Viessmann vitodens Technical Manual page 102

4.1 Flue gas systems
Flue gas system installation options for balanced flue operation
(no separate ventilation and exhaust air apertures required)
Inside the living area with one or several full floors above
A
B
A
B
A Flue gas
B Ventilation air
A
4
B
A Flue gas
B Ventilation air
A
B
A Flue gas
B Ventilation air
102
B A
Routing through a duct
(type C , according to TRGI '86/96)
63x
The heat generator obtains combustion
air from the atmosphere through the
annular gap inside the duct (chimney) and
exhausts the flue gas via the flue pipe
above roof level. For condensing boilers
> 50 kW, the installation location must be
ventilated even for balanced flue
operation. The duct is not part of the
standard delivery. For a detailed
description, see pages 107 to 111.
Retrofitted ducts
Installation in a subsequently constructed
duct with Building Regulation approval
comprising individual elements (e.g. as
supplied by SIMO or Skoberne) or
mineral profiles (e.g. as supplied by
Promatect).
For a detailed description of ducts, see
page 119.
Outside panel connection
Only with existing system protection
(type C , according to TRGI '86/96)
13x
(permissible up to a rated output of 11 kW
central heating or 28 kW DHW heating)
According to the LandesFeuVo, issue 1999
[Germany], connection via an outside
wall is only permissible in individual
cases where another flue gas outlet is not
appropriate for technical or economical
reasons.
The heat generator obtains combustion
air from the atmosphere via a concentric
dual pipe mounted to the wall and
exhausts flue gas via the outside panel to
atmosphere. For a detailed description,
see page 114.
Horizontal roof terminal
(type C , according to TRGI '86/96)
13x
(no limitation of the rated output)
The heat generator obtains combustion
air from the atmosphere at the roof
dormer via a concentric dual pipe and
exhausts flue gas at the dormer to
atmosphere.
External wall ducting
(type C , according to TRGI '86/96)
53x
The heat generator obtains combustion
air from the atmosphere at the outside
terminal via a horizontal, concentric
coaxial pipe and exhausts flue gas via the
roof to the atmosphere.
In its vertical part, the outside pipe of the
concentric coaxial pipe acts as thermal
insulation because of its static layer of air.
The combustion air is drawn in via the
balanced flue air inlet terminal.
For a detailed description, see page 117.
VITODENS