Energy Combustion

The Siemens LMV series (Linkageless Management System) represents the high-end tier of burner control. Unlike traditional controllers (like the LME or LFL), the LMV system replaces mechanical cams and linkages with electronic actuators, allowing for high-precision fuel-to-air ratio control.

The system is primarily divided into two platforms: LMV2/3 (for mid-range burners) and LMV5 (for high-capacity industrial burners).  

Here are the specific models and their technical details.

The model number identifies the burner complexity and fuel type it can handle.

• Supply Voltage: 120V AC or 230 V AC (Suffix A1 = 120V, A2 = 230V.

• Frequency: 50- 60Hz}.

• Power Consumption: < 30VA}.

• Safety Level: SIL3 rated (highest safety standard for burners).

• Communication: Internal CAN bus for actuators; Modbus RTU for BMS integration.

• Ambient Temp: -20°C to +60°C.

• Mounting: DIN rail or screw mounting inside a control cabinet (IP00 rating).

The LMV base unit cannot function without these peripheral devices:

These are the screens used to program the fuel/air curves.

• AZL21: Small, icon-based display for LMV2/3.

• AZL23: Text-based display for LMV2/3.

• AZL52: High-resolution text display for LMV5 (supports graphics and trend logs).

These replace the mechanical linkages and rods.

• SQM33: Compact stepper motor (up to 3 Nm} torque).

• SQM85/91: Large industrial actuators (up to 60{ Nm} torque).

• Precision: 0.1° resolution for extremely tight combustion control.

• QRA / ION: Flame sensors (UV or Ionization).

• PLL52: The O2 Trim module (only for LMV52).

• Curve Points: Allows for up to 15 individual points to be set for the air/fuel ratio across the burner's firing range (Low fire to High fire).

• VFD Control: The LMV37 and LMV5 series can control the combustion air fan speed via a 4- 20mA or 0-10textVsignal to save electricity.

When ordering, pay attention to the end of the model string:

• .200: Standard version.

• .300: Version with extended functions (like FGR - Flue Gas Recirculation).

• A2: 230V operation. 

The Siemens LMO series consists of microprocessor-based oil burner controllers used for the startup and supervision of forced draft oil burners. They are the modern, electronic replacement for the older, purely mechanical LOA series.

1. Popular LMO Models

The model number typically indicates the burner stage (single or two-stage) and the specific timing/functionality.

2. Technical Specifications

• Mains Voltage: $230\text{V AC}$ or $120\text{V AC}$ (Suffix A2 = $230\text{V}$, A1 = $120\text{V}$).

• Frequency: $50\dots 60\text{ Hz}$.

• Power Consumption: Approx. $12\text{ VA}$.

• Flame Monitoring:

  • Optical: QRB series (Yellow flame).

  • Blue Flame: QRC series.

• Protection Class: IP40.

• Operating Temp: $-20\text{°C}$ to $+60\text{°C}$.

• Service Life: $250,000$ start cycles (approx. 10 years).

3. Key Functional Features

• Multicolor LED Indicator: The transparent reset button provides visual status:

  • Green: Operation (flame OK).

  • Yellow: Pre-purge/Ignition phase.

  • Red: Fault/Lockout.

  • Flashing Red: Error code diagnostic mode.

• Undervoltage Detection: If the voltage drops below $165\text{V}$ (for $230\text{V}$ models), the controller prevents startup or shuts down safely.

• Oil Pre-heater Support: Includes dedicated terminals to wait for the oil heater to reach the correct temperature before starting the motor.

• Bridging Contact: Integrated contact for oil pre-heaters to ensure they remain hot during operation.

4. Fault Diagnostics (Blink Codes)

If the controller locks out (Red light), holding the reset button for $>3$ seconds will trigger a blink sequence:

5. Compatibility & Retrofitting

The LMO series was designed with the same footprint as the old LOA series.

• Direct Swap: You can usually replace an LOA24 with an LMO24 using the existing terminal base (AGK11).

• Upgrade Benefit: Switching from LOA to LMO adds undervoltage protection and more precise electronic timing.

Energy Combustion, Ahmedabad importer and suppliers of SIEMENS make burner sequence controller.

The Siemens LAL 1.25 and LAL 2.25 are oil burner sequence controllers used for the startup and supervision of oil atomizing burners of medium to high capacity.

While they share the same physical footprint and many technical specs, the primary difference lies in air pressure supervision.

• Application: Used for yellow-flame or blue-flame burners where the air damper position is checked, but the actual air pressure is not monitored by the controller itself.

• Flame Supervision: Supports the QRC1 blue-flame detector, making it a popular choice for "Blue Flame" burners.

• Fault Indication: The lockout indicator is coupled to the sequence switch spindle and shows fault symbols (e.g., failure to ignite, extraneous light).

• Application: Universal oil burner control for multistage or modulating burners.

• Air Pressure Check: This model performs a functional check of the air pressure monitor during startup. If the air pressure switch does not close or opens during operation, the LAL 2.25 will trigger a safety lockout.

• Reliability: Rated for approximately 250,000 startup cycles, ensuring a long service life in industrial environments.

• Operating Temperature: -20°C to +60°C.

• Protection Class: IP40 (when mounted correctly).

• Mounting: Plug-in design using the AGM41 or AGM14 terminal base.

• Operation: Intermittent (the burner must have at least one controlled shutdown every 24 hours).

• Weight: Approximately 0.86 kg.

When looking at the transparent reset button during a lockout, you may see:

• I: Ignition fault (no flame formed during TSA).

• blacktriangle: Extraneous light during pre-purge.

• P: Air pressure failure (specific to LAL 2.25). 

Energy Combustion, Ahmedabad importer and suppliers of SIEMENS make burner sequence controller.

The Siemens LAL 1.25 and LAL 2.25 are oil burner sequence controllers used for the startup and supervision of oil atomizing burners of medium to high capacity.

While they share the same physical footprint and many technical specs, the primary difference lies in air pressure supervision.

1. Comparison of Key Specifications

2. Model Specific DetailsSiemens LAL 1.25

• Application: Used for yellow-flame or blue-flame burners where the air damper position is checked, but the actual air pressure is not monitored by the controller itself.

• Flame Supervision: Supports the QRC1 blue-flame detector, making it a popular choice for "Blue Flame" burners.

• Fault Indication: The lockout indicator is coupled to the sequence switch spindle and shows fault symbols (e.g., failure to ignite, extraneous light).

Siemens LAL 2.25

• Application: Universal oil burner control for multistage or modulating burners.

• Air Pressure Check: This model performs a functional check of the air pressure monitor during startup. If the air pressure switch does not close or opens during operation, the LAL 2.25 will trigger a safety lockout.

• Reliability: Rated for approximately 250,000 startup cycles, ensuring a long service life in industrial environments.

3. General Technical Data

• Operating Temperature: -20°C to +60°C.

