The following requirements regarding design and installation apply to
flue systems for condensing combustion equipment:
Prior to starting work on the flue system, your heating contractor
should confer with the flue gas inspector responsible [where
applicable].
Combustion equipment must be connected to the domestic chimney
stack on the same floor as the one on which it is installed (no transition
through separating ceilings).
We recommend installation in a separate room.
Structural unit
The aforementioned conditions are generally met when one of the flue
systems (accessories) listed below is used.
The following Viessmann balanced flue systems for balanced flue
operation are tested to DVGW [standard] as a single technical unit
with the Vitoladens, similar to gas condensing boilers:
■ Vertical roof outlets
■ Separate ventilation air and flue gas routing
■ External routing through a coaxial pipe
Advantages of single structural units:
■ No calculated performance verification for flue pipes to DIN
EN 13384 is required for individual cases
■ According to the Landesbauordnung, some Federal States (e.g.
North Rhine-Westphalia) do not require a tightness test to be carried
out during commissioning by the flue gas inspector [check local reg-
ulations]
■ Envisaged for the future is a simplified visual inspection by the flue
gas inspector on a biennial basis
■ No additional approval certificate by the flue pipe manufacturer is
required
The flue pipe may also be routed through the installation room with-
out secondary ventilation. However, the installation room must then
provide a vent to the outside of at least 150 cm
2
or 2 × 75 cm
2
.
The plain flue pipe must be type approved by the Deutsche Institut für
Bautechnik (DIBt) [Germany] (open flue operation).
The flue available as an accessory is CE-designated and approved in
accordance with DIN EN 14471.
System certification
System certification similar to DVGW-VP 113 and EC Gas Appliances
Directive 90/396/EEC in conjunction with PPs flue pipes offered by
Skoberne:
■ Vitoladens 300-C: CE-0035BS104
■ Vitoladens 300-T: CE-0035BO107
■ Vitoladens 300-W: CE-0035BM112
■ Vitoladens 333-F: CE-0035BM112
■ Vitorondens 200-T: CE-0035CL102
■ Vitorondens 222-F: CE-0035CL102
General building approval:
Approval certificate Z-43.11-153
1.2 Balanced flue operation
The Vitoladens and Vitorondens are suitable for balanced flue oper-
ation.
Vitorondens 200-T from 63 kW can only operate in open flue mode.
The Vitoladens 300-W and 333-F are categorised as C
33x
, C
53x
, C
63x
or C
83x
.
The Vitoladens 300-C, Vitoladens 300-T, Vitorondens 200-T up to
54 kW and Vitorondens 222-F are categorised as appliances type
C
53
, C
63
or C
83
.
In accordance with TRÖI 2009, a joint approval for the Vitoladens,
Vitorondens and the balanced flue system applies to this type of equip-
ment.
For balanced flue systems tested together with the boiler, some
authorities waive the requirement for a tightness test (overpressure
test) during commissioning by the flue gas inspector and the verifica-
tion of CE designation.
If this applies, we recommend that your heating engineer carries out
a simple tightness test during the commissioning of your system. For
this it is sufficient to check the CO
2
concentration in the combustion air
at the annular gap of the balanced flue pipe. The flue is considered
sufficiently gas-tight if the CO
2
concentration in the combustion air is
no higher than 0.2 %, or if the O
2
concentration is at least 20.6 %. If
higher CO
2
or lower O
2
values are captured, check the flue system for
tightness.
In conjunction with the concentric coaxial pipe (balanced flue system),
the surface temperature of the boiler or that of the balanced flue sys-
tem will never exceed 85 ºC. Therefore, clearances to combustible
components according to TRÖI are not required.
The CE-designated flues from the Viessmann range can be used in
equipment type C
63
.
Use a condensate trap above the boiler flue connection if an aluminium
flue pipe is installed. Install the connecting lines with a fall of at least
3° to the boiler.
The balanced flue system is CE-designated and approved in accord-
ance with DIN EN 14471 (see page 6).
If installing the boiler in a basement or on a lower floor, an existing
chimney or shaft of sufficient size may be used for routing the balanced
flue pipe.
According to TRÖI 2009, flue pipes that bridge several floors must be
routed inside a shaft with a fire rating of at least 90 minutes, and for
buildings in categories 1 and 2, a fire rating of at least 30 minutes.
The balanced flue gas/ventilation air is routed in a balanced flue pipe
up to the chimney or shaft. The flue pipe is routed inside the chimney
or shaft to above roof level.
Where no suitable shaft is available, the flue may be routed to the roof
through a retrofitted shaft. For this shaft, a Building Regulations test
certificate or a CE designation corresponding to the design of the shaft
is required. In addition, the shaft must have a fire rating of L30 or
L90.
1.3 Open flue operation (type B23)
Flue gas is routed through single wall plastic pipes (PPs). The flue
system is CE-designated and approved in accordance with EN 14471
(see page 6).
Supplying combustion air:
Flue systems
4
VIESMANN
VITOLADENS, VITORONDENS
1
5822 452 GB
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