Flue Gas Systems; H Balanced Flue Operation - Viessmann vitodens Technical Manual

4.1 Flue gas systems

The following requirements regarding
design and installation apply to flue gas
systems for gas fired condensing
combustion equipment:
Prior to work on the flue gas system, your
heating contractor should confer with the
responsible flue gas inspector [where
applicable].
It is recommended that the participation
of the flue gas inspector is recorded on
the appropriate form, available from the
local planning office (where applicable).
Gas fired combustion equipment must be
connected to the chimney stack on the
same floor as where they are installed (no
transition through separating ceilings).
Here, a differentiation is required as to
whether the condensing boiler should be
installed in the living area (where people
congregate) or in non-living area (boiler
room).
An installation of Vitodens in the living
area is feasible, subject to the flue pipe
inside the living area being routed inside
a protective pipe and being surrounded
by ventilation air (balanced flue system,
balanced flue operation).
As a special case, an installation inside
the living area is also feasible with open
flue operation, so long as a union with
secondary ventilation (operation with
room air connection) is provided up to
the duct (see page 126).
System certification
System certification to DVGW VP 113 and
EC Gas Equipment Directive 90/396/EEC
in conjunction with PPs flue pipes offered
by Skoberne
Vitodens 200 CE 0085 BO 0338
Vitodens 300 CE 0085 BO 0342
Vitodens 300 ÖVGW G 2.737
(multi-boiler system)
Vitodens 333 CE 0085 BO 0338
VITODENS
Structural unit
The aforementioned conditions are
generally met when the flue gas system
(accessory), which is jointly CE certified,
is used.
Viessmann balanced flue systems for
balanced flue operation,
H vertical roof terminal,
H external wall terminal,
H horizontal roof terminal,
H separate ventilation and flue gas pipes,
H outside panel outlet as dual pipe design
are tested together with Vitodens as
one structural unit in accordance with
DVGW and CE designated.
Advantages of one structural unit:
H No calculated verification of flue pipe
function to EN 13384 is required for
individual cases
H According to the Landesbauordnung,
some Federal States (e.g.
Northrhein-Westphalia) do not require a
leak test to be carried out during
commissioning by the flue gas
inspector
H For the future, a simplified visual
inspection by the flue gas inspector on
a bi-annual basis is envisaged
H No additional approval certificate by the
flue pipe manufacturer required
4.1 Flue gas systems
In the non-living area, the flue pipe may
also be routed inside the boiler room
without secondary ventilation. However,
the boiler room must provide an
adequately sized ventilation aperture to
the atmosphere (according to
TRGI '86/96).
Rated output up to 50 kW:
2 2
150 cm or 2 × 75 cm
Rated output above 50 kW (e.g.
Vitodens 300, 66 kW, or multi-boiler
system):
2 2
150 cm and 2 cm for each kW above
50 kW
The plain flue pipe must be type
approved by the Deutschen Institut für
Bautechnik (DIBt) [Germany] (open flue
operation).
The flue pipe available as an accessory
has been approved with
certificate Z 7.2 1104 and Z 7.2 3028.
4
99