Siemens LFL1.148 User manual

CC1N7454en
20.11.2017
Building Technologies Division
7454
Gas Burner Control LFL1.148
Gas burner control
for atmospheric gas burners in intermittent operation
flame supervision with ionization probe
The LFL1.148 and this Data Sheet are intended for use by OEMs which integrate
the burner controls in their products!
Use
For the supervision of 1- or 2-stage atmospheric gas burners
For use with medium- to high-capacity burners
For intermittent operation (at least 1 controlled shutdown in 24 hours)
The gas burner has a connection facility for an auxiliary fan or flue gas fan (e.g. for
condensing boilers)
Flame supervision is ensured by means of an ionization probe, 1 electrode is used for the
first stage and 1 for the second stage. Changeover takes place automatically after
release of the second fuel valve.

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Supplementary documentation
Product type Type of documentation Documentation number
LFL... Data sheet N7451
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
For safety reasons – self-test of the flame supervision circuit, etc. – at least
one controlled shutdown must take place every 24 hours
Before performing any wiring changes in the connection area of the LFL1.148,
completely isolate the unit from the mains supply (all-polar disconnection)
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 (do not apply a force of more than 10 N)
without using any tools or pointed objects
Do not press the lockout reset button on the unit or the remote lockout reset button
for more than 10 seconds since this would damage the lockout relay inside 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 national safety regulations are complied with
Connect the earthing lug inside the terminal base to burner ground using a screw
with a lockwasher or similar
Installation notes
Always run the high-voltage ignition cables separately while observing the greatest
possible distance to the unit and to other cables
Do not mix up live and neutral conductors
Electrical connection of the ionization probe
It is important to achieve practically disturbance- and loss-free signal transmission:
Never run the ionization cable together with other cables
– Line capacitance reduces the magnitude of the flame signal
– Use a separate cable of low capacitance
The ionization probe is not protected against electric shock hazard
Locate the ignition electrode and the ionization probe such that the ignition spark
cannot arc over to the ionization probe (risk of electrical overloads)

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Commissioning notes
Prior to commissioning, check to ensure that wiring is in an orderly state
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 ionization cable
disconnected
Lockout at the end of safety time
(TSA)
Standards and certificates
Applied directives:
Low-voltage directive 2014/35/EC
Directive for gas-fired appliances 2009/142/EC
Directive for pressure devices 2014/68/EC
Electromagnetic compatibility EMC (immunity) *) 2014/30/EC
*) The compliance with EMC emission requirements must be checked after the burner control is
installed in equipment
Compliance with the regulations of the applied directives is verified by the adherence to
the following standards / regulations:
Automatic burner control systems for burners and
appliances burning gaseous or liquid fuels
DIN EN 298
Safety and control devices for gas burners and gas burning
appliances
DIN EN 13611
Automatic electrical controls for household and similar use
Part 2-5: Particular requirements for automatic electrical
burner control systems
DIN EN 60730-2-5
The relevant valid edition of the standards can be found in the declaration of
conformity!
Note on DIN EN 60335-2-102
Household and similar electrical appliances - Safety - Part 2-102:
Particular requirements for gas, oil and solid-fuel burning appliances having electrical
connections. The electrical connections of the LFL1.148 and the AGM comply with the
requirements of EN 60335-2-102.
EAC Conformity mark (Eurasian Conformity mark)
ISO 9001:2008
ISO 14001:2004
OHSAS 18001:2007
China RoHS
Hazardous substances table:
http://www.siemens.com/download?A6V10883536
Certified complete with plug-in base:

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Life cycle
Burner controls 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 specified in standard EN 298 and the table containing the relevant test
documentation as published by the European Association of Component Manufacturers
(Afecor) (www.afecor.org).
The designed lifetime is based on use of the burner controls according to the
manufacturer’s Data Sheet. After reaching the designed lifetime in terms of the number of
burner 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.
Mechanical design
The mechanical design of the LFL1.148 corresponds to that of the standard units of the
LFL range (refer to Data Sheet N7451).

