Viessmann Vitodens 200 Technical Manual page 63

Cables
2
NYM J 3 × 1.5 mm 2 core
Power supply cable
(also accessories)
DHW circulation pump
Central fault message
Interlock switch
Install an interlock for open flue operation
if an extraction device (e.g. cooker hood)
is fitted in the room providing the boiler
ventilation.
For this, the internal extension H 2
(accessories) can be used. This switches
the extract fans OFF via the adaptor when
the burner is started.
Power supply for accessories
The power supply for accessories can be
connected directly to the control unit.
This connection is controlled with the
system ON/OFF switch (max. 4 A).
Where the boiler is installed in a wet area,
the connection of the power supply for
accessories must not be carried out at the
control unit.
VITODENS
NYM O 3 core
External extension H1 Vitotrol 100, type UTA
or H2
Outside temperature
sensor
Vitotronic 050 (LON)
Extension kit
for one heating circuit
with mixer
(KM BUS)
Vitotrol 100, type UTD
Vitotrol 200
Vitotrol 300
Radio clock receiver
Additional requirements when
boilers with liquid gas operation are
installed in underground rooms.
According to TRF 1996 volume 2 valid
since the first September 1997 an
external safety solenoid valve is no
longer required when installing the
Vitodens below ground level.
However, the high safety standard
derived from the use of an external safety
solenoid valve has proved to be valuable.
We therefore continue to recommend the
installation of an external safety solenoid
valve plus the internal extension H 1,
when installing the Vitodens in rooms
below ground level (Vitodens 333 and 343
standard delivery).
2.2 Positioning, installation
2
63