Siemens LGB21.130A17 Datasheet page 15

Connection diagrams (cont'd)
LGB21...
12 2 10 8
EK2
AL
SB
HS
N 8 4
0 I
N L a1
B
SQN7...244 / 2-stage control
Burner without fan and without «LP»
2 3 11 6
AGK25
7435a04/0398
Burner with fan control via auxiliary contactor («HS») with «LP»
12 2 3
GP/SB
HS AGK25 LP
R/W
M
L
N
7435a16/1299
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HVAC Products
3 6 11 4 5
9 7
LP
Z
GP
M
BV1
R/W
BV2
2
1 5 3 7 6
b2
c1
b1 a2
C
A
M
I II III IV
11 6
1
ION
LR
LKP
NL
I
KL III
Zu
II
t1
TSA
t4
QRA... with auxiliary unit AGQ1... with LGB21... (diagram 7435a06)
12 2
GP/SB
R/W
L
br bl rt
L
AGQ1 sw
N
7435a06/0704
QRA
I
IV IV
III
t
11 1
sw
bl
+
-
Legend
bl Blue wire
br Brown wire
rt Red wire
sw Black wire
15/22
CC1N7435en
11.01.2007