EPA 609 Refrigerant Types & Properties 2 — Questions and Answers
Question 1: What class of refrigerant is R-1234yf?
- CFC
- HFC
- HFO (Hydrofluoroolefin) (Correct answer)
- HCFC
Correct answer: HFO (Hydrofluoroolefin)
R-1234yf is an HFO (hydrofluoroolefin), a fourth-generation refrigerant with very low GWP and zero ODP.
Question 2: Which property makes R-1234yf require additional safety precautions compared to R-134a?
- It is highly toxic
- It is mildly flammable (A2L classification) (Correct answer)
- It operates at much higher pressures
- It reacts violently with water
Correct 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.
Question 3: What type of oil is used with R-134a systems?
- Mineral oil
- Alkylbenzene oil
- PAG (Polyalkylene Glycol) oil (Correct answer)
- POE (Polyol Ester) oil
Correct 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.
Question 4: What type of oil was used in R-12 MVAC systems?
- PAG oil
- POE oil
- Mineral oil (Correct answer)
- Synthetic compressor oil
Correct answer: Mineral oil
R-12 systems used mineral oil, which is compatible with CFC refrigerants but incompatible with R-134a.
Question 5: Refrigerant cylinders are color-coded to identify the refrigerant inside. What color identifies R-134a cylinders?
- White
- Green
- Sky Blue (light blue) (Correct answer)
- Yellow
Correct answer: Sky Blue (light blue)
R-134a cylinders are color-coded light blue (sky blue) to help technicians quickly identify the refrigerant.
Question 6: What color are R-12 refrigerant cylinders?
- White (Correct answer)
- Sky blue
- Yellow
- Red
Correct answer: White
R-12 cylinders are white, distinguishing them from R-134a (light blue) and other refrigerants.
EPA 609 Refrigerant Types & Properties 2
What class of refrigerant is R-1234yf?