Siemens Burner Controllers LAL Series
Siemens Burner Controllers LAL Series are oil burner controls designed for medium- to large-capacity industrial oil burners. They support multistage and modulating operation, controlling ignition sequences, flame supervision, and air damper operation. Compatible with QRB1/QRB3, QRC1, or RAR9 flame detectors, depending on the model. Suitable for industrial boiler systems and industrial heating applications.
Product Details
Siemens Burner Controllers LAL Series
Siemens Burner Controllers LAL Series
Siemens LAL Series Oil Burner Controls are designed for controlling and supervising medium- to large-capacity industrial oil burners. They support multistage and modulating burner operation in intermittent operating systems, providing reliable burner startup sequencing, ignition control, flame supervision, and air damper control.
Key Features
- Controls burner startup sequences and ignition operations.
- Supports multistage and modulating oil burners.
- Provides flame supervision using compatible flame detectors.
- Supports controlled air damper operation and position monitoring.
- Includes safety lockout functions for abnormal operating conditions.
- Supports air pressure supervision on applicable models.
- Designed for intermittent operation with at least one controlled shutdown every 24 hours.
Available Siemens LAL Series Models
| Model | Description / Application |
|---|---|
| LAL1.25 | Designed for yellow- and blue-flame oil burners without air pressure supervision. |
| LAL2.14 | Designed for yellow-flame oil burners with air pressure supervision, including applications such as flash steam generators. |
| LAL2.25 | Suitable for industrial oil burners requiring air pressure supervision and standard burner control functions. |
| LAL2.65 | Designed for oil burner applications requiring an extended prepurge period. |
| LAL3.25 | Designed for specialized burner applications, including incinerator burner systems. |
Compatible Flame Detectors
Siemens LAL Series burner controllers support flame supervision using compatible detectors, depending on the controller model and application.
- Siemens QRB1 / QRB3 Photoresistive Flame Detectors
- Siemens QRC1 Blue-Flame Detector
- Siemens RAR9 Photocell Flame Detector
Industrial Applications
Siemens LAL Series burner controllers are suitable for industrial oil combustion systems, including industrial boilers, stationary air heaters, steam generation equipment, and other industrial heating applications requiring controlled burner operation and flame safety supervision.
Note: Technical specifications, flame detector compatibility, and control functions may vary depending on the specific LAL model. Always verify the exact product reference and Siemens technical documentation before installation or replacement.
Technical Specifications
Siemens Burner Controllers LAL Series – Technical Specifications
| Brand | Siemens |
|---|---|
| Product Type | Oil Burner Controls |
| Product Series | LAL Series |
| Available Models | LAL1.25, LAL2.14, LAL2.25, LAL2.65, LAL3.25 |
| Application | Medium- to Large-Capacity Industrial Oil Burners |
| Burner Control Type | Multistage / Modulating Burners |
| Operating Mode | Intermittent Operation (at least one controlled shutdown every 24 hours) |
| Supply Voltage | AC 230 V (-15% / +10%); AC 100–110 V versions available for selected models |
| Mains Frequency | 50–60 Hz (±6%) |
| Power Consumption | Approx. 3.5 VA |
| Internal Unit Fuse | T6.3H250V according to DIN EN 60127 |
| External Primary Fuse | Max. 10 A (Slow-Blow) |
| Permissible Input Current | Max. 5 A continuously at Terminal 1 |
| Control Terminal Current Rating | Max. 4 A continuously at specified control terminals |
| Compatible Flame Detectors | QRB1 / QRB3, QRC1 or RAR9 (depending on model) |
| Air Pressure Supervision | Available on LAL2 and LAL3 models |
| Degree of Protection | IP40 when installed, excluding the terminal base area |
| Electrical Safety Class | Class II |
| Weight | Approx. 1,000 g |
| Mounting Position | Any mounting position |
| Designed Lifetime | 250,000 burner startup cycles, corresponding to approximately 10 years under specified operating conditions |
| Applicable Standards | DIN EN 298, DIN EN 60730-2-5 |
Siemens LAL Series – Model Comparison
| Model | Prepurge Time (t1) | Ignition Safety Time (TSA) | Postpurge Time (t6) |
|---|---|---|---|
| LAL1.25 | 22.5 seconds | 5 seconds | 15 seconds |
| LAL2.14 | 10 seconds | 4 seconds | 10 seconds |
| LAL2.25 | 22.5 seconds | 5 seconds | 15 seconds |
| LAL2.65 | 66.5 seconds | 5 seconds | 15 seconds |
| LAL3.25 | 22.5 seconds | 5 seconds | 15 seconds |
Technical Note: Switching times are specified at a mains frequency of 50 Hz. At 60 Hz, switching times are approximately 17% shorter. Compatible flame detectors and plug-in bases are ordered separately.
Reference: Siemens Oil Burner Controls LAL Series, Technical Datasheet CC1N7153en, dated 01 August 2023. Specifications may vary by model. Please verify compatibility before ordering, installing, or replacing the controller.
Dimensions
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