Viessmann Vitodens 200 Technical Manual page 137

4.2 Design and sizing information for connection on the flue gas side
Vitodens in conjunction with solid fuel boilers
Routing the flue pipe in a twin-draught duct
It may be possible to route the plastic flue pipe with the flue pipe of a solid fuel boiler in a twin-draught chimney, if
H the annular gap required for secondary
ventilation/combustion air supply is
maintained (see page 134), and the solid
fuel boiler flue provides a downdraught
pipe with a super-elevation of 2 × D, but
in any case a minimum of 400 mm.
D
C
D
B A
A Vitodens flue pipe
B Flue pipe for solid fuel boilers
C Downdraught pipe
D Ventilation/secondary air
VITODENS
or
H the flue pipe terminal and the duct
cover are made from non-combustible
material (e.g. aluminium), and the
length inside the duct is
approx. 300 mm and above the duct
end approx. 2 × D flue pipe.
The aluminium terminal pipe and the
duct cover are available as accessories.
Basic duct set for:
System size 60
part no. 7190 197
System size 80
part no. 7190 198
System size 100
part no. 7190 199
We recommend this version with
segregation for open and balanced flue
operations. Never reduce the length of
the terminal piece.
D
C
B A
A Vitodens flue pipe
B Chimney for solid fuel boilers
C Separator made from
non-combustible material
D Terminal piece made from
non-combustible material
E Duct cover (on site)
or
Hthe thickness of the tabs of the full-wall
breeze blocks is at least 50 mm (see
diagram). Since flue gas from the solid
fuel boiler can be drawn in, we can only
recommend open flue operation for this
version.
E
E
B A
>50 mm
A Vitodens flue pipe
B Chimney for solid fuel boilers
C Terminal piece of the plastic flue pipe
D Duct cover
E Ventilation/secondary air
F Full-wall breeze block chimney with a
tab thickness of > 50 mm
C
D
4
F
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