LME23.351C2 Siemens Burner Control

Overview

The Siemens LME23.351C2 is a sophisticated microcomputer-based burner control unit designed for the startup and supervision of one- or two-stage gas or gas/oil burners. Engineered for intermittent operation, this controller is suitable for small to medium-capacity burners with or without fan assistance. It serves as a reliable replacement for the legacy LGB32.350A27 series, providing enhanced safety and digital precision. The LME23.351C2 ensures a controlled sequence through digital signal handling and includes integrated actuator control for managing fuel-to-air ratios.

Features

• Digital signal handling provides an accurate and repeatable control sequence
• Undervoltage detection automatically initiates safety shutdowns if power levels drop
• Multicolor LED indicator provides clear visual feedback on operational and fault status
• Air pressure supervision includes a functional check of the air pressure switch during startup and operation
• Electrical remote reset facility allows for efficient troubleshooting from a distance
• Robust housing made of heat-resistant and flame-retardant plastic
• Controlled intermittent operation triggers a safety shutdown after 24 hours of continuous running to perform a restart check

Specifications

• Model: LME23.351C2
• Supply Voltage: AC 230 V (+10%/-15%)
• Mains Frequency: 50/60 Hz
• Prepurge Time (t1): 30 seconds
• Safety Time (TSA): 5 seconds
• Actuator Running Time: 12 seconds
• Power Consumption: 12 VA
• Protection Rating: IP40 (when properly mounted)
• Operating Temperature: -20 C to +60 C
• Weight: Approximately 160g

Applications

• Supervision of single or two-stage forced draught gas burners
• Compatible with QRB photoresistive sensors or QRC blue-flame detectors
• Used in atmospheric burners of small to medium capacity
• Integration into industrial and commercial gas-fired equipment such as boilers and heaters
• Suitable for burners requiring specific actuator-driven air damper control during the startup phase