Why does removing liquid at the start of recovery from an R-11 chiller save time?
Recovery techniques · EPA 608 Type III. The correct answer, and the reasoning behind it.
Liquid then vapor, heating oil, protecting water tubes, and high-pressure cut-outs.
The question
Why does removing liquid at the start of recovery from an R-11 chiller save time?
- Liquid recovery needs no certified equipment
- Liquid recovery skips the 25 mm Hg requirement
- Liquid moves far more refrigerant per minute than vaporCorrect answer
- Liquid leaves the oil behind, along with all the refrigerant dissolved in it
Why “Liquid moves far more refrigerant per minute than vapor” is correct
A pound of liquid takes up far less volume than a pound of vapor, so pulling the liquid first moves most of the charge quickly. Vapor recovery then handles what is left.
Source: EPA: Test Topics
Why the other answers are wrong
- Liquid recovery needs no certified equipment — Certified equipment is required whether liquid or vapor is recovered.
- Liquid recovery skips the 25 mm Hg requirement — The chiller must still reach 25 mm Hg absolute.
- Liquid leaves the oil behind, along with all the refrigerant dissolved in it — Leaving refrigerant in the oil does not save time; it has to be recovered too.
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