Viessmann VITOCAL 222-S Installation And Service Instructions Manual page 46

Installation sequence
Electrical connection
This ensures that, should there
be an error, for example when
detaching a wire, the wires can-
not drift into the adjacent voltage
area.
Note
If two components are connected to the
same terminal, both cores must be
pressed together into a single wire fer-
rule.
46
(cont.)
!
Please note
In terms of safety, the BUS cable
for the internal/external unit
(12 V or 43 V) does not count as
a LV lead.
The BUS cable must be routed
together with the 230 V cables.