LGK16.635A27 Siemens Flame Safeguard

Overview

The Siemens LGK16.635A27 is a high-performance, electronic burner control unit designed for the supervision and control of gas, oil, or dual-fuel forced draft burners. Engineered for medium to high-capacity applications, this flame safeguard is specifically built for continuous operation, making it ideal for industrial and commercial combustion plants. It features a self-checking flame signal amplifier that continuously monitors the burner’s safety, initiating a lockout in the event of a missing flame signal or a fault within the detection system. Its robust design allows it to replace legacy LFL1 series controls in existing installations, provided compatible flame detectors are used.

Features

• Self-checking flame supervision circuit detects faults in the detector, cables, or signal amplifier
• Supports multistage or modulating burner configurations for precise combustion control
• Integrated air pressure supervision ensures the air damper is in the correct position before and during operation
• Designed for continuous operation (more than 24 hours) or high-demand intermittent cycles
• Plug-in design allows for easy installation and maintenance using a dedicated baseplate
• Status and lockout indicator lamps provide immediate visual feedback for troubleshooting
• Compatible with QRA53 and QRA55 UV flame detectors or ionization probes

Specifications

• Model: LGK16.635A27
• Operating Voltage: AC 220 V to 240 V (50/60 Hz)
• Pre-purge Time (t1): 66 seconds
• Safety Time (TSA): 2.5 seconds
• Pre-ignition Time (t3): 5 seconds
• Post-purge Time: 15 seconds
• Protection Rating: IP40 (when installed)
• Weight: Approximately 0.94 kg (2.07 lbs)
• Operating Temperature: -20 C to +60 C
• Service Life: 250,000 startup cycles (approx. 10 years)

Applications

• High-capacity gas, oil, and dual-fuel forced draft burners
• Continuous operation heating systems in commercial and industrial settings
• Steam boilers and flash-steam generators requiring high safety standards
• Multi-boiler plants using sequencing where burners may operate for extended periods
• Direct-fired air heaters and industrial thermal process plants
• Retrofitting existing LFL1-based burner control systems to meet modern safety regulations