EPA 608 Prep 37, Evacuation and Deep Vacuum — Microns and Moisture Removal

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - A micron gauge, not a manifold gauge, is required to measure a deep vacuum and confirm moisture removal. - For high-pressure systems with HFC refrigerants and POE oil, the required evacuation level is below 500 microns. - Moisture left in a system with POE oil can react to form damaging hydrochloric and hydrofluoric acids. - A standing vacuum test is used to verify the system is dry and leak-free after evacuation. - A continuous pressure rise during a standing vacuum test indicates a leak, while a rise that stabilizes indicates outgassing from trapped moisture. For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep