Low-pressure chillers beyond the basics: purge units, pressurizing vs evacuating, and major vs minor repair. No unsourced leak-test or rupture-disc pressures — figures other guides print without a primary source are deliberately left out. Every answer shows the rule and its citation.
Rules current as of October 26, 2026.
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Studying for the real exam, or a certified tech checking the new rules? Either way, if an old study guide disagrees with an answer here, the citation under the answer is the one to trust.
