VOKERA Unica i28 User Instructions - page 17
15
EXTENDING THE FLUE
Connect the bend – supplied with the terminal kit – to the top
of the boiler using clamp (supplied) see fig. 15. 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 exten
-
sions or bends (up to the maximum equivalent flue length) to
the flue terminal (see fig. 15-17).
The flue system should have
a minimum of 1º; maximum of 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. 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 us
-
ing cement or a suitable alternative that will provide satisfactory
weatherproofing. The interior and exterior trim can now be fitted.
Fig. 17
4.5.1.2 FITTING THE REAR FLUE (fi g. 18) (rear flue outlet
only)
Using the template provided, mark and drill a 125mm hole for
the passage of the flue pipe, see fig 12. The hole should be
drilled LEVEL to ensure any condense fluid that forms, is al
-
lowed to drain back to the appliance. 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 en
-
sure that the bracket is mounted securely. Once the bracket
has been secured to the wall, remove the blanking plate from
the rear of the boiler (Fig.20).
NOTE The inner 60mm pipe of the rear flue terminal mu
st be
cut by 12mm at the point indicated (fig.18 pos. A).
Fig.18
Fig.20
Using the screws and washers provided, secure the appliance
onto the wall bracket and tighten with a suitable spanner.
Seal the flue assembly to the wall using cement or a suitable
alternative that will provide satisfactory weatherproofing. The
exterior wall trim can now be fitted.
Fig.19
Fig. 16
Part No.
Description
Length
29450133
Rear flue terminal
825mm
Attach the rear flue terminal to the appliance (using the pre
-
viously retained screws) and fix the telescopic terminal to the
correct length (wall thickness) ensuring that the terminal will
protrude through the wall by the correct distance. At this point,
lift the appliance and carefully insert the terminal into and
through the wall, ensuring that the holes in the appliance back
frame are aligned with the studs on the wall bracket.
Seal the top flue outlet of the boiler with the blanking plate
provided with the rear flue kit (Fig. 19).
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