Siemens LGA41.153A27 User manual

CC1N7418en
21.06.2016
Building Technologies Division
7418
Gas Burner Controls LGA...
The gas burner controls are used for supervision, startup and control of
atmospheric gas burners of small to medium capacity without a fan in
intermittent operation.
The LGA... and this Data Sheet are intended for use by OEMs which integrate the
gas burner controls in their products.
Use, features
The LGA are designed for startup and supervision of atmospheric gas burners in
intermittent operation. The flame is supervised with an ionization probe.
Burner controls for gas burners and gas units with or without fan
to EN 298: 1994-02 or EN 298: 1993
Undervoltage detection
Air pressure supervision with functional check of the air pressure switch during
startup and operation
LGA41.173A27 and LGA52.171B27 are suitable for use with air heaters.

Note!
Do not use for new designs.

Note!
The following burner controls can be used for new designs:
LME1...
LME2...
LME3...
LME4...
General features
Special features

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Warning notes
To avoid injury to persons, damage to property and 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 appropriate protection
for the burner control’s connections terminals. If this is not observed, there is a risk
of electric shock
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. If this is not observed, there is a risk of loss of
safety functions and a risk of electric shock
Press the lockout reset button / operating button only manually (applying a force of
no more than 10 N), without using any tools or pointed objects. If this is not
observed, there is a risk of loss of safety functions and a risk of electric shock
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.
If this is not observed, there is a risk of loss of safety functions and a risk of electric
shock
Attention!
Earth the burner in compliance with the relevant regulations; earthing the boiler
alone does not suffice!
Mounting notes
Ensure that the relevant national safety regulations are complied with.
The ionization probe and ignition electrode must be positioned so that the ignition spark
cannot arc over to the ionization probe.
Positioning the
ionization probe

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Installation notes
Always run the high-voltage ignition cables separate from the unit and other cables
while observing the greatest possible distances
Make absolutely certain that life and neutral conductors are correctly connected to
terminals 1 and 2 of the burner control; otherwise, no flame signal will be generated
Ensure that the maximum permissible current load for the connecting terminals is
not exceeded (refer to Technical data)
Install switches, fuses, earthing, etc., in compliance with local regulations
The connection diagrams shown apply to burner controls with earthed neutral
conductor. In the case of ionization current supervision in networks with
nonearthed neutral conductor, terminal 2 must be connected to the earth conductor
via an RC unit (part no. ARC 4 668 9066 0). In that case, it must be made certain
that the relevant national safety regulations are complied with (e.g. electric shock
hazard protection), since AC 230 V / 50 Hz mains voltage results in a leakage
current of 2.7 mA
Make certain that the maximum permissible current rating of the connection
terminals will not be exceeded
Do not feed external mains voltage to the control outputs of the unit. When testing
the devices controlled by the burner control (fuel valves, etc.), the LGA… must not
be connected
To isolate the burner control from the mains supply, use an all-polar switch with a
contact gap of at least 3 mm
Secure the earthing lug in the terminal base with a metric screw and a lockwasher
or similar
Switches, fuses, earthing, etc., must be in compliance with local regulations;
primary fuse max. 10 A slow
Connect the gas pressure switch and controller, whose contacts must be closed
from startup to controlled shutdown, in series with control thermostat or
pressurestat (R) and limit thermostat or pressure switch (W)
For safety reasons, feed the neutral conductor to the neutral distributor in the plug-
in base, or to terminal 2. Connect the burner components (fan, ignition transformer
and gas valves) as represented in the figure 7435a14, to the neutral distributor as
shown below. The connection between neutral conductor and terminal 2 is
prewired in the terminal base
Example
237 4 5
M
N
7435a14/0601
ZV1
V2
Key
V... Fuel valve
M fan motor
Z ignition transformer
Correct wiring of neutral conductors!
If the fully closed position of the main valve «BV2» shall be checked on burner
startup, the closed position contact must be included in the loop between terminals
9 and 3. In addition, the connecting links between terminals 9 and 11 and 8 and 3
must be fitted
During the startup sequence, terminal 6 carries voltage and must not be used as
an auxiliary terminal
The auxiliary contact of a gas valve for checking the fully closed position must be
included in the loop between terminals 9 and 3
During the startup sequence, terminals 9 and 6 carry voltage and must not be used
as auxiliary terminals
Connect the load controller of 2-stage burners to terminal 5 in series with «BV2»
Only with LGA41...
Only with LGA52... /
LGA63...

