Siemens LAL Series User manual

CC1N7153en

22.05.2014

Building Technologies Division

Infrastructure & Cities Sector

7153

Oil Burner Controls LAL...

Oil burner controls

With or without air pressure supervision for checked air damper control

Flame supervision

– with photoresistive detector QRB...

– or blue-flame detector QRC1...

– or silicon photocell detector RAR9...

The LAL... and this Data Sheet are intended for OEMs which integrate the oil

burner controls in their products!

Use

-For the control and supervision of oil atomization burners

-For burners of medium to high capacity

-For intermittent operation (at least one controlled shutdown every 24 hours)

-Can be universally used with multistage or modulating burners

-Suited for use with stationary air heaters

LAL1... - Yellow- and blue-flame burners without air pressure supervision

LAL2... - Yellow-flame burners with air pressure supervision

LAL3.25 - For special applications, e.g. burners of incinerator plant

(for details, refer to «Type summary» and «Notes»)

For burner controls used in connection with burners for continuous operation, refer to

Data Sheet 7785 (LOK16...).

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Warning notes

To avoid injury to persons, damage to property or the environment, the following

warning notes must be observed!

Do not open, interfere with or modify the unit!

All activities (mounting, installation and service work, etc.) must be performed by

qualified staff

Before making any wiring changes in the connection area, completely isolate the

plant from mains supply (all-polar disconnection). Ensure that the plant cannot be

inadvertently switched on again and that it is indeed dead. If not observed, there is

a risk of electric shock hazard

Ensure protection against electric shock hazard by providing adequate protection

for the burner control’s connection terminals

Each time work has been carried out (mounting, installation, service work, etc.),

check to ensure that wiring is in an orderly state and make the safety checks as

described in «Commissioning notes»

Press the lockout reset button only manually (applying a force of no more than 10

N), without using any tools or pointed objects

Do not press the lockout reset button on the unit or the remote reset button for

more than 10 seconds since this will damage the lockout relay in the unit

Fall or shock can adversely affect the safety functions. Such units must not be put

into operation, even if they do not exhibit any damage

Mounting notes

Ensure that the relevant safety regulations are complied with

Installation notes

Always run high-voltage ignition cables separately, with the greatest possible dis-

tance to the unit and to other cables

Live and neutral conductors must not be mixed up

Electrical connection of the flame detector

It is important to achieve practically disturbance-free signal transmission:

Never run the detector cable together with other cables

– Line capacitance reduces the magnitude of the flame signal

– Use a separate cable

Observe the permissible cable lengths (refer to «Technical data»)

Commissioning notes When commissioning the plant or when doing maintenance work, make the following

safety checks:

Safety check to be carried out Anticipated response

a) Burner startup with flame detector darkened Lockout at the end of «TSA»

b) Burner startup with flame detector exposed to extrane-

ous light Lockout after 40 seconds at the latest

c) With wire strap «B»:

Simulation of loss of flame during operation. For that

purpose, darken the flame detector during operation

and maintain that state

Lockout

d) Without wire strap «B»:

Simulation of loss of flame during operation. For that

purpose, darken the flame detector during operation

and maintain that state

Repetition followed by lockout at the end of «TSA»

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Engineering notes

Install switches, fuses, earthing, etc., in compliance with local regulations

Connect valves and other plant components as specified in the burner manufactur-

er’s documentation

EK2

211 2

1(3)

4 5 67

BV2

BV1

15 16 17 18

2019 9

7153a03/0814

11 10 822

vLP

141213 23

LAL2

12 3 4 5 6 7 8 9 10

QRB...

RAR...

Connect safety limit thermostats (manual reset) in the line (e.g. «SB»)

Remote reset

When connecting lockout reset button «EK2» between terminals 21 and

- terminal 3: For remote reset only

- terminal 1: For remote reset and remote emergency shutdown

With LAL1…: Required switching capacity of

- switching devices connected between terminals 4 and 5 (refer to «Technical data»)

With LAL2... / LAL3...: Required switching capacity of

- switching devices connected between terminal 12 and «LP» (refer to «Technical data»)

- «LP» (refer to «Technical data»)

When using series connection, the control contacts of other devices contained in the burner plant must be con-

nected as follows:

- to terminal 4 or 5 contacts that must be closed from startup to controlled shutdown otherwise no startup

or shutdown

- to terminal 12 (not with LAL1...) contacts that must only be closed on startup otherwise no startup

