Viessmann VITOCAL 300-G Installation And Service Instructions Manual page 97

Electrical connections
External hook-up
The external components can also be hooked up via "External extension H1".
Installation instructions "External extension H1"
Note
If the components for swimming pool heating are connected to "External extension
H1", no further hook-up (e.g. operating status changeover) can be connected.
■ For PCB locations (terminal and plug
markings), see from page 75.
■ For examples of connecting pumps,
mixers and sensors, see system
examples from page 44.
■ For connections of all pumps and mix-
ers to main PCB with extension, see
page 221.
For connection of all ? and N cables
to cross connect PCB, see page 225
External demand, external mixer "OPEN", operating status changeover
X3.13
A B
X3.12
A Terminals on cross connect PCB
B Zero volt N/O contact outside the
heat pump control unit (on site)
Breaking capacity 230 V~; 2 mA
(cont.)
■ For all sensor connections to the con-
troller and sensor PCB, see
page 228.
■ For parameter settings, see from
page 171.
Installation sequence
97