Boiler Controls

  • Stand-alone Oxygen trim control
  • Steam or hot water boiler control
  • Saves fuel


The Cleaver-Brooks Accu-Trim is a stand alone, O2 trim control package ideal for those systems without other high-end control requirements. Can be used on new equipment or applied to any boiler as a field retrofit or upgrade.

  • Product Overview
  • Related Resources
  • Applications
  • Stand-alone trim control
  • Air or fuel trim
  • Variable-speed drive option
  • Works with standard or Siemens gas trains
  • User-friendly setup


The Cleaver-Brooks Accu-Trim O2 Trim System is a stand-alone, PLC-based control system designed to maintain the proper fuel-to-air ratio of a boiler/burner. The system will automatically compensate for changes in temperature, barometric pressure, or fuel characteristics, as well as correcting for normal hysteresis. The system is intended for use with single-point positioning, or jackshaft-type, combustion controls; however, it may be customized for special applications such as parallel positioning or alternate fuel firing. A complete system includes oxygen and firing rate sensors, a control panel, which houses the PLC, and an actuator or VSD system, which trims either the fuel or airflow.

Design options include the custom C-B O2 Probe and industrial O2 probes such as Yokogawa. A variable-speed drive is used to provide fuel or air trim. The C-B Accu-Trim works with standard or compact fuel trains such as the Siemens valve assembly. Setup and operation are easy with the user-friendly HMI.


Cleaver-Brooks System Selected for Clemens Food Group Plant →

Provide steam for a new 600,000 square foot pork processing facility.

Boiler Retrofit the Right Solution at Mount Royal University →

Reduce carbon footprint and bring boilers into compliance with local gas code.

Retrofitting Boilers Reduces Emissions and Fuel Usage →

Increase the efficiency and reduce emissions of a nearly 30-year old property.


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