Viessmann Vitocal 300-G BW, Installation And Service Instructions Manual

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169
Note
No accurate physical layout is shown in any of the following connection diagrams.
For PCB overview, see from page 59.
PCB 1: Message and safety components
1
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
1
2
3
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
X1
X2
X3
P
N
N
N'
L1
L'
L1
q-Q
q-W
q-E
q-R
q-T
q-Z
q-U
U
P
G
F1
q-I
+
q-O
q-O
q-O
F1
q¢Q
ON/OFF switch
q¢W External blocking, zero volt con-
tact
q¢E
External demand, zero volt con-
tact
Connection and wiring diagrams
Overview of the PCBs and connection options
5368 522 UAE
Service