A technician removes the Schrader valve cores from the service ports with a core removal tool before recovering. Why?
Recovery techniques · EPA 608 Core. The correct answer, and the reasoning behind it.
Keeping refrigerants unmixed and what affects recovery speed.
The question
A technician removes the Schrader valve cores from the service ports with a core removal tool before recovering. Why?
- To keep moisture out of the recovery unit
- To reduce restriction and speed recoveryCorrect answer
- To prevent the refrigerant from fractionating
- To allow the system to be vented safely
Why “To reduce restriction and speed recovery” is correct
Schrader cores and the depressors that open them are small restrictions in the flow path. Removing the cores with a core removal tool, which keeps the system sealed, lets refrigerant flow more freely and shortens recovery time.
Source: EPA: Test Topics
Why the other answers are wrong
- To keep moisture out of the recovery unit — Removing cores does not stop moisture; it speeds flow.
- To prevent the refrigerant from fractionating — Fractionation depends on the blend and how it leaks, not on valve cores.
- To allow the system to be vented safely — The system must never be vented; the tool keeps it sealed.
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