Viessmann Vitoligno 250-S Installation And Service Instructions For Contractors page 13

Connections on the flue gas side
Note
We recommend you install a flexible connection piece in the flue pipe. This avoids the transmission of sound
caused by the flue gas fan.
Never brick the flue pipe into the chimney.
Note
We recommend installing a draught limiter in the chim-
ney wall.
Fig. 3
Thermal insulation
A
Flexible flue inlet
B
1. Route the flue pipe to the chimney with a rise
(min. 45°).
Max. flue pipe length: 3000 mm
Flue pipe (internal diameter)
40 - 100 kW
120 - 170 kW
2. The entire flue pipe with cleaning aperture must be
gas-tight.
A
B
3. Thermally insulate the flue pipe with fireproof insu-
lation, minimum thickness 30 mm.
Note
If condensate is likely to form inside the chimney, we
recommend you push the flue several centimetres into
200 mm
7
the chimney, ensuring the required minimum cross-
250 mm
7
section of the chimney is maintained.
Installation sequence
13