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installation

When utilising the vertical ﬂ ue system, action must be taken to
ensure that the ﬂ ue is supported adequately to prevent the weight
being transferred to the appliance ﬂ ue connection.
When the ﬂ ue passes through a ceiling or wooden ﬂ oor, there must
be an air gap of 25mm between any part of the ﬂ ue system and any
combustible material. The use of a ceiling plate will facilitate this.
Also when the ﬂ ue passes from one room to another a ﬁ re stop
must be ﬁ tted to prevent the passage of smoke or ﬁ re, irrespective
of the structural material through which the ﬂ ue passes.

Fitting the Flue (Twin Pipe)

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.

For twin ﬂ ue installation it is most important to avoid any possible
condense formation entering the appliance.

Should there be the possibility of condensation forming within
the ﬂ ue, there are two options;

1) Where condense will form but can be negated with insulated

ﬂ ue, install the insulated ﬂ ue with a fall of 5mm in every metre
away from the boiler.

2) The exhaust ﬂ ue will have a fall of 3

back to the boiler and a

suitable trap will be ﬁ tted on the exhaust as close to the boiler
as possible, condense will then be suitably disposed of.

Where the ﬂ ue runs through cold spots, i.e. loft areas, condense
is likely to be formed, therefore a fall back to the boiler and a trap
is required.
Always ensure that the ﬂ ue is adequately supported, avoiding low
points. (MTS supply suitable clamps as Part No. 705778).

To utilise the air intake it is necessary to:
Remove the blank intake by cutting it with a suitable knife (Fig.
23, page 20);
Insert the elbow/ﬂ ue pipe into the air intake until it stops;
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.

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. 3318030). When running the
twin ﬂ ue pipe vertically, a condense trap must always be used on
the exhaust pipe.
It is not possible to use the pipe bridge for horizontal
termination.

Minimum off set distance when using 2x 45° bends

WARNING
If the chosen fl ue length requires the use of the restrictor, it is
already fi tted inside the fl ue gas collar. In the event of an in-
stallation which does not require the use of the restrictor, the
latter should be removed from the fl ue gas collar. See table A
(Page 20 and Fig 22b).

Fig. 22a

Fig. 22b