LFL1.333-110V Siemens Gas Burner Control

Overview

The Siemens LFL1.333-110V is a high-performance, electro-mechanical gas burner control designed for the supervision and sequencing of forced draft burners. Specifically engineered for medium to high capacity applications, this unit supports gas, oil, or dual-fuel systems. It is optimized for multistage or modulating burners in intermittent operation, requiring a safety shutdown at least once every 24 hours. The controller integrates a flame amplifier, purge timer, and sequencer into a single, compact plug-in housing, ensuring reliable safety functions for industrial and commercial burner applications.

Features

• Comprehensive burner sequencing and automatic ignition control
• Continuous flame monitoring using UV detectors (QRA series) or ionization probes
• Integrated self-checking mechanism, including a UV sensor functional test
• Visual sequence indication via a built-in dial for real-time status and fault diagnosis
• Checked air damper control and proven air pressure switch monitoring
• Safety interlocks for high fire purge, low fire ignition, and pre-ignition
• Lockout alarm terminal with local and optional remote reset capabilities
• Durable, shock-resistant and heat-resistant plastic housing with a protective viewing window

Specifications

• Model: LFL1.333-110V
• Supply Voltage: AC 100-110 V (+10% / -15%) at 50/60 Hz
• Prepurge Time (t1): 31 seconds
• Safety Time (TSA): 3 seconds
• Pre-ignition Time (t3): 6 seconds
• Post-purge Time (t6): 18 seconds
• Power Consumption: Approximately 3.5 VA
• Protection Rating: Designed for control panel mounting (typically IP40 or higher depending on base)
• Weight: 2.2 lbs (1.0 kg)
• Operating Temperature: -20 C to +60 C

Applications

• Supervision of forced draft gas, oil, and dual-fuel burners
• Multistage or modulating burners in industrial furnaces and commercial boilers
• Stationary air heaters (WLE) conforming to DIN 4794
• Direct main burner ignition or interrupted pilot construction systems
• Integration into burner management systems for industrial process heating and HVAC plants