Why O2 Trim is Unnecessary with the ClearFire® Premix Burner

Topics Covered:

  • When O₂ trim is beneficial and when it’s not
  • ClearFire® premix burner’s self-regulating design
  • Turndown ratio and its efficiency impact
  • System strategies for high effective turndown
  • Benefits of ClearFire’s 10:1 turndown in condensing boilers
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Key Takeaways:

  1. O₂ trim is useful for some burners but unnecessary for the ClearFire® premix design.
  2. The ClearFire® maintains a precise 1:1 air-fuel ratio automatically, even with changing conditions.
  3. Ultra-high turndown isn’t always needed—system design can achieve similar benefits.
  4. ClearFire’s 10:1 turndown offers high efficiency, stable operation, and low maintenance in condensing applications.

Author:

Chris Lane, Product Manager, Modular Hydronic Solutions – Cleaver-Brooks

Excerpt:

The Cleaver-Brooks ClearFire® premix burner delivers precise, stable combustion without the need for O₂ trim, thanks to its self-regulating valve-venturi design. With a robust 10:1 turndown and the ability to automatically adapt to changing environmental conditions, it provides high efficiency, reliable performance, and minimal maintenance—making ultra-high turndown systems unnecessary for most applications.




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