LME21.330C2 Siemens Burner Control

Overview

The Siemens LME21.330C2 is a high-performance, microprocessor-based burner control designed for the startup and supervision of one- or two-stage gas or gas/oil burners. Engineered for intermittent operation in small to medium-capacity systems, this controller manages critical functions including ignition, flame proving, and safety shutdowns. It serves as a modern, reliable replacement for legacy LGB21 and LMG21 series units, offering enhanced digital signal handling for accurate control sequences.

Features

• Microprocessor-controlled for precise and repeatable timing sequences
• Multicolor LED provides clear indication of operational status and detailed fault diagnostics
• Integrated undervoltage detection ensures the burner safely shuts down during power fluctuations
• Air pressure supervision includes a functional check of the air pressure switch during startup
• Electrical remote reset facility allows for convenient system management
• Robust, heat-resistant, and flame-retardant plastic housing
• Digital signal handling limits the number of repetitions for increased safety

Specifications

• Model: LME21.330C2
• Mains Voltage: AC 230 V (+10%/-15%)
• Mains Frequency: 50/60 Hz (+/- 6%)
• Power Consumption: 12 VA
• Pre-purge Time (t1): 30 seconds
• Safety Time (TSA): 3 seconds
• Degree of Protection: IP40 (when mounted)
• Operating Temperature: -20 C to +60 C
• Flame Supervision: Ionization probe or QRA UV detector (with AGQ3 ancillary unit)
• Weight: Approximately 0.16 kg

Applications

• Supervision of one- or two-stage forced draft gas or gas/oil burners
• Suitable for use with or without a fan motor in intermittent operation
• Ideal for commercial and industrial burner management systems, including boilers and HVAC units
• Designed for integration by original equipment manufacturers (OEMs) into gas trains
• Compliant with EN 298 for gas burners and EN 230 for oil burners