Viessmann Vitocal 242-S Installation And Service Instructions Manual page 58

Installation sequence
Electrical connection
Internal unit: AVI PCB
Interface internal unit – external unit
Plug Component
F101 Fuse 1.0 AL (slow)
P202 BUS connection (12 V to external unit for type AWT-AC 241.A10 and
A13)
P203 BUS connection (43 V to external unit for type AWT-AC 241.A04 and
A07)
Note
■ Only one BUS connection should be
connected.
■ Do not interchange the BUS connec-
tion wires between the internal and
external units.
■ Route the BUS connecting cable in the
230 V~ voltage area.
58
(cont.)