Practice Test Geeks(313D) Residential Air Conditioning Systems Mechanic Certification Practice Test
← All 313D Flashcard Decks

Refrigerant Handling and Recovery Flashcards

7 cards from real 313D 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 Handling and Recovery flashcards as text

  1. The global warming potential (GWP) of R-410A compared to R-22 is:

    Answer: Higher — R-410A has a GWP of approximately 2088 vs. R-22's 1810

    R-410A has a GWP of approximately 2088, which is higher than R-22's GWP of 1810, although R-410A has zero ozone depletion potential.

  2. A technician discovers a refrigerant leak during routine service and the system charge is less than 50 lbs. Under EPA Section 608, the technician must:

    Answer: Inform the equipment owner but no EPA reporting is required for systems under 50 lbs

    EPA Section 608 mandatory leak repair requirements only apply to appliances with 50 or more pounds of refrigerant charge; smaller systems have no federal repair mandate.

  3. What is the correct procedure when a recovery machine's internal pressure relief valve opens during operation?

    Answer: Stop recovery immediately, allow the machine to cool, and investigate the cause

    A relief valve opening indicates dangerous over-pressure; the technician must stop the machine, identify the cause (blocked discharge, overfilled cylinder, etc.) before resuming.

  4. Which type of refrigerant oil is exclusively used with R-410A systems?

    Answer: Polyolester oil (POE)

    R-410A systems require polyolester (POE) oil because R-410A is not miscible with mineral or alkylbenzene oils, which would cause oil separation and compressor failure.

  5. During refrigerant recovery, what does a rising pressure on the recovery machine's discharge gauge while the suction side is in deep vacuum most likely indicate?

    Answer: Non-condensable gases (air) are present in the recovered refrigerant

    Non-condensable gases like air do not condense at normal recovery temperatures, causing discharge pressure to rise even after the suction side reaches deep vacuum.

  6. Under current EPA venting prohibition rules, which substance may still legally be vented to atmosphere under specific conditions?

    Answer: Nitrogen used to pressurize a system for leak testing

    Nitrogen is not a refrigerant and is not subject to the EPA venting prohibition; it may be vented after leak testing or pressurization procedures.

  7. A technician performing refrigerant recovery notes the ambient temperature is 95°F and the recovery cylinder is hot to the touch. The correct action is to:

    Answer: Cool the recovery cylinder with ice or water to lower its pressure and allow continued recovery

    Cooling a hot recovery cylinder reduces its internal pressure, increasing the pressure differential that drives refrigerant flow and improves recovery efficiency.