• Protection Class: IP40 (when mounted correctly).

• Mounting: Plug-in design using the AGM41 or AGM14 terminal base.

• Operation: Intermittent (the burner must have at least one controlled shutdown every 24 hours).

• Weight: Approximately 0.86 kg.

Understanding the Sequence Symbols

When looking at the transparent reset button during a lockout, you may see:

• I: Ignition fault (no flame formed during TSA).

• blacktriangle: Extraneous light during pre-purge.

• P: Air pressure failure (specific to LAL 2.25). 

Energy Combustion , Ahmedbad importer and supplier of all types and model of Siemens Burner Sequence Controller.

The Siemens LFL series (e.g., LFL1.333, LFL1.635) is an electro-mechanical burner management system designed for gas, oil, or dual-fuel burners of medium to high capacity. It is primarily used for intermittent operation, meaning the burner must have at least one controlled shutdown every 24 hours.

The models differ mainly by their timing sequences (t_1 = pre-purge, TSA = safety time).

•  Voltage: 230V AC +10 -15% or 110V AC variants.

• Frequency: 50  60 Hz}

• Power Consumption: Approx.3.5 VA

• Internal Fuse: 6.3A.

• External Fuse: Max 10 A

• Degree of Protection: IP40 (when mounted).

• Flame Monitoring: * UV Detector: Siemens QRA series (QRA2, QRA4, QRA10).

  • Ionization: Flame rod/probe.

• Operating Temperature: -20°C to +60°C} (Condensation and ice not permitted).

•  Air Damper Control: Includes a functional check of the air damper.It ensures the damper reaches "Open" for purging and "Min" for ignition before the sequence continues.

•  Visual Sequence Indicator: A rotating dial behind the reset button shows the current stage of the program (e.g., Pre-purge, Ignition, Operation)

• Fault Diagnosis: In the event of a lockout, the sequence indicator stops. The symbols on the dial indicate the exact point in time and the cause of the fault:

  • P: Loss of air pressure signal.

  • blacktriangle: Extraneous light or flame signal during pre-purge.

  • 1: Failure to form flame during the first safety time.

The LFL uses the AGM41 plug-in base (24 terminals).

• Terminals 1 & 2: Line and Neutral.

•  Terminal 3: Fault/Alarm output (Remote lockout signal).

• Terminals 6 & 7: Control of the Fan (Combustion air blower).

• Terminals 12 & 14: Air Pressure Switch connection.

• Terminals 16 & 17: Ignition Transformer and Pilot Valve.

•  Terminal 18 & 19: Main Fuel Valves (Stage 1 and 2).

• Terminal 22: Ground for flame detector shielding.

Important Note: If the LFL is used at 60 Hz}, all timing sequences (pre-purge, etc.) will be approximately shorter than the values listed for 50Hz

The Siemens LME21 is a microprocessor-based burner controller designed for the startup and supervision of 1- or 2-stage gas or gas/oil burners.¹ It is the modern replacement for the older LGB21 and LMG21 series.

The model numbers differ based on their pre-purge time and safety time. All models listed below are the "C2" series (230V AC). For 120V AC, the suffix is "C1".

• Mains Voltage: 230V AC +10% / -15% (or 120V AC for C1 models).

•  Power Consumption: ~12 VA.

•  Degree of Protection: IP40 (when mounted).

•  Operating Temperature: -20 to +60

• Flame Supervision:

  • Ionization Probe: 5mu A DC minimum current.

  • UV Detector: Siemens QRA... (requires AGQ3. ancillary unit for mains interface).

• Mounting Base: AGK11 (standard 13-pin).

The LME21 handles the fan motor and air pressure switch, making it a "forced draft" controller.¹²

1. Start-up: Thermostat on Terminal 12 closes.

2. Pre-purge ($t1$): Terminal 3 starts the fan. The controller checks that the Air Pressure Switch (Terminal 7) closes.

3. Pre-ignition ($t3'$): The ignition transformer starts sparking shortly before the valve opens.

4. Safety Time ($TSA$): Fuel Valve 1 (Terminal 5) opens. The probe must see a flame within 3–5 seconds.

5. Stage 2: After a delay,Terminal 6 is energized for the second stage/high fire.

• 2 Flashes: No flame established during safety time.

• 3 Flashes: Air pressure switch fault (either failed to close or is stuck in the closed position).

• 4 Flashes: Extraneous light (flame signal detected before the gas valve opens).

• 7 Flashes: Loss of flame during operation.

• 10 Flashes: Internal error or wiring fault.

The Siemens LME series is a line of microprocessor-based burner controls used for the startup and supervision of single-stage or two-stage gas or gas/oil burners. They are the modern, electronic successors to the older LGB and LMG series.

The LME series is highly modular. The specific model number determines whether it supports a brushless DC (BC) motor, a remote reset, or specific timing.

• Mains Voltage: 230 V AC +10 -15% or 120V AC} variants.

• Frequency: 50-60 Hz.

• Power Consumption: Approx.12VA.

• Flame Monitoring:

  • Ionization probe: For gas burners.

  • UV Detector: QRA2 / QRA4 / QRA10.

  • Optical: QRB (for oil) or QRC (for blue flame).

• Protection Class: IP40 (provided by the mounting environment).

• Operating Temp: -20°C to +60 °C.

• Multicolor LED Indicator: The reset button changes color to communicate status:

  • Green: Operation, flame OK.

  • Yellow: Startup phase/Ignition.

  • Red: Fault/Lockout.

  • Flashing Red: Error code (count the flashes to diagnose).

  • Flashing Orange: Communication mode (using OCI400 interface).

• Air Pressure Supervision: Functional check of the air pressure switch during startup and operation.

• Undervoltage Detection: If the voltage drops below approx. 175V AC, the controller prevents startup or initiates a safety shutdown.

When the LME goes into a red "lockout" state, you can hold the reset button for >3seconds to enter the error code mode. The LED will blink a specific number of times:

The LME uses the standard AGM terminal base (same as the LGB series), 

• Terminal 1: Phase/Live.

• Terminal 2: Neutral.

• Terminal 3: Burner motor.

• Terminal 10: Remote reset. 

Energy Combustion , Ahmedbad importer and supplier of all types and model of Siemens Burner Sequence Controller.

The Siemens LFL series (e.g., LFL1.333, LFL1.635) is an electro-mechanical burner management system designed for gas, oil, or dual-fuel burners of medium to high capacity. It is primarily used for intermittent operation, meaning the burner must have at least one controlled shutdown every 24 hours.

The models differ mainly by their timing sequences (t_1 = pre-purge, TSA = safety time).

•  Voltage: 230V AC +10 -15% or 110V AC variants.

• Frequency: 50  60 Hz}

• Power Consumption: Approx.3.5 VA

• Internal Fuse: 6.3A.

• External Fuse: Max 10 A

• Degree of Protection: IP40 (when mounted).

