Siting Conditions For Room Sealed Operation (Appliance Type C) - Viessmann VITODENS 222-F Technical Manual

Design information
■ 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
■ 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.

Siting conditions for room sealed operation (appliance type C)

Type C , C , C , C , C , C
13x 33x 43x 53x 63x
The Vitodens can be installed for room sealed operation independ-
ent of the size and ventilation of the installation room.
Installation room
Suitable siting locations include:
■ Recreational rooms and other living spaces
■ Ancillary rooms without their own ventilation
■ Cupboards (open at the top)
■ Recesses without compulsory clearance towards combustible
materials
■ Attic rooms (pitched attics and long panes) where the balanced
flue pipe can be routed directly through the roof
The installation room must be safe from the risk of frost.
Provide a condensate drain and a discharge pipe for the safety valve
in the installation room.
Electrical interlocks for extractors (extractor hoods, etc.) are not
required with room sealed operation.
Connection on the flue gas side
The flue pipe should be designed to be as short and straight as pos-
sible.
If bends are unavoidable, do not install them directly one after
another. The entire flue gas path must be able to be checked and
cleaned as required.
Since the flue pipe connection for room sealed operation is surroun-
ded by combustion air (coaxial pipe), no clearances towards com-
bustible materials need be maintained.
VITODENS
(cont.)
2 or 2 x 75 cm 2 each at the top
or C according to TRGI 2008
83x 93x
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 38).
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.
Shafts that were previously connected to oil or solid fuel boilers must
be thoroughly cleaned by a chimney sweep. Loose deposits com-
prising sulphur and soot must not remain on the inside of the chim-
ney. Running a balanced flue pipe through the shaft is then not
required. If thorough cleaning is impossible, if chloride deposits are
present or if the shaft is silted up, use a separate balanced flue pipe
inside the shaft. Alternatively, the ventilation air and flue gas can be
routed separately (on site).
For further details, see the technical guide on flue systems for the
Vitodens.
Installation in a garage
Tests carried out by the Gaswärme-Institut e.V., Essen, have con-
firmed that the Vitodens is suitable for installation in garages.
When installing this boiler in a garage, maintain a clearance between
the floor and the burner of at least 500 mm. Install a frame or deflec-
tor (provided on site) to protect the boiler against mechanical dam-
age.
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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