EPA 609 Refrigerant Types & Properties 2

Question 1

What class of refrigerant is R-1234yf?

Accepted Answer

HFO (Hydrofluoroolefin)

Answer

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?

Accepted Answer

It is mildly flammable (A2L classification)

Answer

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?

Accepted Answer

PAG (Polyalkylene Glycol) oil

Answer

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?

Accepted Answer

Mineral oil

Answer

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?

Accepted Answer

Sky Blue (light blue)

Answer

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

EPA 609 - EPA Section 609 Refrigerant Certification Practice Test