• Flame Monitoring: * UV Detector: Siemens QRA series (QRA2, QRA4, QRA10).

  • Ionization: Flame rod/probe.

• Operating Temperature: -20°C to +60°C} (Condensation and ice not permitted).

•  Air Damper Control: Includes a functional check of the air damper.It ensures the damper reaches "Open" for purging and "Min" for ignition before the sequence continues.

•  Visual Sequence Indicator: A rotating dial behind the reset button shows the current stage of the program (e.g., Pre-purge, Ignition, Operation)

• Fault Diagnosis: In the event of a lockout, the sequence indicator stops. The symbols on the dial indicate the exact point in time and the cause of the fault:

  • P: Loss of air pressure signal.

  • blacktriangle: Extraneous light or flame signal during pre-purge.

  • 1: Failure to form flame during the first safety time.

The LFL uses the AGM41 plug-in base (24 terminals).

• Terminals 1 & 2: Line and Neutral.

•  Terminal 3: Fault/Alarm output (Remote lockout signal).

• Terminals 6 & 7: Control of the Fan (Combustion air blower).

• Terminals 12 & 14: Air Pressure Switch connection.

• Terminals 16 & 17: Ignition Transformer and Pilot Valve.

•  Terminal 18 & 19: Main Fuel Valves (Stage 1 and 2).

• Terminal 22: Ground for flame detector shielding.

Important Note: If the LFL is used at 60 Hz}, all timing sequences (pre-purge, etc.) will be approximately shorter than the values listed for 50Hz

Energy Combustion, Ahmedabad importer and suppliers of Siemens make burner accessories.

The Siemens PLL52.110A200 is an electronic oxygen trim module used specifically as an extension for the LMV52 burner management system. Its primary role is to provide closed-loop oxygen control by interfacing with the QGO20 oxygen sensor to optimize combustion efficiency.

The "A200" suffix denotes the voltage and parameter set, typically used in European/International markets.

• Combustion Optimization: It constantly monitors the residual oxygen ($O_2$) in the flue gas. If the level deviates from the pre-set curve in the LMV52, the PLL52 sends a correction signal to the air damper or fuel actuator to "trim" the ratio.

• Efficiency Monitoring: By collecting flue gas and combustion air temperatures, the module calculates the real-time combustion efficiency ($\eta$).

• Emission Reduction: Helps maintain the burner at the "excess air" sweet spot, significantly reducing $CO_2$ and $NOx$ emissions while preventing $CO$ formation.

• Cold Start Logic: Can be used to manage flue gas recirculation (FGR) hold functions during the ignition phase.

• Mounting: Usually mounted in the control cabinet alongside the LMV52 base unit. It utilizes a plug-in terminal system for easy replacement.

• CAN Bus: It acts as a node on the LMV system's CAN bus. It must be addressed correctly so the LMV52 recognizes it as the $O_2$ module.

• Flue Gas Collector: Usually used in tandem with the AGO20 flue gas collector, which houses the QGO20 sensor.

The PLL52 typically communicates its status via the AZL52 display unit. Common $O_2$ related faults include:

• Sensor Heating Fault: The QGO20 sensor requires an internal heater to reach operating temperature; the PLL52 monitors this circuit.

• Calibration Errors: If the sensor cannot be calibrated to ambient air ($20.9\%\ O_2$), the module will lock out the trim function for safety.

• CAN Bus Timeout: If communication between the PLL52 and the LMV52 is interrupted, the burner will usually revert to its "Base Curve" (ignoring the trim) or shut down depending on safety settings. 

The Siemens LMO series consists of microprocessor-based oil burner controllers used for the startup and supervision of forced draft oil burners. They are the modern, electronic replacement for the older, purely mechanical LOA series.

The model number typically indicates the burner stage (single or two-stage) and the specific timing/functionality.

• Mains Voltage: $230\text{V AC}$ or $120\text{V AC}$ (Suffix A2 = $230\text{V}$, A1 = $120\text{V}$).

• Frequency: $50\dots 60\text{ Hz}$.

• Power Consumption: Approx. $12\text{ VA}$.

• Flame Monitoring:

  • Optical: QRB series (Yellow flame).

  • Blue Flame: QRC series.

• Protection Class: IP40.

• Operating Temp: $-20\text{°C}$ to $+60\text{°C}$.

• Service Life: $250,000$ start cycles (approx. 10 years).

• Multicolor LED Indicator: The transparent reset button provides visual status:

  • Green: Operation (flame OK).

  • Yellow: Pre-purge/Ignition phase.

  • Red: Fault/Lockout.

  • Flashing Red: Error code diagnostic mode.

• Undervoltage Detection: If the voltage drops below $165\text{V}$ (for $230\text{V}$ models), the controller prevents startup or shuts down safely.

• Oil Pre-heater Support: Includes dedicated terminals to wait for the oil heater to reach the correct temperature before starting the motor.

• Bridging Contact: Integrated contact for oil pre-heaters to ensure they remain hot during operation.

If the controller locks out (Red light), holding the reset button for $>3$ seconds will trigger a blink sequence:

The LMO series was designed with the same footprint as the old LOA series.

• Direct Swap: You can usually replace an LOA24 with an LMO24 using the existing terminal base (AGK11).

• Upgrade Benefit: Switching from LOA to LMO adds undervoltage protection and more precise electronic timing. 

Energy Combustion , Ahmedbad importer and supplier of all types and model of Siemens Burner Sequence Controller.

The Siemens LFL series (e.g., LFL1.333, LFL1.635) is an electro-mechanical burner management system designed for gas, oil, or dual-fuel burners of medium to high capacity. It is primarily used for intermittent operation, meaning the burner must have at least one controlled shutdown every 24 hours.

The models differ mainly by their timing sequences (t_1 = pre-purge, TSA = safety time).

•  Voltage: 230V AC +10 -15% or 110V AC variants.

• Frequency: 50  60 Hz}

• Power Consumption: Approx.3.5 VA

• Internal Fuse: 6.3A.

• External Fuse: Max 10 A

• Degree of Protection: IP40 (when mounted).

• Flame Monitoring: * UV Detector: Siemens QRA series (QRA2, QRA4, QRA10).

  • Ionization: Flame rod/probe.

• Operating Temperature: -20°C to +60°C} (Condensation and ice not permitted).

•  Air Damper Control: Includes a functional check of the air damper.It ensures the damper reaches "Open" for purging and "Min" for ignition before the sequence continues.

•  Visual Sequence Indicator: A rotating dial behind the reset button shows the current stage of the program (e.g., Pre-purge, Ignition, Operation)

• Fault Diagnosis: In the event of a lockout, the sequence indicator stops. The symbols on the dial indicate the exact point in time and the cause of the fault:

  • P: Loss of air pressure signal.

  • blacktriangle: Extraneous light or flame signal during pre-purge.

