Viessmann Vitodens 200 Technical Manual page 132

4.1 Flue gas systems
Several Vitodens boilers in the living space or in occupied rooms (living space rated output x 50 kW)
A
B
A Flue gas
B Ventilation air
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 space) with one or several full floors above (compulsory for the Vitodens 300 with 66 kW)
A
B
A
4
B
C
A
B
C
132
2 2
or 2 × 75 cm required)
A Flue gas
B Secondary
ventilation
C Ventilation
air
A Flue gas
B Secondary
ventilation
C Ventilation
air
Installation on different floors
(type C , according to TRGI '86/96)
43x
Operation with negative pressure:
requires a LAS chimney.
Operation with positive pressure:
Balanced flue system for several
connections.
Several boilers draw combustion air from
the atmosphere via the annular gap of the
LAS chimney and route flue gas to the
atmosphere through a moisture-resistant
internal pipe via the roof. For a detailed
description, see pages 151 and 152.
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 153.
For condensing boilers > 50 kW the
installation location must be ventilated
even for balanced flue operation.
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 159.
VITODENS