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4. If necessary, cut the end pipe to size, ensuring that the external pipe protrudes from the wall by
between 10 and 60 mm (fi g. 10a and 10b). Remove the cutting burrs.
5. Connect the fl ue to the boiler, positioning the seals correctly. Seal the fl ue into the wall with silicone
or sand + cement and cover with wall seals provided.
Flue seals should be lubricated with a silicone type grease to prevent damage (grease not sup-
plied)
The total length in equivalent metres of the
concentric fl ue must not exceed the maximum
lengths stated in the following table, note that
each bend gives rise to the stated reduction.
For example, a duct = 60/100 composed of 1
bend of 90° +1 horizontal metre + 2 bends of
45° + 1 horizontal metre has a total equivalent
length of 4 metres.
Table 2a
Maximum permissible
duct length (Horizontal)
Maximum permissible
duct length (Vertical)
Table 2b
Reduction factors for bends
For the installation:
1. Defi ne the position for installing the unit.
2. Drill the wall for the air/fl ue pipe outlet accor-
ding to the references stated in the table,
considering that the horizontal sections of
piping must have a gradient of approxima-
tely 3 mm per metre of length downwards
to prevent any rainwater getting into the
boiler.
3. Make a hole of diameter 10 - 20 mm greater
than the nominal diameter of the coaxial pipe
used to facilitate insertion.
4. If necessary, cut the end pipe to size, consi-
dering that the external pipe must protrude
from the wall by between 10 and 60 mm (Fig.
10a and 10b). Eliminate the cutting burrs and
lubrifi cate seals.
5. Connect the ducts to the boiler, positioning
the gaskets correctly and seal the wall cou-
pling points with special sleeves.
18
Vertical Outlet
Ø mm
Ø mm
60/100
80/125
5 m
12 m
6 m
12 m
1 m
0,5 m
0,5 m
0,25 m
Optimax 25 OV
Roof end piece
1KWMA83U
Angled roof tile
1KWMA82U
1KWMA56U
fi g. 10c
1KWMA71W
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