Siting, Installation - Viessmann VITODENS 242-F Technical Manual

Installation accessories
Wall mounting bracket low loss header, type Q100
Part no. ZK03684
With fixing materials
Design information

5.1 Siting, installation

Siting conditions for open flue operation (appliance type B)
Type B and B
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In rooms where air contamination from halogenated hydrocar-
bons may occur, such as hairdressing salons, printing shops, chemi-
cal cleaners, laboratories, etc., operate the Vitodens only as a room
sealed system.
If in doubt, please contact Viessmann.
Never install the Vitodens in areas subject to very dusty conditions.
The installation location must be kept free from frost and must be
adequately ventilated.
Provide a condensate drain and a discharge pipe for the safety valve
in the installation room.
Max. ambient temperature of the system 35 °C.
If these instructions are not observed, any consequential appliance
damage directly related to any of these causes is excluded from our
warranty.
a When installing in Austria, observe all current safety regulations
as defined by ÖVGW-TR Gas (G1), ÖNORM, ÖVGW, ÖVE and
locally applicable standards.
Installation room
Permissible:
■ Boiler installation on the same floor
■ Living space with interconnected room air supply
■ Adjacent rooms with interconnected room air supply (larders,
basements, utility rooms, etc.)
■ Adjacent rooms with vents to the outside:
Ventilation air/extract air 150 cm
and bottom of the same wall
■ Attic rooms, but only with adequate minimum chimney height, acc.
to DIN 18160 – 4 m above inlet (negative pressure operation).
Not permissible:
■ Stairwells and communal hallways. Exception: Detached and two-
family houses of low height (top edge of floor in the top storey
< 7 m above ground level)
■ Bathrooms and toilets without outside windows with shaft ventila-
tion
VITODENS
(cont.)
2 2
or 2 x 75 cm each at the top
■ Rooms where explosive or flammable materials are stored
■ Rooms that are ventilated mechanically or via individual duct sys-
tems to DIN 18117-1
Observe all local fire regulations.
Connection on the flue gas side
The connection piece to the chimney should be as short as possible.
Consequently, position the Vitodens as close as possible to the
chimney.
The flue pipe should be designed to be as straight as possible. If
bends are unavoidable, do not install the bends directly one after
another. It must be possible to test and clean the entire flue gas
path.
No special protective measures or clearances towards combustible
objects, such as furniture, packaging or similar, need to be taken/
observed. The surface temperatures of the Vitodens and the flue
system do not exceed 85 °C at any point.
For flue gas cascades or multiple connections to a single flue
system, install the back draught safety device (available as an
accessory) in every boiler.
For further details, see the technical guide on flue systems for the
Vitodens.
Extractors
When installing appliances with extraction to the outside (cooker
hoods, extractor fans, etc.), ensure that air extraction will not create
negative pressure inside the installation room. A return flow of flue
gases could result if the ventilation system and the Vitodens are
operated simultaneously. In such cases, install an interlock circuit
(see page 45).
Safety equipment for the installation room
Viessmann heat generators are tested and approved in accordance
with all safety regulations and are therefore fail-safe. Unpredictable,
external factors may, in the rarest of cases, lead to the potentially
harmful escape of carbon monoxide (CO). For this case, we recom-
mend using a CO limiter. This can be ordered as a separate acces-
sory.
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VIESMANN
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