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Electrical connection of ionization probe
It is important to achieve practically disturbance- and loss-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 length of the detector cable (refer to «Technical data»)
The ionization probe and the ignition electrode are 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) and that it
cannot adversely affect the supervision of ionization
With ionization current supervision, the cable length for flame detection must not
exceed 20 m
Insulation resistance
- Must be a minimum of 50 Mbetween ionization probe and ground even after a
large number of operating hours
- Prerequisite for this is not only high quality heat-resistant insulation of the
electrode cable, but also of the ionization probe itself (ceramic holder!)
– Soiled detector holders reduce the insulation resistance, thus supporting
creepage currents
The burner (as the counter-electrode) must be correctly earthed, or else no
ionization current will flow
Since the burner bars form the earthed counter-electrode, the burner must be
adjusted so that the flame is hot and stable and in firm contact with the burner bars.
With pulsating flames or yellow-burning flames resulting from lack of air, a very low
or even no ionization current is generated so that the burner enters malfunction
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 no flame signal; for that purpose, open the
connection between burner control and ionization probe prior
to burner startup and maintain that status
Lockout at the end of «TSA»
b) Burner operation with simulated loss of flame during
operation; for that purpose, open the connection between
burner control and ionization probe during burner operation
and maintain that status
Restart, followed by lockout at the end of «TSA»
c) No air pressure signal during «t1» (only with LGA52... /
LGA63... with auxiliary fan)
No startup
d) Air pressure failure during operation (only with LGA52... /
LGA63... with auxiliary fan)
Shutdown

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Standards and certificates
Applied directives:
Directive for gas-fired appliances 2009/142/EC
Electromagnetic compatibility EMC (immunity) *) 2004/108/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 298:1994
The relevant valid edition of the standards can be found in the declaration of
conformity!
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
Identification code to EN 298
- Single-stage A M C L X N
- 2-stage A T C L X N
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 in the standard EN 298.
A summary of the conditions has been published by the European Control
Manufacturers Association (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 household waste. Local and currently valid legislation must be observed.

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Mechanical design
The gas burner controls are of plug-in design, suitable for installation in any position on
burners, in control cabinets or on control panels.
The housing is made of impact-proof, heat resistant and flame-retarding plastic.
It is of plug-in design (measuring 91 x 62 x 63 mm, including the plug-in base) and
engages audibly in the plug-in base.
The color of plastic material of burner controls LGA are executed in black.
The housing accommodates the ...
- ... the thermal sequencing device (ambient temperature-compensated) acting on a
multiple snap action switching system,
- ... flame signal amplifier with the flame relay
- ... lockout reset button with its integrated signal lamp (splash-proof)
In the event mains voltage drops below about AC 165 V, an electronic circuit ensures
that the gas burner control will prevent burner startup or – without releasing fuel –
lockout will be initiated.
Undervoltage threshold: AC 178 V ±10 V
«TSA»: Smaller tolerance band
Flame signal amplifier: Higher sensitivity, for typical applications with pilot flames
Type summary
The type references given in the table refer to gas burner controls with no base and no
accessories.
For ordering information for plug-in bases and other accessories, see Accessories.
Article no. Type Mains voltage
Burner with undervoltage detection Connection facility for auxiliary fan ¹) Connection facility for air pressure switch Control outputs for gas valves Reversed polarity protection
BPZ:LGA41.153A27 LGA41.153A27
A
C 220...240 V --- ●●2 ●
BPZ:LGA52.150B17 LGA52.150B17
A
C 100...110 V ●2 ●
BPZ:LGA41.173A27 LGA41.173A27
A
C 220...240 V ●2 ●
BPZ:LGA52.150B27 LGA52.150B27
A
C 220...240 V ●2 ●
BPZ:LGA52.171B27 LGA52.171B27
A
C 220...240 V ●●●2 ●
BPZ:LGA63.191A27 LGA63.191A27
A
C 230 V ●●●2 ●
1) Auxiliary fan not monitored to EN 298
Undervoltage detection
Only with
LGA63.191A27

