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Siemens LME1 / LME2 / LME4 Gas Burner Controllers

Siemens LME1 / LME2 / LME4 Gas Burner Controllers

Siemens
Siemens LME1, LME2 and LME4 Series are microcontroller-based gas burner controls for automatic startup, ignition sequencing, flame supervision and safety monitoring of small- to medium-capacity burners operating intermittently. The series includes LME11, LME21, LME22, LME23, LME41 and LME44 for model-specific single-stage, two-stage and atmospheric gas burner applications. Depending on the variant, flame supervision uses an ionization probe, QRA UV detector with AGQ3.xA27 ancillary unit, or QRC1 blue-flame detector on LME23. Features include undervoltage monitoring, remote reset, multicolor LED diagnostics and digital program sequencing for industrial boilers and heating equipment.

Product Description

Siemens Burner Controllers LME1 / LME2 / LME4 Series

Siemens LME1 / LME2 / LME4 Series are automatic gas burner controls designed to supervise the startup, ignition sequence and safe operation of small- to medium-capacity gas burners in intermittent operation.

These microcontroller-based units provide digital burner sequencing, flame supervision, undervoltage detection and fault diagnostics. Depending on the selected model, they can be used with forced-draft or atmospheric gas burners, with or without a fan.

Flame supervision uses an ionization probe or a compatible QRA UV flame detector with an AGQ3.xA27 ancillary unit on supported AC 230 V configurations. The QRC1 blue-flame detector is supported by the LME23 series.

Key Features

  • Automatic gas burner startup and ignition sequencing
  • Single-stage or two-stage burner control, depending on model
  • Accurate digital program sequencing
  • Integrated undervoltage detection
  • Air pressure switch supervision on applicable models
  • Multicolor LED for operating status and fault indication
  • Electrical remote lockout reset
  • Model-dependent restart limitation and safety lockout
  • Controlled intermittent operation after a maximum of 24 hours
  • Diagnostics using OCI400 and Siemens ACS410 software

Available Series

  • LME1 / LME11: Single-stage gas burner controls; LME11 applications include burner capacities up to 120 kW.
  • LME2 / LME21 / LME22: Controls for two-stage gas burners with model-specific operating sequences. The LME2 family also includes LME23 variants with QRC1 blue-flame supervision.
  • LME4 / LME41 / LME44: Controls for specific gas burner applications, including compatible atmospheric burners. Safety sequences and restart behavior vary by variant.

Flame Detection

  • Ionization Probe: Flame supervision for compatible gas burners
  • QRA UV Flame Detectors: Selected QRA2, QRA4.U and QRA10.C variants with AGQ3.xA27 on compatible AC 230 V controllers
  • QRC1 Blue-Flame Detector: LME23 models only

Industrial Applications

  • Industrial gas burner systems
  • Industrial steam and hot water boilers
  • Industrial heating equipment
  • Compatible forced-draft and atmospheric gas burners
  • Gas-fired process heating equipment

Product Selection Guidelines

Confirm the exact LME model, supply voltage, burner stages, flame detector compatibility, air pressure switch configuration, ignition safety time, startup program and existing wiring before installation or replacement.

Important: Available flame detectors, safety sequences and restart functions vary by model. Installation and commissioning must be performed by qualified personnel following Siemens technical documentation.

Specifications

Siemens LME1 / LME2 / LME4 Series Technical Specifications

BrandSiemens
SeriesLME1 / LME2 / LME4
Product TypeGas Burner Controls
Fuel TypeGas
Burner ControlSingle-stage or two-stage, depending on model
Operating ModeIntermittent Operation
Supply VoltageAC 120 V or AC 230 V (+10% / -15%), model-dependent
Mains Frequency50-60 Hz ±6%
Power Consumption12 VA
External Primary Fuse6.3 A, slow-blow
Flame SupervisionIonization Probe / compatible QRA UV Detector with AGQ3.xA27 on AC 230 V models / QRC1 on LME23 only
Flame Failure Response TimeMax. 1 s, subject to model and flame supervision configuration
Air Pressure SupervisionAvailable according to model and burner configuration
Undervoltage DetectionIntegrated
Remote ResetSupported
Status IndicationMulticolor LED
Diagnostic InterfaceOCI400 with ACS410 Software
Degree of ProtectionIP40 when correctly installed
Operating Temperature-20 to +60 °C
Relative Humidity<95% RH, non-condensing
Installation AltitudeMax. 2,000 m above sea level
WeightApprox. 160 g
Plug-in BaseAGK11 series; select the compatible version
StandardsDIN EN 298; EN 676 for applicable forced-draft gas burner installations
Technical ReferenceSiemens CC1N7101en (19.03.2024)

Series Comparison

SeriesModelsApplication
LME1LME11Single-stage gas burners, up to 120 kW for applicable LME11 installations
LME2LME21 / LME22 / LME23Two-stage gas burners and model-specific flame supervision; QRC1 on LME23
LME4LME41 / LME44Model-specific gas burner applications, including compatible atmospheric burners

Technical Note: Ignition safety time (TSA), prepurge time, air pressure supervision and fault response vary by model. QRA UV detection with AGQ3.xA27 requires a compatible AC 230 V controller. QRC1 blue-flame supervision applies to LME23. Plug-in bases and flame detectors must be selected separately. Consult Siemens CC1N7101en before ordering or replacing the controller.