11
Fig. 9
Using the dimensions given in fig. 9 as a refer-
ence, 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 60mm & 100mm clips,
gaskets & 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 addi-
tional bend/s, connect the required number of flue
extensions or bends (up to the maximum equiva-
lent flue length) between the boiler and vertical flue
assembly (see fig. 8).
Ensure that any horizontal sections of the flue
system have a 1º fall back to the boiler (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 dedi-
cated 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 INSTALLA-
TION
•••••
The flue must have a fall back of 1º back to the
appliance to allow any condensate that may
form in the flue system to drain via the conden-
sate drain. Consideration must also be given to
the fact that there is the possibility of a small
amount of condensate dripping from the termi-
nal.
•••••
Ensure that the entire flue system is adequately
supported, use at least one bracket for each
extension.
•••••
The entire flue system must be adequately
insulated to maintain heat within the flue system
thereby reducing the possibility of condensate
production.
•••••
As the exhaust outlet pipe can reach very high
temperatures it must be protected to prevent
persons touching the hot surface.
•••••
The condensate drain pipe must be connected in
accordance with building regulations.
300 mm minimum
218 mm
520 mm
Twin flue accessories
Part No.
Description
Length
0225805
0225810
359
0225770
0225765
0225815
0225820
0225825
0225830
0225835
0225840
0225845
0225850
0225855
Horizontal flue terminal
Vertical flue terminal
Twin adapter kit
Pitched roof flashing plate
Flat roof flashing plate
Condensate drain kit
0.25 m extension (pair)
0.5 m extension (pair)
1.0 m extension (pair)
2.0 m extension (pair)
45° bend (pair)
90° bend (pair)
Twin bracket (5)
Single bracket (5)
1.0 metre
1.0 metre
N/A
N/A
N/A
N/A
250 mm
500 mm
1000 mm
2000 mm
N/A
N/A
N/A
N/A
Bend
45° bend
90° bend
Reduction in maximum flue length for each
bend
Reduction for bends
1.0 metre
1.0 metre
MOUNTING THE BOILER
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.
4.5.3.1 INSTALLATION OF TWIN ADAPTOR KIT (fig. 10
& 11)
•••••
Insert the exhaust connection manifold (
A
) onto
the appliance flue outlet.