LME44.057C2 Siemens Burner Control

Overview

The Siemens LME44.057C2 is a sophisticated burner control unit designed for the startup and supervision of 1- or 2-stage gas or gas/oil burners. Engineered for intermittent operation, this controller is suitable for burners of small to medium capacity, whether equipped with a fan or operating as an atmospheric system. It serves as a direct replacement for the legacy Landis & Gyr LGB41 series, specifically model LGB41.258A27, offering enhanced safety through digital signal processing and undervoltage detection. The unit is housed in a heat-resistant and flame-retardant plastic casing, ensuring durability in demanding industrial and commercial HVAC environments.

Features

• Digital signal processing ensures an accurate and repeatable control sequence
• Undervoltage detection triggers a safety shutdown if power falls below acceptable limits
• Multicolor LED interface provides clear indication of fault status and operational messages
• Air pressure supervision includes a functional check of the air pressure switch during startup
• Electrical remote reset facility allows for simplified system management
• Limitation of restarts helps protect equipment by preventing excessive recycling
• Controlled intermittent operation ensures a safety shutdown after a maximum of 24 hours of continuous use
• Built-in lockout reset button for manual intervention when necessary

Specifications

• Model: LME44.057C2
• Supply Voltage: AC 230 V (50/60 Hz)
• Prepurge Time (t1): 9 seconds
• Safety Time (TSA): 5 seconds
• Pre-ignition Time (t3): 2 seconds
• Power Consumption: 12 VA
• Protection Rating: IP40 (when installed)
• Operating Temperature: -20 C to +60 C
• Weight: Approximately 0.16 kg
• Mounting: Requires AGK11 plug-in base
• Flame Supervision: Ionization probe or QRA flame detector (with AGQ3 ancillary unit) or QRC blue-flame sensor

Applications

• Supervision of 1- or 2-stage gas burners in commercial heating systems
• Control of gas/oil forced draft burners in industrial boiler plants
• Management of atmospheric burners with or without auxiliary fans
• Suitable for use in package burners, line burners, and high-temperature thermal process plants
• Integrated as a core safety component by original equipment manufacturers (OEMs) in gas-fired equipment conforming to EN 676 and EN 298 standards