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


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