  • 1: Failure to form flame during the first safety time.

The LFL uses the AGM41 plug-in base (24 terminals).

• Terminals 1 & 2: Line and Neutral.

•  Terminal 3: Fault/Alarm output (Remote lockout signal).

• Terminals 6 & 7: Control of the Fan (Combustion air blower).

• Terminals 12 & 14: Air Pressure Switch connection.

• Terminals 16 & 17: Ignition Transformer and Pilot Valve.

•  Terminal 18 & 19: Main Fuel Valves (Stage 1 and 2).

• Terminal 22: Ground for flame detector shielding.

Important Note: If the LFL is used at 60 Hz}, all timing sequences (pre-purge, etc.) will be approximately shorter than the values listed for 50Hz

The Siemens LME series is a line of microprocessor-based burner controls used for the startup and supervision of single-stage or two-stage gas or gas/oil burners. They are the modern, electronic successors to the older LGB and LMG series.

The LME series is highly modular. The specific model number determines whether it supports a brushless DC (BC) motor, a remote reset, or specific timing.

• Mains Voltage: 230 V AC +10 -15% or 120V AC} variants.

• Frequency: 50-60 Hz.

• Power Consumption: Approx.12VA.

• Flame Monitoring:

  • Ionization probe: For gas burners.

  • UV Detector: QRA2 / QRA4 / QRA10.

  • Optical: QRB (for oil) or QRC (for blue flame).

• Protection Class: IP40 (provided by the mounting environment).

• Operating Temp: -20°C to +60 °C.

• Service Life: Designed for 250,000 start cycles (approx. 10 years of normal operation).

• Multicolor LED Indicator: The reset button changes color to communicate status:

  • Green: Operation, flame OK.

  • Yellow: Startup phase/Ignition.

  • Red: Fault/Lockout.

  • Flashing Red: Error code (count the flashes to diagnose).

  • Flashing Orange: Communication mode (using OCI400 interface).

• Air Pressure Supervision: Functional check of the air pressure switch during startup and operation.

• Undervoltage Detection: If the voltage drops below approx. 175V AC, the controller prevents startup or initiates a safety shutdown.

When the LME goes into a red "lockout" state, you can hold the reset button for >3seconds to enter the error code mode. The LED will blink a specific number of times:

The LME uses the standard AGM terminal base (same as the LGB series), 

• Terminal 1: Phase/Live.

• Terminal 2: Neutral.

• Terminal 3: Burner motor.

• Terminal 10: Remote reset. 

The Siemens LFL series (e.g., LFL1.333, LFL1.635) is an electro-mechanical burner management system designed for gas, oil, or dual-fuel burners of medium to high capacity. It is primarily used for intermittent operation, meaning the burner must have at least one controlled shutdown every 24 hours.

The models differ mainly by their timing sequences (t_1 = pre-purge, TSA = safety time).

•  Voltage: 230V AC +10 -15% or 110V AC variants.

• Frequency: 50  60 Hz}

• Power Consumption: Approx.3.5 VA

• Internal Fuse: 6.3A.

• External Fuse: Max 10 A

• Degree of Protection: IP40 (when mounted).

• Flame Monitoring: * UV Detector: Siemens QRA series (QRA2, QRA4, QRA10).

  • Ionization: Flame rod/probe.

• Operating Temperature: -20°C to +60°C} (Condensation and ice not permitted).

•  Air Damper Control: Includes a functional check of the air damper.It ensures the damper reaches "Open" for purging and "Min" for ignition before the sequence continues.

•  Visual Sequence Indicator: A rotating dial behind the reset button shows the current stage of the program (e.g., Pre-purge, Ignition, Operation)

• Fault Diagnosis: In the event of a lockout, the sequence indicator stops. The symbols on the dial indicate the exact point in time and the cause of the fault:

  • P: Loss of air pressure signal.

  • blacktriangle: Extraneous light or flame signal during pre-purge.

  • 1: Failure to form flame during the first safety time.

The LFL uses the AGM41 plug-in base (24 terminals).

• Terminals 1 & 2: Line and Neutral.

•  Terminal 3: Fault/Alarm output (Remote lockout signal).

• Terminals 6 & 7: Control of the Fan (Combustion air blower).

• Terminals 12 & 14: Air Pressure Switch connection.

• Terminals 16 & 17: Ignition Transformer and Pilot Valve.

•  Terminal 18 & 19: Main Fuel Valves (Stage 1 and 2).

• Terminal 22: Ground for flame detector shielding.

Important Note: If the LFL is used at 60 Hz}, all timing sequences (pre-purge, etc.) will be approximately shorter than the values listed for 50Hz

The Siemens LME44 is a dedicated microprocessor-based burner control for atmospheric gas burners of small to medium capacity. Because atmospheric burners rely on natural draft rather than a mechanical fan, the LME44 sequence is simplified—omitting air pressure supervision and fan motor control.

While the LME series is vast, the LME44 is primarily standardized into one specific timing configuration:

• LME44.190C2: 230V AC version (standard in Europe/Asia).

• LME44.190C1: 120V AC version (standard in North America).

• Mains Voltage: 230V AC +10% / -15% (or 120V AC).

• Mains Frequency: 50...60 Hz $\pm$ 6%.

• Power Consumption: ~12 VA.

• Protection Rating: IP40 (when installed).

• Operating Temperature: $-20$ to $+60$ °C.

• Flame Supervision:

  • Ionization Probe: Minimum signal required $5\ \mu A$ DC.

  • UV Detector: Siemens QRA... (requires an AGQ3... ancillary unit to interface with the LME44).

• Mounting: Uses the AGK11 plug-in base.

Since there is no fan motor, Terminal 3 is unused. The controller focus is purely on the ignition transformer and the gas valves.

The LME44 uses a multicolor LED in the reset button to communicate its current state:

• Steady Yellow: Unit is waiting for a startup signal or is in the pre-purge phase.

• Flashing Green: Ignition is active and the safety time ($TSA$) has started.

• Steady Green: Flame is established; burner is in normal operation.

• Steady Red: Fault/Lockout.

If the burner stops and the button is solid red, press the button for $>3$ seconds to activate the "Blink Code" sequence:

The Siemens LMO series consists of microprocessor-based oil burner controllers used for the startup and supervision of forced draft oil burners. They are the modern, electronic replacement for the older, purely mechanical LOA series.

The model number typically indicates the burner stage (single or two-stage) and the specific timing/functionality.

• Mains Voltage: $230\text{V AC}$ or $120\text{V AC}$ (Suffix A2 = $230\text{V}$, A1 = $120\text{V}$).

• Frequency: $50\dots 60\text{ Hz}$.

• Power Consumption: Approx. $12\text{ VA}$.

• Flame Monitoring:

  • Optical: QRB series (Yellow flame).

  • Blue Flame: QRC series.

• Protection Class: IP40.