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Accessories (must be ordered separately)
Connection accessories
for small burner controls Plug-in base AGK11…
To connect the small-capacity burner controls to the burner
plant.
See Data Sheet N7201
Cable holders AGK66…
Cable holder for plug-in base AGK11
See Data Sheet N7201
Cable holders AGK65…
Cable holder for plug-in base AGK11
See Data Sheet N7201
Flame detector Ionization probe
Supplied by thirds
Actuators Actuator SQN3...
See Data Sheet N7808
Actuator SQN7...
See Data Sheet N7804
Actuator SQN9...
See Data Sheet N7806
Others RC unit ARC 4 668 9066 0
Article no.: BPZ:ARC466890660
For the supervision of ionization currents in networks with
nonearthed neutral conductor

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Technical data
Mains voltage
- Only with LGA63...
A
C 220 V 15 %...AC 240 V +10 %
A
C 100 V –15 %...AC 110 V +10 %
A
C 230 ±10 %
Mains frequency 50...60 Hz ±6 %
Power consumption 3 VA
Perm. mounting position Optional
Degree of protection IP40 (when integrated)
Safety class I (burner control with plug-in base)
Input current at terminal 1 Max. 5 A
Permissible cable lengths
Detector cable, laid separately
Max. 3 m with 100 pF/m line capacitance
Perm. electrical rating
- Terminal 4 Max. 4 A
- Terminal 5 Max. 1 A
- Terminal 6 Max. 2 A
- Terminal 7 Max. 2 A
- Terminal 8 Max. 4 A
- Terminal 9 Max. 0,1 A
- Terminal 10 Max. 1 A
Cable length terminal 20 m at 100 pF/m
Weight
A
pprox. 180 g
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 -50...+60 °C
Humidity <95 % r.h.
Operation DIN EN 60721-3-3
Climatic conditions Class 3K5
Mechanical conditions Class 3M2
Temperature range 0...+60 °C
For LGA41.173A27 and LGA52.171B27:
-20...+60 °C
Humidity <95 % r.h.
Installation altitude Max. 2,000 m above sea level
Caution!
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
Environmental
conditions

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Flame supervision
At mains voltage UN = AC 230 V
Detector voltage between terminals 1 and
2 or ground
(AC voltmeter Ri 10 M)
UN
Recommended detector current to ensure reliable
operation
Min. 5 µA
Possible detector current in operation Max. 100 µA
Length of detector cable Max. 20 m (separate cable)
Required insulation resistance between
ionization probe with its cable and ground
Min. 50 M
The conductivity and rectifying effect of hot flame gases are used for flame supervision.
For that purpose, AC voltage is applied to the heat-resistant ionization probe which
projects into the flame. The current that flows in the presence of a flame (ionization
current) generates the flame signal which is fed to the input of the flame signal
amplifier. The amplifier is designed so that it only responds to the DC current
component of the flame signal, thereby ensuring that a short-circuit between ionization
probe and ground cannot simulate a flame signal (since AC current would flow in this
case).
Since the ionization current with AC 110 V burner controls is only around half of those
operating on AC 230 V, the detector voltage must be increased with a transformer in
certain cases.
Capacity of transformer: Min. 2 VA
Transforming ratio: Approx. 1.1...1.5
The primary and secondary windings must be galvanically separated.
LN
AC 115 V
LGB2...
12 2
1
AC 127...172 V
7418v03/0716 16
ION
Flame supervision with
ionization probe
Ionization current
supervision with AC 110
V burner controls
Connection of
transformer

