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If the BUS links feature different
cross-sections:
B Connect BUS links via a branch box.
2
B
B
B
100 mm
Fig. 10
BUS links connected via branch box (A)
A
2
2
B
B
B
B
B
B
100 mm
Installation (for contractors only) | 15
3.2.2 Connect the analogue 1-2-4 interface
Permissible lead lengths of FR 120 to the heating
appliance:
Lead length
≤ 20 m
≤ 30 m
≥ 30 m
Tab. 7
B Connect the controller to a heating appliance
with optional connections for analogue 1-2-4
interface (24 V DC).
1
1
1
1
FR 120
Fig. 11
Controller connected via the analogue
1-2-4 interface.
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.
Cross-section
2
0.75 mm
– 1.50 mm
2
1.00 mm
– 1.50 mm
2
1.50 mm
DC 24V
2
4
2
4
4
2
2
4
6 720 800 003-04.1O
6 720 800 817 (2012/02)
2
2
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Troubleshooting
