46
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
MCB/fuse protection, trunk line
Power circuit (400 V~)
Cable cross-section
BW 301.C090, BW 302.C090
80 A
5 x 25 mm
2
BW 301.C120, BW 302.C110
100 A
5 x 35 mm
2
BW 302.C140
125 A
5 x 50 mm
2
BW 302.C180
160 A
5 x 70 mm
2
BW 302.C230
200 A
5 x 95 mm
2
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~)
Power circuit (400 V~)
MCB/fuse protec-
tion
Cable cross-section
MCB/fuse protection,
trunk line
Cable cross-section
BW 301.C090
BW 302.C090
25 A
5 x 16 mm
2
80 A
5 x 25 mm
2
BW 301.C120
BW 302.C110
25 A
5 x 16 mm
2
100 A
5 x 35 mm
2
BW 302.C140
25 A
5 x 16 mm
2
125 A
5 x 50 mm
2
BW 302.C180
25 A
5 x 16 mm
2
160 A
5 x 70 mm
2
BW 302.C230
25 A
5 x 16 mm
2
200 A
5 x 95 mm
2
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.
Cable lengths in the heat pump plus wall clearance
Control circuit power supply (230 V~, if on
site)
3.0 m
Power circuit power supply (400 V~)
2.5 m
Additional connecting cables
2.0 m
Installation sequence
Power supply
(cont.)
5787 232 GB
Installation
Summary of Contents for BW 301.C090
Page 91: ...91 5787 232 GB...