• Operating Temp: $-20\text{°C}$ to $+60\text{°C}$.

• Service Life: $250,000$ start cycles (approx. 10 years).

• Multicolor LED Indicator: The transparent reset button provides visual status:

  • Green: Operation (flame OK).

  • Yellow: Pre-purge/Ignition phase.

  • Red: Fault/Lockout.

  • Flashing Red: Error code diagnostic mode.

• Undervoltage Detection: If the voltage drops below $165\text{V}$ (for $230\text{V}$ models), the controller prevents startup or shuts down safely.

• Oil Pre-heater Support: Includes dedicated terminals to wait for the oil heater to reach the correct temperature before starting the motor.

• Bridging Contact: Integrated contact for oil pre-heaters to ensure they remain hot during operation.

If the controller locks out (Red light), holding the reset button for $>3$ seconds will trigger a blink sequence:

The LMO series was designed with the same footprint as the old LOA series.

• Direct Swap: You can usually replace an LOA24 with an LMO24 using the existing terminal base (AGK11).

• Upgrade Benefit: Switching from LOA to LMO adds undervoltage protection and more precise electronic timing. 

The Siemens LME Series is a range of microprocessor-based burner controls designed for the supervision of 1- or 2-stage gas or gas/oil burners. These controllers have largely replaced the older LGB and LMG series and are known for their high reliability and precise digital signal processing.

• Undervoltage Detection: Ensures the burner shuts down if the power supply drops below a safe level.

• Air Pressure Supervision: Provides a functional check of the air pressure switch during startup and operation.

• Multicolor LED Status: The reset button changes color (Green, Yellow, Red) to indicate the current phase of the burner or fault codes.

• Intermittent Operation: Designed for burners that cycle at least once every 24 hours.

• Remote Reset: Features an electrical remote lockout reset facility.

The model number specifies the burner stage and specific timing requirements ($t_1$ = pre-purge time, $TSA$ = ignition safety time).

These specs apply to the core LME1/2/4 series:

• Mains Voltage: 230V AC (Standard) or 120V AC (indicated by C1 suffix).

• Power Consumption: Approx. 12 VA.

• Flame Monitoring:

  • Ionization Probe: Standard for gas flames.

  • UV Detector: Uses QRA... (requires AGQ3... ancillary unit for 230V systems).

  • Blue-Flame Detector: Uses QRC... detectors.

• Degree of Protection: IP40 (when installed correctly).

• Operating Temperature: -20°C to +60°C.

• Designed Lifetime: 250,000 startup cycles (approx. 10 years in normal heating mode).

When the unit enters "Lockout" (Solid Red LED), you can diagnose the issue by the number of pulses:

• 2 Pulses: No flame established at the end of safety time ($TSA$).

• 3 Pulses: Faulty air pressure switch (e.g., switch stuck in the "open" position).

• 4 Pulses: Extraneous light during startup (flame signal detected when it shouldn't be).

• 7 Pulses: Loss of flame during operation.

• 10 Pulses: Wiring error or internal unit failure.

For industrial applications, the LME7 is used. It features:

• Plug-in Program Modules (PME): Allows you to change the burner logic by simply swapping a small module.

• 7-Segment Display: Shows the exact phase of operation or error code digitally.

• Communication: Includes a BC interface for connecting to a PC (via OCI410) or an AZL2 display unit.

The Siemens LMV series (Linkageless Management System) represents the high-end tier of burner control. Unlike traditional controllers (like the LME or LFL), the LMV system replaces mechanical cams and linkages with electronic actuators, allowing for high-precision fuel-to-air ratio control.

The system is primarily divided into two platforms: LMV2/3 (for mid-range burners) and LMV5 (for high-capacity industrial burners).  

Here are the specific models and their technical details.

The model number identifies the burner complexity and fuel type it can handle.

• Supply Voltage: 120V AC or 230 V AC (Suffix A1 = 120V, A2 = 230V.

• Frequency: 50- 60Hz}.

• Power Consumption: < 30VA}.

• Safety Level: SIL3 rated (highest safety standard for burners).

• Communication: Internal CAN bus for actuators; Modbus RTU for BMS integration.

• Ambient Temp: -20°C to +60°C.

• Mounting: DIN rail or screw mounting inside a control cabinet (IP00 rating).

The LMV base unit cannot function without these peripheral devices:

These are the screens used to program the fuel/air curves.

• AZL21: Small, icon-based display for LMV2/3.

• AZL23: Text-based display for LMV2/3.

• AZL52: High-resolution text display for LMV5 (supports graphics and trend logs).

These replace the mechanical linkages and rods.

• SQM33: Compact stepper motor (up to 3 Nm} torque).

• SQM85/91: Large industrial actuators (up to 60{ Nm} torque).

• Precision: 0.1° resolution for extremely tight combustion control.

• QRA / ION: Flame sensors (UV or Ionization).

• PLL52: The O2 Trim module (only for LMV52).

• Curve Points: Allows for up to 15 individual points to be set for the air/fuel ratio across the burner's firing range (Low fire to High fire).

• VFD Control: The LMV37 and LMV5 series can control the combustion air fan speed via a 4- 20mA or 0-10textVsignal to save electricity.

When ordering, pay attention to the end of the model string:

• .200: Standard version.

• .300: Version with extended functions (like FGR - Flue Gas Recirculation).

• A2: 230V operation. 

The Siemens LFL series (e.g., LFL1.333, LFL1.635) is an electro-mechanical burner management system designed for gas, oil, or dual-fuel burners of medium to high capacity. It is primarily used for intermittent operation, meaning the burner must have at least one controlled shutdown every 24 hours.

The models differ mainly by their timing sequences (t_1 = pre-purge, TSA = safety time).

•  Voltage: 230V AC +10 -15% or 110V AC variants.

• Frequency: 50  60 Hz}

• Power Consumption: Approx.3.5 VA

• Internal Fuse: 6.3A.

• External Fuse: Max 10 A

• Degree of Protection: IP40 (when mounted).

• Flame Monitoring: * UV Detector: Siemens QRA series (QRA2, QRA4, QRA10).

  • Ionization: Flame rod/probe.

• Operating Temperature: -20°C to +60°C} (Condensation and ice not permitted).

•  Air Damper Control: Includes a functional check of the air damper.It ensures the damper reaches "Open" for purging and "Min" for ignition before the sequence continues.

•  Visual Sequence Indicator: A rotating dial behind the reset button shows the current stage of the program (e.g., Pre-purge, Ignition, Operation)

• Fault Diagnosis: In the event of a lockout, the sequence indicator stops. The symbols on the dial indicate the exact point in time and the cause of the fault:

  • P: Loss of air pressure signal.

  • blacktriangle: Extraneous light or flame signal during pre-purge.

  • 1: Failure to form flame during the first safety time.

The LFL uses the AGM41 plug-in base (24 terminals).

• Terminals 1 & 2: Line and Neutral.

