Viessmann vitodens Technical Manual page 104

4.1 Flue gas systems
Flue gas system installation options for open flue operation
(separate ventilation aperture with a cross-section of 150 cm
Inside the installation location (non living area) with one or several full floors above (compulsory for Vitodens 300 with 66 kW)
A
B
A
B
C
A
4
B
C
Special designs: open flue operation and installation in the living area with combustion air supply
via interconnected rooms (rated output x 35 kW)
A
C B
104
2
or 2 × 75 cm
D
E
2
required)
Routing through a duct
(type B , according to TRGI '86/96)
23
The boiler 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 page 122.
For condensing boilers > 50 kW the
installation location must be ventilated
even for balanced flue operation.
A Flue gas
B Secondary
ventilation
C Ventilation
air
Connection to a moisture resistant
chimney (MR chimney)
(type B , according to TRGI '86/96)
23
The boiler draws combustion air from the
installation room and routes flue gas
through the moisture resistant chimney
via the roof.
For a detailed description, see page 127.
A Flue gas
B Secondary
ventilation
C Ventilation
air
Routing through a duct
or
connection to a moisture resistant chimney
(type B , according to TRGI '86/96)
33
The heat generator draws combustion air
from the installation location via a coaxial
pipe with ventilation apertures upstream
of the duct inlet, and routes the flue gas
A Flue gas either via a flue pipe or via a moisture
B Ventilation resistant chimney through the roof
air (combustion air in connection with
C Secondary ambient air according to TRGI).
ventilation For a detailed description, see page 126.
D Door
E Air
connection
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