Siemens LFL Series User Manual

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 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

Siemens LFL Series Specifications

General

Brand	Siemens
Model	LFL Series
Category	Control Unit
Language	English

Summary

Features

Control Interface

Installation

Ordering Information

Wiring Base

Specifications

General

General technical data including voltage, fuse, weight, power consumption, and mounting.

Terminal Ratings

Details the electrical connections and maximum loads for each terminal on the LFL unit.

Approvals

Lists the certifications and standards met by the LFL unit, including UL, CSA, FM, CE, and FCC.

Environmental Ratings

Specifies the operating conditions, vibration tolerance, and temperature/humidity limits for the LFL unit.

Flame Supervision with UV Sensor

Technical details on using UV sensors for flame detection, including voltage, signal requirements, and cable length.

Flame Supervision with Flame Rod

Technical details on using flame rods for flame detection, including voltage, signal requirements, and cable length.

Description of Operating Controls and Functions

Wiring Diagram

Sequence Dial - Operation

Sequence Dial - Fault and Lockout Indication

Program Sequence Chart

Dimensions