Viessmann Vitodens 200 Technical Manual page 139

4.2 Design and sizing information for connection on the flue gas side
Max. total length of the flue pipe up to the flue outlet with flexible flue pipe
Vitodens 200
Rated output range
Max. length
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
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 150 × 150 mm.
VITODENS
kW
m
kW 4.2 13.0
m 10
m
kW
m
For a different number of bends, deduct
from or add to the given max. length 1 m
for 87º bends or 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
10
6.6 26.0 8.7 35.0 12.2 49.0
15 10
4.2 13.0
10
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
15 m.
Consequently, the max. length would be
11 m.
8.8 26.0
15
16.6 66.0
20 15
6.6 26.0
15
4
139