EPA 608 Type II · Safety · Medium
Recovering R-454B, an A2L refrigerant, requires what kind of recovery machine?
Answer: C. One rated for A2L (flammable) refrigerants.
- AAny machine already rated for R-410A.
- BA vacuum pump feeding a recovery bag.
- COne rated for A2L (flammable) refrigerants.✓ Correct
- DA low-pressure chiller pump-out unit.
Why C is right
A2L refrigerants can burn under some conditions, so recovery machines, like vacuum pumps, must be designed for them, with sealed or spark-free electrical parts. Check that the recovery cylinder is rated for the refrigerant too.
More Type II questions
- Why must you never pressurize a refrigeration system with oxygen or compressed air?
- Can you pipe two pressure relief valves in series?
- Why must you never start a hermetic compressor while it is in a deep vacuum?
- What service pressure rating must a recovery cylinder have to hold R-410A?
- R-22 has a saturation pressure of about 220 psia at 104°F. Which EPA category does an R-22 appliance fall in?
Go deeper with the study guide A2L Refrigerants and the R-410A Transition: A Tech’s Guide, try the free 10-question test or browse all EPA 608 practice questions.
A practice question written for study, checked against 40 CFR Part 82, Subpart F. It is not an official EPA exam question, and this site is not affiliated with the U.S. EPA.