Viessmann Vitodens 200 Technical Manual page 136

4.2 Design and sizing information for connection on the flue gas side
Max. total length of the flue pipe to the flue outlet
Vitodens 200
Rated output range
Max. length system size 80
Vitodens 300
Rated output range
Max. length system size 60
Max. length system size 80
Max. length system size 100
Vitodens 333
Rated output range
Max. length system size 80
Vitodens 343
Rated output range
Max. length system size 60
Allowed for: 2 x 87º bends
(incl. support bends)
or 3 x 45º bends,
0.5 m length of union D and an internal
duct dimension of
H 120 × 120 mm at system size 60
H 150 × 150 mm at system size 80
4
H 170 × 170 mm at system size 100.
136
kW
m
kW 4.2 13.0
m 15
m
m
kW
m
kW
m
For a different number of bends, deduct
from or add to the given max. length 1 m
for 87º bends, 0.5 m for 45º bends or 2 m
for inspection tees.
For a different length of union D, deduct
or add twice the difference.
8.8 20.0
13
6.6 26.0 8.7 35.0 12.2 49.0
20 15
4.2 13.0
7
Example:
Vitodens 300, 6.6 kW 26.0 kW, with
3 x 87º bends and 2 m length of union D:
Deduct 1 m for the elbow and 3 m for the
union from the max. flue pipe length of
20 m.
Consequently, the max. length would be
16 m.
8.8 26.0
20
16.6 66.0
20 15
6.6 26.0
20
4.2 13.0
15
VITODENS