Siemens „LAL3.25“-Steuergerät

Siemens LAL3.25 burner control unit is used for start-up and control of multi-stage or modulating forced-draft liquid fuel burners of medium and high power with intermittent operation and air pressure monitoring via functional check of the air pressure switch during start-up and operation. Yellow flame monitoring is performed using a photoresistive sensor QRB1…, blue flame monitoring using a RAR… sensor with a selenium photocell. Main characteristics: Supply voltage: AC 230 V. Pre-purge time: 22.5 s. Safety time: 5 s. Time to ignition: 2.5 s. Time after ignition: 15 s. Interval between voltage application to terminals: 7.5 s. Interval between voltage switching at terminals: 7.5 s. Post-purge time: 15 s. Fan motor start delay: 2.5 s. Start-up sequence duration: 47 s.