Riello Vokera VISION PLUS 20 S User Instructions page 20

Fig. 12
A
Fig. 13
4.2.4 EXTENDING THE FLUE
Connect the bend – supplied with the terminal kit – to the top
of the boiler using clamp (supplied). The additional bends &
extensions have push-fit connections, care should be taken
to ensure that the correct seal is made when assembling the
flue system. Connect the required number of flue extensions
or bends (up to the maximum equivalent flue length) to the flue
terminal (Fig. 14). The flue system should have a 3º rise from
the boiler to outside, to ensure any condense fluid that forms,
is allowed to drain back to the appliance.
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 (Fig. 15). Remove any burrs, and check that all seals are
located properly. You must ensure that the entire flue system is
properly supported and connected. Seal the flue assembly to
the wall using cement or a suitable alternative that will provide
satisfactory weatherproofing. The interior and exterior trim can
now be fitted.
Fig. 14
20
4.5.2 CONCENTRIC VERTICAL FLUE
Using Fig. 15 as a reference, cut a 110mm diameter hole in
the roof and/or ceiling to facilitate the route of the vertical flue
system. NOTE: ensure that the top of the appliance - if already
in position - is covered and protected from the possibility of any
dust or debris falling or entering the appliance via the flue outlet.
Fit the appropriate flashing to the roof and insert the vertical flue
terminal through the flashing from outside, ensuring that the
collar of the terminal is located over the outlet of the flashing.
The fixing holes for the appliance 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.
If the vertical flue system requires additional extensions or bends,
connect these to the vertical terminal, ensuring the following:
- the maximum permitted flue length is not exceeded
- reductions to the maximum flue length have been made for
any bends that are used on the vertical flue system
- any horizontal sections of the flue system, incorporate a
3-degree fallback to the appliance
- the entire flue system is fully supported and secured using
the appropriate brackets
- if/when an extension is cut to a shorter length, ensure that
the excess length is cut from the plain end of the extension,
and that any burrs or rough edges are removed
- all seals are properly located before assembling or connecting
the flue system.
IMPORTANT: The VX flue terminal is supplied with a sachet of
silicone lubricant; smear a small amount of the lubricant around
both inner and outer connections, at both ends of the vertical
flue connector (supplied with the VX terminal).
NOTE (Fig. 15): The appliance incorporates a 'click-fit' flue
connection. Ensure that both screws 'C' on the 'click-fit' have
been slackened off. Ensure that the connector is correctly aligned
with the 'click-fit' and insert it into the 'click-fit' until it clicks into
position (this is when the tabs at points 'A' are located in the
groove of the vertical flue connector). Both screws (C) should
now be tightened.
NOTE: If more convenient, the vertical flue connector can be
attached to the vertical flue terminal/extension before connecting
it to the appliance.
NOTE: If more convenient, the vertical flue connector can be
attached to the vertical flue terminal/extension before connecting
it to the appliance.
NOTE
Additional bends and/or extensions can be connected to the
terminal connector if desired, however if additional bends are
fitted, a reduction must be made to the maximum flue length
(see table below).
vertical
connection
B
A
C
Fig. 15
Reduction for bends
Bend Reduction in maximum flue length for each bend
45º bend 1.0 metre
90º bend 1.0 metre
A
C
flange installed
as standard