Siemens Burner control box LMO44.255C2

This control box is a flame safeguard for starting and monitoring a 2-stage oil burner in intermittent operation, intended for air heaters. It uses a photoresistive flame detector with QRB/QRC sensor input and operates at 230 V AC. The control times are: waiting 5 s, pre-purge 26 s, pre-ignition 25 s, safety 5 s, and post-ignition 5 s. Maximum oil burner throughput is 30 kg/h.

Controls of this class are selected by their exact series and type designation, supply voltage, safety time, pre-purge time, and flame-detection method (ionisation, UV, or IR). The base or plug pattern must match the burner wiring. Before ordering, verify the type designation, voltage, and timing settings of the installed unit; controls of this class are not generally interchangeable across series even within the same brand, and mismatched safety times create a safety hazard.