1.1 Flue systems
The following requirements regarding design and installation apply to
flue systems for condensing combustion equipment:
Prior to starting work on the flue system, your heating contrac-
tor should confer with the responsible flue gas inspector
[where applicable].
Gas combustion equipment must be connected to the domestic
chimney on the same floor where it is installed (no transition through
separating ceilings).
Here, differentiation is required as to whether the condensing boiler
should be installed in the living space (occupied rooms) or in the
non-living space (installation room).
Siting the Vitodens in the living space is feasible, subject to the flue
inside the living space being routed inside a protective pipe and
being surrounded by ventilation air (balanced flue system, room
sealed operation).
As a special case, installation in the living space is also feasible for
open flue operation, provided a connection piece with secondary
ventilation up to the shaft (operation with interconnected room air
supply) is provided (see page 40).
System certification
System certification to Gas Appliances Regulation 2016/426/EU in
conjunction with PPs flues from Skoberne
Vitodens 100-W CE-0063CQ3356
Vitodens 111-W CE-0063CQ3356
Vitodens 200-W CE-0085CN0050
Vitodens 222-F CE-0085CN0050
Vitodens 222-W CE-0085CN0050
Vitodens 242-F CE-0085CN0050
Vitodens 300-W
Vitosolar 300-F with Vitodens 300-W
CE-0085CM0463
Vitodens 333-F CE-0085CM0463
Vitodens 343-F CE-0085CM0463
The aforementioned conditions are generally met with the flue sys-
tems (accessories) that are CE designated together with the
Vitodens.
The following Viessmann balanced flue systems for room sealed
operation are tested to DVGW and CE designated with the Vitodens:
■ Vertical roof outlet
■ External wall connection
■ Horizontal roof outlet
■ External routing through a coaxial pipe
Benefits:
■ No calculated performance verification for flues to EN 13384 is
required in individual cases
■ Simplified visual inspection by the local flue gas inspector every 2
years
■ No additional approval certificate by the flue pipe manufacturer is
required
In non-living space, the flue pipe in the installation room may also
be routed without secondary ventilation. However, in that case the
installation room would require an adequately sized ventilation air
aperture to the outside (according to TRGI 2008).
Rated heating output up to 50 kW:
150 cm
2
or 2 × 75 cm
2
Rated heating output above 50 kW (e.g. Vitodens 200-W from 60 kW
or multi boiler system):
150 cm
2
plus 2 cm
2
for each kW above 50 kW
a
The country-specific regulations (which may include the TR
Gas and ÖVGW guidelines) apply to the installation of this
appliance.
The plain flue pipe must be type approved by the Deutsches Institut
für Bautechnik (DIBt) [Germany] (open flue operation).
The flue available as an accessory is CE designated and approved
in accordance with EN 14471.
1.2 Room sealed operation
The sealed combustion chamber of Vitodens gas condensing boilers
enables their use in room sealed operation. These boilers are cate-
gorised as equipment type C
13x
, C
33x
, C
14(3)x
, C
53x
, C
63x
, C
83x
or C
93x
according to CEN/TR 1749 ("x" only applies to DE).
A joint approval for the Vitodens and balanced flue system applies
to this type of equipment (except for C
63x
).
The tightness test (overpressure test) by the flue gas inspector dur-
ing commissioning as well as the verification of the "General Building
Regulations approval" by the DIBt may be omitted for this type of
construction.
The combustion air is supplied and the flue gas extracted through
one concentric coaxial pipe (balanced flue system). The combustion
air is supplied through the annular gap between the external alumi-
nium ventilation air pipe and the flue. Flue gases are extracted
through the internal plastic pipe (PPs).
For balanced flue systems tested together with the wall mounted gas
boiler, there is no requirement for a tightness test (positive pressure
test) during commissioning by the flue gas inspector.
In this case, we recommend that your heating contractor carries out
a simple tightness test during the commissioning of your system. For
this it would be sufficient to check the CO
2
concentration in the com-
bustion air at the annular gap of the balanced flue pipe. The flue pipe
is deemed to be gas-tight if the CO
2
concentration in the combustion
air is no higher than 0.2 % or the O
2
concentration is at least 20.6 %.
If higher CO
2
or lower O
2
values are established, check the flue sys-
tem for tightness by pressure testing.
The flue pipe should be designed as short and straight as possible.
If bends are unavoidable, do not install them directly one after
another. It must be possible to test and clean the entire flue gas path
as required.
In accordance with the FeuVO [check local fire regulations], a venti-
lation air aperture is required in the installation room for a total rated
heating output of 100 kW or more. This also applies to types that
have been tested for tightness (
...x
).
In conjunction with the concentric coaxial pipe (balanced flue sys-
tem), the surface temperature of the Vitodens and that of the bal-
anced flue system do not exceed 85 °C at any point. Therefore,
clearances to combustible components according to TRGI are not
required.
Every approved flue system can be used for type C
63x
. These flue
systems are not tested together with the boilers and do not have
system certification in accordance with the Gas Appliances Regula-
tion 2016/426/EC. If used, the Viessmann stipulations with regard to
siting conditions and sizing (diameter, maximum flue lengths) must
be adhered to.
Install the connection pipes (horizontal routing) with a fall of at
least 3° (approx. 50 mm/m) to the boiler. In addition, we recommend
using fixing clamps spaced about 1 m apart to support/suspend the
connection line.
The balanced flue system is CE designated and approved in accord-
ance with EN 14471 (see page 6).
Flue systems
4
VIESMANN
VITODENS, VITOSOLAR
1
5414641
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