Concentric Ducts; Separate Ducts; Separate Ducts (Type B23); Separate Ducts With Shelter Kit (Type B23) - Baxi LUNA DUO-TEC IN+ Instruction Manual For Users And Fitters

10.1 CONCENTRIC DUCTS

This type of duct is used to discharge exhaust fumes and draw combustion
air both outside the building and if a LAS flue is fitted. The 90° coaxial bend
allows the boiler to be connected to a flue-air duct in any direction as it can
be rotated by 360° It can also be used as a supplementary curve combined
with a coaxial duct or a 45° curve.
If fumes are discharged outside the building, the flue-air duct must protrude
at least 18 mm from the wall to allow an aluminium weathering surround to
be fitted and sealed to avoid water infiltrations.
• A 90° bend reduces the total duct length by 1 metre.
• A 45° bend reduces the total duct length by 0.5 metres.
• The first 90° bend is not included when calculating the maximum available length.
Fasten the suction pipes using two galvanised Ø 4,2 mm self tapping screws with minimum length 19 mm. If not
included with the supply, screws with the same characteristics must be sourced on the market separately.
Before securing the screws, make sure that at least 45 mm of the pipe is inserted into the gasket (see the figures in annex
"SECTION" D at the end of this manual).
Make sure there is a minimum downward slope of 5 cm per metre of duct towards the boiler.
SOME OUTLET DUCT INSTALLATION EXAMPLES AND THEIR RELATIVE MAXIMUM LENGTHS ARE SHOWN IN ANNEX
"SECTION" D AT THE END OF THIS MANUAL.

10.2 SEPARATE DUCTS

This type of installation makes it possible to discharge exhaust fumes both
outside the building and into single flue ducts. Comburent air can be drawn
in at a different location from that of the flue terminal. The accessory splitting
kit comprises a flue duct adaptor (80) (B) and an air duct adaptor (A). For the
air duct adaptor, fit the screws and seals previously removed from the cap.
The 90° bend is used to connect the boiler to the inlet and outlet ducts, adapting
them to various requirements. It can also be used as a supplementary curve
combined with a duct or a 45° bend.
• A 90° bend reduces the total duct length by 0.5 metres.
• A 45° bend reduces the total duct length by 0.25 metres.
• The first 90° bend is not included when calculating the maximum available length.
Make sure there is a minimum downward slope of 5 cm per metre of duct towards the boiler.
SOME OUTLET DUCT INSTALLATION EXAMPLES AND THEIR RELATIVE MAXIMUM LENGTHS ARE SHOWN IN ANNEX
"SECTION" D AT THE END OF THIS MANUAL.

SEPARATE DUCTS (TYPE B23)

For B23 type discharge, the comburent air is drawn out of the room where
the boiler is installed. The accessories for separate 80 mm ducts are required
for the discharge of fumes. This type of installation makes it possible to
discharge exhaust fumes both outside the building and into single flue ducts.
The accessory splitting kit comprises an 80 mm flue duct adaptor (B) and
an air duct adaptor (A). For the air duct adaptor, fit the screws and seals
previously removed from the cap.
THE MAXIMUM LENGTH OF THE FLUE DUCT IS 25 m.

SEPARATE DUCTS WITH SHELTER KIT (TYPE B23)

For B23 type discharge, the comburent air is drawn out of the
room where the boiler is installed. The 60/80 mm flue duct
adaptor and the 80 mm flue ducts supplied as accessories
are required for the discharge of fumes.
THE MAXIMUM LENGTH OF THE FLUE DUCT IS 25 m.
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