Mildly Flammable Refrigerants Quiz

 

With the recent passage of the American Innovation and Manufacturing (AIM) Act, and the coming HFC phasedown in the US, mildly flammable refrigerants (Class 2L) are required to meet Global Warming Potential targets and reduce greenhouse gas emissions. While mildly flammable refrigerants such as R-454B and R-32 cannot be retrofitted to non flammable refrigerant systems such as R-410A, the same types of best practices in use today will still be used with A2Ls. Stakeholders in the HVACR industry have been working together to handle A2Ls safely and there are already many millions of A2L systems in use in car AC, window units and PTACs around the globe. If you want to be ahead of this transition, we recommend to start with A2L trainings

Pro tip: many of the quiz questions are answered in the Getting Up To Speed on R-454B Podcast.

Mildly Flammable Refrigerants Quiz

1. What does the 2L class Refrigerant mean?
A. Mildly Flammable
B. Highly Flammable
C. Non Flammable
D. Explosive
2. Which of the following is an A2L refrigerant?
A. R-410A
B. R-290 (Propane)
C. R-454B
D. R-600a (Isobutane)
3. Which of the following tools used with A1 HFC refrigerants can also be used A2Ls?
A. Standard Hand Tools
B. Refrigerant gage sets
C. POE oils
D. All of the above
4. Which of the following types of systems currently use A2L refrigerants?
A. Window AC units
B. Car AC systems
C. PTACs
D. All of the above
5. A mildly flammable refrigerant can be retrofitted into existing R-22 and R-410A system.
A. True
B. False
6. Why is the industry moving to A2L refrigerants?
A. Lower Ozone Depletion Potentials
B. Lower efficiencies
C. Lower Global Warming Potentials
D. All of the above
7. How are A2L disposable cylinders different from A1 cylinders?
A. Red colored band or cylinder top
B. Left hand threads
C. Both A & B
D. Disposable cylinders are not permitted with A2Ls
8. How might A2L systems be different from A1 systems?
A. Onboard leak detection
B. Protective electrical equipment enclosures
C. Flammable refrigerant labels
D. All of the above
9. Which non ODP, low GWP refrigerants are applicable to replace R-410A for HVAC applications?
A. R-454B
B. R-1234yf
C. R-449A
D. R-513A
10. R-454B can be topped off after system leaks are repaired.
A. True
B. False
11. What type of oils can be used for R-454B (A2L Refrigerant) systems?
A. Mineral oils
B. POE oils
C. Alkylbenzene
D. All of the above
12. How do you charge A2L refrigerant blends?
A. As a Vapor
B. As a Liquid
C. Doesn’t matter
D. All of the above
13. Which refrigerant pressure do you use for superheat measurement?
A. Vapor pressure
B. Liquid pressure
C. Bubble point
D. Both B and C
14. Which best describes the flammability behavior of A2Ls?
A. Easy to form flammable concentrations, easy to ignite
B. Hard to form flammable concentrations, hard to ignite
C. Easy to form flammable concentrations, hard to ignite
D. Hard to form flammable concentrations, easy to ignite
15. Which refrigerants have the highest Minimum Ignition Energies (MIEs)?
A. A3s
B. A2Ls
C. A2s
D. All of the above
16. Which of the following will ignite an A2L refrigerant?
A. Static electricity from clothing
B. Turning on a 120 V light switch
C. An open flame, such as a brazing torch
D. A cordless drill
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