Siemens LGB21.330A27 - Page 15

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Building Technologies CC1N7435en
HVAC Products 11.01.2007
Connection diagrams (cont’d)
LGB21...
1
b1
LP
HS
8N 4
N
I
L
B
a1
A
12
EK2
AL
2
10 3
53
2
76
b2
a2
M
c1
C
R/W
GP
6
11
4
ION
51
0
7435a03/0704
8
IIIII IVI
Z
BV1
LR
7
BV2
M
I
KL
Zu
NL
LKP
t
I
III III
IV IV
II
TSA
t4
t1
9
Si
SB
SQN7...244 / 2-stage control
QRA... with auxiliary unit AGQ1... with LGB21... (diagram 7435a06)
12
2
11
1
7435a06/0704
GP/SB
R/W
L
L
N
QRA
+
-
br
bl
rt
sw
AGQ1
sw bl
Burner without fan and without «LP»
23
11 6
AGK25
7435a04/0398
Burner with fan control via auxiliary contactor («HS») with «LP»
12 2 3
11
6
GP/SB
R/W
L
N
M
HS
AGK25
LP
7435a16/1299
Legend
bl Blue wire
br Brown wire
rt Red wire
sw Black wire