HVAC School - For Techs, By Techs
Gas & Combustion Safety w/ Bert
· Summarized
Key takeaways
- Every gas leak on site becomes your responsibility as a technician; never leave a leak for someone else to handle.
- Monitoring carbon monoxide levels is critical; standard UL-rated detectors may not trigger at low harmful levels.
- Understanding combustion air zones and the potential for backdraft situations is essential for safety.
- Proper venting and avoiding flexible connector failures are crucial in gas appliance installations.
- Combustion analysis should focus on air-free CO levels under 100 ppm, with most issues stemming from airflow problems rather than gas pressure.
Summary
Introduction to Gas Appliance Safety
In this episode, Bryan and Bert kick off their discussion about gas appliance safety by noting that despite Florida's mild winters limiting their gas furnace work, they maintain rigorous safety protocols. They emphasize that the infrequency of encountering gas appliances necessitates stronger training to mitigate risks.
Key Topics in Gas & Combustion Safety
The hosts cover several important topics around gas and combustion safety, including gas leak detection protocols, the importance of monitoring carbon monoxide levels, and understanding combustion air zones. They use real-life anecdotes to illustrate the dangers of neglecting these practices, such as incidents with leaking gas lines and carbon monoxide hazards.
Understanding Gas Appliances and Risks
Bert shares insights into the risks associated with gas appliances, emphasizing that technicians must treat every gas leak as their responsibility, regardless of the job's original focus. They delve into gas pressure testing, the significance of using the correct materials for gas connections, and the implications of improperly vented appliances.
Combustion Analysis Fundamentals
The episode touches on the fundamentals of combustion analysis, discussing necessary measurements such as CO levels in the flue and the target for air-free CO below 100 ppm. The hosts stress the importance of understanding when to make adjustments and recognizing that most flame issues are air-related rather than gas pressure-related.
Importance of Proper Training and Procedures
Brian and Bert conclude with reminders about ensuring proper training and adherence to lockout/tagout procedures. They highlight the need for low-level CO detectors and the importance of communication protocols with customers, stressing safety while respecting homeowner autonomy.
Sponsors
- Carrier · Carrier has been a long-term sponsor of the podcast. They've made it possible very early on for us to do what we do and they are the products that we sell day in and day out, everything from single-stage equipment all the way up to the green speed extreme, one of the most efficient products on the market today.
- Refrigeration Technologies · Refrigeration technologies and their Viper aerosol coil cleaner for condensers and evaporators. It's a fuming cleaner that you can spray into a coil with its really powerful pin spray. It's safe to use with rinsing or no rinse, so there's zero need to bring a bulky pump sprayer into the house for an evaporative coil cleaning or in many refrigeration applications.
- Copeland and White Rodgers Hot Rod Combo · The White Rogers Hot Rod Combo is a 2-in-1 deal. It comes with a universal 120-volt hot surface nitride igniter and a flame sensor in one package, each part replacing over 150 OEM parts. It's a great truck stock item that provides a fresh start when igniter failures occur.
- AHR Expo · The HR Expo is coming back in 2026 as always from February 2nd through February 4th in Las Vegas. It features over 1,000 exhibitors with unique equipment tools, cleaners, software, and educational programs.
Show notes
In this informative episode, Bryan and Bert dive deep into gas appliance safety and combustion analysis from the unique perspective of Florida HVAC technicians. While they humorously acknowledge that Florida's mild winters mean they don't work on gas furnaces daily, they make a compelling case that this actually makes their training even more critical. When technicians only encounter gas appliances occasionally, the stakes are higher—which is why they've developed rigorous protocols to ensure safety every single time.
The conversation covers everything from the basics of gas leak detection to the nuances of carbon monoxide monitoring, combustion air zones, and proper venting. Bryan and Bert share real-world stories of dangerous situations they've encountered, from exploding pool heaters to improperly capped gas lines at vacation rentals. Their approach emphasizes that every gas leak is your problem when you're on site, regardless of why you were originally called out. This episode is packed with practical wisdom for both seasoned professionals working in gas-heavy markets and those who encounter these systems less frequently.
Throughout the discussion, the hosts stress fundamental safety principles that apply across all markets: using your nose to detect leaks, understanding the difference between unspent gas and carbon monoxide, ensuring proper combustion air zones, and never ignoring warning signs like delayed ignition or flame rollout. They also tackle common misconceptions about equipment like flexible gas connectors, orphaned water heaters, and the real risks of cracked heat exchangers.
The conversation wraps up with important reminders about company lockout/tagout procedures, the critical importance of low-level carbon monoxide detectors, and the tools every technician should carry. Bryan and Bert's candid, no-nonsense approach makes complex safety topics accessible while never losing sight of how serious the consequences can be when gas work goes wrong.
Topics Covered
- Gas leak detection and response protocols - Why every gas leak on site becomes your responsibility, using your nose as the first line of defense, and never leaving a leak for someone else to fix
- Carbon monoxide safety and monitoring - Understanding CO as a combustion byproduct, the limitations of standard UL-rated detectors, and the critical importance of low-level CO monitors
- Combustion air zones and depressurization - Identifying risks from sealed spaces, return air leaks, exhaust fans, and other equipment that can create dangerous negative pressure
- Delayed ignition and flame rollout - Recognizing warning signs, understanding causes, and why you should never ignore scorched wires or tripped rollout switches
- Proper gas line assembly and materials - Selecting appropriate materials for different environments, avoiding flexible connector failures, and ensuring proper sizing
- Combustion analysis fundamentals - Measuring CO levels in the flue, targeting air-free CO under 100 ppm, and understanding when adjustments are needed
- Natural draft vs. induced draft systems - Differences in safety considerations, orphaned water heaters, and the myth of oversized flue pipes
- Venting requirements and back drafting - Identifying improper venting, looking for evidence of back draft on water heaters, and ensuring proper flue design
- Gas pressure testing and adjustment - When to adjust and when not to, reading data tags, and understanding that most flame problems are air-related, not gas pressure
- Cracked heat exchangers in context - Why they're less common in warm climates, the role of proper airflow, and focusing on actual safety risks vs. edge cases
- Tools and equipment recommendations - Combustion analyzers, personal protective CO detectors, combustible gas detectors, precision manometers, and low-level CO alarms
- Lockout/tagout procedures - Following company protocols, communicating clearly with customers, and balancing safety requirements with homeowner autonomy
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.
Follow this show on AudioBrevity and new episodes get summarized for you. Create a free account