
Boiler Startup And Combustion Testing: What To Check Before Leaving The Job with David Nicholson
In this episode of the HVAC Know It All Podcast, host Gary McCreadie talks with David Nicholson, Training Manager at NTI Boilers, about boiler installation and startup. They cover vent placement, system water management, air removal, combustion testing, and verification before leaving a job. Technicians will learn how installation choices and thorough commissioning can help prevent recurring problems. David draws on site visits, product troubleshooting, and work with research and development on new products. His experience with installation mistakes and service calls informs his advice to treat minimum requirements as limits rather than targets and to build checklists around work actually performed. Key Takeaways How exceeding minimum clearances and increasing intake-to-exhaust separation where possible can help reduce exhaust contamination at the boiler intake. Why controlling makeup water with a dedicated feeder can help expose ongoing leaks rather than allow automatic refilling to mask them. How thorough air removal, combustion analysis, gas-pressure checks, and inspection of venting and condensate drainage support a complete boiler startup. Why carbon monoxide readings deserve close attention during combustion testing and can reveal problems that calculated carbon dioxide readings alone may not make apparent. How checklists can reduce missed startup steps when technicians focus on performing and verifying the work rather than simply completing the paperwork. Key Timestamps 00:00 – Episode and Guest Introduction 01:28 – Combi boilers versus separate heating and domestic hot water equipment, installation mistakes 03:35 – What are some of the big glaring problems you see as a trainer 08:05 – Air bleeders, their usage and disadvantages 11:51 – After-installation checks to ensure smoothly operating boilers 15:50 – Main components of combustion tests 17:52 – Discussion about products, manufacturers, and episode closing This Episode is Kindly Sponsored by: Cintas: https://www.cintas.com/hvacknowitall Cool Air Products: https://www.coolairproducts.net/ SupplyHouse: https://www.supplyhouse.com/tm Use promo code HKIA5 to get 5% off your first order at Supplyhouse! Follow the Guest and His Company on: David Nicholson - LinkedIn: https://www.linkedin.com/in/david-nicholson-7a9884118/ NTI Boilers - LinkedIn: https://www.linkedin.com/company/ntiboilers/ NTI Boilers - Company Website: https://www.ntiboilers.com/ Follow the Host on: LinkedIn Profile: https://www.linkedin.com/in/gary-mccreadie-38217a77/ LinkedIn - HVAC Know It All: https://www.linkedin.com/company/hvac-know-it-all-inc Website: https://www.hvacknowitall.com Facebook: https://www.facebook.com/people/HVAC-Know-It-All-2/61569643061429/ Instagram: https://www.instagram.com/hvacknowitall1/ Follow the Podcast on: YouTube: https://www.youtube.com/@HVACKnowItAll Spotify: https://open.spotify.com/show/6LCBJGw0EHG03rdWHxUMce Apple Podcasts: https://podcasts.apple.com/us/podcast/hvac-know-it-all-podcast/id1359253455


