•  Terminal 3: Fault/Alarm output (Remote lockout signal).

• Terminals 6 & 7: Control of the Fan (Combustion air blower).

• Terminals 12 & 14: Air Pressure Switch connection.

• Terminals 16 & 17: Ignition Transformer and Pilot Valve.

•  Terminal 18 & 19: Main Fuel Valves (Stage 1 and 2).

• Terminal 22: Ground for flame detector shielding.

Important Note: If the LFL is used at 60 Hz}, all timing sequences (pre-purge, etc.) will be approximately shorter than the values listed for 50Hz

The Siemens LMO series consists of microprocessor-based oil burner controllers used for the startup and supervision of forced draft oil burners. They are the modern, electronic replacement for the older, purely mechanical LOA series.

The model number typically indicates the burner stage (single or two-stage) and the specific timing/functionality.

• Mains Voltage: $230\text{V AC}$ or $120\text{V AC}$ (Suffix A2 = $230\text{V}$, A1 = $120\text{V}$).

• Frequency: $50\dots 60\text{ Hz}$.

• Power Consumption: Approx. $12\text{ VA}$.

• Flame Monitoring:

  • Optical: QRB series (Yellow flame).

  • Blue Flame: QRC series.

• Protection Class: IP40.

• Operating Temp: $-20\text{°C}$ to $+60\text{°C}$.

• Service Life: $250,000$ start cycles (approx. 10 years).

• Multicolor LED Indicator: The transparent reset button provides visual status:

  • Green: Operation (flame OK).

  • Yellow: Pre-purge/Ignition phase.

  • Red: Fault/Lockout.

  • Flashing Red: Error code diagnostic mode.

• Undervoltage Detection: If the voltage drops below $165\text{V}$ (for $230\text{V}$ models), the controller prevents startup or shuts down safely.

• Oil Pre-heater Support: Includes dedicated terminals to wait for the oil heater to reach the correct temperature before starting the motor.

• Bridging Contact: Integrated contact for oil pre-heaters to ensure they remain hot during operation.

If the controller locks out (Red light), holding the reset button for $>3$ seconds will trigger a blink sequence:

The LMO series was designed with the same footprint as the old LOA series.

• Direct Swap: You can usually replace an LOA24 with an LMO24 using the existing terminal base (AGK11).

• Upgrade Benefit: Switching from LOA to LMO adds undervoltage protection and more precise electronic timing. 

The Siemens LFL series (e.g., LFL1.333, LFL1.635) is an electro-mechanical burner management system designed for gas, oil, or dual-fuel burners of medium to high capacity. It is primarily used for intermittent operation, meaning the burner must have at least one controlled shutdown every 24 hours.

The models differ mainly by their timing sequences (t_1 = pre-purge, TSA = safety time).

•  Voltage: 230V AC +10 -15% or 110V AC variants.

• Frequency: 50  60 Hz}

• Power Consumption: Approx.3.5 VA

• Internal Fuse: 6.3A.

• External Fuse: Max 10 A

• Degree of Protection: IP40 (when mounted).

• Flame Monitoring: * UV Detector: Siemens QRA series (QRA2, QRA4, QRA10).

  • Ionization: Flame rod/probe.

• Operating Temperature: -20°C to +60°C} (Condensation and ice not permitted).

•  Air Damper Control: Includes a functional check of the air damper.It ensures the damper reaches "Open" for purging and "Min" for ignition before the sequence continues.

•  Visual Sequence Indicator: A rotating dial behind the reset button shows the current stage of the program (e.g., Pre-purge, Ignition, Operation)

• Fault Diagnosis: In the event of a lockout, the sequence indicator stops. The symbols on the dial indicate the exact point in time and the cause of the fault:

  • P: Loss of air pressure signal.

  • blacktriangle: Extraneous light or flame signal during pre-purge.

  • 1: Failure to form flame during the first safety time.

The LFL uses the AGM41 plug-in base (24 terminals).

• Terminals 1 & 2: Line and Neutral.

•  Terminal 3: Fault/Alarm output (Remote lockout signal).

• Terminals 6 & 7: Control of the Fan (Combustion air blower).

• Terminals 12 & 14: Air Pressure Switch connection.

• Terminals 16 & 17: Ignition Transformer and Pilot Valve.

•  Terminal 18 & 19: Main Fuel Valves (Stage 1 and 2).

• Terminal 22: Ground for flame detector shielding.

Important Note: If the LFL is used at 60 Hz}, all timing sequences (pre-purge, etc.) will be approximately shorter than the values listed for 50Hz

The Siemens LME21 is a microprocessor-based burner controller designed for the startup and supervision of 1- or 2-stage gas or gas/oil burners. It is the modern replacement for the older LGB21 and LMG21 series.

The model numbers differ based on their pre-purge time (t1) and safety time (TSA). All models listed below are the "C2" series (230V AC). For 120V AC, the suffix is "C1".

• Mains Voltage: 230V AC +10% / -15% (or 120V AC for C1 models).

•  Power Consumption: ~12 VA.

• Degree of Protection: IP40 (when mounted).

• Operating Temperature: 20 to +60 °C.

• Flame Supervision:

  • Ionization Probe: $5\ \mu A$ DC minimum current.

  • UV Detector: Siemens QRA... (requires AGQ3...¹¹ ancillary unit for mains interface).

• Mounting Base: AGK11 (standard 13-pin).

1. Start-up: Thermostat on Terminal 12 closes.

2. Pre-purge (t1): Terminal 3 starts the fan. The controller checks that the Air Pressure Switch (Terminal 7) closes.

3. Pre-ignition (t3): The ignition transformer starts sparking shortly before the valve opens.

4. Safety Time (TSA): Fuel Valve 1 (Terminal 5) opens. The probe must see a flame within 3–5 seconds.

5. Stage 2: After a delay (t4), Terminal 6 is energized for the second stage/high fire.

• 2 Flashes: No flame established during safety time.

• 3 Flashes: Air pressure switch fault (either failed to close or is stuck in the closed position).

• 4 Flashes: Extraneous light (flame signal detected before the gas valve opens). 

• 7 Flashes: Loss of flame during operation.

• 10 Flashes: Internal error or wiring fault.

The Siemens LFL series (e.g., LFL1.333, LFL1.635) is an electro-mechanical burner management system designed for gas, oil, or dual-fuel burners of medium to high capacity. It is primarily used for intermittent operation, meaning the burner must have at least one controlled shutdown every 24 hours.

The models differ mainly by their timing sequences (t_1 = pre-purge, TSA = safety time).

•  Voltage: 230V AC +10 -15% or 110V AC variants.

• Frequency: 50  60 Hz}

• Power Consumption: Approx.3.5 VA

• Internal Fuse: 6.3A.

• External Fuse: Max 10 A

• Degree of Protection: IP40 (when mounted).

