Type III — Low-PressureQuestion 198 of 240
The deep 25 mm Hg absolute recovery requirement exists for low-pressure appliances because:
a.They operate above atmospheric pressure
b.Their charge is very small
c.Their refrigerant boils near room temp
d.They contain no oil
Explanation
Low-pressure refrigerant boils near room temperature, so recovering it fully requires pulling the appliance down to a deep vacuum of 25 mm Hg absolute to draw out the remaining vapor. Shallow vacuums would leave significant refrigerant behind. The deep level ensures thorough recovery from these vacuum-operating machines.
Law Reference: 40 CFR §82.156This 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
- Which of the following is NOT a low-pressure appliance refrigerant?
- Excessive water in a low-pressure chiller can freeze and rupture tubes because low-pressure refrigerants:
- When handling a large recovery cylinder of R-11 removed from a chiller, the technician must remember to:
- A high-efficiency purge unit on a chiller is often equipped with a purge-rate log because a rising rate:
- Which practice is correct when leak testing a low-pressure chiller that is under a vacuum?
- The main safety concern that sets the 10 psig pressurization limit on low-pressure appliances is:
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