LFL1.335-110V Siemens Gas Burner Control

Overview

The Siemens LFL1.335-110V is a high-performance electro-mechanical gas burner control designed for the supervision and control of forced draft burners using gas, oil, or dual-fuel. Engineered for burners of medium to high capacity, it manages intermittent operations by ensuring at least one controlled shutdown every 24 hours. The unit features a plug-in design with a shock-resistant plastic housing that integrates a flame amplifier, purge timer, and sequencer into a single reliable unit for safe burner management.

Features

• Comprehensive burner sequencing and automatic ignition control
• Continuous flame monitoring using UV detectors (QRA series) or ionization probes
• Integrated air damper control with position checking for optimal safety
• Visual sequence indication via an indicator dial visible through the front window
• Built-in lockout indicator light and integrated reset button for manual fault clearing
• High fire purge and low fire ignition interlock capabilities
• Internal and spare fuses included for easier maintenance and protection

Specifications

• Model: LFL1.335-110V
• Supply Voltage: AC 100 V to 110 V (+10% / -15%)
• Frequency: 50/60 Hz
• Pre-purge Time: 31 seconds
• Safety Time (TSA): 2.5 seconds
• Flame Failure Response Time: 1 second
• Power Consumption: 3.5 VA
• Protection Rating: IP40
• Operating Temperature: -20 C to +60 C
• Weight: Approximately 2.3 lbs (1.0 kg)

Applications

• Supervision of gas, oil, or dual-fuel forced draft burners of medium to high capacity
• Management of multistage or modulating burners in intermittent operation
• Suitable for use with stationary air heaters (WLE)
• Control of direct spark ignition or interrupted pilot burner constructions
• Industrial and commercial combustion systems requiring precise sequencing and flame safety monitoring