What should the technician do?

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

After shutting off the recovery machine at the required vacuum, the gauge on an R-407C system climbs back toward 0 psig. What should the technician do?

• AOpen the system right away
• BVent the remaining vapor
• CAdd nitrogen to push the vapor out, then open it
• DResume recovery until the level holdsCorrect answer

Why “Resume recovery until the level holds” is correct

A rising pressure shows refrigerant remains in the system or in the oil. Recovery must continue until the required level holds, because the technician must verify that level before opening.

Source: EPA: Test Topics; 40 CFR 82.156(a)

Why the other answers are wrong

• Open the system right away — The required level has not truly been reached, so opening now would release refrigerant.
• Vent the remaining vapor — Venting the remaining refrigerant is prohibited.
• Add nitrogen to push the vapor out, then open it — Adding nitrogen does not remove the refrigerant still in the system.

Practice more of this

More EPA 608 Type II practice questions, or see every EPA 608 practice test.