Why should a new recovery cylinder be evacuated before its first use?
Recovery techniques · EPA 608 Core. The correct answer, and the reasoning behind it.
Keeping refrigerants unmixed and what affects recovery speed.
The question
Why should a new recovery cylinder be evacuated before its first use?
- To check that the cylinder is the correct color and type
- To remove air that would mix with the refrigerantCorrect answer
- To pre-cool the cylinder walls
- To meet the 80 percent fill limit
Why “To remove air that would mix with the refrigerant” is correct
A cylinder full of air would add non-condensables to the recovered refrigerant and raise cylinder pressure. Evacuating it first leaves a clean, empty container.
Source: EPA: Test Topics
Why the other answers are wrong
- To check that the cylinder is the correct color and type — Evacuation has nothing to do with cylinder color.
- To pre-cool the cylinder walls — Pulling a vacuum does not meaningfully cool the cylinder.
- To meet the 80 percent fill limit — The fill limit is met by weighing, not by evacuation.
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