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Siemens Burner Controllers LME1 LME2 LME4 Series

Siemens Burner Controllers LME1 LME2 LME4 Series

Siemens
Siemens Burner Controllers LME1 / LME2 / LME4 Series are gas burner control units designed for the startup, ignition sequencing, and flame supervision of single-stage and two-stage gas burners, including small- to medium-capacity applications. Depending on the model, they support ionization flame detection, compatible UV or blue-flame detectors, undervoltage monitoring, and operational status diagnostics. Suitable for industrial boiler and heating systems, with safety and control functions varying by model.

Product Description

Siemens Burner Controllers LME1 / LME2 / LME4 Series

Siemens LME Series gas burner controls are designed for the automatic startup, ignition sequencing, and flame supervision of single-stage and two-stage gas burners, as well as small- to medium-capacity gas burners operating intermittently, with or without a fan.

The controllers support flame supervision using an ionization probe, compatible QRA UV flame detectors with the AGQ3.xA27 ancillary unit, or QRC blue-flame detectors, depending on the selected model. Integrated operational and fault indication functions support burner diagnostics and maintenance.

Key Features

  • Automatic burner startup and ignition sequence control
  • Single-stage or two-stage gas burner control, depending on model
  • Accurate control sequencing through digital signal processing
  • Integrated undervoltage detection
  • Air pressure switch supervision on applicable models
  • Multicolor LED indication for operating and fault conditions
  • Electrical remote reset capability
  • Limited restart attempts for enhanced operational safety
  • Controlled intermittent operation after a maximum of 24 hours of continuous operation

Available Series

  • LME1 Series: Designed for single-stage gas burners. LME11 models support burner outputs up to 120 kW.
  • LME2 Series: Designed for two-stage gas burners, with model-dependent operating sequences and functions.
  • LME4 Series: Includes LME41 and LME44 controllers for specific gas burner control applications, including atmospheric burners.

Applications

  • Industrial Gas Burner Systems
  • Industrial Boiler Systems
  • Industrial Heating Equipment
  • Forced-Draft and Atmospheric Gas Burners, depending on model
  • Gas-Fired Process Heating Equipment

Note: The exact model number, supply voltage, timing sequence, flame detector compatibility, and safety functions must be verified against the burner manufacturer's requirements before installation or replacement.

Specifications

Siemens LME Series Technical Specifications

Brand Siemens
Series LME1 / LME2 / LME4
Product Type Gas Burner Controls
Fuel Type Gas
Burner Control Single-stage or two-stage, depending on model
Supply Voltage AC 120 V or AC 230 V (+10%/-15%), model-dependent
Mains Frequency 50–60 Hz ±6%
Power Consumption 12 VA
External Primary Fuse Max. T6.3H250V
Flame Supervision Ionization Probe / QRA UV Detector with AGQ3.xA27 / QRC Blue-Flame Detector, depending on model
Flame Failure Response Time Max. 1 second
Status Indication Multicolor LED
Diagnostic Interface OCI400 with ACS410 Software
Degree of Protection IP40 (to be ensured through mounting)
Operating Temperature -20 to +60 °C
Relative Humidity Below 95% RH, non-condensing
Installation Altitude Max. 2,000 m above sea level
Weight Approx. 160 g
Plug-in Base AGK11
Standards DIN EN 298 / EN 676 (applicable use)

Series Comparison

Series Models Application
LME1 LME11 Single-stage gas burners, up to 120 kW
LME2 LME21 / LME22 Two-stage gas burner control
LME4 LME41 / LME44 Model-specific gas burner applications

Note: Safety time (TSA), prepurge timing, ignition sequence, and air pressure supervision functions vary by product model. Refer to Siemens Data Sheet CC1N7101en for model-specific specifications.