Electrical Connection; Mains Electrical Connection Of Accessories; Interlock Switch - Viessmann VITODENS 300 Datasheet

Electrical connection

Observe the requirements of your local
electricity supply company and VDE (or
local) regulations when making the mains
power connection.
The mains power cable must be
protected by a fuse with a maximum
rating of 16 A.
Connect the mains (230 V~, 50 Hz) via a
permanent connection.
Connect the supply cables and
accessories at the terminals inside the
boiler.
Mains electrical connection of
accessories
The accessory mains supply 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 mains connection of accessories must
not be carried out at the control unit.
Let cables inside the marked area
(see fig.) protrude 1 200 mm from the
wall.
Use the following cables:
2
NYM J 3 × 1.5 mm for mains power
cables.
NYM with the required number of
conductors for the external connections.
2 core cables for
H External extension H 1 or H 2
H Outside temperature sensor
H Vitotronic 050 (LON)
H Extension kit for heating circuit with
mixer (KM BUS)
H Central fault message (in conjunction
with internal extension)
H Vitotrol 100, type UTD
H Vitotrol 200
H Vitotrol 300.
3 core cable for
H Vitotrol 100, type UTA
H DHW circulation pump
H Mains connection accessories.

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
(accessory) can be used. This switches
the extract fans OFF via the adaptor when
the burner is started.
VITODENS 300
Vitodens 300, 6.6 to 35.0 kW
A
B
100 215
A Reference point Vitodens top edge
B Area for electrical supply cables
Electrical connection
Vitodens 300, from 49.0 kW
B
70
265
A
17