How does chilling the recovery cylinder speed up recovery from an R-410A system?
Recovery techniques · EPA 608 Type II. The correct answer, and the reasoning behind it.
Recovering liquid first, speeding recovery, and avoiding cross-contamination.
The question
How does chilling the recovery cylinder speed up recovery from an R-410A system?
- It thickens the oil so less is carried over
- It lowers cylinder pressure, widening the pressure differenceCorrect answer
- It lets the cylinder be filled past 80 percent of its liquid capacity
- It removes non-condensables from the refrigerant
Why “It lowers cylinder pressure, widening the pressure difference” is correct
Cooling the recovery vessel lowers the pressure of the refrigerant inside it. A bigger pressure difference between the appliance and the cylinder makes refrigerant flow into the cylinder faster.
Source: EPA: Test Topics
Why the other answers are wrong
- It thickens the oil so less is carried over — Oil thickness is not the reason chilling helps.
- It lets the cylinder be filled past 80 percent of its liquid capacity — Chilling never raises the safe fill limit of a cylinder.
- It removes non-condensables from the refrigerant — Temperature alone does not separate non-condensables.
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