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Siemens Burner Controllers LMO64 LMO39 Series

Siemens Burner Controllers LMO64 LMO39 Series

Siemens
Siemens Burner Controllers LMO64 / LMO39 Series are microcontroller-based oil burner controls designed for startup sequencing, flame supervision, and safe operation of forced-draft oil burners in intermittent operation. The LMO64 supports single-stage burners, while the LMO39 supports single- and two-stage burners. Both series are compatible with QRB1, QRB3, QRB4, and QRC flame detectors and feature undervoltage detection, remote reset, and multicolor LED diagnostics. Suitable for oil-fired boiler and industrial heating applications.

Product Description

Siemens Burner Controllers LMO64 / LMO39 Series

Siemens LMO64 / LMO39 Series are microcontroller-based oil burner controls designed for startup sequencing, flame supervision, and control of forced-draft oil burners in intermittent operation.

These burner controls provide reliable control sequences for liquid-fuel combustion systems. They support various flame detectors for monitoring burner flame conditions and controlling the operating sequence of oil-fired burner systems.

Key Features

  • Automatic startup and ignition sequence control
  • Flame supervision using QRB1, QRB3, QRB4, and QRC detectors
  • Undervoltage detection
  • Electrical remote reset capability
  • Oil preheater monitoring and control support
  • Multicolor LED status and fault indication
  • Accurate and reproducible digital program sequencing
  • Controlled intermittent operation after 24 hours of continuous operation
  • Limitation of repeated startup attempts

LMO64 vs. LMO39 Series

  • LMO64 Series: Designed for single-stage forced-draft oil burners with fuel throughput below 30 kg/h. Includes a postpurge function to ventilate the combustion chamber after burner operation.
  • LMO39 Series: Designed for single-stage and two-stage forced-draft oil burners. Supports oil throughput up to 30 kg/h, and above 30 kg/h for certain versions. Features configurable operating parameters.

Applications

Suitable for oil-fired boilers, industrial heating equipment, and forced-draft oil burner systems requiring automatic ignition control and continuous flame supervision during burner operation.

Important: The exact model, supply voltage, operating sequence, and compatible accessories must be verified against the corresponding Siemens technical documentation before installation or replacement. Installation and servicing must be performed by qualified personnel.

Specifications

Technical Specifications – Siemens LMO64 / LMO39

Specification LMO64 Series LMO39 Series
Brand Siemens Siemens
Product Type Oil Burner Control Oil Burner Control
Control Technology Microcontroller-based Microcontroller-based
Burner Type Forced-draft oil burner Forced-draft oil burner
Burner Stages Single-stage Single-stage / Two-stage
Oil Throughput Below 30 kg/h Up to 30 kg/h; above 30 kg/h on certain versions
Supply Voltage AC 230 V (+10% / -15%) AC 120 V or AC 230 V, depending on model
Mains Frequency 50–60 Hz (±6%) 50–60 Hz
Power Consumption 12 VA 12 VA
Compatible Flame Detectors QRB1 / QRB3 / QRB4 / QRC QRB1 / QRB3 / QRB4 / QRC
Ignition Safety Time (TSA) Max. 10 seconds Max. 5 seconds, specified requirement
Postpurge Time 20–90 seconds, depending on model Configurable by parameter
Remote Reset Supported Supported
Status Indication Multicolor LED Multicolor LED
Degree of Protection IP40 when correctly installed IP40 when correctly installed
Operating Temperature -5 to +60 °C -20 to +60 °C
Approximate Weight 200 g 160 g
Reference Standard DIN EN 298 DIN EN 298

Available Models

  • LMO64.300C2
  • LMO64.301C2
  • LMO64.302C2 (On Request)
  • LMO39.100C1
  • LMO39.100C2

Technical information is based on Siemens Data Sheets CC1N7138en and CC1N7154en. Specifications and operating times may vary depending on the exact model and parameter configuration.