EPA 608 Core · Recharging Techniques · Medium
How must a zeotropic blend (400-series) be charged into a system?
Answer: A. As a liquid.
- AAs a liquid.✓ Correct
- BAs a vapor.
- CBy weight as either liquid or vapor.
- DUsing a vaporizing coil only.
Why A is right
To prevent fractionation, 400-series blends must leave the cylinder as a liquid.
More Core questions
- Which PT chart value do you use to calculate subcooling for a zeotropic blend?
- What happens when a zeotropic blend leaks from a system?
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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.