Viessmann VITOCAL 300-G PRO Installation And Service Instructions Manual page 27

Siting
(cont.)
Type Control circuit
(230 V~)
Cable cross-sec-
tion
BW 302.A150
5 x 2.5 mm
WW 302.A200
BW 302.A180
5 x 2.5 mm
WW 302.A250
BW 302.A250
5 x 2.5 mm
WW 302.A300
Note
■ The control circuit must be supplied
with power without being able to be
interrupted by the power supply utility.
This means a separate power supply
is required for the control circuit.
■ A separate connection for the control
circuit calls for the internal wiring to be
changed. This may only be carried out
by an electrician according to the wir-
ing diagram.
■ The control circuit power supply and
the cable for the power-OFF signal can
be combined in a single 5-core cable.
Cable lengths in the heat pump plus wall clearance:
Type
Control circuit power supply (230 V~, if on-site)
Load circuit power supply (400 V~)
Additional connecting cables
Load circuit (400 V~)
Cable cross-section
2
5 x 50 mm
2
5 x 70 mm
With cable lug for M8
2 5 x 95 mm
With cable lug for M8
Preparing for installation
Max. cable
length
2 40 m
2 40 m
40 m
2
BW
WW
2.5 m
2.5 m
2.0 m
27