Siemens LGB21.350A27 control box

Siemens LGB21.350A27 burner control unit for pre-purge at low air volume and actuator control. Siemens LGB21.350A27 for start-up and supervision of single- and two-stage gas or combined gas/oil burners in intermittent operation. Pre-purge time: 30 s. Safety time: 5 s. Pre-ignition time: 2 s.