Viessmann Vitocal 350-A Installation And Service Instructions Manual page 206

Connection and wiring diagrams
Overview of the PCBs and connection options
Signalling and safety components on PCB 1 (cross connect
PCB)
X1
1
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The following terminals carry a switched
phase L1:
■ 1X3.1
■ 1X3.2
206
X2
1
N
2
3
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
X3
L1
N L1
N' L'
F1
■ 1X3.3
■ 1X3.7
■ 1X3.11
■ 1X3.13
(cont.)
18
F1
17
16
15
14
13
12
11
U
10
9
8
G
7
6
5
4
3
2
1