13
Reduction in maximum flue length for each bend
Reduction for bends
Bend
45° bend
90° bend
1.0 metre
1.0 metre
Reduction for bends
Bend
Reduction in maximum flue length for each bend
45° bend
90° bend
0.5 metre
1.0 metre
Vertical flue terminal and accessories
Part No.
Description
Min-Max length
530
531
532
523
524
525
526
527
528
529
Vertical flue terminal
Pitched roof flashing plate
Flat roof flashing plate
90-degree bend
45-degree bends (pair)
500mm extension
1000mm extension
2000mm extension
Telescopic extension
Wall bracket pack (5)
1000 mm
N/A
N/A
N/A
N/A
500mm
1000 mm
2000 mm
350/730mm
208mm
Using the dimensions given in fig. 9 as a reference, mark
and cut a 115mm hole in the ceiling and/or roof.
Fit the appropriate flashing plate to the roof and insert the
vertical flue terminal through the flashing plate from the
outside, ensuring that the collar on the flue terminal fits
over the flashing.
The fixing holes for the wall-mounting bracket should now
be drilled and plugged, an appropriate type and quantity of
fixing should be used to ensure that the bracket is mounted
securely. Once the bracket has been secured to the wall,
mount the appliance onto the bracket.
IMPORTANT
The vertical flue terminal is 1.0 metre in length and cannot
be cut; therefore it may be necessary to adjust the height
of the appliance to suit or use a suitable extension.
Connect the vertical flue assembly to the boiler flue spigot
using the 100mm clip, gasket & screws (supplied), ensuring
the correct seal is made. The flue support bracket (supplied
with the vertical flue kit) can now be fitted.
If the vertical flue requires extension/s or additional bend/
s, connect the required number of flue extensions or bends
Fig. 9
(up to the maximum equivalent flue length) between the
boiler and vertical flue assembly (see fig. 8).
Ensure that any horizontal sections of the flue system
have a minimum 1º; maximum 3º fall back to the boiler (1º
= 17mm per 1000mm)
NOTE
When cutting an extension to the required length, you must
ensure that the excess is cut from the plain end of the
extension (see fig. 8). Remove any burrs, and check that
any seals are located properly.
You must ensure that the entire flue system is properly
supported and connected.
4.5.3 TWIN FLUE SYSTEM
The Vokera twin flue system enables greater flue distances
to be achieved (see 4.4.2) than that of a concentric flue
system. It can be used for horizontal or vertical applications,
however the twin flue system must be converted to the
dedicated concentric flue kit for termination. It is essential
that the installation of the twin flue system be carried out
in strict accordance with these instructions.
GUIDANCE NOTES ON TWIN FLUE INSTALLATION
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The flue must have a have a minimum 1º; maximum 3º
(1º = 17mm per 1000mm) fall back to the appliance to
allow any condensate that may form in the flue system
to drain via the condensate drain. Consideration must
also be given to the fact that there is the possibility of a
small amount of condensate dripping from the terminal.
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Ensure that the entire flue system is adequately
supported, use at least one bracket for each extension.
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The entire flue system must be adequately insulated to
maintain heat within the flue system thereby reducing
the possibility of condensate production.
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As the exhaust outlet pipe can reach very high
temperatures it must be protected to prevent persons
touching the hot surface.
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The condensate drain pipe must be connected in
accordance with building regulations.
“X”
Twin flue accessories
Part No.
Description
Length
0225805
Horizontal flue terminal
1.0 metre
0225810
Vertical flue terminal
1.0 metre
430
Twin adapter kit
N/A
531
Pitched roof flashing plate
N/A
532
Flat roof flashing plate
N/A
0225815
Condensate drain kit
N/A
0225820
0.25m extension (pair)
250mm
0225825
0.5m extension (pair)
500mm
0225830
1.0m extension (pair)
1000mm
0225835
2.0m extension (pair)
2000mm
0225840
45º bend (pair)
N/A
0225845
90º bend (pair)
N/A
0225850
Twin bracket (5)
N/A
0225855
Single bracket (5)
N/A
“X”= 202mm