Recovery from a 120-pound R-22 system on a hot roof is going slowly. Which pair of actions would both speed it up?
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
Recovery from a 120-pound R-22 system on a hot roof is going slowly. Which pair of actions would both speed it up?
- Heat the recovery cylinder and cool the appliance
- Lower the machine speed and close the liquid valve
- Use longer hoses and recover vapor first
- Chill the recovery cylinder and warm the applianceCorrect answer
Why “Chill the recovery cylinder and warm the appliance” is correct
Chilling the recovery vessel lowers its pressure, and heating the appliance raises the pressure of the refrigerant being removed. Both widen the pressure difference that moves refrigerant into the cylinder.
Source: EPA: Test Topics
Why the other answers are wrong
- Heat the recovery cylinder and cool the appliance — This does the opposite of each helpful step and narrows the pressure difference.
- Lower the machine speed and close the liquid valve — Closing off the liquid and slowing the machine both slow recovery.
- Use longer hoses and recover vapor first — Longer hoses restrict flow, and vapor-first is slower than liquid-first.
Practice more of this
More EPA 608 Type II practice questions, or see every EPA 608 practice test.
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