Siemens LEC1 Series Industrial Burner Controllers
Product Description
Siemens Burner Controllers LEC1 Series
Siemens LEC1 Series are industrial burner control units developed for automatic startup, ignition sequencing and supervision of forced-draft oil, gas and dual-fuel burners. The controllers support double-flame and multiflame supervision, with continuous or intermittent operation depending on the selected flame safeguard.
LEC1 is used with separate Siemens flame safeguards such as LAE10, LFE10 and LFE50. The controller manages the burner program, fan motors, air damper, ignition transformer, fuel valves and associated safety functions, while the connected flame safeguard evaluates the flame signal.
Key Features
- Automatic burner startup and operating sequence control
- Double-flame and multiflame supervision with separate flame safeguards
- Adjustable prepurge time from 8 to 63 s
- Adjustable first and second safety times from 0 to 9 s
- Automatic air damper control with optional postpurge
- Air pressure switch monitoring and functional checks before startup
- Direct ignition or pilot burner configurations according to system design
- Automatic extraneous-light supervision during off and purge periods
- Safety lockout on specified flame or air pressure failures
- Built-in lockout warning lamp and electrical remote reset
- Operating program and fault phase visible through the viewing window
Compatible Siemens Flame Safeguards
| Flame Safeguard | Detector / Application | Operating Mode |
|---|---|---|
| LAE10 | RAR photocell detector for oil burners | Intermittent |
| LFE10 | Ionization probe for gas burners or QRA UV detector for gas, oil and dual-fuel burners | Intermittent |
| LFE50 | QRA50 / QRA51 UV detectors for gas, oil and dual-fuel burners | Continuous / Intermittent |
Operating Principle
After receiving a heat demand, LEC1 verifies the required safety conditions and initiates the burner startup sequence. Prepurging, air damper positioning and ignition occur according to the configured program. The connected flame safeguard must confirm flame establishment within the specified safety time.
Depending on the burner configuration, LEC1 can control the fan motor, flue gas fan, air damper, ignition transformer, up to three fuel valves, load controller and external fault signaling equipment.
Typical Applications
- Industrial steam and hot water boilers
- Forced-draft gas and oil burners
- Dual-fuel industrial combustion systems
- Dual-flame and multiflame installations
- Industrial process heating equipment
- Maintenance and replacement of compatible existing burner controls
Selection and Replacement Guidelines
Verify the complete LEC1 type reference, mains voltage, frequency, flame safeguard, detector type, prepurge and safety times, fuel valve sequence, air damper arrangement, terminal base and wiring before replacement.
Important: Siemens states that LEC1 should not be used for new designs. The correct operating mode depends on the connected flame safeguard. All installation, adjustment and commissioning work must be performed by qualified personnel according to Siemens technical documentation.
