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. 14).
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 exten-
sion. 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.
• 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.
Reduction for bends
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)
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
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.
Fig. 13a
HORIZONTAL TERMINATION (fig. 13c)
The twin flue system must be converted to the dedicated con
-
centric flue kit for termination.
• The horizontal terminal is supplied with a built-in converter
box and cannot be shortened.
• A 130mm hole is required for the passage of the concentric
terminal through the wall.
• The air inlet pipe must always be level with or below, that of
the exhaust pipe.
Depending on site conditions it may be preferable to install the
terminal assembly prior to fitting the twin flue pipes.
Mark and drill a level 130mm hole for the passage of the horizontal
flue terminal. Insert the terminal assembly into the flue hole.
Push-fit the twin flue pipes onto the concentric to twin converter
box ensuring that the exhaust pipe connects to the exhaust
connection on the concentric to twin converter.
If necessary cut the plain ends (male) of the twin flue pipes to
allow connection to the concentric to twin converter.
NOTE
Before cutting twin flue pipes ensure allowances have been
made for connection onto the previous piece and onto the con-
centric to twin converter. The last twin flue pipes must be pushed
50mm onto the male spigots of the concentric to twin converter.
NOTE
Seal the flue terminal assembly to the wall using cement or a
suitable alternative that will provide satisfactory weatherproof-
ing. The interior and exterior trim can now be fitted.
VERTICAL TERMINATION (fig. 14)
The twin flue system must be converted to the dedicated con
-
centric flue kit for termination.
• The vertical terminal is supplied with a built-in converter box
and cannot be shortened.
Once the bracket has been secured to the wall, mount the ap-
pliance onto the bracket.
INSTALLATION OF TWIN ADAPTOR KIT (fig. 13a-13b)
• Insert the exhaust connection manifold (A) onto the appliance
flue outlet.
• Remove the blanking plate (located to the left of the appliance
flue outlet) and – using the same screws – install the air inlet
plate (B).
• Using the hole in the exhaust connection manifold as a guide,
drill a 3mm hole in the appliance flue spigot and secure the
exhaust manifold connection to the flue spigot using the screw
provided (C).
• Using the two holes in the air inlet plate as a guide, drill a
3mm hole in each and secure the air inlet pipe/bend using
the screws provided.
The twin flue pipes extensions and accessories can now be
installed by pushing together (the plain end of each extension
or bend should be pushed approximately 50mm into the female
socket of the previous piece).
B
A
C
Bend
Reduction in maximum flue length for each bend
45º bend 1.0 metre
90º bend 1.5 metre
Fig. 13b
