Siemens Control box LME73.000A2

The Siemens LME73.000A2 is a control box for gas burners, with SKU LME73.000A2 and type designation 0005030274. It is designed for 1- or 2-stage gas burners in intermittent operation. The device handles burner start-up and control, and includes undervoltage detection, air pressure monitoring, restart limitation, and remote reset signal capability. Operation is based on digital signal processing.

Replacement control boxes of this kind must be selected by matching the exact series and type designation, as well as the supply voltage, safety time, and pre-purge time of the existing unit. The flame detection method — ionization electrode, UV scanner, or IR detector — must be compatible with the sensor in use. Different series are intentionally not interchangeable even within the same brand, and a mismatched safety time creates a hazardous condition. Also compare the mounting form: these controls are either mounted on a base or plugged into a matching connector, so the wiring base pattern must correspond.