28 Air/flue pipe installation manual 0020308120_02
5.9.4 Connecting the product
1. Install the product (7) – see the installation instructions
for the product.
2. Connect the 87° elbow (1) to the connector for the
air/flue pipe (6).
3. Fit the sliding sleeve (3) with the sleeve as far as it will
go onto the wall duct (4) or the extension (5).
4. If required, install the extensions .
5. Connect the sliding sleeve to the 87° elbow.
6. Install the air pipe clamp (2) for the sliding sleeve.
7.
Alternatives :
Condition: Wall duct with extension
▶ Connect all of the pipe joints with air pipe clamps.
(→ Page 54)
5.9.5 Variable terminal set (VTK), (article
number 303942 / …46)
5.9.5.1 Minimum clearances for the flue gas terminal
You must comply with the minimum clearances for the flue
gas terminal that are defined in BS 5440, unless the boiler's
manufacturer has given approval to use shorter minimum
clearances that are not considered to be safety-critical.
Vaillant has reduced the minimum clearances for the flue
gas terminal and specifies this in the installation instructions
for the boiler. These are minimum clearances that are to be
used for all types of installation, except for the installation of
the variable terminal set (VTK).
If a variable terminal set is connected to horizontal flue pipe-
work, terminal clearances are reduced for the air inlet. The
terminal clearances on the "new" flue outlet at the end of
VTK remain unchanged.
On the VTK, the minimum clearances for the air inlet A, B
and C (→ Installation instructions for the boiler) to openings
(e.g. a window) are reduced to 150 mm. This means that
the terminal will be at the horizontal flue pipework when a
variable terminal set is connected to the air inlet and can
therefore be installed at a clearance of less than 300 mm
from a window opening or a ventilation tile.
5.9.5.2 Scope of delivery
1 Variable terminal
2 87° elbow with bird-
guard grille
3 Extension (2 x 1 m)
4 Pipe clamps (3 x)
– Variable terminal set, black (article number 303942)
Variable terminal set, white (article number 303946)
– Variable terminal
– Extension 1 m (2 pcs)
– Pipe clamps (3 pcs)
– 87° elbow with bird-guard grille
Note
Component 1 is not required for the installation.
5.9.5.3 Installing the variable terminal
1. If required, before starting the installation work, decom-
mission the boiler and secure it against being inadvert-
ently started up again.
2. Remove the wall duct from the terminal.
3. Use an 8 mm screwdriver to press the latching lugs
inwards.
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