Installing The Flue; Concentric Ducts; Separate Ducts - Baxi NUVOLA PLATINUM + Instruction Manual For Users And Fitters

13. INSTALLING THE FLUE

The boiler is easy and flexible to install thanks to the extensive range of available
accessories, as described below. The boiler has been designed for connection to a
vertical or horizontal coaxial flue-air duct. The boiler can also be used with separate
ducts using the accessory splitting kit.
WARNINGS
C13, C33 The terminals for separate flues must be fitted inside a 50 cm square. Detailed
instructions are provided with the individual accessories.
C53 Do not fit the flue and air duct terminals on opposite walls of the building.
C63 The pressure drop of the ducts must not exceed 100 Pa. The ducts must be certified
for this specific use and for a temperature in excess of 100°C. The flue terminal must be
certified to EN 1856-1.
C43, C83 The flue terminal or flue duct must be suitable for the purpose.
For optimal installation, the accessories supplied by the manufacturer should be used.
To optimise operating safety, make sure the flue ducts are firmly fixed to the wall with suitable brackets. The brackets must be
positioned over the joints at a distance of approximately 1 metre from one another.

13.1 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.
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.

13.2 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.
41
A B
7219840.02 (1-03/16)