Siemens LAL1.25 User manual

CC1N7153en

14.10.2002

Siemens Building Technologies

HVAC Products

ISO 9001

7153

Oil Burner Controls LAL...

Oil burner controls

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

·Flame supervision with

– photoresistive detector QRB1..., or

– blue-flame detector QRC1..., or

– selenium photocell detector RAR...

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 plants

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

LAL4... - Yellow- and blue-flame burners with air pressure supervision

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 should be observed!

Do not open, interfere with or modify the unit!

·Before performing any wiring changes in the connection area of the LAL…, com-

pletely isolate the burner control from the mains supply (all-polar disconnection)

·Ensure protection against electric shock hazard by providing adequate protection

for the burner control’s connection terminals

·Check to ensure that wiring is in an orderly state and that the wires are firmly con-

nected

·Press the lockout reset button / operation 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 damages the lockout relay in the unit

·Fall or shock can adversely affect the safety functions. Such units may not be put

into operation, even if they do not exhibit any damage

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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 manufac-

turer’s documentation

EK2

211 2

1(3)

M1 M2

4 5 67

BV2

BV1

15 16 17 18

2019 9

7153a03/0302

11 10 822

vLP

141213 23

LAL2

12 3 4 5 6 7 8 9 10

QRB1...

22 24

RAR...

SB W

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

Remote reset

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

- 3: For remote reset only

- 1: For remote reset and remote emergency shutdown

With LAL…: Required switching capacity of

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



With LAL2... / LAL3... / LAL4...: 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 «t3» or «t3´»

and that must remain closed until controlled shutdown occurs ®otherwise lockout

Maximum current draw, refer to «Technical data»

«Z» connected to terminal 15 ®«t3´» and «t3n»

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»

Mounting notes

·Ensure that the relevant safety regulations are complied with

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Installation notes

·Installation work must be carried out by qualified staff

·Live and neutral conductors may 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 low-capacitance cable

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

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

tance to the unit and to other cables

Commissioning notes

·Commissioning work must be carried out by qualified staff

·When commissioning the plant or when doing maintenance work, make the follow-

ing safety checks:

Safety check Anticipated response

a) Burner startup with flame detector

darkened

Lockout at the end of «TSA»

b) Burner startup with flame detector

exposed to extraneous 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 this 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 this state

Repetition followed by lockout at the

end of «TSA»

Standards

Conformity to EEC directives

- Electromagnetic compatibility EMC (immunity) 89 / 336 EEC

- Low-voltage directive 73 / 23 EEC

Service notes

·Maintenance work must be carried out by qualified staff

·Each time a unit has been replaced, check to ensure that wiring is in an orderly

state and that the wires are firmly connected

Disposal notes

The unit contains electrical and electronic components and may not be disposed of

together with household 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... / LAL4...:

-Extraneous light does not initiate lockout

– during burner off times

– 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

-Base and plug-in section of the LAL... are designed such that only burner controls

of the LAL... family can be plugged in

-24 connection terminals

-Auxiliary terminals «31» and «32»

-3 earth terminals terminating in a lug for earthing the burner

-3 neutral conductor terminals

– prewired to terminal 2

-14 knockout holes for cable entry by means of cable glands

– 8 at the side

– 6 in the bottom of the base

-6 lateral threaded knockout holes for cable entry glands Pg11 or M20

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 generators Universal use Medium- or heavy-oil

burners

Flame supervision with QRB1... or QRC1... for blue-flame

burners

LAL1.25

LAL4.25A27

Flame supervision with QRB1... or RAR...

Choice of air pressure supervision

Choice of semiautomatic startup

LAL2.14 LAL2.25 LAL2.65

Same as LAL2.25 with the following exception:

No lockout, but prevention of startup in the case of extrane-

ous light

Special applications such

as incinerator plants

LAL3.25

t1 10 s 22.5 s 67.5 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 47.5 s 92.5 s

t10 6 s 10 s 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

LAL...

LAL3.25

Housing

Plug-in base

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Ordering

When ordering, please give full type reference according to «Type summary».

Accessories

Plug-in base

- With Pg11 threads for cable entry glands AGM410490500

- With M16 threads for cable entry glands

GM13.1

Technical data

Mains voltage

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

AC 230 V –15 / +10 %

AC 100 V –15 %...AC 110 V +10 %

Mains frequency 50...60 Hz ±6 %

Unit fuse (built-in) T6,3H250V to DIN EN 60 127

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

Weight

-LAL...