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Type summary
The type reference given below apply to the LFL1.148 without plug-in base and without
flame detector. For ordering information for plug-in bases and other accessories, see
Accessories.
Gas burner control, without plug-in base LFL1.148
Article no.: BPZ:LFL1.148
Plug-in base not included in the delivery, must be ordered as a separate item!
Accessories (to be ordered separately)
Flame detector Ionization probe
To be supplied by thirds
Connection accessories
for medium-capacity
burner controls
Plug-in base AGM410490550 with Pg11 threads for cable
entry glands.
Article no.: BPZ:AGM410490550
Refer to Data Sheet N7230
Plug-in base AGM14.1 with M16 threads for cable entry
glands.
Article no.: BPZ:AGM14.1
Refer to Data Sheet N7230

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Technical data
For technical data – with the exception of the data listed below and the switching times of
the switching mechanism – refer to Data Sheet N7451.
Perm. length of detector cable
Normal cable, laid separately Max. 50 m
Shielded cable, shielding connected to
terminal 22, e.g. high-frequency cable
Max. 100 m
Capacity
Output on startup (without fan
assistance)
A
ny (with ignition < 120 kW)
Nominal output
A
ny
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 60 721-3-2
Climatic conditions Class 2K2
Mechanical conditions Class 2M2
Temperature range -40...+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.
Installation altitude Max. 2,000 m above sea level
Warning!
Condensation, formation of ice and ingress of water are not permitted!
If not observed, there is a risk of impairment of safety functions and of
electric shock hazard.
General unit data
Environmental
conditions

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Function
In terms of control program and flame supervision (including test of the flame supervision
circuit), the functions of the LFL1.148 correspond of those of the standard units of the
LFL range.
There is a difference however in the control of actuator (SA) and of load controller (LR),
especially with regard to the air damper position on startup and closing of the air damper
during controlled shutdown.
Supervision of the respective start position is accomplished via an auxiliary switch in the
damper actuator whose contact must be included in the start control loop between
terminals 4 and 5.
It must be ensured that the current path between terminals 4 and 5 remains closed until
controlled shutdown takes place.
During controlled shutdown, the air damper is driven to the fully closed position via
contact (Vlb) of the switching mechanism.
Since the switching mechanism of the burner control does not continue to run until
changeover of limit switch (z) in the air damper actuator occurs, the running time of
actuator (SA) is optional.
The pilot flame is supervised by ionization probe (ION1), the main flame by ionization
probe (ION2).
Warning!
On completion of the ignition safety time (TSA), a flame signal must be present
at terminal 23 (ION1). On completion of the second safety time (t9), a flame
signal must also be present at terminal 24 (ION2).

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Control program
In the event of fault and lockout indication:
◄No start
For example: Start control loop interrupted via actuator (SA)
Lockout due to a fault in the flame supervision circuit
▼Abortion of startup sequence because the auxiliary switch in actuator (SA) has
cut the start control loop
1 Lockout, because no flame signal was present on completion of the ignition
safety time (TSA)
2 Lockout because no flame signal was present on completion of the second
safety time
▌Lockout because the flame signal was lost during burner operation
◄Lockout on completion of the control program, due to extraneous light or a faulty
flame signal
For example: Flame not extinguished
After the reset, the burner control’s switching mechanism first returns to the start position
and then initiates a burner restart.
Connection diagram
12 321 4125146 8
(7)
16 18 19 11 15 22 23 24
H
L
N
AL
EK2 W
R
GP M1 ZBV1 BV2
ION1
ION2
7454a04/0204
LFL1.148
SB
Si
Connection examples
54121520 11 68
W
R
LP
7454a02/1195
2-stage forced draft gas burner without
load controller (LR) and without actuator
(SA)
W
R
5 4 12 8 6 14 15 20 11
7454a03/1195
Atmospheric gas burner without fan
assistance, load controller (LR) and
actuator (SA)

