Overview
The Siemens LME41.054C2 is a microprocessor-based burner control unit designed for the startup and supervision of 1- or 2-stage gas burners in intermittent operation. It is specifically engineered for atmospheric gas burners of small to medium capacity, with or without a fan. This unit serves as a high-reliability safety device, ensuring precise control sequences through digital signal handling and providing advanced diagnostics via a multicolor status indicator. It is frequently used as a modern replacement for legacy models like the LGD12.05A27.
Features
- Microprocessor-controlled digital signal handling for accurate timing and control sequences
- Undervoltage detection mechanism to ensure safe operation during power fluctuations
- Air pressure supervision with functional checks of the air pressure switch during startup and operation
- Multicolor LED for real-time indication of operational status and fault messages
- Electrical remote reset facility for convenient troubleshooting and system recovery
- Limitation of the number of repetitions to prevent unsafe burner operation
- Controlled intermittent operation, requiring a restart after a maximum of 24 hours of continuous run time
- Compatibility with ionization probes and QRA flame detectors (requires AGQ3.xA27 ancillary unit)
Specifications
- Model: LME41.054C2
- Supply Voltage: AC 230 V (-15%/+10%)
- Mains Frequency: 50/60 Hz
- Power Consumption: 12 VA
- Pre-aeration Time (t1): 1 second
- Waiting Time (tw): Max. 2.5 seconds
- Safety Time (TSA): Max. 5 seconds
- Pre-ignition Time (t3): Approx. 1 second
- Post-ignition Time (t3n): Approx. 4 seconds
- Operating Temperature: -20 C to +60 C
- Protection Rating: IP40 (when installed correctly)
- Weight: Approximately 0.13 kg (0.29 lbs)
Applications
- Supervision of 1- or 2-stage atmospheric gas burners
- Used in commercial and industrial heating systems and boilers
- Integration into gas-fired equipment by original equipment manufacturers (OEMs)
- Suitable for forced-draft gas burners when used with appropriate flame detectors
- Applicable in HVAC systems requiring intermittent burner operation and safety shut-off control


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