26
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.
Considerations necessary for twin flue installation;
It is most important to avoid any possible condense formation
entering the appliance.
Condense may form when the exhaust pipe is longer than
6.6m. If this is the case, there are two options;
1) Where condense will form but can be negated with insulated
flue, install the insulated flue ensuring it has a fall of 5mm in
every metre away from the boiler.
2) The exhaust flue will have a fall of 3
o
back to the boiler and a
suitable trap will be fitted on the exhaust as close to the boiler
as possible, condense will then be suitably disposed of.
Where the flue runs through cold spots, i.e. loft areas,
condense is likely to be formed, therefore in such cases a fall
back to the boiler and a trap is required.
Always ensure that the flue is adequately supported, avoiding
low points. (MTS supply suitable clamps as Part No. 705778).
To utilise the air intake it is necessary to:
1) Take the air intake cover off
2) Assemble the flange on the header supplied with the boiler
3) Insert the restrictor if necessary, on the tube or the elbow
4) Insert the header on the tube or the elbow up until the lower
stop (you do not have to use the washer).
5) 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 red o-ring
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 o-ring is not dislodged when assembling
the flue.
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. 705767). When running the
twin flue pipe vertically, a condense trap must always be used
on the exhaust pipe.
It is not recommended that the pipe bridge be used for
horizontal termination, however in the unlikely event that this
proves to be a necessity it is extremely important that the entire
flue has a fall of 3
o
back to the boiler, is suitably trapped and
where the 60mm inner flue of the concentric terminal connects
to the pipe bridge, this point must be adequately sealed with
silicone sealant to avoid condense leakage at this point.
F
IG
. 11.10
F
IG
. 11.11
Minimum offset distance when using 2x 45
o
bends
11.5 Fitting the twin pipe (Ø80/80)
Summary of Contents for GENUS 30 Plus
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