6 720 800 817 (2012/02)
Installation (for contractors only)
|
15
Fig. 10
BUS links connected via branch box (A)
3.2.2 Connect the analogue 1-2-4 interface
Permissible lead lengths of FR 120 to the heating
appliance:
B
Connect the controller to a heating appliance
with optional connections for analogue 1-2-4
interface (24 V DC).
Fig. 11
Controller connected via the analogue
1-2-4 interface.
If the BUS links feature different
cross-sections:
B
Connect BUS links via a branch box.
B
2
B
B
A
B
2
B
B
B
2
B
B
6 720 612 220-08.1J
100 mm
100 mm
Lead 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. 7
The third contact enables the
controller to recognise that it is not
connected via the BUS link but
instead via the analogue
1-2-4 interface.
6 720 800 003-04.1O
FR 120
1
2
4
1
2
4
1
2
4
1
2
4
DC 24V
