Siemens Control box LDU11.323A27

A burner control box that manages the ignition sequence and monitors safety interlocks during operation. It provides a 22.1 s pre-purge, a 2.5 s pre-ignition time, and a 27 s safety time. Supply voltage is 220–240 V AC at 50–60 Hz, with power consumption of 2.5 W and an external fuse rating of 10 A. Protection class is IP40.

When replacing a control box of this type, match the exact series and full type designation, supply voltage, pre-purge time, safety time, and flame detection method. The base or plug pattern must correspond to the existing wiring. Compare the timing sequence against the original unit because even within the same brand different series are not interchangeable. Verify the full type designation on the old control before ordering, as multiple variants exist for different voltage and timing specifications.