EPA 608 Prep 24, Very High-Pressure Refrigerants — R-744 and Subcritical CO2

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: - R-744 (CO2) is the primary very-high-pressure refrigerant on the EPA 608 exam, with operating pressures far exceeding traditional systems. - Servicing R-744 systems requires specialized equipment and gauges rated for pressures that can exceed 2000 psig. - The critical temperature for R-744 is 87.8°F; above this point, the system operates in a transcritical state. - Despite an A1 safety rating, R-744 is a dangerous asphyxiant, and leak detection in enclosed spaces is a critical safety concern. - A Type II or Universal EPA 608 certification is mandatory to legally work on very-high-pressure R-744 systems. 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