EPA 608 609 609 3

Question 1

Which refrigerant replaced R-12 in most vehicles built in the mid-1990s and later?

Accepted Answer

R-134a (HFC-134a)

Answer

R-134a became the standard MVAC refrigerant after R-12 was phased out.

Question 2

What is the newer low-GWP refrigerant being adopted in modern MVAC systems?

Accepted Answer

R-1234yf (HFO)

Answer

R-1234yf is a hydrofluoroolefin with very low global warming potential used in newer vehicles.

Question 3

Why is it illegal to knowingly vent R-134a from an MVAC system into the atmosphere?

Accepted Answer

It is a potent greenhouse gas prohibited from venting under the Clean Air Act

Answer

R-134a has a high global warming potential, and venting it violates the Clean Air Act.

Question 4

Before connecting recovery equipment, why must a technician identify the refrigerant in the system?

Accepted Answer

To avoid cross-contaminating recovery equipment with mixed refrigerants

Answer

Identifying refrigerant prevents cross-contamination of recovery and recycling equipment.

Question 5

What instrument is recommended to confirm the type and purity of refrigerant in a vehicle?

Accepted Answer

A refrigerant identifier

Answer

A refrigerant identifier confirms refrigerant type and detects contamination before service.

EPA 608 609 Practice Test