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Function
The relevant function diagram shows the required or permissible input signals to the
control section and to the flame supervision circuit hatched (refer to Connection
diagrams).
If these input signals are not present, the burner control will stop the startup sequence to
trigger lockout where required by safety regulations.
Burner control reset
The contacts of the gas pressure switch (GP), the limit thermostat / pressure switch
(W), the control thermostat / pressurestat (R) and safety limit thermostat (SB) must
be closed, heat request
Fan motor (M) connected
Air pressure switch (LP) is in idle position
No undervoltage
Flame detector darkened, no extraneous light
An additional electronic circuit ensures that, if the mains voltage drops below
approximately AC 165 V, the burner startup will be prevented or a lockout will be
triggered.
If the connections of live conductor (terminal 12) and neutral conductor (terminal 2) have
been mixed up, the burner control will initiate lockout at the end of the safety time (TSA).
(Times in seconds) 1)
AC 220...240 V LGA41.153A27 LGA41.173A27 LGA52.150B27 LGA52.171B27 LGA63.191A27
AC 100...110 V --- --- LGA52.150B17 --- ---
t1 Prepurge time --- --- Approx. 13 Approx. 13 Approx. 13
t3 Preignition time 15 15 --- --- ---
t3´ Preignition time from start of «TSA» --- --- Max. 5 4.5...7.5 Max. 10
TSA Ignition safety time 5 10 5 4.5...7.5 10
TSAmax. Max. ignition safety time 10 20 10 20 20
t3n Postignition time Max. 2 Max. 2 --- --- ---
t4 Interval «BV1 – BV2» Approx. 18 Approx. 13 Approx. 18 Approx. 13 Approx. 23
¹) All times specified apply to AC 220 V and AC 110 V respectively
For AC 240 V operations, above times are to be multiplied by 0.7
Startup
Undervoltage detection
Reversed polarity
protection
Control sequence

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Function (cont´d)
If lockout occurs, the outputs for the fuel valves, the burner motor and the ignition
equipment are immediately deactivated (<1 second).
The lockout indication lamp changes to red and voltage is fed to terminal 10 (Alarm) for
remote lockout indication.
This state will also be maintained in the event of power failures.
Cause Response of LGA41... Response of LGA52... / LGA63...
Erroneous flame signal during «t1»
or «t3» (extraneous light)
Lockout ²) prior to the release of gas Lockout ²) prior to ignition and the
release of gas
No flame on completion of «TSA» Lockout ²) Lockout ²)
Loss of flame during operation Repetition Repetition
No air pressure signal during «t1» --- No start
Air pressure failure during operation --- Shutdown
²) After lockout, the burner control can be reset after about 60...90 seconds
After lockout, the LGA will remain locked (lockout cannot be changed).
This state will also be maintained in the event of power failures.
After lockout, the burner control can be reset after 60...90 seconds (also refer to
Warning notes).
The conductivity and rectifying effect of hot flame gases are used for flame supervision.
For that purpose, AC voltage is applied to the ionization probe which projects into the
flame. The current that flows in the presence of a flame (ionization current) generates
the flame signal which is then fed to the input of the flame signal amplifier. The amplifier
is designed such that it only responds to the DC current component of the flame signal,
thus ensuring that a short-circuit between ionization probe and ground cannot simulate
a flame signal (since in that case, AC current would flow).
Control sequence in the
event of fault
Lockout
Resetting the burner
control
Flame supervision with
ionization probe

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Function (cont´d)
When the switch-on command is given, power is supplied to the ignition transformer
and the heating coil of the bimetal sequencing device. The bimetal bends and pushes
contact set «c, d, e» towards «f». On completion of the preignition time, the system tilts
so that «e - f» closes and «f - g» opens, «BV1» receives voltage. Contacts «c - d» still
remain closed («c» resting on «d»). On flame establishment, the flame relay is
energized, latching mechanically «e - f» in the position now assumed. The relay also
closes contact «f» and, at the same time, opens «c - d», so that the ignition transformer
and the bimetal heating element will be switched off. Then, «d» slowly returns to its
starting position, also catching «g». When tilting back, «g - f» closes, so that the main
valve «BV2» will be energized.
If no flame signal is generated, the flame relay does not open «c - d», so that the
bimetal will continue to be heated. The bimetal thus continues to bend until – tilting – it
actuates contact «tz2»: Lockout.
In the event of an erroneous premature flame signal, the flame relay – by means of its
latch – prevents «e - f» from making, which means no release of fuel. «TZ», however,
still receives power so that the bimetal continues to bend until, eventually; lockout is
initiated by «tz2».
EK
1
SB
W
R
L
N
210
AL
91183 76 45 12
Z BV1 BV2
ION
7418i02/0304
LGA41...
L1 tz2
XYZ
ab
fr
TZ
cde
tz1
fg
FR
Si H
AL Fault status signal R Thermostat or pressurestat
BV... Fuel valve SB Safety limit thermostat
EK Lockout reset button Si External primary fuse
ION Ionization probe TZ Electro-thermal timer
FR Flame relay (bimetal system) with contacts «tz»
L1 Built-in lockout warning lamp W Limit thermostat / pressure switch
H Main switch Z Ignition transformer
Internal diagram
LGA41...
Legend

