Siemens produces a wide range of burner control units for industrial, marine, and commercial combustion systems. These controllers manage the safe startup, operation, and shutdown of burners across oil, gas, and dual-fuel applications. Whether the system requires basic two-stage ignition or advanced modulating control with integrated air damper logic and flame supervision, Siemens offers a solution built to meet strict international safety standards.

We highlight the most commonly used Siemens burner controllers, including the LAL series for oil burners and other key product lines such as LFL, LOK, LGK, LOA, and LFE. Each series is designed for specific burner types and regulatory environments.

If you need a new Siemens Burner Control Unit, please send us the type of the burner control unit. Contact us at enquiries@wieslochmarineandindustries.com.

The Siemens LAL series burner control units are designed for the automatic start-up, operation, and supervision of oil burners with medium to high capacity. These controllers are widely used in marine and industrial burner systems that require a high level of safety and reliability. They are compatible with multistage and modulating burners and support both intermittent operation and monitored air damper control.

Each Siemens LAL burner controller uses a cam-driven startup sequence, meaning it follows a mechanically timed program to start the burner in a safe and controlled manner. During this sequence, the unit precisely coordinates the movement of the air damper (which regulates combustion air), the activation of the ignition system, the monitoring of the flame signal, and the staged release of fuel through one or two fuel valves. Built-in safety checks are performed at each step. These include flame signal verification (to confirm the presence of a stable flame), extraneous light testing (to ensure no false flame signal before ignition), valve position monitoring, and air pressure supervision (to verify that combustion air is present and sufficient). If any abnormal condition is detected, the controller immediately interrupts the fuel supply and initiates a lockout. The cause of the shutdown is indicated via a mechanical fault display (a rotating symbol window) and an LED signal lamp. The unit can be reset either locally by pressing the button or remotely via a control signal.

All models in the LAL series are compatible with Siemens photoresistive detectors (QRB1, QRB3), blue-flame detectors (QRC1), or photocell detectors (RAR9), depending on burner type and safety requirements. Additional features such as remote reset, external lockout indication, and galvanically separated actuator control are supported.

If you need a new Siemens Burner Control Unit, please send us the type of the burner control unit. Contact us at enquiries@wieslochmarineandindustries.com.

In addition to the LAL series, Siemens offers a range of burner control units tailored to specific burner types, fuel systems, and safety requirements. These include the LFL, LOK, LGK, LOA, and LFE series — all widely used in industrial, marine, and commercial heating systems. Each series is engineered to meet different operational and regulatory demands, while maintaining the high safety and reliability standards Siemens is known for.

The Siemens LFL series is a versatile solution for controlling forced-draft burners that operate on gas, oil, or dual-fuel. These controllers are ideal for multi-stage or modulating burners and include built-in support for air damper actuators, pre- and post-purge sequencing, and flame monitoring via ionization probes or UV detectors such as the QRA series. Common models like the LFL1.122, LFL1.335, and LFL1.638 are frequently used in Weishaupt RL, WM-G, and WK burners, and are available with various timing configurations to match burner size and application.

The LOK and LGK series are Siemens’ burner controllers with integrated self-checking flame supervision, developed to meet enhanced safety standards such as TRD 411/412 for steam boilers. The LOK series is used for oil burners, while the LGK is designed for gas and dual-fuel systems. These units constantly verify the integrity of the flame signal circuit and are typically installed in installations where continuous operation or regulatory compliance is required. Models such as the LOK16.250, LGK16.122, and LGK16.635 offer compatibility with RAR and QRA flame detectors and are directly replaceable in many Weishaupt systems.

For compact or domestic burner systems, the Siemens LOA series remains a widely recognized solution. Although many LOA models are now considered legacy products, they are still in active use in older one- or two-stage oil burners. These compact controllers, such as the LOA24.171B27, are suitable for intermittent operation and are often replaced today with newer models like the LMO series, which retain the same footprint but offer digital performance.

Finally, the LFE series serves niche applications where extended purge times or non-standard timing sequences are required. Functionally similar to the LAL range, LFE controllers such as the LFE10 are built for industrial oil burners with longer ignition and ventilation demands. These units are often selected for systems with customized startup requirements or where additional airflow management is critical.

If you need a new Siemens Burner Control Unit, please send us the type of the burner control unit. Contact us at enquiries@wieslochmarineandindustries.com.