-Plug-in base

approx. 1,000 g

approx. 165 g

Flame detectors:

-QRB1...

-QRC1...

-RAR...

refer to Data Sheet 7714

refer to Data Sheet 7716

refer to Data Sheet 7713

Power consumption approx. AC 3.5 VA

Mounting position optional

Degree of protection IP 40, 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

Degree of protection IP 00

Cable connection screw terminal

cross-sectional area of wire: 0.5...1.5 mm²

With stranded wires use adequate ferrules

Transport DIN EN 60 721-3-2

Climatic conditions class 2K2

Mechanical conditions class 2M2

Temperature range -50...+60 °C

Humidity < 95 % r.h.

Operation DIN EN 60 721-3-3

Climatic conditions class 3K5

Mechanical conditions class 3M2

Temperature range -20...+60 °C

Humidity < 95 % r.h.

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

General unit data LAL...

Plug-in base AGM...

Environmental

conditions

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HVAC Products 14.10.2002

LAL1... with LAL2... / LAL3... with LAL4... with

QRB1... QRC1... QRB1... RAR... QRB1... QRC1...

Min. detector current required

at AC 230 V

95 µA 80 µA 8 µA 6,5 µA 95 µA 80 µA

Max. permissible detector

current with no flame

12 µA 12 µA 0.8 µA 0.7 µA 12 µA 12 µA

Max. detector current that can

occur

160 µA 130 µA 35 µA 30 µA 160 µA 130 µA

Instrument’s +pole To terminal

To terminal

To termi-

nal 22

To terminal 22 To terminal

To termi-

nal 23

Length of detector cable

In the same cable as the

control lines

Max. 30 m --- Not per-

mitted

--- Max. 30 m ---

Separate cable in cable duct Max. 1000 m --- 20 m RAR7...: 30 m Max. 1000 m ---

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

2-core cable for the detector

line (bl, sw); separate single-

core cable for the live con-

ductor (br)

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

Shielded cable (e.g. RG62,

shield insulated)

--- --- 200 m RAR8...: 100 m --- ---

Shield --- --- To termi-

nal 23

--- --- ---

LAL1...

µA DC

QRB1...

7153v01/0498

LAL4... 2322

LAL1...

LAL4...

bl br

µA DC

QRC1...

7153v05/0498

LAL2...

LAL3...

µA DC

QRB1...

7153v02/0498

LAL2...

LAL3...

µA DC

RAR...

7153v03/0498

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

ABCD

t11 t13

t7 t1

t3 t3n

TSA

t3´

7153a09/0498

RLR

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

«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 «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 galvani-

cally 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... / LAL4...:

– 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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HVAC Products 14.10.2002

-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... / LAL4..., 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 ter-

minal 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 preheater’s temperature

With the exception of LAL1...

-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... / LAL4...:

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

Flame supervision

Preconditions for

burner startup

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HVAC Products 14.10.2002

t3´ Long preignition time:

«Z» connected to terminal 15.

With LAL1...:

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

With LAL2... / LAL3... / LAL4...:

«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 posi-

tion 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

TSA Ignition safety time:

On completion of «TSA», a flame signal must be present at terminal 22. It must

be available until controlled shutdown occurs

®otherwise, the burner control will initiate lockout and lock itself in the lockout

position

t3n Postignition time:

-«Z» must be connected to terminal 15

-With short preignition, «Z» remains on until «TSA» has elapsed

®connection to terminal 16

t4 Interval «BV1 – BV2» or «BV1 - LR»:

-On completion of «t4», voltage is present at terminal 19

-The voltage is required to power «BV2» connected to auxiliary switch «v» in

the actuator

t5 Interval:

-On completion of «t5», terminal 20 receives power. At the same time, con-

trol outputs 9 to 11 and input 8 are galvanically separated from the LAL...’s

control section

®LAL... is now protected against reverse voltages from the load control

circuit

-With the release of «LR» at terminal 20, the startup sequence of the LAL...

ends

-After a few idle steps (steps with no contact position changes), the se-

quence switch switches itself off

B Operating position of the burner

B-C Burner operation:

-During burner operation, «LR» drives the air damper to the nominal load or

low-fire position, depending on heat demand

-Release of the nominal load takes place via auxiliary switch «v» in the ac-

tuator

-In the event of loss of flame during operation, the LAL... will initiate lockout

-For automatic start repetition, the clearly marked wire link «B» on the plug-

in section of the LAL... must be cut away

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