Practice Test Geeks(RSES) Refrigeration Service Engineers Society Certification Practice Test
← All RSES Flashcard Decks

Refrigerant Management Flashcards

7 cards from real RSES 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 Management flashcards as text

  1. A refrigerant is considered 'reclaimed' when it has been reprocessed to meet what standard?

    Answer: ARI/AHRI Standard 700 purity specifications

    Reclaimed refrigerant must meet AHRI Standard 700 purity specifications, which are equivalent to virgin refrigerant quality, before it can be resold.

  2. Which refrigerant application requires EPA Section 608 Type III certification?

    Answer: Low-pressure refrigerants (R-11, R-113, R-123)

    Type III certification covers low-pressure appliances using refrigerants such as R-11, R-113, and R-123, which operate below atmospheric pressure.

  3. What does 'fractionation' mean in the context of refrigerant blends, and when is it most likely to occur?

    Answer: Preferential evaporation of blend components causing composition changes, most likely during vapor-only leaks

    Fractionation occurs in zeotropic blends when components evaporate at different rates during a vapor leak, changing the remaining blend's composition and properties.

  4. Under current EPA regulations, what must happen to refrigerant recovered from a system before it can be returned to a different system owned by a different customer?

    Answer: It must be sent to a certified reclaimer and meet AHRI 700 standards

    Refrigerant recovered from one customer's equipment must be reclaimed to AHRI 700 standards before being used in another customer's equipment.

  5. What is the primary reason ammonia (R-717) is NOT widely used in comfort air conditioning despite its excellent thermodynamic properties?

    Answer: It is toxic and has a strong pungent odor detectable at very low concentrations

    Ammonia is toxic (ASHRAE B2L classification) and has a pungent odor detectable at 5 ppm, making it unsuitable for occupied building comfort cooling applications.

  6. When charging a system with an HFC refrigerant blend like R-404A, the refrigerant must be charged in which state to prevent fractionation?

    Answer: Liquid only

    Zeotropic HFC blends like R-404A must always be charged as a liquid to ensure the correct mixture ratio enters the system and prevent fractionation.

  7. An EPA Section 608 certification is valid for how long before it needs to be renewed?

    Answer: It does not expire — it is valid for life

    EPA Section 608 technician certification does not expire and is valid for the lifetime of the technician who passed the approved certification exam.