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Installation
6720813171 (2016/05)28
Connecting the outdoor temperature sensor
If outdoor temperature-dependant control operation is used, an outdoor
temperature sensor must be connected.
Connect the outdoor temperature sensor to the blue FA terminal,
using a 2-core cable of 0.75 mm².
Fig. 47 Terminal strip - Outdoor-temperature sensor (connection
colour blue)
Connecting the potential-free heat demand
Connect the potential-free heat demand contact to the green WA
terminal ( fig. 48). The maximum allowed resistance of this circuit
is 100 Ω. Use a 2-core cable of 0.75 mm².
Fig. 48 Terminal strip - potential-free heat demand (connection colour
green)
Fig. 49 Terminal strip - WA potential-free heat demand
Connecting the DHW temperature sensor
Connect the DHW temperature sensor to the grey FW terminal, using
the harness enclosed with the DHW temperature sensor [1].
Fig. 50 Terminal strip - potential-free heat demand (connection colour
green)
Connecting an external switch contact
A potential-free external switch contact can be connected. This external
switch contact can be used to safeguard a underfloor heating system so
that the heating water temperature will not become too high etc.
When the external switch contact is opened, the boiler will be switched
off for heating operation and for domestic hot water operation.
The pump continues to run for the run-over time set on the boiler.
Remove the cable from the EV terminal.
Connect the external switch contact to the red EV terminal.
Fig. 51 Terminal strip - external switch contact, potential-free, e. g. for
floor heating (connection colour red)
Connecting external 230 V controls with use of the 230 Volt
converter (only for GB162-50/65)
The gas wall hung boiler condensing can be fitted with the following
external controls:
a room-temperature control device at 230 V connected to the room
control converter (only for GB162-50/65). For connection, see the
electrical wiring diagram supplied with the 230 Volt converter),
ON/OFF temperature controller, Volt free.
This connection is non polarity sensitive. This means that
it does not matter which order the wires are connected.
NOTICE:
It is not possible to connect a thermostat
simultaneously to the RC connection and to the
terminal for the potential-free heat demand (WA)
( fig. 49).
It is possible to operate the boiler with an On/Off
contact for potential-free heat demand, but the room
temperature-based modulating function of the boiler
cannot then be used anymore. This has a negative
effect on comfort and energy consumption. If an On/
Off contact for potential-free heat demand is
installed, the boiler will only modulate up to the
preset CH flow temperature.
This connection is reverse-proof. This means that it
does not matter which order the wires are
connected.
FA
6 720 648 726-047.1TD
WA
6 720 648 726-048.1TD
WA
6 720 648 726-048.1TD
NOTICE:
This connection is reverse-proof. This means that it
does not matter in which order the wires are
connected.
It is not possible to connect more than one DHW
temperature sensor in the boiler. It is only possible to
connect a DHW temperature sensor which is suitable
for this boiler.
This connection is reverse-proof. This means that it does
not matter in which order the wires are connected.
6 720 648 726-050.1TD
1
EV
6 720 648 726-051.1TD
28


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