Viessmann vitodens Technical Manual page 131

Installation and dimensions
3
b1
4
Flue pipe Flue pipe a
∅ mm ∅ mm
min. mm max. mm
125 700 1 000
150 700 1 000
Install the flue gas header with a slope of
at least 3º.
Given a clearance of 100 mm respectively
between the boilers, the unions between
the boiler and the non-return valve
should be trimmed in accordance with
the dimensions b1 to b4 shown in the
table.
VITODENS
4.2 Design and sizing information for flue pipe connections
2 1
a
b3
b2
min. 100
max. 400
b1 b2
min. mm min. mm
239 276
239 276
The unions between the boilers can be
matched up on site.
d
b4
(max.)
5
1 Flue gas header ∅ 125 or 150 mm
2 Non-return valve ∅ 100
3 End piece with condensate drain
4 Siphon with hose
5 Inspection piece ∅ 125 or 150 mm
6 Ventilation flashing
b3 b4 c
min. mm max. mm min. mm
313 350 200
313 350 200
6
d e
mm mm
250 220
250 240
131
300
4