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INSTALLATION
Fitting the Twin Pipe (Ø80 / 80)
Note: See table for maximum and minimum flue runs.
Where it is not possible to terminate the flue within the distance
permitted for coaxial flues, the twin flue pipe can be used by fitting
a special adaptor to the flue connector and using the aperture for
the air intake located on top of the combustion chamber.
Always ensure that the flue is adequately supported, using one flue
bracket per extension and avoiding low points. (ARISTON supply
suitable clamps as Part No. 705778).
To utilise the air intake it is necessary to:
1) Take the air intake cover off the top of the appliance
2) Assemble the flange on the header supplied with the boiler
3) Insert the header on the tube or the elbow up until the lower stop
(you do not have to use the washer).
4) Insert the elbow/header in the boiler air intake hole and fasten it
with screws.
The twin flue pipes can be fitted with or without additional elbows
and need no clamps, simply ensure that the lip seal is inserted in the
female end of the flue pipe and push the extension piece fully into
the previous section of flue pipe or elbow, check that the lip seal is
not dislodged when assembling the flue (greasing the seal will aid
assembly).
Twin pipe can also be converted back to Coaxial flue to enable
vertical termination with a coaxial kit by using the pipe bridge (Twin
- Coaxial Adaptor - Part No. 3318089). When running the twin flue
pipe vertically.
It is not possible to terminate concentrically horizontally. Termination
is only possible with separate air and exhaust terminals.
When siting the twin flue pipe, the air intake and exhaust terminals
must terminate on the same wall, the centres of the terminals must
be a minimum of 280 mm apart and the air intake must not be sited
above the exhaust terminal (refer to Fig. 10). The air intake pipe can
be run horizontally, however, the terminal and the final 1 metre of
flue must be installed either horizontally or with a slight fall away
from the boiler to avoid rain ingress.
It is also strongly recommended that the air intake pipe run be
constructed of insulated pipe to prevent condense forming on the
outside of the tube.
Ensure the exhaust tube has a minimum fall back to the boiler of 1˚ /
metre (1˚ = 17.5mm/metre)
The maximum permissible flue length for twin flue is dependent on
the type of run used (see table on page 22).
For further information relating to flue runs not illustrated, please
contact the Technical Department on 0870 241 8180.
20


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