Positioning, Installation; H Installation Conditions For Open Flue Operation - Viessmann vitodens Technical Manual

Installation conditions for open flue operation (boiler type B)
In rooms where air contamination
through halogenated hydrocarbons may
occur, such as through hairdressing
salons, printing shops, chemical cleaners,
laboratories, etc., Vitodens for open flue
operation (types B and B ) may only be
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installed if adequate measures can be
taken to provide a supply of
uncontaminated combustion air.
If in doubt, please contact us.
Boilers should not be installed in areas
subject to very dusty conditions.
The boiler location must be kept free
from frost and must be adequately
ventilated.
Provide a condensate drain and a
blow-off line for the safety valve in the
boiler room.
The maximum ambient temperature of
the system should not exceed 35 ºC.
If these instructions are not observed, any
consequential losses directly related to
any of these causes are excluded from
our warranty.
Vitodens 300 with 66 kW
Install Vitodens 300 with 66 kW in
accordance with local regulations in a
separate boiler room. Fit the mains
electrical isolator outside the installation
room.
Combustion air apertures
Gas fired boilers with a total rated output
greater than 50 kW may only be provided
with combustion air apertures leading to
the outside. The cross-section should be
2
at least 150 cm , and should be 2 cm
larger for each additional kW output
above 50 kW rated output. This
cross-section may not be split over more
than 2 apertures (observe FeuVo and
TRGI '86/96 point 5.5.4 or local
regulations).
Example: Vitodens 300, 4 × 66 kW
Total rated output 264 kW
2 2
150 cm + 190 × 2 cm = 530 cm
2
2 × 265 cm .
The combustion air apertures should be
2 2
at least 530 cm or 2 × 265 cm .
Multi-boiler systems with pressurised
flue gas systems
Vitodens 300, 49 to 66 kW
The Vitodens 300 multi-boiler systems
with common pressurised flue gas
systems are provided for open flue
operation (type B).
Further details on page 128.
VITODENS
Boiler room (up to 50 kW)
Permissible:
H Boiler positioning on the same floor
H Living area with connected air supply
(up to 35 kW)
H Adjacent rooms with connected airways
(larders, basement, utility rooms, etc.)
H Adjacent rooms with apertures to the
outside (ventilation air/flue gas 150 cm
or each with 2 × 75 cm
bottom of the same wall, up to 35 kW)
H Attic rooms, but only with adequate
minimum chimney height to
DIN 18160 4 m above inlet
operation.
Not permissible:
H Stair wells and common hallways.
Exception: Detached and two family
homes of low height (top edge of the
floor in the top floor < 7 m above
ground level)
H Bathrooms and toilets without outside
windows with duct ventilation
H Rooms in which explosive or flammable
materials are stored
H Rooms which are ventilated
mechanically or via individual duct
systems to DIN 18117 1.
Observe all local regulations.
2
2
or

2.2 Positioning, installation

Operation of Vitodens in wet areas
Vitodens is approved for installation in
wet areas (e.g. bath or shower rooms)
(
protection IP X4 D, splash-proof).
When installing Vitodens in wet areas,
observe the safety areas and minimum
wall clearances according to VDE 0100 or
local regulations (see also electrical
2
protection range on page 49). Vitodens
2
at the top and may be installed in protection area 1.
draught Flue gas connection
(for further details, see page 99)
The connection pipe to the chimney
should be as short as possible. Therefore,
position Vitodens as closely to the
chimney as possible.
No special requirements regarding
protective measures and clearances
towards combustible objects, e.g.
furniture, cartons or similar, need to be
applied.
Vitodens and the flue pipe system do not
exceed a surface temperature of 85 ºC at
any part.
Extraction devices
When installing devices with exhaust to
the outside (cooker hoods, extraction
devices etc.) please note that extraction
of air should not be able to create a
vacuum in the boiler room.
A return flow of flue gases could result if
the ventilation system and Vitodens were
operating simultaneously. In such cases
an interlock circuit must be installed.
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.
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