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Basic diagram
LH
1
AS
br1
ar1 IXV ar2
ION2
22 23 24
76
12
4
W
x
yR
LP
d1
d2
513 14
N
M1 M2
d1 d2
22 23 24
ION1
X
fr1
XI XIII XII
AR
br2
L1
EK1
BR
321 216
AL
NH
EK2
1
910 18 19
ZBV1 BV2
1L
N
Y1
15 20 11 8
6
B1
M
Q
LK
xy
SA
azm
M
Y2
LR
E
A
M
a
bb
a
abba
ab
b
aab
fr3
NTC
fr2 FR V
(1) (1)
ab
XIV IV
VII
ab
ar3
V
IX
VI
ab
M
~
SM
VIII
IIIII
bb a
a
7454a01/0204
SB

Si
Warning!
Do not press reset bottom (EK) for more than 10 seconds!
Control program
SB/
R/W
M1
Z
BV1
BV2
FS1
FS2
ABCD
t1 t6
t7 t3 t20
TSA t9
t4 t5
t8 7454d02/0204
1
6
7
16
18
19
23
24

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Diagram of switching mechanism
t1 t3 t6
t7 t4 t5
t8
t10
TSA
t9
t20
ABC
D
a
b
a
b
a
b
a
b
a
b
a
b
XV
XIV
XIII
XII
XI
X
IX
VIII
VII
VI
V
IV
III
II
I
7454d01/0204
a
b
19 16
910
20 11
8
18
15
23 24
12 7
7
12
a
b
a
b
a
b
a
a
a
a
b
Legend
AL Remote lockout indication Alarm Output signals of burner control
AS Unit fuse Required input signals
AR Main relay with contacts «ar...» Working relay
BR Lockout relay with contacts «br...» A Start command given by the control thermostat
BVx Fuel valve A-B Startup sequence
d1/d2 Contactor or relay B Operating position of burner
EKx Reset button B-C Burner operation
IONx Ionization probe C Controlled shutdown by control thermostat or pressurestat (R)
FR Flame relay with contacts «fr...» C-D Sequence mechanism runs to the end position after a
GP Gas pressure switch controlled shutdown by control thermostat or pressurestat (R)
H Main isolator D End position of burner Corresponding to the start position
L1 Lockout warning lamp
LK Air damper Switching times in seconds
LP Air pressure switch
LR Load controller TSA Ignition safety time 4 s
M1/M2 Fan or burner motor t1 Waiting time or prepurge time 14 s
NTC NTC resistor t3 Preignition time 2 s
R Control thermostat or pressurestat t4 Interval fuel valve (BV1-BV2) 8 s
SA Air damper actuator t5 Interval between release of the 2nd fuel valve and the load
a: Changeover limit switch for actuator’s OPEN position controller (if present) 10 s
z: Changeover limit switch for actuator’s CLOSED position t6 Postpurge time 10 s
SB Safety limit thermostat t7 Interval until voltage at terminal 7 is present 2 s
Si External primary fuse t8 Duration of startup program 36 s
SM Synchronous motor of sequence mechanism t9 2nd safety time for 2nd stage 8 s
V Flame signal amplifier t10 Interval until air pressure check is started 6 s
(1) Input for forced energizing of the flame relay during the t20 Steps of switching mechanism with no change in the 26 s
functional test of the flame supervision circuit program Idle steps
(contact «XIV») and during safety time (TSA) (contact
«IV»)
W Limit thermostat or pressure switch
Z Ignition transformer

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Dimensions
Dimensions in mm
1,5
108,5
27,5 27,5
37
7,5
103
7454m04/0305
123
LFL1.148
2017 Siemens AG Building Technologies Division, Berliner Ring 23, D-76437 Rastatt
Subject to change!
Plug-in base AGM410490550 /
AGM14.1