Siemens LFL Series Owner's 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

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

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HVAC Products

Control interface

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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.

11.15.2004

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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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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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...

Voltage at the flame rod – during burner operation

Voltage at the flame rod – during start-up phase (flame circuit check) 330 Vac ±10 %

380 Vac ±10 %

Required minimum flame rod signal

Typical flame signal measurement 6 µA

20-100 µA

Short-circuit current max. 0.5 mA

Length of detector cable (run in a separate conduit from all other wiring)

- Unshielded wire

- Shielded cable, shield grounded to terminal 22

max. 250 ft

max. 500 ft

Flame

supervision

with

Flame rod

Electrical connection notes for flame supervision

• It is important to minimize electrical disturbance and signal loss.

• Run flame signal wiring separate from all other wiring

• Observe the length of detector cable as indicated above

• The flame rod does not provide protection from electric shock

• Locate the ignition electrode(s) and flame rod such that the ignition spark cannot arc to the

flame rod (risk of electrical overload and damage to flame supervision circuit)

• When using the QRA..., grounding of terminal 22 is required

• Multiple UV sensors QRA... and/or flame rods can be connected in parallel

• If separate flame sensors are used for pilot and main flame supervision,

an interrupted pilot must be utilized

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Description of operating controls and their functions

LFL input (1) HOT and LFL input (2) NEUTRAL are used for control power,

Powe

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

High Limit

Low gas pressure (LGP) opens on low gas pressure

High gas pressure (HGP) opens on high gas pressure

Low water switch (LWS) opens on low water

These limit and are considered either to be recycle or non-recycle, (manual reset),

and are connected between; LFL output (5) RECYCLE and LFL input (4) RECYCLE

Recycle limit switches are used when it is desireable to stop the burner when the switch opens,

and restart it again, automatically, when the switch closes again.

Non-recycle limit switches are used when it is desireable to lockout the burner when the switch

opens and prevent if from automatically restarting again. These switches must be manually reset,

on the switch itself, as well as require you to push the reset button on the LFL to allow a new start-

up sequence.

The High Limit switch is almost always a non-recycle limit switch, and is usually connected to;

LFL input (1) HOT

NFPA 85, CSD-1 and UL795 require the HGP, LGP to cause a shutdown and be manually reset.

Most burner / boiler insurance codes also require a LWS.

The fuel proof of closure (POC) switch is integral to the fuel valve and activated by the valve

mechanics. The POC prevents a burner start-up if the fuel valve is not in the proved close posi-

tion.

Fuel proof of closure

POC

LFL input (12) POC, is provided for this purpose. Note -This is a ‘Precondition for Startup’ and

must be powered to start a sequence.

Combustion air blowe

CAB The combustion air blower (CAB) provides combustion air to the burner. Not all installations re-

quire the LFL to control the CAB. The LFL provides terminals for two options:

LFL output (7) M2, powered after a 2 sec delay, and continues through postpurge.

LFL output (6) M1, powered immediately, and stops prior to postpurge.

The combustion air switch (CAS) is used to prove that combustion air is being provided. Most

burner / boiler insurance codes require a CAS.

Combustion air switch

CAS LFL input (14) COMBUSTION AIR PROVE, is connected to the normally open (NO) terminal

of the CAS, and closes when air pressure is present.

LFL input (13) COMBUSTION AIR TEST SW, is connected to the normally closed (NC) termi-

nal of the CAS, to make sure the contacts have not welded.

The LFL provides options for; interrupted pilot, intermittent pilot, and direct ignition as follows;

LFL output (16) IGNITION, for the ignition transformer

Ignition

LFL output (17) PILOT, for interrupted (pilot on only during ignition), or

for intermittent (pilot on when burner is on)

LFL output (18) MAIN DIR IGN, for the main fuel valve on direct ignition

LFL output (19) MAIN PILOT, for the main fuel valve on piloted ignition

High fire purge inter-

lock

OPEN

Generally, an actuator position switch, or a differential pressure switch, that is used to prove the

actuator is at the high fire position. Some codes require the high fire position (open) be proved

during prepurge.

LFL output (9) OPEN, is provided to drive the actuator to this position. *See Note below

This switch is also, generally, an actuator position switch, that is used to prove the actuator is at

the low position. Some codes require the low fire (minimum) position be proved during ignition.

Low fire start interlock

MINIMUM LFL output (10) MINIMUM, is provided to drive the actuator to this position. *See Note below

This switch is as well, generally another actuator position switch that proves it is at the fully

closed (economy) position. This position is desired following post purge to minimize heat losses.

Fully closed

ECONOMY LFL output (11) ECONOMY, is provided to drive the actuator to this position. *See Note below

*Note LFL input (8) FEEDBACK, is provided to confirm each of these positions.

LFL output (20) RELEASE, enables an external load controlled and/or to indicate “Burner On“

Release to modulate

Flame sensor in

ut LFL inputs (22) (23) (24) FLAME can be used for a UV sensor or flame rod

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Wiring Diagram

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Sequence dial – OPERATION

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Sequence dial – FAULT and LOCKOUT indication

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Program Sequence

ECONOMY (FULLY CLOSED

)

CLOSE (MINIMUM)

MAIN (DIRECT IGNITION)

MAIN (PILOTED)

COMBUSTION AIR BLOWE

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

CLOSE (MINIMUM)

ECONOMY (FULLY CLOSED)

OPEN Modulation

12...

...

MTFI

PTFI IDLE

...

17 PILOT

IGNITION

POSTPURGE

ACTUATOR

9OPEN

PROGRAM SEQUENCE CHART

TART PREPURGE

RequiredINPUT AllowedINPUT

...

POSTPURGE

RESET

ALARM

Output ON (Powered)

NOT AllowedINPUT Output OFF N/A

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