LME21.230C2 Siemens Burner Control

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