Overview Of The Pcbs And Connection Options - Viessmann Vitocal 300-G BW Installation And Service Instructions Manual

Overview of the PCBs and connection options

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
X2
X1
q-O
1
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
q¢Q ON/OFF switch
q¢W External blocking, zero volt con-
tact
q-Q
q-O
N
1
N
2
N'
3
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
Connection and wiring diagrams
X3
q-O
L1
18
L1 F1
17
16
L'
15
14
13
12
11
U
10
P
P
9
8
7
G
6
5
4
3
2
1
F1 q-I
q¢E External demand, zero volt con-
tact
q-W
q-E
q-R
+
q-T
q-Z
q-U
169