Siemens Burner management system LMV26.300A2

This control box is a burner management system for startup and control of forced-draft burners. It supports gas, oil, or combination firing and multi-stage or modulating operation of any capacity. It provides electronic air/fuel ratio control for two actuators and includes a 4...20 mA analogue output for load controller. It is programmable, has an AZL2x display connection, performs fuel valve leak testing and fan frequency converter control, and monitors all safety-related inputs/outputs via a feedback network. Flame monitoring can be done with QRB.., QRC.., QRA2, QRA4.., or QRA10.. detectors; combination firing with two fuel valves requires a separate AGM60.. fuel changeover unit.

Burner management systems of this type are selected by supply voltage, pre-purge and safety times, flame detection method (ionisation, UV, or IR), and the base or plug pattern. Controls from different series within the same brand are not interchangeable; mismatched safety times or voltage create a safety hazard. Before ordering, confirm the exact manufacturer code and catalogue number against the existing unit, as the part number encodes specific parameters. If the original control is an older model, consult the manufacturer's cross-reference to verify compatibility before installation.