Siemens Burner Controllers LAL Series
Product Description
Siemens Burner Controllers LAL Series
Siemens LAL Series Oil Burner Controls are designed to control and supervise medium- to large-capacity industrial oil atomizing burners with multistage or modulating operation.
The units manage burner startup, prepurge, ignition sequencing, fuel valve operation, checked air damper control and flame supervision. They operate intermittently and require at least one controlled shutdown every 24 hours.
Key Features
- Automatic startup and ignition sequencing for industrial oil burners
- Multistage and modulating burner control
- Flame supervision with compatible Siemens QRB1/QRB3, QRC1 or RAR9 detectors, depending on model
- Checked air damper control and position monitoring
- Air pressure switch supervision on LAL2 and LAL3 models
- Safety lockout for specified combustion faults
- Integrated lockout indication and reset function
- Intermittent operation requiring controlled shutdown at least every 24 hours
Available Siemens LAL Models
| Model | Description / Application |
|---|---|
| LAL1.25 | Yellow- and blue-flame oil burners without air pressure supervision; supports compatible QRB1/QRB3 and QRC1 detectors. |
| LAL2.14 | Yellow-flame burners with air pressure supervision; suitable for flash steam generator applications. |
| LAL2.25 | General-purpose industrial oil burners with air pressure supervision. |
| LAL2.65 | Medium- or heavy-oil burners requiring extended prepurge. |
| LAL3.25 | Specialized applications, including compatible incinerator burners, with startup prevention during extraneous-light detection. |
Flame Detector Compatibility
- LAL1.25: QRB1 / QRB3 photoresistive detectors or QRC1 blue-flame detector.
- LAL2.14 / LAL2.25 / LAL2.65: QRB1 / QRB3 photoresistive detectors or RAR9 photocell detector.
- LAL3.25: QRB1 / QRB3 or RAR9, subject to the specific operating configuration.
- AC 100–110 V versions: Detector compatibility is limited to QRB1/QRB3 or RAR9 as specified by Siemens.
Industrial Applications
- Industrial steam and hot water boilers
- Multistage and modulating oil burners
- Flash steam generators
- Medium- and heavy-oil combustion equipment
- Stationary industrial air heaters
- Specialized incinerator burner installations
Selection and Replacement Guidelines
Confirm the full LAL model number, supply voltage, detector compatibility, prepurge time (t1), ignition safety time (TSA), postpurge time (t6), air pressure switch requirements, wiring and compatible plug-in base before ordering or replacing the controller.
Safety Note: LAL3.25 prevents startup when extraneous light is detected, rather than initiating the same lockout behavior as other LAL models. The flame failure response also depends on the specified wire-link configuration. Installation and commissioning must follow Siemens CC1N7153en and be carried out by qualified personnel.
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.
Product 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.
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