609 Flashcards
7 cards from real EPA 608 609 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 609 flashcards as text
Which refrigerant replaced R-12 in most vehicles built in the mid-1990s and later?
Answer: R-134a (HFC-134a)
R-134a became the standard MVAC refrigerant after R-12 was phased out.
What is the newer low-GWP refrigerant being adopted in modern MVAC systems?
Answer: R-1234yf (HFO)
R-1234yf is a hydrofluoroolefin with very low global warming potential used in newer vehicles.
Why is it illegal to knowingly vent R-134a from an MVAC system into the atmosphere?
Answer: It is a potent greenhouse gas prohibited from venting under the Clean Air Act
R-134a has a high global warming potential, and venting it violates the Clean Air Act.
Before connecting recovery equipment, why must a technician identify the refrigerant in the system?
Answer: To avoid cross-contaminating recovery equipment with mixed refrigerants
Identifying refrigerant prevents cross-contamination of recovery and recycling equipment.
What instrument is recommended to confirm the type and purity of refrigerant in a vehicle?
Answer: A refrigerant identifier
A refrigerant identifier confirms refrigerant type and detects contamination before service.
Refrigerant containers used to store recovered MVAC refrigerant must be which color or marked for the specific refrigerant?
Answer: DOT-approved containers labeled for the specific refrigerant
Recovered refrigerant must be stored in DOT-approved containers labeled for that refrigerant.
What happens to a vehicle's R-12 system that is being retrofitted to R-134a?
Answer: It must use unique service fittings and proper labeling to prevent cross-contamination
Retrofits require unique service fittings and labels to avoid mixing R-12 and R-134a.