14
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 us
-
ing 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 (up
to the maximum equivalent flue length) between the boiler and
vertical flue assembly (see fig. 13).
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 en-
sure that the excess is cut from the plain end of the extension.
Remove any burrs, and check that any seals are located properly.
You must ensure that the entire flue system is properly sup
-
ported and connected.
4.5.3 TWIN FLUE SYSTEM
The Vokèra twin flue system enables greater flue distances
to be achieved 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
• 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.
• Ensure that the entire flue system is adequately supported,
use at least one bracket for each extension.
• As the exhaust outlet pipe can reach very high temperatu
-
res it must be protected to prevent persons touching the hot
surface.
• The condensate drain pipe must be connected in accordan
-
ce with building regulations.
Reduction for bends
Bend
Reduction in maximum flue length for
each bend
45º bend
1.0 metre
90º bend
1.5 metre
Twin flue accessories
Part No.
Description
Length
0225805
Horizontal flue terminal
1.0 metre
0225810
Vertical flue terminal
1.0 metre
359
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)
50mm
0225825
0.5m extension (pair)
00mm
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
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 ap-
pliance onto the bracket.
4.5.2 CONCENTRIC VERTICAL FLUE
The appliance can be used with either the Vokèra condensing
60/100mm concentric flue system or the optional 80/125mm
concentric flue system.
NOTE
These instructions relate
only
to the Vokèra condensing
60/100mm concentric flue system. For specific details on the
installation of the 80/125mm concentric flue system please re
-
fer to the instructions supplied.
The vertical flue terminal can be connected directly to the ap
-
pliance flue outlet. Alternatively, an extension or bend can be
connected to the appliance flue outlet if desired, however if
additional bends are fitted, a reduction must be made to the
maximum flue length (see table below).
Reduction for bends
Bend Reduction in maximum flue length for each bend
45º bend
1.0 metre (60/100) - 1.0 metre (80/125)
90º bend
1.0 metre (60/100) - 1.5 metre (80/125)
Vertical flue terminal and accessories
Part No.
Description
Length
29450122 Vertical flue terminal
1000mm
531
Pitched roof flashing plate
N/A
532
Flat roof flashing plate
N/A
29450123
90-degree bend
N/A
29450124
45-degree bends (pair)
N/A
29450125
500mm extension
500mm
29450126
1000mm extension
1000mm
29450127
2000mm extension
2000mm
29450128
Telescopic extension
372/519mm
529
Wall bracket pack (5)
208mm
Using the dimensions given in fig. 11 as a reference, mark and
cut a 125mm hole in the ceiling and/or roof.
Fig. 17
“X”
12/15/20HE = 202mm
25/30/35HE = 218mm
130mm
Fit the appropriate flashing plate to the roof and insert the ver
-
tical 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 ap-
pliance onto the bracket.
