Siemens Combustion LFL1.335 Control

The Siemens Combustion LFL1.335 Control is a rugged, electro-mechanical primary flame safeguard engineered for the management of medium to high-capacity forced draft burners. Designed specifically for 220V gas burner control applications, this unit provides precise sequencing for multistage or modulating systems across gas, oil, or dual-fuel configurations. It features a fixed 37-second pre-purge time (t1) and a 2.5-second safety time (TSA), ensuring rigorous adherence to startup protocols. The 01-series design integrates a checked air damper control to verify position before ignition, significantly increasing system reliability. For field technicians, the sequence dial is critical for real-time diagnostic monitoring, indicating the exact phase of the program or the nature of a lockout. Compatible with QRA2, QRA4, QRA10 UV detectors, or an ionization probe, the LFL1.335 is built for intermittent operation, requiring a controlled shutdown every 24 hours to re-verify safety circuits. Its plug-in design simplifies the replacement of older safeguard units in high-demand industrial stationary air heaters and boiler plants.

Key Benefits for Contractors:

• Broad Compatibility: Functions as a universal burner controller for gas, oil, or dual-fuel systems with multistage or modulating firing rates.
• Safety Compliance: Type-tested and approved in accordance with DIN EN 298, meeting strict European standards for combustion safety.
• Reliable Monitoring: Features a built-in lockout indicator and sequence indicator to minimize troubleshooting time during service calls.
• Field Serviceability: Includes an exchangeable unit fuse and a robust plug-in base mounting system (base sold separately) for rapid field swaps.
• Optimized Ignition: Supports both direct spark flame and interrupted pilot burner constructions, providing flexibility for diverse equipment fleets.

Common Questions Regarding the LFL1.335:

How do I troubleshoot a lockout on this control?
Observe the sequence dial behind the viewing window; the symbol indicated at the time of lockout points directly to the failure phase, such as air pressure failure or loss of flame signal.

Can this unit be used for continuous burner operation?
No, the LFL1.335 is rated for intermittent operation only, meaning the burner must undergo at least one controlled shutdown every 24 hours to satisfy safety self-checks. For continuous processes, the LGK16 series is the appropriate technical substitute.

What is the difference between the 110V and 220V versions?
The internal timing and wiring are frequency-dependent. While the LFL1.335 is a native 220V burner control, switching times will vary approximately 17% between 50Hz and 60Hz mains supply.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.