5.6 Air/flue
gas
installation
Should you use air/flue gas pipes which are licensed to
be used together with the boiler, please observe the en-
closed installation instructions 0020058722.
Should you use conventional air/flue gas pipes, please
note the following:
The flue gas system must be suitable for the flue gas
duct of the boiler (e.g. temperature, pressure and leak-
tightness classification). The flue gas duct must be la-
belled with the CE conformity mark or, if necessary, be
certified according to national standards. The instruc-
tions of the manufacturer of the flue gas ducts must be
observed.
The dimensioning of the flue gas system must be car-
ried out according to EN 13384-1 (EN 13384-1 - Chimneys
- Thermal and fluid dynamic calculation methods -
Part 2: Chimneys serving one heating appliance). The re-
quired device parameters are listed in table 12.1.
a
Caution!
The diameter of the flue gas pipe must at least
be equal to the diameter of the flue gas spigot
of the boiler. A reduction is not permitted.
Furthermore the valid type standards concerning flue
gas systems must be observed.
The respective type standard determines conditions and
safety-related requirements concerning the planning,
erection and start-up as well as concerning the mainte-
nance of flue gas systems.
5.6.1
Flue gas connection, room-sealed
The combustion air is fed to the boiler via ducting from
the outside. The boiler room must be constructed as
stated in BS 6644.
5.6.2 Flue gas connection, open flued
h
Note!
Ensure that the horizontal section of the flue
gas pipe is run with a downward slope towards
the boiler!
The combustion air is taken from the installation room.
The ventilation openings in the installation room must
be in accordance with the relevant regulations (con-
densing boilers Type B).
5.7
Connecting the boiler to the flue gas pipe
h
Note
Ensure that the horizontal section of the flue
gas pipe is run with a downward slope towards
the boiler!
All condensing boilers are fitted with special connection
flanges for connecting condensate secure and over-
pressure leak-tight flue gas pipes.
• For adjustment purposes, the flue pipe must be fitted
with a cleaning opening having a diameter of at least
100 mm. It may be necessary to have openings of
larger diameter for cleaning the flue pipe, depending
upon the diameter of the pipe.
h
Note
The user must provide a measurement opening
in the flue pipe on site, external to the boiler
casing.
Note
There is a condensate trap installed at the flue
connection of the boiler which prevents con-
taminated condensed water from getting into
the boiler. The drain of this condensate trap is
connected to the siphon on the boiler.
• If required, fit the flue gas line with the flue gas safety
temperature limiter which is provided as an accessory.
The flue pipe must be approved for use at a tempera-
ture of at least 120 °C.
5.8 Condensate
discharge
The pH value of the flue gas condensate lies between
3.5 and 4.5.
The condensate does not contain any prohibited heavy
metal ions.
The boiler is fitted with a condensate collector and a
condensate discharge with siphon. The condensate aris-
ing from the combustion is either fed directly via the si-
phon into the drain channel or first neutralised and then
fed into the drain.
• Before starting the boiler up, the condensate water si-
phon should be filled with water.
15
Installation and maintenance instructions ecoCRAFT 0020055744_08
Installation 5
