Siemens LFL Series Technical Instructions

Contents

Technical InstructionsDocument No. 7451USLFL...Rev. 2 November 15, 2004LFL SeriesBurner Flame Safeguard ControlThe LFL… is a compact electro-mechanicalprimary flame safeguard control designed toprovide burner sequencing, automatic igni-tion and continuous flame monitoring forgas, oil, and dual fuel, single burner applica-tions.The LFL… is applicable for on-off, multi-stage or modulating burners. The LFL… isdesigned for direct main burner ignition,intermittent or interrupted pilot operation.The LFL… integrates the flame amplifier,purge timer and sequencer in a single con-trol. Flame supervision is accomplishedusing UV sensor or flame rod detection.Features• Primary flame safeguard control• Visual sequence indication• Optional combustion air blower control• Optional postpurge• Preignition interlock• Continuous flame monitoring,including extraneous light detection• UV sensor functional test• Proven air switch function• Proven high fire purge interlock• Proven low fire ignition interlock• Direct main burner ignition,intermittent or interrupted pilot operation• Integrated flame amplifier• UV sensor or flame rod detector• Lockout alarm terminal• Local and optional remote reset• Burner off – economy position(fully closed air damper interlock)• Unit fuse and spare fuse providedContentsControl Interface ................................................. 2Installation........................................................... 2Ordering information ........................................... 3Wiring base......................................................... 3Specifications ..................................................... 4Specifications continued ..................................... 5Description of oper controls ................................ 6Ladder diagram external connections ................. 7Sequence Dial OPERATION .............................. 8Sequence Dial FAULT and LOCKOUT ............... 9Sequence Chart ................................................ 10Dimensions ....................................................... 1111.15.2004Siemens Building TechnologiesHVAC Products