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3.4.4 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. 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 fl ange 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 fl ue pipes can be fi tted with or without additional
elbows and need no clamps, simply ensure that the red o-ring
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 o-ring 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.
The maximum permissible fl ue length for twin fl ue is
dependent on the type of run used (see table on page 24).
For further information relating to fl ue runs not illustrated,
please contact the Technical Department on 0870 241 8180.
Fig. 3.22
3. installation
21
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