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Tech Tips:

HVAC Ghosts of Christmas Past, Present, and Future

There have been many adaptations of A Christmas Carol over the years, but it all started with a novella written by Charles Dickens in the 1840s. It was early in the Victorian Era, fresh off the heels of the Industrial Revolution. The British were reflecting on past Christmas traditions, like caroling, and exploring new ones […]

The Evolving Career of the HVAC Contractor: Embracing Change to Stay Ahead

This tech tip was written by Shelby Breger, co-founder of Conduit Tech. You can check out everything Conduit has to offer and learn more about that interesting platform and how it helps contractors at https://getconduit.com/. Thank you, Shelby! Before starting Conduit Tech, Marisa and I spent a year doing everything we could to learn about […]

Technology Trade-offs

As a small business owner in the 21st century, I have recently been exposed to the overwhelming amount of new technologies and processes that I could use within my business. In the last few years, there has been a surge of software and connected tools that are entering the marketplace. All of them promise to […]

MeasureQuick Talks with Bert

In this livestream MeasureQuick Talks with Bert. This is an impromptu Talk with industry leaders, including Shelby Breger from Conduit and Joe Medosch from MeasureQuick, about how mobile technology is revolutionizing HVAC diagnostics and training. Featuring special guests discussing how modern tools like MeasureQuick and other diagnostic apps are making it easier for technicians […]

LIVE From the ACCA Conference 2024

This episode was recorded live on location at the 2024 ACCA conference in Orlando. Bryan starts by interviewing Marissa Reddy, a co-founder of Conduit Tech, a software company providing load calculation and sales tools for HVAC contractors. Marissa shares insights into what it takes for contractors to successfully adopt new technology in their businesses. […]

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HVAC School – For Techs, By Techs

Real training for HVAC ( Heating, Ventilation, Air Conditioning and Refrigeration) Technicians. Including recorded tech training, interviews, diagnostics and general conversations about the trade.

In this comprehensive training session from the symposium, Tony Gonzalez, Training Director at Fieldpiece, delivers an engaging and practical guide to combustion analysis for HVAC technicians. With 25 years of experience at Fieldpiece—from warehouse worker to training director—Tony brings both technical expertise and real-world application to this 50-minute interactive session focused on the company’s CAT 85 combustion analyzer.

Tony emphasizes that combustion analysis serves four critical purposes: safety, efficiency, equipment specification verification, and liability protection. He makes a compelling business case for investing in combustion analyzers, noting that preventing just two callbacks or one liability lawsuit can pay for the equipment ten times over. The training walks attendees through the complete process, from properly warming up the analyzer in fresh air (allowing sensors to calibrate to ambient oxygen and zero carbon monoxide) to generating professional PDF reports that can be shared with customers or integrated into work order management systems like ServiceTitan.

The session provides detailed guidance on interpreting key measurements, including stack temperature, oxygen percentage, carbon monoxide levels, and draft pressure. Using design parameters from the National Comfort Institute, Tony demonstrates how to diagnose issues by comparing actual readings against acceptable ranges for different furnace types (atmospheric, 80% induced fan, and 90+ percent condensing). He walks through practical troubleshooting scenarios, showing how measurements like high oxygen combined with low stack temperature can point to specific problems like low gas pressure that technicians can then verify and correct.

Throughout the presentation, Tony emphasizes proper technique and best practices, from creating test ports at least 12 inches above the inducer fan to the importance of plugging test ports after completion. He also highlights innovative features of Fieldpiece’s analyzers, including the hydro cycle pump that eliminates traditional water traps, sensor vault technology that extends sensor life to four years, and built-in wireless connectivity allowing technicians to view measurements on their mobile devices through the Job Link app.

Topics Covered:

Why perform combustion analysis: Safety verification, efficiency optimization, OEM specification compliance, and liability protection
Business benefits: Reducing callbacks, improving OEM relationships, enhancing professional image, and protecting against lawsuits
Proper startup procedure: Warming up analyzers in fresh air for accurate oxygen and CO sensor calibration
Ambient CO testing: Using combustion analyzers vs. dedicated walk-around detectors for carbon monoxide detection in living spaces
Test port installation: Proper placement at least 12 inches above inducer fans and away from 90-degree elbows
Key measurements explained: Stack temperature, oxygen percentage, CO PPM, CO air-free, draft pressure, and efficiency calculations
Equipment type selection: Choosing correct settings for atmospheric, 80% induced fan, or 90+ percent condensing furnaces
Diagnostic interpretation: Using National Comfort Institute parameters to identify issues like excess combustion air or low gas pressure
Advanced features: Built-in dual port manometer for gas and static pressure, wireless Job Link app connectivity, and hydro cycle pump technology
Report generation: Creating professional PDF reports with company branding for customer documentation and CYA protection
Maintenance tips: Checking particle filters, understanding sensor vault technology, and the importance of annual calibration
Sensor longevity: Four-year sensor life warranty and field-replaceable sensors without sending equipment for service

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.

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Check out our handy calculators here or on the HVAC School Mobile App for Apple and Android.

Search Episodes

Combustion Analysis w/ Tony G.

12/25/2025

Bryan Orr

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12/23/2025

Bryan Orr