LFL1.635-110V Siemens Gas Burner Control

Overview

The Siemens LFL1.635-110V is a high-performance, electro-mechanical burner control designed for the supervision and management of gas, oil, or dual-fuel burners of medium to high capacity. Engineered for intermittent operation (requiring at least one controlled shutdown every 24 hours), it ensures the safe startup and monitoring of forced-draft burners. This unit is particularly noted for its robust construction, visual sequence indication, and compatibility with various burner controls, including multistage or modulating systems.

Features

• Comprehensive burner sequencing and continuous flame monitoring for increased safety
• Visual sequence indication via a program spindle visible through the front window
• Integrated flame signal amplifier for reliable flame supervision
• Support for both ultraviolet (UV) flame detectors and ionization probes
• Checked air damper control ensuring proper combustion air flow during startup
• Integrated unit fuse and spare fuse for easy maintenance and protection
• Impact-proof and heat-resistant plastic housing for durability in industrial environments
• Optional combustion air blower control and post-purge functionality

Specifications

• Model: LFL1.635-110V
• Supply Voltage: AC 100-110 V (50/60 Hz)
• Pre-purge Time (t1): 66 seconds (at 50 Hz; ~17% shorter at 60 Hz)
• Safety Time (TSA): 2.5 seconds
• Pre-ignition Time (t3): 5 seconds
• Power Consumption: Approximately 3.5 VA
• Protection Rating: IP40
• Operating Temperature: -20 C to +60 C
• Weight: Approximately 2.0 to 2.5 lbs (0.9 to 1.1 kg)
• Certifications: CE, UL, FM, and CSA (North American Approvals)

Applications

• Supervision of gas, oil, or dual-fuel forced-draft burners
• Management of multistage or modulating burners in industrial or commercial boiler systems
• Use with stationary air heaters (WLE)
• Direct main burner ignition or intermittent/interrupted pilot operation
• Ideal for medium to high-capacity combustion plants requiring precise sequence control