Siemens Burner control LMO24.255C2

Siemens LMO24.255C2 burner control box is a control box used to start up and control a 2-stage liquid fuel burner. It is designed for intermittent operation with a maximum oil throughput of 30 kg/h. The unit is supplied with 230 V AC and provides a pre-purge time of 25 s, a pre-ignition time of 25 s, and a safety time of 5 s. If the burner fails to operate safely, the control locks out and must be reset manually.

When choosing a replacement control box of this type, match the supply voltage, safety time, pre-purge duration, flame detection method, and the physical base or plug pattern. Controls of this kind are generally not interchangeable across series, even within the same brand, so verify the type designation and markings on the existing unit before ordering. Also note that wall-hung boiler electronic boards are often model-specific and are not cross-referenced to a control box such as this.

When a control box of this kind does not receive a flame signal within the safety time, it locks out and must be manually reset. This results in a burner shutdown until the fault is cleared and the reset button is pressed.