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Refrigerant Identification & Testing Flashcards

7 cards from real CFC 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 is the ASHRAE numerical designation for the refrigerant formerly known by the trade name Freon-12?

    Answer: R-12

    Freon-12 is designated R-12 under the ASHRAE refrigerant numbering system, a fully halogenated CFC that was phased out under the Montreal Protocol.

  2. What is the standard AHRI cylinder color for R-134a refrigerant?

    Answer: Sky blue

    R-134a cylinders are painted sky blue (light blue) per AHRI cylinder color-coding standards, distinguishing it from R-22 (light green) and R-12 (white).

  3. When using a refrigerant identifier and receiving a 'FAIL - mixed refrigerant' reading, what does this indicate?

    Answer: The cylinder contains two or more different refrigerants blended together

    A 'mixed refrigerant' failure means the cylinder contains an unintended combination of different refrigerants that cannot be separated and must be sent for destruction, not recovery.

  4. What distinguishes R-410A from R-407C in terms of phase-change behavior during system testing?

    Answer: R-410A has minimal temperature glide while R-407C has a significant glide of 4-7°F

    R-410A is a near-azeotropic blend with minimal temperature glide, while R-407C is zeotropic with a temperature glide of approximately 4-7°F, which affects P-T chart readings.

  5. What is the moisture content limit for reclaimed R-22 per AHRI Standard 700?

    Answer: 10 ppm by weight

    AHRI Standard 700 limits moisture in reclaimed R-22 to 10 ppm by weight to prevent ice formation in expansion devices and hydrolysis that produces corrosive acids.

  6. What is the standard cylinder color assigned to R-12 refrigerant?

    Answer: White

    R-12 refrigerant cylinders are painted white per AHRI cylinder color-coding conventions, distinguishing them from R-22 (light green) and R-134a (sky blue).

  7. What field test can be used to check for the presence of non-condensable gases in a refrigerant cylinder?

    Answer: Compare cylinder pressure to the P-T chart value for the measured cylinder temperature

    Non-condensable gases cause pressure to be higher than the P-T chart predicts for a given temperature because they do not condense and add to the total pressure.