Viessmann VITOCAL 300-G Installation And Service Instructions Manual page 220

Connection and wiring diagrams
Overview of the PCBs and connection options
General information regarding the electrical connections
For further information see chapter
"Electrical connection", page 72.
■ The total output of all components con-
nected directly to the control unit (e.g.
pumps, valves, message facilities,
contactors) must not exceed 1000 W.
If the total output ≤ 1000 W, the indi-
vidual rating of a component (e.g.
pump, valve, message facility, contac-
tor) can be greater than specified.
However, never exceed the breaking
capacity of the corresponding relay
(see page 241).
■ In the delivered condition, terminals
may have been pre-allocated (subject
to appliance version).
If two components are connected to
the same terminal, press both cores
together into a single wire ferrule.
220
■ The KM BUS wires are interchangea-
ble.
■ The neutral and earth conductors of all
components are connected to the ter-
minals X2.N and X1.? of the cross
connect PCB.
Note
Only the connections to be made are
shown in the following PCB diagrams.
Pre-allocated connections made at the
factory are explained in the tables.