EPA 608 Prep 28, Type III — Low-Pressure Refrigerants and Centrifugal Chillers

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: - How to identify Type III appliances and their associated low-pressure refrigerants like R-11 and R-123. - The critical concept that low-pressure systems operate in a vacuum, causing leaks to pull air and moisture inward. - The primary function of a purge unit and why its excessive operation indicates a system leak. - The correct, exam-specified procedure for leak testing a low-pressure chiller, including the 10 psig nitrogen pressure limit. - Key safety and pressure points to memorize, such as the 15 psig rupture disc setting and the 25 mm Hg absolute recovery requirement. 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