Type II — High-PressureQuestion 137 of 240
A technician plans to retrofit an old R-22 system to an HFC blend that uses polyolester (POE) oil. Which statement about the retrofit is correct?
a.Mineral oil works with all HFC blends, so no oil change is needed
b.Recover the R-22 and replace the mineral oil with the POE oil required
c.Retrofitting removes the need for any leak repair
d.The remaining R-22 can be vented since the system is being changed
Explanation
In a retrofit, the existing R-22 must be recovered, never vented, and because most HFC blends are not compatible with mineral oil, the oil is usually changed to polyolester (POE). Components like the filter-drier are commonly replaced and the metering device may need adjustment. Venting during a retrofit is prohibited under Section 608.
Law Reference: 40 CFR §82.154This topic, taught in full in the EPA Section 608 Certification guide. EPA 608 Universal Study Guide (2026) — Core + Type I/II/III, with the 2027 A2L update — PDF + EPUB, $14.99 · 14-day refund →
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Related questions on this topic
- A technician needs to locate a small refrigerant leak on an R-22 condensing unit. Which method is a recognized leak-detection technique?
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- A technician notices R-410A gauge pressures running much higher than an equivalent R-22 system at the same conditions. What does this reflect about R-410A?
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