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14 | Installation (for contractors only)
3.2
Electrical connections
Connection via BUS interface or
1-2-4 interface:
B To achieve as even a radiator
temperature as possible,
connect the controller via the
2-wire BUS.
The flow temperature is only
heated to a level that allows the
required room temperature to be
reached. This demand-
dependent flow temperature
control is achieved through
longer pump run-on times,
allowing as low a flow
temperature as possible, and
therefore energy saving
operation. This type of control
offers the full range of setting
options and displayed
information.
B To reduce the pump run-on time,
connect the controller via
1-2-4 interface.
Through the output control, the
boiler reacts quickly to changes
in room temperature. This type
of control reduces the range of
setting options and displayed
information. This classic type of
control is highly suitable for
combi boilers in apartments, for
example, because the displays in
these systems are extremely
convenient.
B Use electrical cable according to local codes
and requirements.
B Route all LV cables/leads separately from
cables carrying 220 to 240 V or 380 to 415 V
to avoid inductive interference (minimum
separation 100 mm).
6 720 800 817 (2012/02)
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
stations, microwave ovens etc).
3.2.1 Connecting the BUS link
Permissible lead lengths from the BUS-enabled
Heatronic 3 to the controller:
Lead length
80 m
≤
≤ 100 m
≤ 150 m
≤ 200 m
≤ 300 m
Tab. 6
B Connect the controller to a heating appliance
with BUS-enabled Heatronic 3.
FR 120
ST 19
B
B
Fig. 9
Controller connected to BUS-enabled
Heatronic 3.
Cross-section
2
0.40 mm
2
0.50 mm
2
0.75 mm
2
1.00 mm
2
1.50 mm
Heatronic 3
2
4 B B
A F
1
6 720 800 003-03.1O
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Troubleshooting
