Electrical Connection Requirements - Viessmann Vitocal 300-G Pro Installation And Service Instructions For Contractors

Installation sequence
Power supply
(cont.)

Electrical connection requirements

Recommended power cables (minimum values)
Note
■ The power connections must be carried out by an
authorised electrician in accordance with local regu-
lations. The specified cross-sections are "minimum
cross-sections" and are indicative. They apply to
cable laying in empty pipes or ducts at an ambient
temperature of up to 25 °C.
■ If cables are laid in the vicinity of heating pipes or for
cast laying, the cross-sections and max. cable
lengths must be recalculated (on site).
Power circuit (400 V~) on site, control circuit (230 V~) factory-fitted
Type
BW 301.C090, BW 302.C090
BW 301.C120, BW 302.C110
BW 302.C140
BW 302.C180
BW 302.C230
In conjunction with a utility power-OFF and omnipolar shut-off: power circuit (400 V~) and control circuit
(400 V~/230 V~) on site
Type Control circuit (400 V~/230 V~)
MCB/fuse protec-
tion
BW 301.C090
BW 302.C090
BW 301.C120
BW 302.C110
BW 302.C140
BW 302.C180
BW 302.C230
Note
The power supply to the control circuit must be with-
■
out interruption by the power supply utility.
Therefore a separate mains connection for the con-
trol circuit is required in conjunction with omnipolar
shut-off of the power supply (400 V~).
■ A separate power supply for the control circuit
necessitates a change to the internal wiring. This wir-
ing work may only be carried out by an electrical
contractor according to the wiring diagram.
■ The control circuit power supply and the cable for the
power-OFF signal can be combined in a single 5-
core cable.
46
MCB/fuse protection, trunk line
Cable cross-section
25 A
5 x 16 mm
25 A
5 x 16 mm
25 A
5 x 16 mm
25 A
5 x 16 mm
25 A
5 x 16 mm
Cable lengths in the heat pump plus wall clearance
Control circuit power supply (230 V~, if on
site)
Power circuit power supply (400 V~)
Additional connecting cables
Power circuit (400 V~)
Cable cross-section
80 A
100 A
125 A
160 A
200 A
Power circuit (400 V~)
MCB/fuse protection,
trunk line
80 A
2
2 100 A
125 A
2
160 A
2
200 A
2
2
5 x 25 mm
5 x 35 mm 2
5 x 50 mm 2
2
5 x 70 mm
2
5 x 95 mm
Cable cross-section
5 x 25 mm 2
2
5 x 35 mm
2
5 x 50 mm
5 x 70 mm 2
5 x 95 mm 2
3.0 m
2.5 m
2.0 m