.

  4. Under the EPA Section 608 regulations, which technicians are required to recover A2L refrigerants before disposing of or servicing equipment?

    Answer: Any certified EPA Section 608 technician (Type I, II, III, or Universal)

    EPA Section 608 regulations require recovery by any certified technician (Type I, II, III, or Universal) as applicable to the equipment type — the same certification types that apply to other HFC refrigerants. A2L refrigerants are HFCs or HFOs and fall under Section 608. There is no separate A2L-specific EPA certification beyond standard Section 608.

  5. What is the normal boiling point of R-32 and how does it compare to R-410A?

    Answer: -51.7°C for R-32 vs -51.4°C for R-410A — nearly identical boiling points

    R-32 has a normal boiling point of approximately -51.7°C (-61°F), which is nearly identical to R-410A's boiling point of approximately -51.4°C (-60.5°F). This similarity in boiling points contributes to R-32-based blends having similar operating pressures to R-410A systems, easing the transition for equipment designed to R-410A pressure ratings.

  6. R-452B is another A2L refrigerant used as an R-410A replacement. What refrigerants does it contain?

    Answer: R-32, R-125, and R-1234yf in a ternary blend

    R-452B (Opteon XL55) is a ternary blend containing R-32 (67%), R-125 (7%), and R-1234yf (26%) by weight. The inclusion of R-125 (a non-flammable component) compared to R-454B's binary R-32/R-1234yf blend affects its thermodynamic properties and GWP (approximately 676). Both R-452B and R-454B are leading A2L R-410A replacements.