- to terminal 14 (not with LAL1...) contacts that must be closed no later than at the beginning of short

preignition or long preignition and that must remain closed until controlled shutdown occurs

otherwise lockout

Maximum current draw, refer to «Technical data»

«Z» connected to terminal 15 short and long preignition

Connection of «BV...» to terminal 20, refer to «Connection examples»

When using burners without air damper, or with an air damper not controlled and monitored by the LAL…, ter-

minal 8 must be connected to terminal 6

Wire link «B» clearly marked on the underside of the LAL…

When wire link «B» is fitted, the LAL... initiates lockout if loss of flame occurs during operation. For repetition of

the startup sequence, wire link «B» on the plug-in section of the LAL... must be cut away. Just cutting is not

permitted!

For the permissible lengths and laying of detector cables, refer to «Flame supervision»

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Standards and certificates

Conformity to EEC directives

- Electromagnetic compatibility EMC (immunity)

- Low-voltage directive

2004/108/EC

2006/95/EC

ISO 9001: 2008

Cert. 00739 ISO 14001: 2004

Cert. 38233

Certified with plug-in base and flame detector:

Type

LAL1.25 x x x x x x --- ---

LAL2.14 x x x x x x x ---

LAL2.25 x x x x x x x x

LAL2.65 x x x x x x x ---

LAL3.25 x x x --- x x x x

Life cycle Burner controls LAL... has a designed lifetime* of 250,000 burner startup cycles which,

under normal operating conditions in heating mode, correspond to approx. 10 years of

usage (starting from the production date given on the type field).

This lifetime is based on the endurance tests in the standard EN 230.

A summary of the conditions has been published by the European Control Manufactur-

ers Association (Afecor) (www.afecor.org).

The designed lifetime is based on use of the burner controls according to the manufac-

turer’s Data Sheet. After reaching the designed lifetime in terms of the number of burn-

er startup cycles, or the respective time of usage, the burner control is to be replaced

by authorized personnel.

* The designed lifetime is not the warranty time specified in the Terms of Delivery

Disposal notes The unit contains electrical and electronic components and must not be disposed of

together with domestic waste.

Local and currently valid legislation must be observed.

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Mechanical design

-Plug-in design

-Exchangeable unit fuse (including spare fuse)

Difference to LAL1... / LAL2...:

-Extraneous light does not initiate lockout, during burner off times or during the

prepurge time

-Extraneous light prevents burner startup

-Made of impact-proof and heat-resistance black plastic

-Lockout reset button with viewing window; located behind it:

– Lockout warning lamp

– Lockout indicator

- coupled to the spindle of the sequence switch

- visible in the transparent lockout reset button

- uses easy-to-remember symbols to indicate the type of fault and the point

in time lockout occurred

Type summary

Switching times are given in the order of the startup sequence, valid for 50 Hz mains frequency. At 60 Hz frequency, switching times

are about 17 % shorter.

Flash steam genera-

tors Universal use Medium- or heavy-oil

burners

Flame supervision with QRB... or QRC1... for blue-

flame burners LAL1.25 3)

Flame supervision with QRB... or RAR9...

Choice of air pressure supervision

Choice of semiautomatic startup

LAL2.14 3) LAL2.25 3) LAL2.65 3)

Same as LAL2.25 with the following exception:

No lockout, but prevention of startup in the case of

extraneous light

Special applications

such as incinerator

plants

LAL3.25 3)

t1 10 s 22.5 s 66.5 s

TSA 4 s 5 s 5 s

t3 2 s 2.5 s 2.5 s

t3´ From the start ¹)

t3n 10 s 15 s 15 s

t4 8 s 7.5 s 7.5 s

t5 4 s 7.5 s 7,5 s

t6 10 s 15 s 15 s

t7 2 s 2.5 s 2.5 s

t8 30 s 47 s 91 s

t10 6 s 10 s ²) 10 s

t11 Optional

t12 Optional

t13 10 s 15 s 15 s

t16 4 s 5 s 5 s

t20 32 s 35 s 12.5 s

¹) With air pressure supervision: From the time the air pressure signal is received

²) Does not apply to LAL1...

3) Available as AC 100...110 V versions; add type suffix «– 110 V» when ordering

Flame supervision only with QRB or RAR

LAL...

