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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.

Read the first 7 Refrigerant Recovery, Recycling, and Handling flashcards as text

  1. A vehicle A/C system is low on charge with no visible signs of a leak. The BEST next step is to:

    Answer: Inject UV dye and perform a thorough leak search

    UV dye injection followed by a UV light inspection is an effective method for finding slow or small leaks that are not visible to the naked eye or detectable when the system is empty.

  2. What symptom indicates an OVERCHARGED A/C system?

    Answer: High-side pressure is excessively high with poor cooling output

    An overcharged system has excessive refrigerant that cannot fully condense, causing abnormally high discharge pressure and reduced cooling efficiency.

  3. Which SAE standard defines service fittings that prevent cross-contamination between R-134a and R-1234yf systems?

    Answer: SAE J2843

    SAE J2843 specifies unique quick-connect service fittings for R-1234yf systems to prevent accidental charging with R-134a or cross-contamination between the two refrigerant types.

  4. During recovery, refrigerant should be recovered from:

    Answer: Both the high side and low side simultaneously using the appropriate connections

    Connecting to both high- and low-side service ports speeds recovery and ensures complete removal of refrigerant from both sides of the system.

  5. What is the FIRST action a technician should take when an A/C system pressure remains elevated after recovery appears complete?

    Answer: Allow the system to cool and attempt a second recovery cycle

    Residual pressure after recovery often means refrigerant is still boiling off; allowing the system to cool and running a second recovery cycle removes additional refrigerant that was in liquid form.

  6. When charging a refrigerant system by weight, which component of the service equipment provides the most accurate charge measurement?

    Answer: The calibrated electronic scale integrated with recovery/recharge equipment

    An electronic scale measures refrigerant by mass (weight), providing the most accurate charge compared to pressure-based methods that vary with temperature and system condition.

  7. R-1234yf refrigerant is classified as mildly flammable under ASHRAE Standard 34 as safety group:

    Answer: A2L

    R-1234yf is rated A2L — 'A' indicates low toxicity and '2L' indicates mildly flammable with a low burning velocity, requiring specific handling precautions not needed with A1 refrigerants like R-134a.