Viessmann vitodens Technical Manual page 118

4.2 Design and sizing information for flue pipe connections
Adapter for system 80/125 to system 60/100 and 70/110
80/125 80/125 80/125 80/125
60/100 60/100 60/100 60/100
Max. total length of the flue pipe
Vitodens 200
Rated output range
Max. length
Vitodens 300 and Vitodens 333
Rated output range
Max. length system size 60
Max. length system size 80
Max. length system size 100
Allowed for: 2 bends of 87º
(incl. support bends)
4
or 3 bends of 45º
and 2.5 m length of union D.
118
Rated output
Balanced flue adaptor
H ∅ 80/125 mm to ∅ 60/100 mm
H ∅ 60/100 mm to ∅ 80/125 mm
H ∅ 80/125 mm to ∅ 70/110 mm
H ∅ 70/110 mm to ∅ 80/125 mm
kW
m
kW 4.5 12.0
m 12
m
m
For any different number of bends,
deduct from/add to the given max. length
1 m for 87º bends or 0.5 m for 45º bends.
For a different length of union D, deduct
or add the difference respectively.
kW
6.6 26.0 8.7 35.0 12.2 49
15 12
Example:
Vitodens 300, 6.6 26.0 kW, with 3 bends 87º
and 3 m length of union D:
Deduct 1 m for the bend and 0.5 m for the
union from the max. flue pipe length of
15 m.
Consequently, the max. length would be
13.5 m.
12 26 35 49 66
System size
∅ mm
60 80
60 80
80
80
8.8 26.0
15
16.6 66
12 12
VITODENS