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Refrigerant Recovery, Recycling, and Handling Flashcards

7 cards from real ASE 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 refrigerant has largely replaced R-134a in newer vehicle A/C systems due to its lower global warming potential?

    Answer: R-1234yf

    R-1234yf (HFO-1234yf) replaced R-134a in many newer vehicles because it has a GWP of less than 1 compared to R-134a's GWP of 1,430.

  2. What federal regulation requires technicians to be certified before purchasing or handling refrigerants used in motor vehicle air conditioning?

    Answer: EPA Section 609

    EPA Section 609 of the Clean Air Act specifically covers technician certification and equipment standards for servicing motor vehicle air conditioning systems.

  3. Before opening a vehicle A/C system for service, the technician MUST first:

    Answer: Recover all refrigerant using approved equipment

    EPA regulations prohibit venting refrigerants into the atmosphere; all refrigerant must be recovered with approved equipment before opening the system.

  4. A refrigerant identifier displays contamination in a sample recovered from a vehicle. The technician should:

    Answer: Store it in a dedicated contaminated refrigerant cylinder and send it to a reclaimer

    Contaminated refrigerant must be stored separately in a dedicated cylinder labeled for contaminated refrigerant and sent to a certified reclaimer; venting is never permitted.

  5. What color is used to identify the HIGH-SIDE hose on a standard A/C manifold gauge set?

    Answer: Red

    The high-side hose is red, the low-side hose is blue, and the center utility hose is yellow — this is the standard industry color coding.

  6. What is the purpose of evacuating an A/C system with a vacuum pump before recharging?

    Answer: To remove moisture and non-condensable gases

    Evacuation removes moisture and air (non-condensable gases) from the system; moisture combines with refrigerant to form acids that damage A/C components.

  7. Which type of oil is required for use in R-1234yf A/C systems?

    Answer: PAG (Polyalkylene Glycol) oil

    R-1234yf systems require PAG oil, the same type used with R-134a, though the specific viscosity grade must match the manufacturer's specification.