An R-454B Ramble w/ Elliot

In this raw and unfiltered episode, Bryan sits down with Elliot, a senior service tech and newly minted install supervisor, to discuss the realities of working with R-454B refrigerant in the field. What starts as a technical discussion about the new A2L refrigerant quickly evolves into a candid conversation about industry frustrations, manufacturer accountability, and the practical challenges technicians face with the latest refrigerant transition. With four years of hands-on experience, Elliot brings fresh perspectives on everything from charging procedures to equipment reliability issues. The conversation takes an honest look at the R-454B rollout, which Bryan describes as a massive industry failure. Unlike typical manufacturer talking points, this episode dives into real problems technicians are experiencing: extended charging times, subcooling drift, and equipment component failures. Bryan and Elliot discuss how R-454B systems can take up to an hour to stabilize compared to the 15-20 minutes they were accustomed to with R-410A. This isn't just an inconvenience—it's affecting how technicians approach charging procedures and follow-up visits. The episode also explores theoretical explanations for R-454B's unusual behavior. Bryan presents two hypotheses about why the refrigerant takes so long to reach equilibrium: either density differences between R-32 and R-1234yf are causing stratification in the condenser, or one component is settling at the top and acting like a non-condensable. While admitting he's "not a mathy details guy," Bryan encourages field technicians to investigate these phenomena using thermal imaging cameras and careful observation. This practical, boots-on-the-ground approach to understanding new technology exemplifies the podcast's commitment to real-world problem-solving. Beyond technical discussions, the conversation touches on broader industry issues, including the politics behind refrigerant selection, manufacturer warranty support (or lack thereof), and the challenges faced by contractors trying to maintain fair pricing while dealing with new equipment failures. Bryan and Elliot also address the reliability concerns with new A2L safety components like dissipation boards and refrigerant sensors, noting that while failure rates aren't dramatically higher than other components, they represent additional potential failure points that weren't previously necessary. Topics Covered R-454B Charging Behavior: Extended stabilization times (up to 1 hour vs. 15-20 minutes for R-410A) and subcooling drift over timeField Charging Strategy: Why technicians are intentionally undercharging slightly and relying more on line length specificationsA2L Safety Components: Dissipation boards and refrigerant leak sensors—their function, failure rates, and nuisance alarmsRefrigerant Stratification Theory: Potential explanations for delayed equilibrium involving density differences and non-condensable behaviorIndustry Politics: The R-454B vs. R-32 debate, GWP legislation, and lobbying efforts that shaped current refrigerant standardsManufacturer Accountability: Warranty support issues, untested components, and the financial burden on contractorsRecovery and Reuse Concerns: Questions about blend consistency when recovering R-454B and tank contamination issuesFuture of HVAC: Discussion of heat recovery chillers, secondary fluid systems, and emerging refrigerant-free technologiesPressure Testing Requirements: New legislation requiring extended pressure tests and improved brazing practicesPractical Field Advice: Using thermal imaging to diagnose condenser behavior and verify proper refrigerant distribution Have a question that you want us to answer on the podcast? Submit your questions at https://www.speakpipe.com/hvacschool. Purchase your tickets or learn more about the 7th Annual HVACR Training Symposium at https://hvacrschool.com/symposium. Subscribe to our podcast on your iPhone or Android. Subscribe to our YouTube channel. Check out our handy calculators here or on the HVAC School Mobile App for Apple and Android.