The Siemens LEC1/9500 Serie 02 is a high-performance burner control unit designed for the fully automatic startup and supervision of gas, oil, or dual-fuel burners. It is primarily utilized in large-capacity combustion plants where forced draft burners require precise sequence control and flame monitoring. This “Serie 02” revision incorporates advanced safety logic for pre-purge timing and ignition sequences, working in conjunction with flame detectors (such as the QRA series) to ensure instantaneous fuel shut-off in the event of flame failure or loss of air pressure, adhering to strict international combustion safety standards.

Product Q&A

Q1: What is the primary difference between the LEC1 and standard LAL/LOK burner controls? A1: The LEC1 is a more specialized controller designed for larger, complex dual-fuel systems. It offers more flexible programming for pre-purge times and is often used in industrial applications requiring higher load capacities and specific safety interlock sequences.

Q2: Can this unit be used with a UV flame detector? A2: Yes, the LEC1/9500 is commonly paired with Siemens QRA series UV detectors or ionization probes. The unit processes the signal from these sensors to confirm the presence of a stable flame before and during the fuel release phase.

Q3: What does a red light on the lockout indicator typically signify? A3: A lockout indicates a safety shutdown. This could be caused by a failure to ignite within the safety period, loss of the air pressure signal, or a parasitic light signal detected during the pre-purge phase. The unit must be manually reset after the fault is cleared.

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