User guide

33
9 Twin Flue - Length, Preparation and Installation
9.16 Twin ue
The twin ue system is available as an option when the top
horizontal or vertical ue system is not appropriate.
The system can provide an independent horizontal air inlet
and ue outlet, horizontal air inlet and vertical ue outlet or
vertical air inlet and ue outlet via a concentric terminal.
The system is made up from accessories, see diagram 9.25.
NOTE: The air and ue outlets do not have to be equal
lengths. 2x45º bends can replace 1x90º bend if necessary.
The maximum permitted combined (air inlet + ue outlet) ue
length is 14,3 metres for Betacom 24C, 11,9 metres for
maximum ue length must be reduced by 1 metre, see
diagram 9.24.
NOTE: When using 90º bends any horizontal run should be
inclined by a minimum of 44mm/metre (2.5º) towards the
boiler to facilitate condense removal.
Alternatively use 45º bends to avoid horizontal runs in the ue
pipe.
9.17 Terminal Position
The clearances for a ue outlet are given in the "Flue Location
and Ventilation" section.
In addition the horizontal air inlet must not be closer than 300
mm from a ue outlet on the same wall or 1200mm from an
opposing ue outlet.
9.18 Installation Details
The parts available for a twin ue system installation are
shown in diagram 9.25.
Diagram 9.25
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