LAL3.25

Housing

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Ordering

Oil burner control, without plug-in base refer to «Type summary»

Plug-in base is not included in standard delivery, must be ordered as a separate item!

Accessories for medium-capacity burner controls refer to Data Sheet N7230

- Plug-in base AGM410490500 with Pg11 thread for cable entry glands

- Plug-in base AGM13.1 with M16 thread for cable entry glands

Flame detectors

- Photoresistive detectors QRB... refer to Data Sheet N7714

- Blue-flame detectors QRC1... refer to Data Sheet N7716

- Silicon photocell detectors RAR9... refer to Data Sheet N7713

Test unit KF8806 for burner controls refer to Manual Document B7987

- For the simulation of faults

- For measuring the pull-in and drop-out values of the flame relay in the case of

flame supervision with QRB... photoresistive detectors

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Technical data Mains voltage

- With LAL1... / LAL2... / LAL3...

C 230 V –15 / +10 %

C 100 V –15 %...AC 110 V +10 %

Mains frequency 50...60 Hz ±6 %

Unit fuse (built-in) T6.3H250V to DIN EN 60127

Primary fuse (external) Max. 10 A (slow)

Weight

pprox. 1,000 g

Power consumption

pprox. AC 3.5 VA

Mounting position Optional

Degree of protection IP40, when fitted, with the exception of the

connection area (terminal base)

Safety class II

Perm. input current at terminal 1 Max. 5 A (peaks of 20 A / 20 ms)

Perm. current rating of control terminals

3, 6, 7, 9...11 and 15...20 Max. 4 A (peaks of 20 A / 20 ms)

Required switching capacity of switching

devices

-Between terminals 4 and 5

-Between terminals 4 and 12

-Between terminals 12 and «LP»

-Between terminals 4 and 14

-«LP»

1 A, AC 250 V

5 A (peaks of 20 A)

5 A

Storage DIN EN 60721-3-1

Climatic conditions Class 1K3

Mechanical conditions Class 1M2

Temperature range -20...+60 °C

Humidity <95 % r.h.

Transport DIN EN 60721-3-2

Climatic conditions Class 2K2

Mechanical conditions Class 2M2

Temperature range -40...+60 °C

Humidity <95 % r.h.

Operation DIN EN 60721-3-3

Climatic conditions Class 3K5

Mechanical conditions Class 3M2

Temperature range -20...+60 °C

Humidity <95 % r.h.

Warning!

Condensation, formation of ice and ingress of water are not permitted!

If this is not observed, there is a risk of loss of safety functions and a risk of

electric shock.

General unit data LAL...

Environmental

conditions

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Technical data (cont´d)

LAL1... with LAL2... * / LAL3... * with

QRB... QRC1... QRB... RAR9...

Min. detector current required at AC 230 V 95 µA 80 µA 8 µA 6,5 µA

Max. permissible detector current with no

flame 12 µA 12 µA 0.8 µA 0.7 µA

Max. detector current that can occur 160 µA 130 µA 35 µA 45 µA

Instrument’s +pole To terminal 23 To terminal 23 To terminal 22 To terminal 22

Length of detector cable

In the same cable as the

control lines Max. 30 m --- Not

permitted ---

Separate cable in cable duct Max. 1000 m --- 20 m 30 m

3-core cable --- Max. 1 m --- ---

2-core cable for the detector line (bl, sw); sep-

arate single-core cable for the live conductor

(br)

--- Max. 20 m --- ---

Shielded cable (e.g. RG62, shield insulated) --- --- 200 m RAR9...: 100 m

Shield --- --- To terminal 23 ---

7153v01/0814

2322 LAL1...

swbl br

µA DC

7153v05/1206

7153v02/0814

* To comply with requirement of EN 230 clause 8.5 «Surge immunity test», for cable

lengths above 10 m appropriate filter elements would have to be used. Experience

has shown that filters are sometimes not necessary for normal operation even for

cable lengths above 10 m.

Flame supervision

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Function

2-stage expanding flame burner Modulating expanding flame burner

BV2

min.

LK 0...

100%

BV1

t12

t16 t5

BCD

t11 t13

t7 t1

t3 t3n

TSA

t3´

7153a09/0498

RLR t5

t11 t12

t13

min.

LK 0...

