Air/Flue Gas Installation; Flue Gas Connection, Room-Sealed; Flue Gas Connection, Open Flued; Connecting The Boiler To The Flue Gas Pipe - Vaillant ecoCRAFT VKK GB SERIES Installation And Maintenance Instructions Manual

5 Installation
5.6

Air/flue gas installation

In case you use air/flue gas pipes which are licenced to
be used together with the boiler, please observe the en-
closed installation instructions 0020058722.
In case you use customary air/flue gas pipes, please
overserve the following notes:
The flue gas system must be suitable for the flue gas
duct of the boiler (e.g. range oftemperature, pressure
and leak-tightness). The flue gas duct must be labelled
with the CE conformity mark or, if necessary, be certi-
fied according to national standards. The instructions of
the manufacturer of the flue gas ducts must be ob-
served.
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
required 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 re-
quirements concerning the planning, erection and start-
up as well as concerning the maintenance 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!
16
All condensing boilers are fitted with special connection
flanges for connecting condensate secure and over-
pressure leak-tight flue gas pipes.
• For adjusting 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 larg-
er diameter for cleaning the flue pipe, depending upon
the diameter of the pipe.
Note!
h
The user must provide a measurement opening
on the customer side of the flue pipe, externally
to the boiler casing.
Note!
A condensate trap is fitted to the flue gas con-
nection on the boiler to prevent contaminated
condensate 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, which is pro-
duced at a rate of max. 1 kg/m
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 up the boiler, the condensate water
syphon should be filled with water.
Installation and maintenance instructions ecoCRAFT - 0020055744_03
3 , is between 3.5 and 4.5.