Siemens Burner Controllers LMO64 LMO39 Series

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.