Product Overview
The Siemens LFL1… series is a family of burner sequence and flame safeguard controls designed for forced-draft burners used in industrial heating applications. These controls manage the full combustion sequence — from pre-purge through ignition, flame supervision, and shutdown — and are suitable for gas, oil, or dual-fuel burners of medium to high capacity operating in intermittent duty. The LFL1… controls integrate safety checks, air damper supervision, and flame detection using ionization probes or UV detectors, ensuring safe, reliable burner operation. This data sheet (CC1N7451en) is intended for OEMs integrating the control into heating systems.
Key Features
Automatic Burner Sequencing: Manages the start-up, running, and shut-down sequence safely and reliably.
Flame Supervision: Uses UV detectors (QRA2, QRA4, QRA10) or ionization probes for accurate flame detection and safety lockout if flame is lost.
Air Damper Control: Checked air damper supervision ensures correct air volume during pre-purge and burner operation.
Safety Shutdown & Lockout: Automatic shutoff and lockout features protect the burner and system if unsafe conditions occur.
Modular OEM Design: Designed for integration into system assemblies with plug-in base and standardized interfaces.
Applications
Forced Draft Burners: Controls combustion sequences on gas, oil, or dual-fuel burners requiring reliable ignition and flame supervision.
Industrial Combustion Systems: Used in boilers, heaters, and thermal process applications where safety and combustion precision are critical.
Multistage & Modulating Burners: Supports both multistage and modulating operation in intermittent duty systems.
OEM Burner Integration: Suitable for original equipment manufacturers embedding burner controls within industrial and commercial burners.
Why Choose This Product
High Safety Standards: Compliant with safety standards such as DIN EN 298, the LFL1… controller ensures stringent flame supervision and protective shutdowns.
Versatile Fuel Compatibility: Works with gas, oil, or dual-fuel systems, making it adaptable across a range of burner types.
Enhanced Burner Protection: Checked air damper control and automatic monitoring help prevent unsafe combustion conditions.
OEM-Ready Integration: Designed for easy incorporation into heating systems with support for multiple detector types and circuit interfaces.