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Flue systems
6 720 645 817 (2010/09)
79
11.2.2 Ventilation air/flue gas line
Junkers sets
The flue that is part of the Junkers set is made from
plastic. It is installed as a complete pipe system or as a
connection piece between the gas condensing boiler
and a moisture-resistant chimney.
Combustion air supply
In open flue mode, the fan of the gas condensing boiler
draws the required combustion air from the installation
room.
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 open flue operation must be able to be inspected and
cleaned easily and safely. For this, allow for inspection
apertures (Æ Fig. 46 and Fig. 47).
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. 6 Calculating the cross-sections (A) of the air grilles
A Cross-section, air grille
P
Kessel
Boiler output
Fig. 46 Example with the inspection aperture located in a
horizontal flue without diversions in the
installation room
L Maximum permissible effective height of the flue
P Inspection aperture
ZL Ventilation air (Æ Form. 6)
Fig. 47 Example with the inspection aperture located in a
horizontal flue with diversions in the installation
room
HL Secondary ventilation
L Maximum permissible effective height of the flue
P Inspection aperture
ZL Ventilation air (Æ Form. 6)
Route and, if required, neutralise the
condensate from the gas condensing boiler
and the flue or the moisture-resistant flue
correctly. Special engineering information
regarding draining the condensate
Æ page 41.
A 2 75 cm×
2
2P
Kessel
50 kW()× 1 cm
2
×+=
A150 cm
2
P
Kessel
50 kW()2 cm
2
×+=
6 720 643 417-16.1O
≤ 1,5 m
P
P
ZL
L
ZL
HL
L
6 720 643 417-17.1O
≤ 2,5 m
P
P
79


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