Heat Exchanger Failure # 4 – Firing Rate.

Flame gasHow can firing rate affect heat exchanger longevity?
If the firing rate is too low, its that same as having low return air temperatures (RAT). Condensation will form, mix with the flue gas and cause corrosion.
A high firing rate is the same as low air flow; the heat exchanger will run hotter than designed, and will eventually crack.
How do you check the firing rate?

Firing rate is determined by manifold pressure, BTU content of the fuel, and orifice size. We’ll be covering those topics in another post.

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Patrick is Zen HVAC’s diagnostic and training guy. Patrick started in the trade the day he left technical school and never looked back. He's served in various technical and training roles in the HVAC industry but specializes in system troubleshooting and diagnostics, retro commissioning, and technical training. His moto: If I can understand it, anybody can. Patrick uses the Zen common sense approach to teach Patrick’s Likes- His Wife, kids and dog. Old pickup trucks. Hiking. The industrial Revolution. Patrick’s Dislikes- Taking work too seriously. Anything unintuitive. Emoticons :( Patrick’s Favorite famous person- Theodore Roosevelt “I am only an average man, But I work harder at it than the average man" Famous Patrick Quote- “Well, that was stupid of me”

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