A technician recovering from a small appliance notices the recovery cylinder is not pulling below atmospheric pressure. Which factor most likely prevents reaching the 4 inches Hg vacuum alternative?
Explanation
If a system will not pull into a vacuum, the usual causes are a restriction in the access path, a closed or partially opened valve, or a recovery cylinder that is full or at high pressure. The technician should check the connections, valves, and cylinder before assuming the appliance is empty. The 4 inches Hg vacuum is a valid recovery alternative for small appliances regardless of refrigerant type.
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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