EPA 608 Prep 38, Brazing and System Opening — Recover First, Always

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: - Always recover refrigerant to 0 psig before applying heat or opening a system to prevent phosgene gas formation and explosions. - During brazing, you must flow a low-pressure purge of dry nitrogen through the tubing to prevent internal oxidation and scale. - Never use compressed air or oxygen for pressure testing; only use dry nitrogen to avoid moisture contamination and explosion risks. - A new filter-drier must be installed every single time a refrigeration system is opened to the atmosphere. - After a repair and successful pressure test, the system must be evacuated to a deep vacuum measured by a micron gauge before recharging. 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