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Siemens LGA63.191A27 Datasheet

Siemens LGA63.191A27
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9/11
Siemens Building Technologies CC1N7418en
HVAC Products 08.04.2004
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 sequenc-
ing 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 gas 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 gas valve «BV2» receives voltage.
If no flame signal is generated, the flame relay does not open «c - d», so that the bi-
metal 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 gas.
«TZ», however, still receives power so that the bimetal continues to bend until, eventu-
ally, lockout is initiated by «tz2».
EK
1
2
10
8
7
11 9 6 4 5 12
7418i01/0304
SB
W
R
L
N
AL
M
1)
Z
LP
BV1
ION
L1
X
Y
Z
tz2
a
b
fr
TZ
c
d
e
tz1
f
g
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
1) Not monitored to EN 298
Z Ignition transformer
Internal diagram
LGA52... / LGA63...
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Siemens LGA63.191A27 Specifications

General IconGeneral
BrandSiemens
ModelLGA63.191A27
CategoryController
LanguageEnglish

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