Siemens Burner control box LFL1.322

The Siemens LFL1.322 is a burner control box for forced-draft, two-stage gas and combined burners. It runs an intermittent ignition and flame-monitoring sequence on a 220 V supply. The cycle provides a 36 s pre-purge, a 4 s pre-ignition interval, and a 2 s safety time. It is certified to EN 298 and rated for ambient temperatures of -20 to +60 °C.

When selecting a replacement for this type of control, match the exact series and type designation, the supply voltage, the safety and pre-purge times, and the flame detection method — ionisation, UV or IR. The base or plug connection must also match the existing wiring. Controls of different series are generally not interchangeable, even within the same brand, and installing one with a mismatched safety time creates a hazard. Always compare the part number with the original before ordering.