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Coaxial flues (Ø 80/125)
An adapter kit must be used in order to install this size
of flue. Coaxial flues can be oriented in whatever di-
rection is most convenient for the room, provided the
maximum lengths specified alongside are respected.
9
Use only flues specifically designed for use with
condensing boilers . Follow the instructions provi-
ded in the flue pipe kit to install the flues.
Twin flues (Ø 80)
Twin flues can be oriented in whatever direction is most
convenient for the room.
9
Ensure that the flue gas vent pipe has a 1% slope
towards the boiler.
9
Use of flues longer than the maximum specified
alongside leads to a loss of heat output from the
boiler (see table alongside).
9
The boiler automatically adapts its ventilation sy-
stem to suit the type of installation and the length
of the flue. Never obstruct or partly choke the com-
burent air intake pipe.
9
Use only flues specifically designed for use with
condensing boilers. Follow the instructions provi-
ded in the flue pipe kit to install the flues.
Unscrew the screws and remove the cover from the air
intake (A), and connect the comburent air pipe to it.
Connect the vent pipe to the flue gas outlet (B).
If the flue pipes used differ in length from those shown
in the table, make sure that the total length does not
exceed 80 metres and that the maximum length of each
individual pipe section does not exceed 40 metres.
Maximum straight length of
coaxial flue Ø 80/125 (m)
14,85
9
Maximum straight length is the maximum length of
the flue without bends, terminals or joints.
9
Values referred to atmospheric pressure at sea level.
Maximum straight length of
twin flues (m)
50+50 (20 ISC Solar)
30+30 (30 ISC Solar)
9
Maximum straight length is the maximum length of
the flue without bends, terminals or joints.
9
Values referred to atmospheric pressure at sea level.
B
33
INSTALLER
Pressure drop (m)
45° bend 90° bend
1,5
1
Pressure drop (m)
45° bend 90° bend
0,5
0,8
0,5
0,8
A
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