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F
2.15
IG
WARNING
I
F THE FLUE IS LONGER THAN
(F
. 2.11). I
RESTRICTOR
IG
METRE THE RESTRICTOR REMAINS FITTED
S
2.1
(P
17)
EE TABLE
AGE
Minimum offset distance when using 2x 45
F
2.16
IG
14
1
,
METRE
REMOVE THE
F THE FLUE IS BETWEEN
.
.
o
bends
Considerations necessary for twin flue installation;
It is most important to avoid any possible condense
formation entering the appliance.
According to Table 2.1 (Page 17) decide if condensation
will form within the flue. If yes, there are two options;
1) Where condense will form but can be negated with
insulated flue, install insulated the flue with a fall of
5mm in every metre away from the boiler.
2) The exhaust flue will have a fall of 3
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 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:
Remove the 'knockout' of the air intake by cutting it with a
0-1
suitable knife (F
IG
Insert the elbow/flue pipe into the air intake until it stops.
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 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
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.
N
: Vertical twin flue installations must have a trap on
OTE
the exhaust. MTS supply a suitable condense
trap Part No. 705774 and recommend that this be
used in the event that the flue may not form
condense.
When siting the twin flue pipe, the air intake and exhaust
terminals must terminate on the same wall, the centres of
the terminal centres must be a minimum of 280 mm apart
o
back to the boiler
. 2.17).
o
back to the boiler, is suitably trapped
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