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
H
N
L
EK2
AL
211 2
1(3)
3
M1 M2
R
4 5 67
BV2
BV1
Z
SA
15 16 17 18
az
M
2019 9
LR
7153a03/0302
24
m
LK
11 10 822
B
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
A
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
1 A, AC 250 V
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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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
23
To terminal
23
To termi-
nal 22
To terminal 22 To terminal
23
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
--- --- ---
23
LAL1...
22
µA DC
+
QRB1...
7153v01/0498
LAL4... 2322
LAL1...
LAL4...
1
sw
bl br
µA DC
+
QRC1...
7153v05/0498
23
LAL2...
LAL3...
22
+
µA DC
QRB1...
7153v02/0498
24
LAL2...
LAL3...
22
+
µA DC
+
RAR...
7153v03/0498
Flame supervision

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Function
2-stage expanding flame burner Modulating expanding flame burner
FS
BV2
min.
LK 0...
M
R
100%
LR
BV1
M1
M2
Z
~
M
PR
T
t12
t4
t16 t5
ABCD
t11 t13
t6
t7 t1
t3 t3n
TSA
t3´
7153a09/0498
RLR
t5
t11 t12
t13
FS
min.
LK 0...
M100%
RV
A
BV1
M2
Z
~
M
PR
M1
T
t4
t3
t7 t1
TSA
B
t6
CD
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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-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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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