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Siemens Burner Controllers LMO64 LMO39 Series

Siemens Burner Controllers LMO64 LMO39 Series

Siemens
Siemens LMO64 and LMO39 Series are microcontroller-based oil burner controls for automatic ignition sequencing, flame supervision, and safe operation of forced-draft oil burners in intermittent mode. LMO64 is designed for single-stage burners with oil throughput below 30 kg/h and provides model-specific postpurge functions. LMO39 supports single- and two-stage burners, with configurable operating parameters and versions for higher oil throughput. Both series support compatible QRB1, QRB3, QRB4, and QRC1 flame detectors, undervoltage detection, remote reset, and multicolor LED diagnostics. Suitable for oil-fired boilers and industrial heating systems.

Product Description

Siemens Burner Controllers LMO64 / LMO39 Series

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

These controllers combine digital burner program sequencing, flame signal monitoring, safety lockout, and operating diagnostics. They support compatible flame detectors for yellow-burning and blue-burning oil flames.

Key Features

  • Automatic burner startup and ignition sequencing
  • Flame supervision with compatible QRB1, QRB3, QRB4, and QRC1 detectors
  • Undervoltage detection and safety shutdown
  • Electrical remote reset capability
  • Oil preheater monitoring and bridging contact support
  • Multicolor LED operating status and fault diagnostics
  • Accurate, repeatable digital program sequencing
  • Controlled intermittent operation with automatic restart after a maximum of 24 hours
  • Limitation of repeated burner startup attempts
  • Service diagnostics using compatible Siemens interfaces and software

LMO64 vs. LMO39 Series

  • LMO64 Series: Designed for single-stage forced-draft oil burners with oil throughput below 30 kg/h. Provides a postpurge function with model-dependent timing.
  • 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 on specified versions. Program times and selected functions can be configured using compatible Siemens equipment.

Compatible Flame Detectors

  • QRB1 / QRB3: Photoresistive detectors for yellow-burning oil flames
  • QRB4: Yellow-flame detector
  • QRC1: Blue-flame detector

Industrial Applications

  • Oil-fired steam and hot water boilers
  • Industrial oil burner systems
  • Industrial heating equipment
  • Forced-draft liquid-fuel combustion systems
  • Compatible stationary air heaters

Available Models

  • LMO64.300C2: AC 230 V, single-stage, postpurge 20 s
  • LMO64.301C2: AC 230 V, single-stage, postpurge 90 s
  • LMO64.302C2: AC 230 V, single-stage, postpurge 20 s, available on request
  • LMO39.100C1: AC 120 V, configurable single- or two-stage oil burner control
  • LMO39.100C2: AC 230 V, configurable single- or two-stage oil burner control

Product Selection Guidelines

Confirm the supply voltage, burner stages, oil throughput, flame detector type, required safety time, postpurge function, wiring arrangement, and applicable burner control parameters before selecting a replacement unit.

Important: Installation, parameterization, and commissioning must be performed by qualified personnel according to Siemens technical documentation. Plug-in bases and flame detectors are ordered separately.

Specifications

Siemens LMO64 / LMO39 Technical Specifications

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
External Primary Fuse 6.3 A (Slow) T6.3H250V
Compatible Flame Detectors QRB1 / QRB3 / QRB4 / QRC1 QRB1 / QRB3 / QRB4 / QRC1
Ignition Safety Time (TSA) Max. 10 s 5 s requirement; parameterizable within specified limits
Postpurge Time (t8) 20 s or 90 s, depending on model Parameterizable
Remote Reset Supported Supported
Status Indication Multicolor LED Multicolor LED
Safety Class Class I Class I
Degree of Protection IP40 when correctly mounted IP40 when correctly mounted; IP10 if RJ11 jack is uncovered
Operating Temperature -5 to +60 °C -20 to +60 °C
Approximate Weight 200 g 160 g
Reference Standard DIN EN 298 DIN EN 298
Reference Document CC1N7138en (30.09.2025) CC1N7154en (07.09.2023)

LMO64 Series Models

Model Voltage Stages Prepurge (t1 / t1') Safety Time (TSA) Postpurge (t8)
LMO64.300C2 AC 230 V 1 15 / 16 s 10 s 20 s
LMO64.301C2 AC 230 V 1 15 / 16 s 10 s 90 s
LMO64.302C2 AC 230 V 1 15 / 16 s 10 s 20 s

LMO64 Note: LMO64.302C2 is available on request. Its postignition time differs from the other versions. The listed program times are manufacturer-specified limits.

LMO39 Series Models

Model Voltage Stages Safety Time Requirement Postpurge
LMO39.100C1 AC 120 V 1 / 2 5 s Parameterizable
LMO39.100C2 AC 230 V 1 / 2 5 s Parameterizable

Technical Note: The LMO39 safety time and operating sequences must be configured according to the application and manufacturer limits. Values in the type summary are not necessarily the final commissioned settings. Refer to Siemens Datasheets CC1N7138en and CC1N7154en for installation and replacement.