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Flue systems
6 720 645 817 (2010/09)
87
Ventilation air/flue gas line
Junkers sets
In balanced flue operation, the fan draws in the required
combustion air from the outside into the gas condensing
boiler. The ventilation air and flue lines are routed in
parallel.
The balanced flue sets have not been system certified.
A calculation to DIN-EN 13384 is required. This can be
performed by Junkers.
For this, the following details are required:
Boiler type
Horizontal length of the flue and number of diversions
Horizontal length of the ventilation air line and
number of diversions
Vertical length of the flue and number of diversions
Chimney shaft size and material
Existing chimney shaft
Generally, a qualified chimney sweep should clean the
chimney if one or more of the following applies:
Combustion air is drawn in via the existing chimney
shaft
Oil or solid fuel combustion equipment has been
connected to the chimney or
Dust loads due to unstable chimney pointing are to be
expected.
Condensate drain from the flue
The flue provides a condensate drain integrated into the
boiler flue connection. The condensate from the flue is
routed directly into the stench trap (siphon) of the gas
condensing boiler.
Inspection apertures
According to DIN 18160-1 and DIN 18160-5, flue systems
for balanced flue operation must be able to be inspected
and cleaned easily and safely. For this, allow for
inspection apertures (Æ Fig. 51).
When arranging the inspection apertures, comply with
the requirements of DIN 18160-5 as well as all locally
applicable building regulations. For this we recommend
contacting your local flue gas inspector [where
appropriate].
The inspection apertures are shown for illustration
purposes only. For more detailed installation
information, see DIN 18160-5.
The air grille cross-sections are calculated according to
one of the following formulae:
Form. 7 Calculating the cross-sections (A) of the air grilles
Fig. 51 Example with the inspection aperture located in a
horizontal flue with diversions in the installation
room
Ventilation (Æ Form. 7)
P Inspection aperture
L Maximum permissible effective height of the flue in m;
calculation according to DIN-EN 13384
Route and, if required, neutralise the
condensate from the gas condensing boiler
or the moisture-resistant flue correctly. For
special engineering information regarding
condensate draining, Æ page 41.
A 150 cm
2
=
A275 cm
2
×=
L
6 720 643 417-21.1O
≤ 2,5 m
P
P
87


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