Overview
The Siemens LME21.230C2 is a high-performance, microcomputer-based burner control designed for the startup and supervision of one or two-stage gas or gas/oil burners of small to medium capacity. Operating in intermittent mode, this controller ensures a safe combustion process by providing precise control sequences through digital signal handling. It is widely used by original equipment manufacturers (OEMs) for integration into forced-draft burners, providing critical safety functions such as flame supervision and air pressure monitoring.
Features
- Microcomputer-controlled sequence with digital signal handling for high accuracy
- Integrated flame supervision via ionization probe or QRA flame detector with an AGQ3 ancillary unit
- Air pressure supervision with a functional check of the air pressure switch during startup and operation
- Multi-color LED indication for operational status and comprehensive fault status messaging
- Electrical remote reset facility for convenient troubleshooting and operation
- Under-voltage detection to ensure the burner only operates within safe electrical parameters
- Controlled intermittent operation, triggering a restart after a maximum of 24 hours of continuous operation
- Limitation of the number of restart repetitions to enhance system safety
Specifications
- Model: LME21.230C2
- Mains Voltage: AC 230 V (+10% / -15%)
- Mains Frequency: 50/60 Hz
- Pre-purge Time (t1): 20 seconds
- Safety Time (TSA): 3 seconds
- Pre-ignition Time: 2 seconds
- Power Consumption: 12 VA
- Protection Rating: IP40 (when integrated with appropriate bases)
- Operating Temperature: -20 C to +60 C
- Weight: Approximately 0.14 kg
Applications
- Supervision of 1- or 2-stage gas burners in commercial and industrial heating systems
- Control of gas/oil forced-draft burners when paired with specific flame detectors
- Integration into atmospheric burners with or without fan support
- Suitable for use in HVAC systems, industrial boilers, and thermal process plants requiring intermittent operation
- Replacement for legacy Siemens LGB and LMG series burner controls


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