EPA 608 609 Section 609 MVAC Systems 3

Question 1

Which refrigerant replaced R-12 in vehicles manufactured from the mid-1990s?

Accepted Answer

R-134a

Answer

R-134a (HFC-134a) replaced R-12 in MVAC systems starting in the mid-1990s.

Question 2

Recovery/recycling equipment for R-12 must meet which standard?

Accepted Answer

SAE J1991

Answer

SAE J1991 sets the standard for R-12 recovery and recycling equipment.

Question 3

Why must R-12 and R-134a never be mixed in the same system?

Accepted Answer

Cross-contamination damages equipment and recycled refrigerant

Answer

Mixing refrigerants cross-contaminates recovery equipment and ruins recycled refrigerant.

Question 4

What fitting design helps prevent accidental mixing of R-12 and R-134a?

Accepted Answer

Unique quick-connect service fittings

Answer

R-134a uses unique quick-connect fittings that differ from R-12 to prevent cross-charging.

Question 5

The newest low-GWP refrigerant adopted for many modern MVAC systems is:

Accepted Answer

R-1234yf

Answer

R-1234yf is a low-global-warming-potential refrigerant used in many newer vehicles.

EPA 608 609 Practice Test