Siemens LFL Series Technical Instructions
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Siemens LFL Series, Technical Instructions Document No. 7451US LFL... Rev. 2 November 15, 2004 LFL Series Burner Flame Safeguard Control The LFL… is a compact electro-mechanical primary flame safeguard control designed to provide burner sequencing, automatic igni- tion and continuous flame monitoring fo r gas, oil, and dual fuel, single burner applica- tions. The LFL… is applicable for on-off, multi- stage or modulating burners. The LFL… is designed 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 accomplis
Siemens LFL Series, Control interface 2/12 Siemens Building Technologies HVAC Products Indicator dial visible through front window Lockout indicator light visible through front window The LFL… reset button is integrated with the front window. During a lockout condition, pressing the window resets the LFL... Pressing * the window or remote reset during normal operation will lockout the LFL… *Do not hold reset button for more than 10 seconds! (Local or remote) , exceeding 10 seconds will damage control ! Manually press the lockout reset button. Do NOT use any tools or pointed objects. Indicator dial pr
Siemens LFL Series, Ordering Information Table 1 Product Numbers 110 Vac 50/60 Hz * LFL1.133-110V LFL1.333-110V LFL1.335-110V LFL1.635-110V 220 Vac 50/60 Hz * LFL1.133 LFL1.335 LFL1.635 Timing description Pre-purge time 7.5 sec 26 sec 31 sec 55 sec Pilot trial for ignition (PTFI) 2.5 sec 4 sec 4 sec Main trial for ignition (MTFI) 2.5 sec 4 sec Interval from the beginning of MTFI until release to modulation 2.5 sec 10 sec 10.5 sec Post purge time 12 sec 15 sec 12 sec Flame failure response time (FFRT) 1 sec *All times listed above are for 60 Hz operation. (Times for 50 Hz operation will be 20% longer.) Description Product Number L
Siemens LFL Series, Specifications Supply voltage 100 Vac –15 % ... 110 Vac +10 % 50/60 Hz ±6 % 220 Vac –15 % ... 240 Vac +10 % 50/60 Hz ±6 % Internal fuse 6.3 A (slow) External fuse Maximum 10 A (slow) Weight – LFL 2.2 lb Weight – Wiring base 0.25 lb Power consumption 3.5 VA Mounting orientation No restrictions General Terminal 1 Line Maximum 5 A total load Terminal 2 Neutral N/A Terminal 3 Alarm 1 A pilot duty Terminals 4 to 5 Limit string N/A Terminals 6 and 7 Combustion Air Blower Motor 4 FLA, 24 LRA or 1.6 A pilot duty Terminals 8, 9,
Siemens LFL Series, Specifications continued… Voltage – during burner operation Voltage – during start-up phase (flame circuit check) 330 Vac ±10 % 380 Vac ±10 % Required minimum UV sensor signal Typical UV sensor signal measurement 70 µA 100-450 µA Length of detector cable (run in a separate conduit from all other wiring) - Unshielded wire - Shielded cable, shield grounded to terminal 22 max. 300 ft max. 600 ft Flame supervision with UV sensor QRA... Volta
Siemens LFL Series, Description of operating controls and their functions LFL input (1) HOT and LFL input (2) NEUTRAL are used for control power, Powe r Reset and Alarm LFL output (3) ALARM, for alarm indication LFL input (21) RESET, as show for reset and/or remote shutdown Pressure or temperature activated, the operating limit switch (OLS), Operating limit OLS Closes, for burner start-up sequence to begin, and Opens, for a burner controlled shutdown Pressure, temperature, or level activated, limit switches examples include: Limit switches LGP HGP LWS
Siemens LFL Series, Program Sequence ECONOMY (FULLY CLOSED ) CLOSE (MINIMUM) MAIN (DIRECT IGNITION) MAIN (PILOTED) COMBUSTION AIR BLOWE R COMBUSTION AIR SW TEST COMBUSTION AIR PROVE RECYCLE LIMITS LOCKOUT LIMITS POWER (NEUTRAL) POWER (HOT) ACTUATOR FEEDBACK POC (PROOF OF CLOSURE) RELEASE TO MOD NOT USED FLAME SIGNAL COMBUSTION AIR BLOWE R CLOSE (MINIMUM) ECONOMY (FULLY CLOSED) P OPEN Modulation 1 2 ... ... ... ... ... ... MTFI PTFI IDLE ... ... ... ... 19 22 23 24 18 16 17 PILOT IGNITION POSTPURGE ACTUATOR 20 11 10 9 OPEN PROGRAM SEQUENCE CHART S TART
Siemens LFL Series, Dimensions Dimensions in inches 2 Places (5.2 x 6.4 mm) 3/16 x 1/4 7 16 4 3 5 8 0 3 5 8 7 16 1 7 16 4.4 mm)Ø( 3/16Ø Ground Ø 5/16 (Ø 7.5 mm) 5 5 8 0 4 1 3 8 5 8 0 4 0 1 5 16 2 11 16 Ø 3/4 4 0 1 5 16 3 5 16 2 5 16 Top Right Front LeftBack 11/12 Siemens Building Technologies CC1N7451en HVAC Products 11.15.2004
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