Siemens LME Series
Compact Burner Control Units for Gas & Oil Burners. Automatic sequencing and safety supervision for reliable combustion.
What is the Siemens LME Series?
The Siemens LME Series is a family of compact burner control units designed for automatic sequencing and safety supervision of gas and oil burners. The LME platform integrates ignition control, flame supervision, safety timing, and automatic shutdown logic into a single compact module.
It is widely used in commercial and light industrial burner systems where reliable combustion safety and structured start-up control are required.
Role Within the Combustion Control Architecture
In a complete burner system, the LME Series acts as the central safety controller. It coordinates:
- Pre-purge timing
- Ignition sequence
- Flame verification
- Continuous flame supervision
- Automatic shutdown in case of fault
Unlike simple relay-based controls, LME units use structured timing logic to ensure compliance with combustion safety standards.
Typical Applications
LME Series burner control units are commonly applied in:
- Gas-fired commercial burners
- Light oil burner systems
- Dual-fuel compact burners
- Commercial boiler systems
- Packaged burner assemblies
They are particularly suited for small to mid-capacity burners requiring standardized safety control.
Integrated Safety
Combines ignition, flame supervision, and safety timing in one module.
Universal Compatibility
Supports gas, oil, and dual-fuel applications with various flame detectors.
Core Functional Characteristics
All LME models share the following operational structure:
- Automatic burner start sequence
- Integrated ignition transformer control
- Flame monitoring compatibility
- Lockout on flame failure
- Pre-purge and safety timing control
- Compact plug-in design
The control unit ensures that fuel supply is only permitted when safe combustion conditions are verified.
Flame Detection Compatibility
The LME Series can be used with compatible flame detection technologies, depending on burner configuration:
- QRB Series – Photoresistive (visible light) detection
- RAR Series – Infrared detection for oil burners
- Selected compatible flame sensors depending on model type
This flexibility allows the LME platform to adapt to various fuel types and burner designs.
Model Differentiation
Although sharing the same control philosophy, LME models may differ in:
- Fuel type configuration (gas, oil, dual-fuel)
- Safety timing sequences
- Electrical connection layout
- Ignition supervision configuration
- Application classification
Model selection must match burner capacity and required safety timing logic.
LME Series Models
* Select a model to view detailed specifications and available inventory.
Selection Guide
When selecting an LME control unit:
- Confirm burner fuel type
- Verify compatible flame detector
- Check required pre-purge timing
- Ensure proper ignition configuration
- Confirm electrical compatibility
Proper configuration ensures reliable automatic burner start-up and safe shutdown in case of flame failure.
Integration Within Burner Systems
In a typical burner system architecture:
- LME Burner Control Unit
- Ignition Transformer
- Flame Detector (QRB / RAR)
- Gas Valve or Oil Solenoid Valve
The LME unit supervises the entire ignition and combustion safety process.
Positioning Within Siemens Combustion Systems
Within the Siemens combustion control portfolio:
- LME Series → Compact burner control units (commercial/light industrial)
- LDU Series → Industrial burner control units
- LMV Series → Advanced burner management systems
LME represents the compact and standardized safety control solution within this hierarchy.
Selection Guide
Frequently Asked Questions
What is the primary function of the Siemens LME Series?
The Siemens LME Series is designed to provide precise and reliable control for industrial combustion systems, ensuring optimal performance, safety, and energy efficiency across various heating applications.
How do I select the right model within the LME Series?
Selecting the correct model depends on your specific application requirements, including operating voltage, required torque or capacity, and control logic (e.g., on-off vs. modulating). Refer to the model overview table above or contact our engineering team for technical assistance.
Are LME Series components suitable for retrofitting existing systems?
Yes, Siemens designs the LME Series with standardization in mind, making them excellent choices for both new installations and retrofitting older or legacy combustion systems to meet modern safety and emissions standards.