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Function (cont´d)
When the switch-on command is given, the auxiliary fan starts to run. When the air
pressure switch closes its contact, the heating coil of the bimetal sequencing device is
energized and the bimetal pushes contact set «c, d, e» towards «f» (thereby opening «f
- g»). On completion of the prepurge time, «e - f» is closed so that both fuel valve
«BV1» and the ignition transformer receive voltage: The safety time starts. On flame
establishment, the flame relay latches mechanically «e - f», pushes «c» back at the
same time and opens «fr». The ignition transformer is thus switched off and the heating
coil deenergized, so that «d» can revert to its starting position. When tilting back, «g - f»
closes so that the main valve «BV2» receives voltage.
If no flame signal is generated, the flame relay does not open «c - d», so that the
bimetal will continue to be heated. The bimetal thus continues to bend until – tilting – it
actuates contact «tz2»: Lockout
In the event of an erroneous premature flame signal, the flame relay – by means of its
latch – prevents «e - f» from making, which means no release of fuel. «TZ», however,
still receives power so that the bimetal continues to bend until, eventually; lockout is
initiated by «tz2».
EK
1210 8711 9 6 4 5 12
7418i01/0304
SB
W
R
L
N
AL M1) Z
LP
BV1
ION
L1
XYZ
tz2
ab
fr
TZ
cde
tz1
fg
FR
LGA52... / 63...
BV2
Si H
AL Fault status signal H Main switch
BV... Fuel valve M Auxiliary fan
EK Lockout reset button R Thermostat or pressurestat
ION Ionization probe SB Safety limit thermostat
FR Flame relay Si External primary fuse
L1 Built-in lockout warning lamp TZ Electro-thermal timer
LP Air pressure switch (bimetal system) with contacts «tz»
W Limit thermostat
/ pressure switch
1) Not monitored to EN 298 Z Ignition transformer
Internal diagram
LGA52... / LGA63...
Legend

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Connection diagram Program sequence
12 911 837 4 5 106
LGA41...
FR
W
R
L
N
ZAL
ION
7418a04/0304
SB
BV1 BV2
12
Si
H
SB
R/W
Z
BV1
BV2
FS
1
7
4
5
12
t3 t3n
TSA
t4
ABCD
7418f01/0200
12689 11 74510 12
LGA52... / 63...
SB
W
R
L
N
M1)
LP
ZAL
ION
BV1 BV2
FR
7418a05/0304
Si
H
SB
R/W
LP
M
9
6
Z
BV1
BV2
FS
t1 t3´
TSA
t4
1
11
8
9
6
7
4
5
12
AB CD
7418f02/0200
AL Fault status signal M Auxiliary fan
BV... Fuel valve R Thermostat or pressurestat
ION Ionization probe SB Safety limit thermostat
FR Flame relay Si External primary fuse
FS Flame signal W Limit thermostat / pressure switch
LP Air pressure switch Z Ignition transformer
H Main switch
Required input signals 1) Not monitored to EN 298
Burner control’s output signals
A Commencement of startup sequence C Operating position
B Time of flame establishment D Controlled shutdown by «R»
t1 Prepurge t3n Postignition
t3 Preignition time t4 Interval «BV1 – BV2»
t3´ Preignition time from the start of «TSA» TSA Ignition safety time
Legend

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Dimensions
Dimensions in mm
5,5
62,5
88
91
41,5
47
62,5
7418m05/0305
22
9
LGA...
2016 Siemens AG Building Technologies Division, Berliner Ring 23, D-76437 Rastatt
Subject to change
Plug-in base AGK11...