Installation options for the Vitocrossal flue system
Open flue operation
B
A
A
B
1
2
3
C
A
Flue gas
B
Secondary ventilation
C
Ventilation air
Routing through a shaft (type B
23
to TRGI 2008)
The boiler
1
draws combustion air from the installation room, and
expels flue gas through the flue pipe via the roof (balanced flow).
For a detailed description, see from page 31.
Connection to a moisture-resistant chimney (MR chimney, type
B
23
to TRGI 2008)
The boiler
2
draws combustion air from the installation room and
expels the flue gas through a moisture-resistant chimney via the
roof.
Vertical outlet where no shaft is available (type B
23
to TRGI
2008)
The boiler
3
draws combustion air from the installation room (attic),
and expels flue gas through the flue pipe via the roof.
For a detailed description, see page 34.
Balanced flue operation
B
A
A
B
A
Flue gas
B
Ventilation air
Routing through a shaft (type C
33
to TRGI 2008)
The boiler draws combustion air from the atmosphere through the
annular gap inside the shaft (chimney) and expels the flue gas to the
outside through the flue pipe via the roof.
For a detailed description, see page 36.
Design information
(cont.)
26
VIESMANN
Gas condensing boilers
8
5822 449 GB