Worcester GB162-65 Installation And Servicing Instruction page 34

INSTALLATION
If you install the room controller (e.g. RC35)
in the boiler, only outdoor temperature-
controlled operation is possible. See the
room controller user manual for further
information.
INSTALLING AND CONNECTING OTHER
CONTROLLERS OUTSIDE THE BOILER
B Install the controller as described in the relevant
installation instructions.
B Connect a RC25 or RC35 room controller or a 4121,
4122 or 4323 cascade controller to the orange RC
terminal using a 2-core cable of 0.75 mm².
This connection is reverse-proof. This
means that it does not matter in which order
the wires are connected.
RC
Fig. 46 Terminal strip – Room controller RC and EMS bus
(connection colour orange)
CONNECTING THE OUTDOOR TEMPERATURE
SENSOR
If outdoor temperature-dependant control operation is
used, an outdoor temperature sensor must be
connected.
B Connect the outdoor temperature sensor to the blue
FA terminal, using a 2-core cable of 0.75 mm².
This connection is non polarity sensitive.
This means that it does not matter which
order the wires are connected.
FA
Fig. 47 Terminal strip - Outdoor-temperature sensor
(connection colour blue)
34
CONNECTING THE POTENTIAL-FREE HEAT DEMAND
B Connect the potential-free heat demand contact to
the green WA terminal (
allowed resistance of this circuit is 100 ohms.
Use a 2-core cable of 0.75 mm².
Fig. 48
6 720 648 726-046.1TD
Fig. 49
6 720 648 726-047.1TD
fig. 48). The maximum
WA
Terminal strip - potential-free heat demand
(connection colour green)
NOTE:
B 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).
B 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.
B This connection is reverse-proof. This
means that it does not matter which
order the wires are connected.
WA
Terminal strip - WA potential-free heat demand
6 720 648 726 (2011/07)
6 720 648 726-048.1TD
6 720 648 726-048.1TD