Open Flue Operation - Viessmann Vitodens 200 Technical Manual

4.1 Flue gas systems
The following requirements regarding
design and installation apply to flue gas
systems for condensing boilers:
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 it is installed (no
transition through separating ceilings).
Here, a differentiation is required as to
whether the condensing boiler should be
installed in the living space (where
persons congregate) or in non-living
quarters (boiler room).
An installation of the Vitodens in the
living space is feasible, subject to the flue
pipe inside the living space being routed
inside a protective pipe and being
surrounded by ventilation air (balanced
flue system, balanced flue operation).
As special case, an installation inside the
living space is also feasible with open
flue operation, provided a union with
secondary ventilation (operation with
room air connection) is provided up to
the duct (see page 158).
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 0342
Vitodens 300 CE 0085 BO 0338
Vitodens 300 ÖVGW G 2.737
(multi-boiler system)
Vitodens 333 CE 0085 BO 0338
Vitodens 343 CE 0085 BO 0338
VITODENS
Structural unit
The aforementioned conditions are
generally met when the flue gas system
(accessories) is used with a CE certified
Vitodens.
The Viessmann balanced flue systems
for balanced flue operation
H Vertical roof outlet,
H External wall terminal,
H Horizontal roof outlet,
H Separate ventilation air and flue gas
routing,
H Routing over external walls inside a
coaxial pipe
are tested together with the Vitodens as
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 For the future, a simplified visual
inspection by the flue gas inspector on
a biennial basis is envisaged
H No additional approval certificate by the
flue pipe manufacturer required
4.1 Flue gas systems
In the non-living space, the flue pipe may
also be routed inside the boiler room
without secondary ventilation. However,
the boiler room must provide a
sufficiently large 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 in excess of 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.
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