Installing The Ducts; Concentric Ducts - De Dietrich MPX 24 COMPACT Notice D'emploi Et D'installation

10. INSTALLING THE DUCTS

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.
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.
Read carefully the venting instructions contained in this manual and the ones supplied by the vent manufacturer, in
case of discrepancies the venting instruction of this manual must be respected.

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.
9 7679433.01 (1-04/17)