Viessmann Vitodens 200 Technical Manual page 153

4.2 Design and sizing information for connection on the flue gas side
Plastic (PPs) open flue system (BF) for routing through a duct open flue operation
(type B according to TRGI '86/96)
Open flue operation requires a flue pipe
as union between the Vitodens and the
duct as well as for the 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).
Note
Install the Vitodens 300, 66 kW and
multi-boiler systems in accordance with
FeuVo [or local regulations] in a separate
boiler room with a suitable ventilation
aperture. The cross-section should be at
2
least 150 cm and should be 2 cm
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 item 5.5.4 (or local
regulations).
Example:
Vitodens 300, 66 kW
2 2 2
150 cm + 10 × 2 cm = 170 cm
2
2 × 85 cm
Minimum internal duct dimensions
System size Outside diameter
A Coupling
60
80
80 (flexible,
w/o unions)
80 (flexible,
with unions)
100
100 (flexible,
w/o unions)
100 (flexible,
with unions)
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
VITODENS
H Vitodens 300, 13 kW and 343:
Int. dia. flue pipe
H Vitodens 200, Vitodens 300, 26 kW to
35 kW and Vitodens 333:
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 flue
outlet.
For routing through longitudinally
ventilated ducts and channels, which
meet the requirements laid down for
2
larger
domestic chimneys in accordance with
DIN 18160 1 or which offer a fire
resistance of 90 minutes (F 90/L 90) or a
fire resistance of 30 minutes (F 30/L 30) for
low buildings.
or
Min. internal duct dimension
b
a square rectangular
(short side)
∅ mm mm
173 113
194 135
184 125
100 140
128 170
110 150
125 165
145 185
184 224
227 267
The annular gap must be at least 3 cm
wide at the duct inlet.
Prior to installation, the flue gas inspector
∅ 60 mm should check whether the duct to be used
is suitable and approved for this purpose.
Ducts which were previously connected
∅ 80 mm to an oil fired or solid fuel boiler must be
thoroughly cleaned by the chimney
∅ 100 mm 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 if
it is offset (check with mirrors).
If the chimney is offset, we recommend
the installation of a flexible flue pipe (see
page 156).
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) [or local
c
regulations].
round
Alternative flue pipes which have
mm ∅ mm
Building Regulation approval may be
113 133
used, for example, if a larger pipe
135 155
diameter is required because of greater
125 145
flue pipe lengths. In that case, the
function verification to EN 13384 should
140 160
be provided by the relevant flue pipe
manufacturer.
170 190
150 170
165 185
185 205
224 244
267 287
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