Viessmann VITOCAL 300-G PRO Installation And Service Instructions Manual page 74

Installation sequence
Power supply
In conjunction with power-OFF: Load circuit (400 V~) and control circuit
(230 V~) on site
Type
BW 301.A090
BW 302.A090
WW 301.A125
WW 302.A125
BW 301.A120
BW 302.A120
WW 301.A155
WW 302.A155
BW 302.A150
WW 302.A200
BW 302.A180
WW 302.A250
BW 302.A250
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
74
(cont.)
Control circuit
(230 V~)
Cable cross-sec-
tion
2
5 x 2.5 mm
2
5 x 2.5 mm
2
5 x 2.5 mm
2
5 x 2.5 mm
2
5 x 2.5 mm
Power circuit (400 V~)
Cable cross-section
2
5 x 25 mm
2
5 x 35 mm
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
Max. cable
length
40 m
40 m
40 m
40 m
40 m
BW
WW
2.5 m
2.5 m
2.0 m