Practice Test GeeksEPA 609 - EPA Section 609 Refrigerant Certification Practice Test
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Refrigerant Types & Properties Flashcards

6 cards from real EPA 609 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. What class of refrigerant is R-1234yf?

    Answer: HFO (Hydrofluoroolefin)

    R-1234yf is an HFO (hydrofluoroolefin), a fourth-generation refrigerant with very low GWP and zero ODP.

  2. Which property makes R-1234yf require additional safety precautions compared to R-134a?

    Answer: It is mildly flammable (A2L classification)

    R-1234yf is classified as A2L (mildly flammable), requiring special handling and equipment compared to the non-flammable R-134a.

  3. What type of oil is used with R-134a systems?

    Answer: PAG (Polyalkylene Glycol) oil

    R-134a MVAC systems require PAG oil because mineral oil is not miscible with R-134a and will cause compressor failure.

  4. What type of oil was used in R-12 MVAC systems?

    Answer: Mineral oil

    R-12 systems used mineral oil, which is compatible with CFC refrigerants but incompatible with R-134a.

  5. Refrigerant cylinders are color-coded to identify the refrigerant inside. What color identifies R-134a cylinders?

    Answer: Sky Blue (light blue)

    R-134a cylinders are color-coded light blue (sky blue) to help technicians quickly identify the refrigerant.

  6. What color are R-12 refrigerant cylinders?

    Answer: White

    R-12 cylinders are white, distinguishing them from R-134a (light blue) and other refrigerants.