Specifications
Siemens LEC1 Series Technical Specifications
| Specification | Technical Data |
|---|---|
| Brand | Siemens |
| Product Series | LEC1 Series |
| Product Type | Industrial Burner Control Unit |
| Burner Type | Forced-Draft Oil / Gas / Dual-Fuel Burners |
| Flame Supervision | Double-Flame / Multi-Flame using separate safeguards |
| Operating Mode | Continuous / Intermittent, depending on flame safeguard |
| Rated Voltage | AC 220–240 V or AC 100–110 V, model-dependent |
| Mains Frequency | 50–60 Hz ±6% |
| Power Consumption - Startup | 8 VA |
| Power Consumption - Operation | 5 VA |
| Built-in Fuse | T6.3H250V |
| External Fuse | Max. 10 A (Slow) |
| Output Load per Terminal | Max. 4 A (AC3) |
| Total Output Load | Max. 5 A (AC3) |
| Prepurge Time (t1) | Adjustable: 8–63 s |
| First Safety Time (TSA) | Adjustable: 0–9 s |
| Second Safety Time (t9) | Adjustable: 0–9 s |
| Air Damper Control | Automatic control with optional postpurge |
| Air Pressure Supervision | Air pressure switch monitoring where configured |
| Protection Rating | IP40 when correctly mounted |
| Operating Temperature | -20 to +60 °C |
| Transport Temperature | -50 to +60 °C |
| Relative Humidity | <95% RH, non-condensing |
| Installation Altitude | Max. 2,000 m above sea level |
| Weight | Approx. 2 kg |
| Mounting Position | Any orientation |
| Compatible Flame Safeguards | LAE10 / LFE10 / LFE50 |
| Terminal Base | AGG41041713 (EC) / AGG12.1, ordered separately |
| Designed Lifetime | 250,000 burner startup cycles or approx. 10 years under specified conditions |
| Technical Reference | Siemens CC1N7761en (21.08.2018) |
Flame Safeguard Compatibility
| Model | Flame Detector | Operation |
|---|---|---|
| LAE10 | RAR Photocell | Intermittent |
| LFE10 | Ionization Probe / QRA UV | Intermittent |
| LFE50 | QRA50 / QRA51 UV | Continuous / Intermittent |
Technical Note: The first and second safety times must be set according to the burner application and applicable safety requirements. Continuous operation requires a suitably rated flame safeguard. Siemens identifies LEC1 as unsuitable for new designs. Verify the exact type reference, factory settings and connection diagram before installation or replacement.
Product Specifications
Siemens LEC1 Series Technical Specifications
| Specification | Technical Data |
|---|---|
| Brand | Siemens |
| Product Series | LEC1 Series |
| Product Type | Industrial Burner Control Unit |
| Burner Type | Forced-Draft Oil / Gas / Dual-Fuel Burners |
| Flame Supervision | Double-Flame / Multi-Flame using separate safeguards |
| Operating Mode | Continuous / Intermittent, depending on flame safeguard |
| Rated Voltage | AC 220–240 V or AC 100–110 V, model-dependent |
| Mains Frequency | 50–60 Hz ±6% |
| Power Consumption - Startup | 8 VA |
| Power Consumption - Operation | 5 VA |
| Built-in Fuse | T6.3H250V |
| External Fuse | Max. 10 A (Slow) |
| Output Load per Terminal | Max. 4 A (AC3) |
| Total Output Load | Max. 5 A (AC3) |
| Prepurge Time (t1) | Adjustable: 8–63 s |
| First Safety Time (TSA) | Adjustable: 0–9 s |
| Second Safety Time (t9) | Adjustable: 0–9 s |
| Air Damper Control | Automatic control with optional postpurge |
| Air Pressure Supervision | Air pressure switch monitoring where configured |
| Protection Rating | IP40 when correctly mounted |
| Operating Temperature | -20 to +60 °C |
| Transport Temperature | -50 to +60 °C |
| Relative Humidity | <95% RH, non-condensing |
| Installation Altitude | Max. 2,000 m above sea level |
| Weight | Approx. 2 kg |
| Mounting Position | Any orientation |
| Compatible Flame Safeguards | LAE10 / LFE10 / LFE50 |
| Terminal Base | AGG41041713 (EC) / AGG12.1, ordered separately |
| Designed Lifetime | 250,000 burner startup cycles or approx. 10 years under specified conditions |
| Technical Reference | Siemens CC1N7761en (21.08.2018) |
Flame Safeguard Compatibility
| Model | Flame Detector | Operation |
|---|---|---|
| LAE10 | RAR Photocell | Intermittent |
| LFE10 | Ionization Probe / QRA UV | Intermittent |
| LFE50 | QRA50 / QRA51 UV | Continuous / Intermittent |
Technical Note: The first and second safety times must be set according to the burner application and applicable safety requirements. Continuous operation requires a suitably rated flame safeguard. Siemens identifies LEC1 as unsuitable for new designs. Verify the exact type reference, factory settings and connection diagram before installation or replacement.
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