• Flame Monitoring: * UV Detector: Siemens QRA series (QRA2, QRA4, QRA10).

  • Ionization: Flame rod/probe.

• Operating Temperature: -20°C to +60°C} (Condensation and ice not permitted).

•  Air Damper Control: Includes a functional check of the air damper.It ensures the damper reaches "Open" for purging and "Min" for ignition before the sequence continues.

•  Visual Sequence Indicator: A rotating dial behind the reset button shows the current stage of the program (e.g., Pre-purge, Ignition, Operation)

• Fault Diagnosis: In the event of a lockout, the sequence indicator stops. The symbols on the dial indicate the exact point in time and the cause of the fault:

  • P: Loss of air pressure signal.

  • blacktriangle: Extraneous light or flame signal during pre-purge.

  • 1: Failure to form flame during the first safety time.

The LFL uses the AGM41 plug-in base (24 terminals).

• Terminals 1 & 2: Line and Neutral.

•  Terminal 3: Fault/Alarm output (Remote lockout signal).

• Terminals 6 & 7: Control of the Fan (Combustion air blower).

• Terminals 12 & 14: Air Pressure Switch connection.

• Terminals 16 & 17: Ignition Transformer and Pilot Valve.

•  Terminal 18 & 19: Main Fuel Valves (Stage 1 and 2).

• Terminal 22: Ground for flame detector shielding.

Important Note: If the LFL is used at 60 Hz}, all timing sequences (pre-purge, etc.) will be approximately shorter than the values listed for 50Hz

The Siemens AZL series consists of display and operating units designed to interface with the LMV (Linkageless Management) and LME7 burner management systems. They serve as the primary window into the burner’s logic, allowing for commissioning, parameter adjustment, and real-time monitoring.

• Operating Voltage: DC $12\text{V}$ (Powered via the LMV base unit).

• Communication: Serial interface (RJ11 or specialized cable).

• Display: 8-digit LCD with backlighting.

• Ambient Temp: $-20\text{°C}$ to $+60\text{°C}$.

• Protection Class: IP40 (Front side IP54 when mounted with a sealing gasket).

• Functionality: * Set-point adjustment.

  • Error code display and reset.

  • Phase position monitoring.

• Operating Voltage: DC $24\text{V}$ (Powered via the LMV5 base unit).

• Communication: CAN bus interface.

• Display: Monochrome backlit graphic display ($160 \times 80$ pixels).

• Memory: Internal memory for parameter backup and data logging.

• Ambient Temp: $-20\text{°C}$ to $+50\text{°C}$ (Strictly monitored).

• Functionality: * Visualization of the fuel/air ratio curves (V-points).

  • Efficiency calculations ($\eta$).

  • $O_2$ trim monitoring and calibration.

  • Operating hour counters and start counters.

1. Commissioning Tool: The AZL is used to "teach" the LMV system the ratio curves by driving the SQM actuators to specific positions and storing them.

2. Diagnostics: Instead of simple blink codes, the AZL provides specific fault codes (e.g., Fault 04: No flame signal) and the exact phase of the startup when the fault occurred.

3. Parameterization: It allows technicians to adjust timings (pre-purge, safety times) and safety limits without needing a PC.

4. Remote Mounting: AZLs can be mounted on the front of the control cabinet door using specialized mounting frames, keeping the high-voltage LMV base unit safe inside the panel.

• Cable Length: Standard cables are $1.2\text{m}$ to $3\text{m}$, but CAN bus extensions for the AZL52 can reach up to $100\text{m}$ with proper shielding.

• Mounting Frames: AGG3.131 (for AZL2x) or AGG3.150 (for AZL5x) are used to secure the displays to the panel door.

The Siemens LFE10 is a specialized flame supervision unit (flame amplifier) used for the supervision of gas and oil flames. Unlike the LFL or LME series, the LFE10 is not a full sequence controller; it is a dedicated flame relay that monitors the presence of a flame and provides a signal to a master controller or a PLC.

• Dual Monitoring: It can be used for either ionization probes (gas) or UV detectors (QRA series for gas/oil).

• Self-Checking: The unit is designed for continuous operation or intermittent operation, depending on the flame sensor used.

• Signal Output: It provides a potential-free (dry) contact that closes when a flame is detected.

• Indication: Features a signal lamp (LED) on the front to show the flame status:

  • Off: No flame or unit powered off.

  • On (Green): Flame detected and signal is stable.

The LFE10 typically plugs into an AGM13.1 terminal base.

• Terminals 1 & 2: Power supply (Line and Neutral).

• Terminal 3: Common for the flame relay.

• Terminal 4: Normally Open (NO) contact (Closes on flame detection).

• Terminal 5: Normally Closed (NC) contact (Opens on flame detection).

• Terminal 11 / 12: Connection for the UV detector (QRA) or Ionization probe.

Depending on the sensor, the behavior of the LFE10 changes slightly:

1. Ionization: Used for gas burners. It detects the rectification of the AC current by the flame.

2. UV Detector (QRA): For gas or oil. The LFE10 provides the necessary voltage to the UV tube.

   • Note: If using a QRA sensor for continuous operation (burning for more than 24 hours without stop), a specialized self-checking sensor like the QRA5 is usually required along with a different control logic.

The LFE10 is frequently used in:

• Multi-burner systems: Where one central PLC controls the sequence of 10 different burners, each having its own LFE10 for individual flame supervision.

• Industrial Kilns/Furnaces: Where simple "Flame/No Flame" logic is required for safety interlocks.

• The Siemens LGB series is a range of electromechanical burner controllers designed for the supervision of small to medium-capacity gas or gas/oil burners. While many modern systems have transitioned to the digital LME series, the LGB remains a staple in existing boiler plants, industrial ovens, and atmospheric burners.

  1. Key Technical Specifications

  The LGB operates using a motorized sequence switch that physically rotates to open and close contacts at specific intervals.

  Parameter	Specification
  Mains Voltage	$230\text{V AC}$ or $100\dots 110\text{V AC}$
  Frequency	$50\dots 60\text{ Hz}$
  Power Consumption	Approx. $3\text{ VA}$
  Flame Monitoring	Ionization probe or UV (with AGQ adapter)
  Safety Level	Designed for intermittent operation (1 shutdown per 24h)
  Operating Temp	$-20\text{°C}$ to $+60\text{°C}$
  Protection Class	IP40

  2. Popular LGB Models & Timing

  The model number determines the pre-purge time ($t_1$) and the safety time ($TSA$).

  • LGB21.330: Standard for 2-stage gas burners. ($t_1 = 30\text{s}$, $TSA = 3\text{s}$)

  • LGB21.130: Fast-start version for gas burners. ($t_1 = 7\text{s}$, $TSA = 3\text{s}$)

  • LGB22.330: Designed for gas/oil dual fuel or burners with oil pre-heaters. ($t_1 = 30\text{s}$, $TSA = 3\text{s}$)

  • LGB41.255: Specifically for atmospheric gas burners. ($t_1 = 25\text{s}$, $TSA = 5\text{s}$)

  3. Visual Fault Diagnosis

  Because the LGB is electromechanical, the cause of a lockout is indicated by the position of the sequence indicator (the small dial visible behind the reset button).

