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Refrigerant Recovery and Handling Flashcards

7 cards from real HVAC 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 and Handling flashcards as text

  1. What is the maximum allowable leak rate for refrigerant systems with a charge over 50 lbs in comfort cooling applications under EPA Section 608?

    Answer: 15% per year

    EPA Section 608 sets the leak rate trigger at 15% of the total charge per year for comfort cooling equipment with charges over 50 lbs.

  2. Which refrigerant blend requires special 'push-pull' recovery techniques due to its zeotropic behavior causing fractionation?

    Answer: R-404A

    R-404A is a zeotropic blend whose components can separate (fractionate) during recovery, making push-pull or liquid-phase recovery preferable.

  3. A technician recovers refrigerant into a cylinder that already contains a different refrigerant. What must happen to this cylinder?

    Answer: It must be labeled as mixed/contaminated and sent to a refrigerant reclaimer

    Mixing refrigerants creates a contaminated blend that cannot be reused and must be sent to a certified reclaimer for proper disposal.

  4. What does a 'two-stage' recovery machine do differently than a single-stage unit?

    Answer: It recovers vapor first then switches to liquid recovery automatically

    A two-stage recovery machine first removes vapor refrigerant, then automatically switches to remove liquid refrigerant for more complete recovery.

  5. Under EPA Section 608, technicians working on small appliances (systems with 5 lbs or less of refrigerant) must recover what percentage of refrigerant when using a non-self-contained recovery device?

    Answer: 90%

    When using a non-self-contained recovery device on small appliances, technicians must recover 90% of the refrigerant.

  6. What is the primary purpose of an oil separator used during refrigerant recovery?

    Answer: To separate compressor oil from refrigerant before it enters the recovery cylinder

    An oil separator prevents compressor oil from entering the recovery cylinder, keeping the refrigerant cleaner and reducing contamination.

  7. Which condition requires a technician to evacuate a recovery cylinder before reusing it for the same refrigerant?

    Answer: When the cylinder contains a different refrigerant or is contaminated

    A recovery cylinder must be evacuated before reuse if it contains a different refrigerant or any contamination to prevent cross-contamination.