24
INSTALLATION OF THE VERTICAL AIR/FLUE DUCT
Vertical air/flue duct
Accy. Vaillant Part No.: 303 800
Contents of the accessory:
• Vertical air/flue duct and terminal
assembly
• 48 mm air duct clamp
• Fixing bracket
The air/flue duct assembly may be
connected directly to the flue outlet
on top of the boiler.
In addition to the vertical air/flue
duct and terminal accessory, air/flue
duct extensions can be added to
increase the length of the flue.
Fig. 5.1: Vertical Roof duct
Preparation
• Determine the installation site for
the boiler with reference to the
installation and servicing
instructions supplied with the
boiler.
• Ensure that all installation and
service clearances are available
and that the boiler flue can be
installed as detailed in these
instructions.
• Determine the point where the
vertical air/flue duct and terminal
assembly will penetrate the roof.
Please note: The vertical air/flue duct
and terminal accessory (Accy. No.
303 800) may be shortened. The
outer ‘white’ duct should be
shortened first, then the inner flue
duct cut so that it protrudes 4 mm out
of the air duct. In case of installation
directly to the boiler without elbows
or bends, it is essential that the roof
tile/collar is vertically aligned with
the air/flue duct of the boiler.
48
1285
603
LAS Euro B/S 036/0
Pitched roof
• Determine the point of termination
of the vertical air/flue duct and
terminal assembly. Install the
adjustable pitched roof tile (
1, fig.
5.2
) in position.
• Fit the adjustable hood over the
roof tile according to the roof
pitch. The adjustable hood is
suitable for roof pitches from 25°
to 35°, or 35° to 45° by
reversing.
Flat roof
• Determine the point of termination
of the vertical air/flue duct and
terminal assembly.
• Make a hole in the roof of
120 mm diameter. Secure the flat
roof collar (
1, fig. 5.2
) to the roof
covering above the hole in
accordance with the codes of
practice for flat roofs (CP 144) to
ensure a
watertight seal.
Pitched and flat roof
installations
• From above insert the air/flue
duct and terminal assembly (
5
)
into the adjustable roof tile
(pitched roof) or roof penetration
collar (flat roof) until it is fully
seated. Adjust the vertical
alignment of the air/flue duct and
terminal assembly and secure the
air duct with the fixing bracket
provided (
6
).
• At this stage it is necessary to
prepare and fit the boiler onto the
hanging bracket – refer to the
boiler installation instructions.
• If the installation requires the use
of air/flue duct extensions,
additional bends or elbows please
refer to the sections on pages
25 – 27.
