Siemens Burner Controllers LMO14 LMO24 LMO44 Series
Siemens Burner Controllers LMO14 / LMO24 / LMO44 Series are microcontroller-based oil burner controls designed for the startup, supervision, and control of single-stage and two-stage forced draft oil burners in intermittent operation. They support flame detection using QRB1, QRB3, QRB4, and QRC1 detectors and feature undervoltage detection, remote reset, restart limitation, and multicolor LED diagnostics. Suitable for industrial boilers, steam generators, and heating systems, with oil throughput below 30 kg/h and above 30 kg/h on selected models.
Product Details
Siemens Burner Controllers LMO14 LMO24 LMO44 Series
Siemens Burner Controllers LMO14 / LMO24 / LMO44 Series
Siemens LMO14 / LMO24 / LMO44 Series are microcontroller-based oil burner controls designed for the automatic startup, supervision, and control of forced draft oil burners operating in intermittent mode.
These controllers support single-stage and two-stage oil burner applications. They provide accurate burner sequencing, reliable flame supervision, integrated safety monitoring, and multicolor LED diagnostics.
Key Features
- Automatic startup and flame supervision for forced draft oil burners
- Single-stage control with LMO14 and two-stage control with LMO24 / LMO44
- Oil throughput below 30 kg/h, and above 30 kg/h on selected versions
- Yellow-flame detection using QRB1, QRB3 or QRB4 flame detectors
- Blue-flame detection using QRC1 detectors
- Integrated undervoltage detection
- Electrical remote reset capability
- Oil preheater monitoring and bridging contact
- Accurate digital burner control sequence
- Controlled intermittent operation after 24 hours of continuous operation
- Restart limitation for improved operational safety
- Multicolor LED operating status and fault diagnostics
- Diagnostic interface support via OCI400 and ACS410 software
LMO14 / LMO24 / LMO44 Series Comparison
| Series | Control Stages | Application |
|---|---|---|
| LMO14 | 1 Stage | Single-stage forced draft oil burners with oil throughput below 30 kg/h |
| LMO24 | 2 Stages | Two-stage oil burners, including selected versions for flash-steam generators and air heaters |
| LMO44 | 2 Stages | Two-stage oil burners for stationary direct-fired air heaters |
Typical Applications
- Industrial Boiler Systems
- Forced Draft Oil Burners
- Steam Generators
- Industrial Heating Systems
- Air Heating Systems (selected models)
Technical Specifications
Technical Specifications Siemens LMO14 / LMO24 / LMO44 Series
| Brand | Siemens |
|---|---|
| Product Type | Oil Burner Controls |
| Series | LMO14 / LMO24 / LMO44 |
| Control Technology | Microcontroller-based |
| Burner Type | Forced Draft Oil Burner |
| Operating Mode | Intermittent Operation |
| Control Stages |
LMO14: Single-stage LMO24: Two-stage LMO44: Two-stage |
| Oil Throughput | Below 30 kg/h, above 30 kg/h on selected versions |
| Supply Voltage |
AC 230 V (+10% / -15%) AC 120 V (+10% / -15%) on selected models |
| Mains Frequency | 50–60 Hz ±6% |
| Power Consumption | 12 VA |
| External Primary Fuse | 6.3 A (Slow) |
| Compatible Flame Detectors | QRB1 / QRB3 / QRB4 / QRC1 |
| Degree of Protection | IP40 (ensured by installation) |
| Safety Class | Class I |
| Weight | Approx. 200 g |
| Operating Temperature |
LMO14 / LMO24: -5 to +60 °C LMO44: -20 to +60 °C |
| Relative Humidity | Below 95% RH (non-condensing) |
| Installation Altitude | Maximum 2,000 m above sea level |
| Remote Reset | Supported |
| Status Indication | Multicolor LED |
| Diagnostic Interface | OCI400 / ACS410 |
| Applicable Standards |
DIN EN 298 DIN EN 13611 DIN EN 60730-2-5 |
Model Reference and Control Timing
| Model | Voltage | Stages | Prepurge (t1) | Safety Time (TSA) |
|---|---|---|---|---|
| LMO14.111C2 | 230 V | 1 | 15 s | 10 s |
| LMO14.113C2 | 230 V | 1 | 15 s | 10 s |
| LMO24.111C2 | 230 V | 2 | 15 s | 10 s |
| LMO24.111C1 | 120 V | 2 | 15 s | 10 s |
| LMO24.011C2 | 230 V | 2 | 5 s | 10 s |
| LMO24.255C2 | 230 V | 2 | 25 s | 5 s |
| LMO44.255C2 | 230 V | 2 | 25 s | 5 s |
Note: Control timing varies by model. t1 refers to the prepurge time, while TSA refers to the ignition safety time. Always verify the complete model reference and the manufacturer's technical documentation before installation or replacement.
Dimensions
Documents & Downloads
Frequently Asked Questions
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