Viessmann vitodens Technical Manual page 122

4.2 Design and sizing information for flue pipe connections
Plastic (PPs) balanced flue system (BF) for routing through a duct balanced flue operation
(type B according to TRGI '86/96)
Open flue operation requires a flue pipe
as a union between Vitodens and the duct
as well as for routing through the duct.
The installation room must provide a
ventilation aperture with an unobstructed
cross-section of at least 150 cm
2
2 × 75 cm (according to TRGI '86/96).
Please note
Install Vitodens 300, 66 kW and
multi-boiler systems in accordance with
FeuVo in a separate boiler room with a
suitable ventilation air aperture. The
cross-section should be at least 150 cm
2
and should be 2 cm larger for each
additional kW output above 50 kW total
rated output. This cross-section may not
be split over more than 2 apertures
(observe FeuVo and TRGI '86/96
sect. 5.5.4).
Example:
Vitodens 300, 66 kW
2 2
150 cm + 10 × 2 cm = 170 cm
2
2 × 85 cm
Minimum internal duct dimensions
4
System size
A
60
80
80 (flexible,
without unions)
80 (flexible,
with unions)
100
125
150
200
Max. number of bends
H 87º: 3 pieces
H or 45º: 3 pieces
H or 30º: 4 pieces
H or 15º: 4 pieces
122
H Vitodens 12 kW:
Int. dia. flue pipe
H Vitodens 26 to 35 kW:
Int. dia. flue pipe
H Vitodens 300 from 49 kW:
Int. dia. flue pipe
2
or The flue gas system is connected to the
flue outlet.
Combustion air is drawn from the boiler
room via the annular gap in the boiler
adaptor.
For routing through longitudinally
ventilated ducts or channels which
2
meet the requirements for domestic
chimneys to DIN 18160 1 or provide a
fire resistance of 90 minutes (F 90/L 90) or a
fire resistance of 30 minutes (F 30/L 30) for
buildings with a low height.
2
or
Outside diameter Min. internal duct dimension
Coupling
a square
∅ mm mm
173 113
194 135
184 125
100 140
128 170
145 185
184 224
227 267
The annular gap must be at least 3 cm
wide at the duct inlet.
∅ 60 mm
∅ 80 mm
∅ 100 mm
b c
rectangular round
(short side)
mm ∅ mm
113 133
135 155
125 145
140 160
170 190
185 205
224 244
267 287
Prior to installation, the flue gas inspector
should check whether the duct to be used
is suitable and approved for this purpose.
Ducts which were previously connected
to an oil fired or solid fuel boiler must be
thoroughly cleaned by the chimney
sweep. Loose deposits (in particular
sulphur and soot deposits) must not
remain on the inside of the chimney.
Close off and seal any other connection
apertures with appropriate materials.
This does not apply to any cleaning or
test ports, which must be provided with
chimney cleaning covers with the
appropriate test mark.
Check prior to the installation whether the
duct runs straight from top to bottom or
whether it may be offset (check with
mirrors).
If the chimney is offset, we recommend
the installation of a flexible flue pipe
(see page 125).
The local flue gas inspector should check
the system for leaks prior to
commissioning (where applicable).
In the case of open flue operation, this
can only be done by means of a pressure
test.
Inside the installation location, at least
one inspection aperture for checking and
cleaning as well as for checking the
pressure must be provided in the flue gas
system.
If the flue pipe is inaccessible from the
roof, a second inspection aperture must
be provided in the attic behind the
chimney cleaning hatch.
Draining the condensate from the flue
pipe to the boiler must be safeguarded
through a suitable slope of at least 3º.
The flue gas system must protrude clear
of the roof (observe the roof protrusion
parallel to the roof inclination according
to the Landes-FeuVo) (where appropriate).
Alternative flue pipes which have
Building Regulation approval according
to DlBt [Germany] may be used, for
example, if a larger pipe diameter is
required because of greater flue pipe
lengths. In that case, the function
verification to EN 13384 should be
provided by the relevant flue pipe
manufacturer.
VITODENS