Brahma FM and SM Gas Burner Controllers – Reliable Ignition and Safety

Brahma FM and SM Control Boxes – Smart Ignition and Safety Modules for Burners

Brahma FM and SM are electromechanical control boxes designed to automate ignition, flame monitoring, and safe burner shutdown. These modules are used in gas and oil burners with intermittent operation and are part of the Brahma control box lineup, known for reliability and compatibility across a wide range of heating equipment.

The FM series is modular and mounts onto a standard AB1 base, making it ideal for use in control cabinets and for replacements without rewiring. The SM series is a monoblock with built-in terminals, optimized for compact installations or OEM applications where fast mounting is essential.

Functionality and Operation

These controllers manage the full ignition sequence: pre-purge, ignition transformer activation, and flame signal verification. If no flame is detected within the safety time (TS), the fuel supply is shut off and the system is locked. This mechanism prevents unburned fuel buildup and ensures safety even in unstable conditions.

The TW (pre-purge) and TS (safety) times define how the box behaves during start-up and monitoring. Models in the FM and SM series offer a wide range of time settings, allowing them to be used in everything from compact gas boilers to large diesel burners. For example, TW 3–5s and TS 5–10s are common for gas, while TW 20–40s and TS 15–60s are used in oil-fired systems.

Typical Applications

• Residential and industrial oil and gas burners
• Boilers, water heaters, steam generators
• Drying ovens, hot air generators
• Mobile heating units and IR heaters
• OEM systems requiring compact ignition modules

FM and SM control boxes are widely used for both new installations and retrofits. Their flexibility and clear phase control make them suitable for a broad range of burner systems where safety and reliability are critical.

Choosing Between FM and SM

FM modules are the preferred choice when easy service and modularity are important. They can be replaced without disconnecting wiring, which is useful in field maintenance. SM units are best when installation space is limited or when the control is integrated directly into the burner body. Their one-piece design is faster to mount and ideal for volume assembly.

Diagnostics and Reset

Both series offer clear LED indicators to show system status or fault codes. Depending on the model, the reset can be manual (via push-button) or automatic. This feature is especially important for mobile or inaccessible systems, where visual diagnostics and quick reset are essential for reliability and uptime.

Compatibility and Model Labeling

FM and SM boxes are compatible with Brahma flame sensors (FC7, FC11, FC13), ignition transformers, and bases such as AB or N. Model codes indicate all key parameters: supply voltage, TW and TS timing, ignition type (one- or two-stage), and reset mode. This makes it easy to select the right controller for any burner setup.

• Precise time settings for safety and ignition phases
• Compact or modular formats to fit any installation
• High compatibility with standard burner components
• Reliable operation in challenging conditions
• Easy maintenance and quick replacement

Thanks to their reliability, configurable parameters, and flexible design, burner control boxes are an excellent solution for new and upgraded heating systems alike.

Conclusion

Brahma FM and SM are high-performance burner controllers that ensure safe, automatic ignition and operation of oil and gas heating systems. Their modularity, broad compatibility, and service-friendly features make them a popular choice across the heating and combustion industry.