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Refrigerant Properties and Identification Flashcards

7 cards from real EPA 608 609 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 refrigerant safety classification indicates the lowest toxicity AND non-flammability?

    Answer: A1

    Class A1 refrigerants have lower chronic toxicity (A) and do not propagate flame (1), making them the safest category — examples include R-134a and R-410A.

  2. What does the 'R' stand for in refrigerant designations such as R-22 or R-134a?

    Answer: Refrigerant

    The 'R' simply stands for 'Refrigerant' as standardized in the ASHRAE 34 numbering and naming system for refrigerants.

  3. Compared to R-22, R-410A operates at approximately what pressure level?

    Answer: About 50–70% higher pressure

    R-410A operates at roughly 50–70% higher pressures than R-22 (approximately 1.6–1.7× higher), requiring specialized high-pressure-rated service equipment.

  4. What is the primary chemical difference between HFCs and HCFCs?

    Answer: HCFCs contain chlorine while HFCs do not

    HCFCs (hydrochlorofluorocarbons) contain chlorine atoms that can deplete stratospheric ozone, while HFCs (hydrofluorocarbons) contain only hydrogen, fluorine, and carbon with zero ODP.

  5. What is the approximate 100-year Global Warming Potential (GWP) of R-410A?

    Answer: 2,088

    R-410A has a GWP of approximately 2,088 over a 100-year horizon, making it a potent greenhouse gas despite having zero ozone depletion potential.

  6. Which statement correctly describes a zeotropic refrigerant blend during evaporation at constant pressure?

    Answer: It exhibits temperature glide — the temperature changes while it evaporates

    Zeotropic blends exhibit temperature glide — the temperature changes continuously during evaporation at constant pressure because the components have different boiling points.

  7. When a zeotropic refrigerant blend leaks significantly from a system, what is the correct service procedure?

    Answer: Recover the remaining charge and recharge with a full cylinder of fresh refrigerant

    Fractionation during a leak changes the remaining blend's composition; EPA and manufacturer guidelines require recovering the entire charge and recharging with fresh refrigerant to restore proper composition.