  Symbol	Meaning	Potential Cause
  No Symbol	Startup Interrupted	No "Start" signal from thermostat or limit controller.
  $P$	Air Pressure Failure	Air switch didn't close, fan motor failed, or blocked intake.
  $\blacktriangle$	Extraneous Light	Flame signal detected during pre-purge (leaking valve).
  $1$	Ignition Failure	No flame detected by the end of safety time ($TSA$).

  4. Flame Monitoring Methods

  1. Ionization Probe: The most common method for gas. It measures the "rectification" effect of the flame.

  2. UV Detector (QRA): Used for larger burners or dual fuel. Note that most LGB units require an AGQ1 or AGQ2 ancillary module to interface with a UV sensor.

  5. Retrofitting Note

  If you are replacing an old LGB unit, the Siemens LME is the direct digital successor.

  • LGB21 is usually replaced by LME21.

  • LGB22 is usually replaced by LME22.

  • The terminal base (AGM) is compatible, but you must verify that the safety time ($TSA$) of the new LME matches the original LGB to comply with local safety regulations.

The Siemens LGB series consists of compact, electromechanical burner controllers used for the startup and supervision of small to medium-capacity gas or gas/oil burners. While many are being phased out in favor of the electronic LME series, they remain widely used in existing boiler plants and industrial ovens.

The LGB series is categorized by its timing (pre-purge and safety times) and whether it supports a brushless DC motor or remote reset.

• Mains Voltage: $230\text{V AC}$ ($+10\% / -15\%$) or $100\dots 110\text{V AC}$ variants.

• Frequency: $50\dots 60\text{ Hz}$.

• Power Consumption: Approx. $3\text{ VA}$.

• Flame Monitoring:

  • Ionization probe: Standard for most gas applications.

  • UV Detector: QRA2 / QRA4 / QRA10 (requires an AGQ1 or AGQ2 adapter module for certain LGB models).

• Protection Class: IP40 (when mounted).

• Operating Temp: $-20\text{°C}$ to $+60\text{°C}$.

• Housing: Robust plastic, plug-in design.

• Air Pressure Supervision: Monitors the air pressure switch (LDW) during start-up and operation. If the switch fails to close or opens during the cycle, the controller initiates a safety lockout.

• Intermittent Operation: Designed for systems where the burner shuts down at least once every 24 hours.

• Compatibility: Uses the standard AGM terminal base, which is physically identical to the newer LME series, making upgrades straightforward.

• Internal Fuse: Protects the internal contacts against overload.

Since the LGB is electromechanical, it uses a sequence switch. During a lockout, the position of the indicator behind the reset button reveals the cause:

• No Symbol: Failure to start (e.g., no "start" signal or faulty thermostat).

• $P$: Lockout because the air pressure signal is missing.

• $\blacktriangle$: Lockout due to a flame signal (extraneous light) being present during the pre-purge phase.

• $1$: Lockout because no flame was detected at the end of the safety time ($TSA$).

The LGB typically utilizes a 12-terminal or 24-terminal base:

• Terminal 1: Phase/Live ($L$).

• Terminal 2: Neutral ($N$).

• Terminal 3: Fan motor.

• Terminal 4: Air pressure switch.

• Terminal 7: Ignition transformer.

• Terminal 11/12: Fuel valves.

Note: When replacing an LGB with a newer LME model, the wiring is usually a 1-to-1 match, but you must ensure the safety time ($TSA$) of the new controller matches the requirements of your specific burner. 

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The Siemens LAL 1.25 and LAL 2.25 are oil burner sequence controllers used for the startup and supervision of oil atomizing burners of medium to high capacity.

While they share the same physical footprint and many technical specs, the primary difference lies in air pressure supervision.

• Application: Used for yellow-flame or blue-flame burners where the air damper position is checked, but the actual air pressure is not monitored by the controller itself.

• Flame Supervision: Supports the QRC1 blue-flame detector, making it a popular choice for "Blue Flame" burners.

• Fault Indication: The lockout indicator is coupled to the sequence switch spindle and shows fault symbols (e.g., failure to ignite, extraneous light).

• Application: Universal oil burner control for multistage or modulating burners.

• Air Pressure Check: This model performs a functional check of the air pressure monitor during startup. If the air pressure switch does not close or opens during operation, the LAL 2.25 will trigger a safety lockout.

• Reliability: Rated for approximately 250,000 startup cycles, ensuring a long service life in industrial environments.

• Operating Temperature: -20°C to +60°C.

• Protection Class: IP40 (when mounted correctly).

• Mounting: Plug-in design using the AGM41 or AGM14 terminal base.

• Operation: Intermittent (the burner must have at least one controlled shutdown every 24 hours).

• Weight: Approximately 0.86 kg.

When looking at the transparent reset button during a lockout, you may see:

• I: Ignition fault (no flame formed during TSA).

• blacktriangle: Extraneous light during pre-purge.

• P: Air pressure failure (specific to LAL 2.25). 

The Siemens LME21 and LME22 are both microprocessor-based burner controllers used for the startup and supervision of 1- or 2-stage gas or gas/oil burners. While they look identical and share the same base, they differ significantly in how they handle actuator control for high/low fire.

• LME21: Designed for 2-stage burners without integrated actuator control. It switches between stages but does not manage the timing of an air damper motor.

• LME22: Designed for 2-stage burners with integrated actuator control. It includes specific "running times" in its sequence to allow an air damper (actuator) to move between the "low fire" and "high fire" positions.

These specifications apply to both the LME21 and LME22 series:

The model number determines the specific pre-purge and safety time.

Both use the same 13-pin plug-in base (AGK11), but their outputs vary:

• Terminal 1: Phase (L)

• Terminal 2: Neutral (N)

• Terminal 3: Burner Motor / Air Pressure Switch (Input/Output)

• Terminal 4: Ignition Transformer

• Terminal 5: Fuel Valve 1 (Stage 1)

• Terminal 6: LME21: Fuel Valve 2 (Stage 2) | LME22: Actuator control signal

• Terminal 10: Reset button / Fault signal output

• Terminal 12: Safety Loop / Thermostat

The reset button serves as a visual indicator:

• Flashing Yellow: Pre-purge or waiting for air pressure signal.

• Flashing Green: Safety time / Flame established.

• Solid Green: Burner in operation (normal).

• Solid Red: Lockout / Fault. (Refer to the "Pulse Codes" in the previous message to diagnose the number of red flashes).

Important Note: When replacing an older LGB or LMG series controller with an LME, you must ensure the base wiring matches.

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