Siemens LGA Series Gas Burner Controllers
Product Description
Siemens Burner Controllers LGA Series
Siemens LGA Series are automatic gas burner controls designed for startup, ignition sequencing and flame supervision of small- to medium-capacity atmospheric gas burners operating intermittently.
The controllers manage the ignition transformer and gas valve sequence while supervising the flame through an ionization probe. The series uses an electromechanical thermal sequencing mechanism with electronic flame supervision.
Key Features
- Automatic burner startup and ignition sequencing
- Ionization probe flame supervision
- Two gas valve control outputs: BV1 and BV2
- Safety lockout for ignition failure and abnormal flame signals
- Auxiliary fan and air pressure switch connections on selected models
- Model-dependent undervoltage detection
- Integrated lockout indication lamp and manual reset button
- Plug-in design for servicing and replacement
- Replacement of compatible LFI7 and LFI5 predecessors using specified adapters
Operating Principle
Following a startup command, the controller initiates its model-specific ignition program. It energizes the ignition equipment and releases the appropriate gas valves while monitoring the flame signal.
When a valid ionization signal is detected, burner operation continues according to the control sequence. If flame establishment fails within the specified safety time (TSA), the controller initiates safety lockout.
Available Series
- LGA41: Atmospheric gas burner control without auxiliary fan connection. The available variants have different safety times and undervoltage functions.
- LGA52: Gas burner control family; LGA52.171B27 supports auxiliary fan and air pressure switch connections, while LGA52.150B17/B27 do not.
- LGA63: LGA63.191A27 supports auxiliary fan and air pressure supervision, undervoltage detection and enhanced flame signal sensitivity.
Typical Applications
- Existing small and medium-capacity gas burners
- Gas-fired industrial heating equipment
- Intermittently operated gas combustion systems
- Maintenance and replacement of compatible legacy burner controllers
- Air heating equipment on specified variants
Model Selection and Replacement
Siemens specifies that LGA burner controls should not be used for new designs and recommends considering LME1, LME2, LME3 or LME4 for new applications.
Before replacement, verify the full model number, voltage, ignition safety time, wiring, flame detector, fan and air pressure switch configuration, and compatible plug-in base.
Safety Notice: Installation and commissioning must be carried out by qualified personnel following Siemens technical documentation and applicable safety regulations.
Specifications
Siemens LGA Series Technical Specifications
| Specification | Technical Data |
|---|---|
| Brand | Siemens |
| Product Series | LGA Series |
| Product Type | Gas Burner Controls |
| Application | Small to medium-capacity atmospheric gas burners, intermittent operation |
| Supply Voltage | AC 220-240 V or AC 100-110 V, model-dependent; LGA63: AC 230 V ±10% |
| Mains Frequency | 50-60 Hz ±6% |
| Power Consumption | 3 VA |
| Input Current at Terminal 1 | Max. 5 A |
| Flame Detection | Ionization Probe |
| Minimum Detector Current | 5 µA |
| Maximum Possible Detector Current | 100 µA |
| Detector Cable Length | Max. 20 m (separate cable) |
| Minimum Insulation Resistance | 50 MΩ |
| Gas Valve Outputs | 2 (BV1 and BV2) |
| Auxiliary Fan / Air Pressure Switch | LGA52.171B27 / LGA63.191A27 |
| Undervoltage Detection | Model-dependent; not provided on LGA41.153A27 |
| Degree of Protection | IP40 when integrated correctly |
| Operating Temperature | 0 to +60 °C; LGA41.173A27 / LGA52.171B27: -20 to +60 °C |
| Relative Humidity | <95% RH |
| Weight | Approx. 180 g |
| Mounting Type | Plug-in |
| Compatible Plug-in Base | AGK11 Series (accessory) |
| Reference Document | Siemens CC1N7418en (21.06.2016) |
Model Variants and Ignition Safety Time
| Model | Supply Voltage | Safety Time (TSA) |
|---|---|---|
| LGA41.153A27 | AC 220-240 V | 5 s |
| LGA41.173A27 | AC 220-240 V | 10 s |
| LGA52.150B27 | AC 220-240 V | 5 s |
| LGA52.150B17 | AC 100-110 V | 5 s |
| LGA52.171B27 | AC 220-240 V | 4.5-7.5 s |
| LGA63.191A27 | AC 230 V | 10 s |
Timing Note: Values apply at AC 220 V or AC 110 V according to model. Siemens specifies a timing multiplier of 0.7 when operating at AC 240 V. Check maximum permitted safety time separately from the nominal TSA values.
Selection Note: LGA is not recommended for new designs. Check the complete model number, operating sequence and installation conditions before replacing an existing controller.
Product Specifications
Siemens LGA Series Technical Specifications
| Specification | Technical Data |
|---|---|
| Brand | Siemens |
| Product Series | LGA Series |
| Product Type | Gas Burner Controls |
| Application | Small to medium-capacity atmospheric gas burners, intermittent operation |
| Supply Voltage | AC 220-240 V or AC 100-110 V, model-dependent; LGA63: AC 230 V ±10% |
| Mains Frequency | 50-60 Hz ±6% |
| Power Consumption | 3 VA |
| Input Current at Terminal 1 | Max. 5 A |
| Flame Detection | Ionization Probe |
| Minimum Detector Current | 5 µA |
| Maximum Possible Detector Current | 100 µA |
| Detector Cable Length | Max. 20 m (separate cable) |
| Minimum Insulation Resistance | 50 MΩ |
| Gas Valve Outputs | 2 (BV1 and BV2) |
| Auxiliary Fan / Air Pressure Switch | LGA52.171B27 / LGA63.191A27 |
| Undervoltage Detection | Model-dependent; not provided on LGA41.153A27 |
| Degree of Protection | IP40 when integrated correctly |
| Operating Temperature | 0 to +60 °C; LGA41.173A27 / LGA52.171B27: -20 to +60 °C |
| Relative Humidity | <95% RH |
| Weight | Approx. 180 g |
| Mounting Type | Plug-in |
| Compatible Plug-in Base | AGK11 Series (accessory) |
| Reference Document | Siemens CC1N7418en (21.06.2016) |
Model Variants and Ignition Safety Time
| Model | Supply Voltage | Safety Time (TSA) |
|---|---|---|
| LGA41.153A27 | AC 220-240 V | 5 s |
| LGA41.173A27 | AC 220-240 V | 10 s |
| LGA52.150B27 | AC 220-240 V | 5 s |
| LGA52.150B17 | AC 100-110 V | 5 s |
| LGA52.171B27 | AC 220-240 V | 4.5-7.5 s |
| LGA63.191A27 | AC 230 V | 10 s |
Timing Note: Values apply at AC 220 V or AC 110 V according to model. Siemens specifies a timing multiplier of 0.7 when operating at AC 240 V. Check maximum permitted safety time separately from the nominal TSA values.
Selection Note: LGA is not recommended for new designs. Check the complete model number, operating sequence and installation conditions before replacing an existing controller.
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