Viessmann Vitodens 200 Technical Manual page 146

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 for routing through the duct
Vitodens 200
Rated output range
Max. length
Vitodens 300 up to 35 kW
Rated output range
Max. length system size 60
Max. length system size 80
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,
and 0.5 m length of union C.
4
146
kW
m
kW
m
m
kW
m
kW
m
For a different number of elbows, deduct
from or add to the given max. length 1 m
for 87º elbows or 0.5 m for 45º elbows.
For a different length of
union C, deduct or add the difference.
8.8 20.0
20
4.2 13.0 6.6 26.0
15
20
4.2 13.0
20
Example:
Vitodens 300, 6.6 kW 26.0 kW, with
3 x 87º bends and 2 m length of union C:
Deduct 1 m for the bend and 1.5 m for the
union from the max. flue pipe length of
20 m.
Consequently, the max. length would be
17.5 m.
8.8 26.0
20
8.7 35.0
15
6.6 26.0
20
4.2 13.0
15
VITODENS