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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 action is required if a technician discovers that recovered refrigerant in a cylinder tests positive for high moisture content?

    Answer: Send it to a certified reclaimer—do not reuse it on any system

    Contaminated refrigerant with high moisture must be sent to a certified reclaimer; reusing moisture-laden refrigerant can cause acid formation and system damage.

  2. Under EPA Section 608, which entity is solely authorized to reclaim refrigerant back to ARI 700 purity standards for resale?

    Answer: A facility certified by the EPA as a refrigerant reclaimer

    Only facilities that have registered with the EPA as certified refrigerant reclaimers may reclaim refrigerant to ARI 700 standards for resale.

  3. What is the purpose of the Schrader valve depressor tool used during refrigerant recovery?

    Answer: It depresses the Schrader core to allow refrigerant flow without removing the core

    A Schrader valve depressor on recovery hose fittings keeps the valve core pressed open continuously, allowing full refrigerant flow during recovery.

  4. A technician recovers R-134a from an automotive system into a recovery cylinder and wants to reuse this refrigerant in an HVAC system. What is the problem with this plan?

    Answer: R-134a recovered from automotive systems contains PAG oil incompatible with HVAC systems using POE oil

    Automotive systems use PAG oil which is immiscible with the POE oil used in most stationary HVAC systems, making cross-use problematic without reclamation.

  5. What does it mean when a recovery machine's low-pressure switch trips and shuts the machine down during recovery?

    Answer: The suction pressure has dropped below the switch setpoint, indicating the system is nearly empty

    The low-pressure switch protects the recovery machine by shutting off when suction pressure drops too low, typically indicating the system refrigerant charge is nearly depleted.

  6. Which safety precaution is most critical when recovering refrigerant from a system suspected of having a burnout?

    Answer: Use an acid test kit after recovery and replace the recovery machine's filter before next use

    Burned-out systems produce acid and carbonized oil contaminants that can damage recovery equipment, so testing for acid and replacing the machine's internal filter after recovery is essential.

  7. What is the correct way to determine if a recovery cylinder is safe to continue filling during active recovery?

    Answer: Monitor the cylinder's pressure gauge and weight simultaneously against the refrigerant's maximum fill capacity

    Safe fill level is determined by monitoring both pressure and weight—cylinders must not exceed 80% liquid fill by volume, verified by weight at the given temperature.