M100%

BV1

t7 t1

TSA

7153a10/0498

BV... Fuel valve M... Fan or burner motor

FS Flame signal amplifier R Control thermostat or pressurestat

LK Air damper RV Modulating fuel valve

LR Load controller Z Ignition transformer

The following features of the LAL... afford a high level of safety:

-Detector and flame simulation test are restarted on completion of the afterburn time

«t13». Open or not fully closed fuel valves immediately initiate lockout at the end of

afterburn time «t13». The test ends on completion of the prepurge time «t1» of the

next startup sequence

-The correct functioning of the flame supervision circuit is automatically checked

during each burner startup sequence

-The control contacts for the release of fuel are checked to ensure they have not

welded postpurge time «t6»

-A built-in unit fuse protects the control contacts against overloads

-Burner operation with or without postpurge

-Fan motors with a current draw of up to 4 A can be connected directly starting

current max. 20 A (for max. 20 ms)

-Separate control outputs for

– preignition from start command

– postignition until shortly before the burner startup sequence is completed

– short preignition with postignition up to the end of «TSA»

-Separate control outputs for the actuator’s positioning directions «OPEN»,

«CLOSE» and «MIN»

-Checked air damper operation to ensure prepurging with the nominal air volume

-Checked positions:

- «CLOSED» or «MIN» on startup low-fire position

- «OPEN» at the beginning of prepurging

- «MIN» on completion of prepurging

If the actuator does not drive the air damper to the required position, the burner

startup sequence will be stopped

-2 control outputs for the release of the second and third output stage or for load

control

-When load control is enabled, the control outputs for the actuator will be

galvanically separated from the burner control’s control section

-Connection facilities for

– remote lockout warning device

– remote reset

– remote emergency shutdown

-In addition, with LAL2... / LAL3...:

– possibility of air pressure supervision with functional test of the air pressure

monitor on startup

– possibility of semiautomatic burner startup

Legend

General

Control of the burner

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Function (cont´d)

-Flame detector and flame simulation test are made automatically during burner off

times and the prepurge time «t1»

-If loss of flame occurs during operation, the burner control will initiate lockout

-If automatic repetition of the startup sequence is required, the clearly marked wire

link on the plug-in section of the LAL... must be cut away start repetition

-Burner control is not in the lockout position

-Sequence switch is in its start position

with LAL1..., voltage is present at terminals 4 and 11

with LAL2... / LAL3..., voltage is present at terminals 11 and 12

-Air damper is closed

-End switch «z» for the «CLOSED» position must feed power from terminal 11 to

terminal 8

-Contact of the limit thermostat or pressure switch «W» and the contacts of any

other switching devices in the control loop between terminals 4 and 5 must be

closed e.g. a control contact for the oil preheaters temperature

-Normally closed contact of the air pressure switch must be closed «LP» test

Startup sequence

A Start command by «R»

«R» closes the start control loop between terminals 4 and 5

-The sequence switch starts to run

- Only prepurging, fan motor at terminal 6 receives power

- Pre- and postpurging, fan motor or flue gas fan at terminal 7 receives power on completion of «t7»

-On completion of «t16», the control command for opening the air damper is delivered via terminal 9

-Terminal 8 receives no power during the positioning time

-The sequence switch continues to run only after the air damper has fully closed

t1 Prepurge time with air damper fully open

-The correct functioning of the flame supervision circuit is checked during «t1»

-The burner control will initiate lockout if correct functioning is not ensured

With LAL2... / LAL3...:

Shortly after the beginning of «t1», the air pressure switch must change over from terminal 13 to terminal 14

otherwise, the burner control will initiate lockout

start of the air pressure check

t3 Short preignition time

«Z» must be connected to terminal 16, release of fuel via terminal 18.

t3´ Long preignition time

«Z» connected to terminal 15.

With LAL1...

«Z» is switched on when start command is given.

With LAL2... / LAL3...

«Z» is switched on when «LP» changes over.

no later than at the end of «t10»

-On completion of «t1», the LAL... drives the air damper to the low-fire position via terminal 10

the low-fire position is defined by the changeover point of auxiliary switch «m» in the actuator

-During the positioning time, the sequence switch maintains its position

until terminal 8 receives power via «m»

-The motor of the sequence switch is switched to the control section of the LAL...

positioning signals delivered to terminals 8 now have no impact on the further startup sequence and

on subsequent burner operation

Flame supervision

Preconditions for

burner startup

With the exception of LAL1...

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