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21
INSTALLATION
Fitting the Twin Pipe (Ø80 / 80)
Note: See table for maximum and minimum
fl
ue runs.
Where it is not possible to terminate the
fl
ue within the distance
permitted for coaxial
fl
ues, the twin
fl
ue pipe can be used by
fi
tting a special adaptor to the
fl
ue connector and using the
aperture for the air intake located on top of the combustion
chamber.
Always ensure that the
fl
ue is adequately supported, using one
fl
ue bracket per extension and avoiding low points. (ARISTON
supply suitable clamps as Part No. 3318015).
To utilise the air intake it is necessary to:
1) Remove the top of the air intake by cutting it with a suitable
knife.
2) Insert the header on the tube or the elbow up until the lower
stop (you do not have to use the washer).
3) Insert the elbow/header in the boiler air intake hole and fasten
it with screws.
The twin
fl
ue pipes can be
fi
tted with or without additional elbows
and need no clamps, simply ensure that the lip seal is inserted
in the female end of the
fl
ue pipe and push the extension piece
fully into the previous section of
fl
ue pipe or elbow, check that
the lip seal is not dislodged when assembling the
fl
ue (greasing
the seal will aid assembly).
Twin pipe can also be converted back to Coaxial
fl
ue to enable
vertical termination with a coaxial kit by using the pipe bridge
(Twin - Coaxial Adaptor - Part No. 3318089). When running the
twin
fl
ue pipe vertically.
It is not possible to terminate concentrically horizontally.
Termination is only possible with separate air and exhaust
terminals.
When siting the twin
fl
ue 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
fi
nal 1 metre of
fl
ue 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
fl
ue length for twin
fl
ue is dependent
on the type of run used (see table on page 23).
For further information relating to
fl
ue runs not illustrated, please
contact the
Technical Department
on
0333 240 7777.
