Viessmann VITOCAL 300-G Installation And Service Instructions Manual page 225

Overview of the PCBs and connection options
Cross connect PCB (message and safety connections)
X2
1
X1
2
1 3
N
?
N
?
N
?
N
?
N
?
N
?
N
?
N
?
N
?
N
?
N
?
N
?
N
?
N
?
N
?
N
?
?
?
F1 Fuse 6.3 A (slow)
X1 Terminals X1.? for earth conduc-
tors of all components
X2 Terminals X2.N for neutral conduc-
tors of all components
1/N/PE
230V / 50 Hz
N L1
?
X3
N L1
N' L'
P
F1
X3 ■ Power supply terminals of the
Connection and wiring diagrams
(cont.)
18
F1
17
16
15
14
13
12
11
10
+
P
9
8
G
7
6
5
4
3
2
1
control unit "L1" and auxiliary
components
■ Switched phase L1:
X3.1, X3.2, X3.3, X3.7, X3.11,
X3.13
■ Terminals for message and safety
connections
225