The Siemens LME21 / LME22 Burner Controls are part of the advanced burner management system range, used for automatic control and monitoring of gas burners. These controllers manage the complete burner sequence, including pre-purge, ignition, flame detection, and safety shutdown.

The LME21 series is designed for single-stage gas burners, while the LME22 series supports two-stage burner operation, providing better control and improved energy efficiency.

These controllers feature integrated flame supervision, typically using ionization probes, ensuring that the burner operates only when a stable flame is detected.

Built with microprocessor technology, the LME series offers high reliability, precise timing sequences, and enhanced safety functions compared to traditional burner controls.

They are widely used in industrial boilers, furnaces, and commercial heating systems, ensuring safe and efficient burner performance.

Key Features

• Automatic burner control unit for gas burners

• Supports single-stage (LME21) and two-stage (LME22) operation

• Integrated flame detection via ionization probe

• Microprocessor-based control for precise operation

• Pre-purge, ignition, and post-purge sequence management

• Automatic safety shutdown in case of flame failure

• LED indicators for easy diagnostics

• Compact and robust industrial design

Applications

• Industrial gas burners

• Gas-fired boilers

• Commercial heating systems

• Industrial furnaces

• Hot air generators

• Burner management systems

Why Choose This Controller

• Reliable solution for gas burner automation and safety

• Trusted Siemens burner control technology

• Ensures safe ignition and flame monitoring

• Supports different burner configurations (1-stage / 2-stage)

• Easy diagnostics with LED status indication

Technical Description

The Siemens LME21 / LME22 Burner Controls manage the entire burner operation cycle through a predefined sequence controlled by an internal microprocessor.

During startup, the controller initiates a pre-purge phase to clear any unburned gases, followed by ignition and fuel release. The system continuously monitors the flame using an ionization probe.

If the flame is not detected within the safety time or is lost during operation, the controller immediately triggers a safety shutdown, preventing unsafe conditions.

The LME22 model additionally controls a second stage, allowing the burner to switch between low and high fire modes for improved efficiency and control.

Technical Specifications