17
Installation (for installers only)
6 720 617 763 (2008/09)
3.2.2 Electrical connection, FW 100 mounted
on the wall
B
Use electrical cable with a minimum rating of
H05 VV-... (NYM-I...).
B
To avoid inductive interference, lay all bus
cables seperately to lines of 230 V or 400 V
(minimum spacing 100 mm).
B
In case of external inductive interference,
shield the cables.
This ensures that the cables are shielded from
external interference (e.g. heavy current
cables, overhead wires, transformer stations,
radio and television set, amateur radio sta-
tions, microwave ovens etc).
Permissible cable lengths from the BUS-enabled
Heatronic 3 to the controller:
Fig. 15
Controller connected to BUS-enabled
Heatronic 3.
Fig. 16
BUS links connected via branch box (A)
Permissible cable lengths to outside temperature
sensor:
Cable length
Cross-section
≤
80 m
0.40 mm
2
≤
100 m
0.50 mm
2
≤
150 m
0.75 mm
2
≤
200 m
1.00 mm
2
≤
300 m
1.50 mm
2
Tab. 5
1
2
4
B B
6 720 613 557-03.1R
ST 19
A F
B
B
AF
FW 100
Heatronic 3
If the BUS cables feature different
cross-sections:
B
Connect BUS link via a branch
box.
Cable length
Cross-section
≤
20 m
0.75 mm
2
... 1.50 mm
2
≤
30 m
1.00 mm
2
... 1.50 mm
2
≥
30 m
1.50 mm
2
Tab. 6
B
2
B
B
A
B
2
B
B
B
2
B
B
6 720 612 220-08.1J
100 mm
100 mm
