LME22.331C2 Siemens Burner Control

Overview

The Siemens LME22.331C2 is a sophisticated, microprocessor-based burner control unit designed for the startup and supervision of single or two-stage gas or gas/oil burners. Engineered for intermittent operation, this controller is a critical safety component for small to medium-capacity burners, often used in forced draft applications. It serves as a modern, digital replacement for legacy electromechanical models like the LGB22.330A27 and LMG22.330B27, offering identical housing dimensions for seamless retrofitting. The unit ensures reliable combustion management through precise digital signal processing and comprehensive monitoring of safety parameters.

Features

• Digital signal processing provides accurate and repeatable control sequences for enhanced system reliability
• Multicolor LED indicator provides clear status messages and diagnostic feedback for operational and fault conditions
• Integrated undervoltage detection prevents operation under unsafe electrical conditions
• Air pressure supervision includes a functional check of the air pressure switch during startup and throughout operation
• Electrical remote reset facility allows for efficient system management from a distance
• Repetition limitation feature prevents excessive restart attempts to protect the burner and associated equipment
• Controlled intermittent operation triggers a mandatory safety shutdown after 24 hours of continuous running
• Compatible with ionization probes and QRA flame detectors (via AGQ3 ancillary unit) for flexible flame monitoring

Specifications

• Supply Voltage: AC 220 V to 240 V (50/60 Hz)
• Power Consumption: Approximately 3 VA
• Pre-purge Time (t1): 30 seconds
• Safety Time (TSA): 3 seconds (maximum)
• Pre-ignition Time: 2 seconds
• Waiting Time: 2.5 seconds
• Actuator Running Time: 12 seconds
• Protection Class: IP40 (when mounted)
• Operating Temperature: -20 C to +60 C
• Weight: Approximately 0.16 kg (0.35 lbs)
• Service Life: Up to 250,000 startup cycles (approx. 10 years under normal use)

Applications

• Monitoring and control of one or two-stage gas or gas/oil burners in industrial and commercial settings
• Integration into burner management systems for boilers, furnaces, and hot water generators
• Ideal for forced draft burners where precise air-to-fuel ratio control via an actuator is required
• Replacement and upgrading of legacy Siemens LGB and LMG burner control series in existing HVAC plants
• Suitable for use in OEM products requiring compliance with EN 298, EN 676, and EN 230 standards