Siemens LGB Series Gas Burner Controllers
Product Description
Siemens Burner Controllers LGB Series
Siemens LGB Series comprises automatic gas burner controls for the startup, ignition and flame supervision of small- to medium-capacity burners, typically up to 350 kW.
The controllers operate with single-stage or two-stage gas burners in intermittent operation. Depending on the model, flame detection uses an ionization probe, QRC1 blue-flame detector or QRA UV detector with an AGQ1.xA27 ancillary unit.
Key Features
- Automatic gas burner startup and ignition control
- Single-stage and two-stage operation according to model
- Compatible ionization, QRC1 or QRA flame supervision
- Integrated undervoltage detection
- Air pressure switch supervision on applicable models
- Safety lockout on specified burner faults
- Electrical remote reset facility
- Plug-in housing for servicing and replacement
Available LGB Series Models
- LGB21: Single- or two-stage forced-draft gas burners; prepurge using low-flame air volume.
- LGB22: Forced-draft gas burners with air damper control and prepurge using nominal-load air volume.
- LGB32: Forced-draft gas burners using the QRC1 blue-flame detector.
- LGB41: Atmospheric gas burners, with or without a fan according to configuration.
Compatible Flame Supervision
- Ionization Probe: Used on compatible LGB21, LGB22 and LGB41 configurations.
- QRA UV Detector: Requires the appropriate AGQ1.xA27 ancillary unit on compatible LGB2 or LGB4 controllers.
- QRC1 Blue-Flame Detector: Used with LGB32.
Industrial Applications
- Existing industrial gas-fired boilers
- Gas-fired heating equipment
- Forced-draft and atmospheric gas burner maintenance
- Replacement of compatible legacy burner controllers
Model Selection and Replacement
Siemens states that LGB burner controls should not be used for new designs and identifies LME1, LME2, LME3 and LME4 as alternatives for new applications.
Before replacing an existing controller, verify its full part number, supply voltage, flame detector, startup program, safety time, air pressure switch configuration, plug-in base and wiring. Legacy LFI7 or LFM1 replacement may require a specified adapter.
Safety Note: Installation, replacement and commissioning must be carried out by qualified personnel according to Siemens documentation and applicable regulations.
Specifications
Siemens LGB Series Technical Specifications
| Brand | Siemens |
|---|---|
| Product Type | Gas Burner Controls |
| Series | LGB Series |
| Models | LGB21 / LGB22 / LGB32 / LGB41 |
| Burner Capacity | Typically up to 350 kW |
| Fuel Type | Gas |
| Operating Mode | Intermittent Operation |
| Control Stages | Single-stage / Two-stage, depending on model |
| Supply Voltage | LGB2 / LGB4: AC 220 V -15% to AC 240 V +10%; LGB32: AC 230 V -15% / +10%; AC 100-110 V versions subject to model |
| Mains Frequency | 50-60 Hz ±6% |
| Power Consumption | Approx. 3 VA |
| External Primary Fuse | Max. 6.3 A (Slow) |
| Input Current at Terminal 12 | Max. 5 A |
| Flame Supervision | Ionization Probe / QRC1 / QRA with AGQ1.xA27, model-dependent |
| Air Pressure Supervision | Available on applicable forced-draft models |
| Undervoltage Detection | Integrated |
| Remote Reset | Supported |
| Safety Lockout | Supported |
| Operating Temperature | -20 to +60 °C |
| Relative Humidity | <95% RH, non-condensing |
| Degree of Protection | IP40 when correctly installed, excluding connection area |
| Safety Class | Class I with plug-in base |
| Weight | Approx. 230 g |
| Mounting Position | Any orientation permitted |
| Installation Altitude | Max. 2,000 m above sea level |
| Plug-in Base | Compatible AGK11 Series |
| Designed Lifetime | 250,000 burner startup cycles or approximately 10 years under specified conditions |
| Reference Standards | DIN EN 298 / DIN EN 60730-2-5; EN 676 for applicable burner installations |
| Reference Document | Siemens CC1N7435en (09.05.2018) |
LGB Series Model Comparison
| Model | Application | Flame Detector |
|---|---|---|
| LGB21 | Single-/two-stage forced-draft burners | Ionization / QRA with AGQ1.xA27 |
| LGB22 | Forced-draft burners with air damper control | Ionization / QRA with AGQ1.xA27 |
| LGB32 | Forced-draft burners | QRC1 Blue-Flame Detector |
| LGB41 | Atmospheric gas burners | Ionization / QRA with AGQ1.xA27 |
Technical Note: Siemens specifies that LGB controllers should not be used for new designs. Safety time (TSA), prepurge sequence, voltage and detector compatibility depend on the complete model code. Check the existing wiring and compatible base before replacement. Source: Siemens CC1N7435en.
Product Specifications
Siemens LGB Series Technical Specifications
| Brand | Siemens |
|---|---|
| Product Type | Gas Burner Controls |
| Series | LGB Series |
| Models | LGB21 / LGB22 / LGB32 / LGB41 |
| Burner Capacity | Typically up to 350 kW |
| Fuel Type | Gas |
| Operating Mode | Intermittent Operation |
| Control Stages | Single-stage / Two-stage, depending on model |
| Supply Voltage | LGB2 / LGB4: AC 220 V -15% to AC 240 V +10%; LGB32: AC 230 V -15% / +10%; AC 100-110 V versions subject to model |
| Mains Frequency | 50-60 Hz ±6% |
| Power Consumption | Approx. 3 VA |
| External Primary Fuse | Max. 6.3 A (Slow) |
| Input Current at Terminal 12 | Max. 5 A |
| Flame Supervision | Ionization Probe / QRC1 / QRA with AGQ1.xA27, model-dependent |
| Air Pressure Supervision | Available on applicable forced-draft models |
| Undervoltage Detection | Integrated |
| Remote Reset | Supported |
| Safety Lockout | Supported |
| Operating Temperature | -20 to +60 °C |
| Relative Humidity | <95% RH, non-condensing |
| Degree of Protection | IP40 when correctly installed, excluding connection area |
| Safety Class | Class I with plug-in base |
| Weight | Approx. 230 g |
| Mounting Position | Any orientation permitted |
| Installation Altitude | Max. 2,000 m above sea level |
| Plug-in Base | Compatible AGK11 Series |
| Designed Lifetime | 250,000 burner startup cycles or approximately 10 years under specified conditions |
| Reference Standards | DIN EN 298 / DIN EN 60730-2-5; EN 676 for applicable burner installations |
| Reference Document | Siemens CC1N7435en (09.05.2018) |
LGB Series Model Comparison
| Model | Application | Flame Detector |
|---|---|---|
| LGB21 | Single-/two-stage forced-draft burners | Ionization / QRA with AGQ1.xA27 |
| LGB22 | Forced-draft burners with air damper control | Ionization / QRA with AGQ1.xA27 |
| LGB32 | Forced-draft burners | QRC1 Blue-Flame Detector |
| LGB41 | Atmospheric gas burners | Ionization / QRA with AGQ1.xA27 |
Technical Note: Siemens specifies that LGB controllers should not be used for new designs. Safety time (TSA), prepurge sequence, voltage and detector compatibility depend on the complete model code. Check the existing wiring and compatible base before replacement. Source: Siemens CC1N7435en.
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