Siemens LFL Series, LFL1.133-110V, LFL1.333-110V, LFL1.335-110V, LFL1.635-110V Technical Instructions
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 ignition and continuous flame monitoring fo
r
gas, oil, and dual fuel, single burner applications.
The LFL… is applicable for on-off, multistage 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 control. 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
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HVAC Products
Control interface
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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 provides symbolic information about the program sequence, the type of fault,
and the point in the sequence where the fault occurred.
The LFL…
sequence is
fixed and
cannot be
manually
manipulated.
Installation
• All installation and commissioning work must be performed by qualified personnel.
• The LFL… must be mounted in an electrical enclosure, typically in the control panel.
• All wiring must comply with applicable electrical codes standards and regulations.
• Before performing any wiring to the LFL…, remove and isolate all power.
• High voltage AC wiring must not be installed in the same conduit
as the flame detector wiring.
• Maximum 10 A slow external fuse is required.
• The LFL is not adversely affected by electromagnetic resonance.
• Ground the LFL… wiring base.
• Do not open or modify the LFL...
• When UV flame supervision is used, other sources of radiation, such as halogen
lamps, welding equipment, ignition sparks can produce erroneous flame signals.
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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
LFL Control unit Refer to Table 1 above
(without wiring base)
Wiring base AGM410490550
Flame sensor
UV (shown) QRA 4.U
forward looking 3/4” NPT
UV Refer to
QRA2… , QRA10 … Technical Instruction 7712
Flame rod By others
Wiring Base
The wiring base provides the following:
• 24 Terminals ______________
• 3 Ground connections __________________--
• 3 Neutral connections,
connected to terminal 2
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Siemens Building Technologies CC1N7451en
HVAC Products 11.15.2004
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, 10, 11 Damper actuator N/A
Terminals 12, 13, 14 Air flow interlock N/A
Terminal 16 Ignition transformer 4 A
Terminal 17 Pilot fuel valve Motor 4 FLA, 24 LRA or 1.6 A pilot duty
Terminal 18 Main fuel valve Motor 4 FLA, 24 LRA or 1.6 A pilot duty
Terminal 19 Main fuel valve Motor 4 FLA, 24 LRA or 1.6 A pilot duty
Terminal 20 Damper actuator N/A
Terminal ratings
110V
UL File: MH26134 Standard: UL372
CSA Certificate: 1370843 Standard: CAN/CSA-C22.2 No 199-M89
FM File: J.I. 3003560 Standard: FM7610
110V & 220V
CE File: CE-0085AP0001 Standard: DIN EN 298
FCC Compliant Part 15 Class B - Emissions
Approvals
Vibration 0.5G Environment
Operation temperature range -5...+140 °F < 95 % relative humidity
Storage temperature range -58...+140 °F < 95 % relative humidity
Condensation, formation of ice and ingress
of water are not permitted!
Environmental
ratings
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