Overview
The Siemens LMO64.301C2 is a microprocessor-based burner control unit designed for the startup, supervision, and control of 1-stage forced draft oil burners in intermittent operation. Engineered for burners with an oil throughput of up to 30 kg/h, this advanced controller ensures high-precision program sequences through digital signal handling. It is a critical safety component for industrial and commercial heating applications, providing reliable flame monitoring and comprehensive fault diagnosis to optimize burner performance and energy efficiency.
Features
- Microprocessor-controlled digital signal processing for accurate and reproducible program times
- Support for yellow-burning flame supervision via QRB1, QRB3, or QRB4 photoresistive detectors
- Support for blue-burning flame supervision via QRC blue-flame detectors
- Integrated undervoltage detection and electrical remote reset functionality
- Bridging contact and time monitoring for oil preheaters
- Multicolor LED indicator for real-time status and fault messages
- Controlled intermittent operation with a mandatory shutdown after 24 hours of continuous use
- Limitation of the number of repetitions to enhance system safety
- Durable, heat-resistant, and flame-retarding plastic plug-in housing
- Designed for 250,000 startup cycles, approximately a 10-year service life
Specifications
- Model: LMO64.301C2
- Mains Voltage: AC 230 V (+10% / -15%)
- Frequency: 50/60 Hz (+/- 6%)
- Power Consumption: 12 VA
- Safety Time (TSA): 10 seconds
- Prepurge Time (t1): 15 seconds
- Postpurge Time (t8): 90 seconds
- External Primary Fuse: 6.3 A (slow)
- Protection Rating: IP40 (when mounted)
- Operating Temperature: -5 C to +60 C
- Weight: Approximately 0.2 kg (0.44 lbs)
Applications
- Startup and supervision of 1-stage forced draft oil burners in monoblock design
- Use in industrial and commercial oil heating systems and boilers
- Integration into gas-fired equipment conforming to EN 267 and EN 230 standards
- Compatible with Siemens burner controls and accessories such as the AGK11 plug-in base and OCI400 interface for PC-based diagnostics


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