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 for
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 accomplished
using 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 provided
Contents
Control Interface ................................................. 2
Installation........................................................... 2
Ordering information ........................................... 3
Wiring base ......................................................... 3
Specifications ..................................................... 4
Specifications continued ..................................... 5
Description of oper controls ................................ 6
Ladder diagram external connections ................. 7
Sequence Dial OPERATION .............................. 8
Sequence Dial FAULT and LOCKOUT ............... 9
Sequence Chart ................................................ 10
Dimensions ....................................................... 11
11.15.2004
Siemens Building Technologies
HVAC Products
