Supplied By www.heating spares.co Tel. 0161 620 6677
30
9.16 Twin fl ue
The twin fl ue system is available as an option when the top
horizontal, rear or vertical fl ue system is not appropriate.
The system can provide an independent horizontal air inlet and
fl ue outlet, horizontal air inlet and vertical fl ue outlet or vertical
air inlet and fl ue outlet via a concentric terminal.
NOTE: The air and fl ue outlets do not have to be equal lengths.
2x45° bends can replace 1x90° bend if necessary.
The maximum permitted straight pipe length is 10 metres plus
terminal assemblies, for each 90° or 45° x 2 bends fi tted, the
maximum length must be reduced by 1 metre.
NOTE: When using 90° bends any horizontal run should be
inclined by a minimum of 44mm/metre (2.5°) towards the boiler
to facilitate condense removal.
Alternatively use 45° bends to avoid horizontal runs in the fl ue
pipe.
Terminal Position
The clearances for a fl 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 fl ue outlet on the same wall or 1200mm from an op-
posing fl ue outlet.
Installation Details
The parts available for a twin fl ue system installation are shown
in diagram 9.23.
Boiler Connection
Remove the top fl ue outlet cover secured with four screws, see
diagram 9.2
Push the twin fl ue adaptor onto the outlet of the boiler with the
air inlet to the left hand side. Secure the adaptor to the top
panel with the screws provided. Care should be taken when
inserting the screw through the hole in adaptor top.
To facilitate engagement, it is recommended that the rubber
‘O’ rings are lubricated with silicone grease or water prior to
assembly.
See diagram 9.24 new adaptor in position.
Air and Flue Pipe Installation
The air and fl ue pipes can now be built up from the boiler.
The fl ue must be designed with a continuous fall towards the
boiler. If using the horizontal fl ue pipe or 90° bends the pipe
must be inclined at 44mm/metre (2.5°) minimum, see diagram
9.25.
Alternatively if space allows, use 45° bends in place of 90º
bends.
The rubber ‘O’ rings of each section should be lubricated prior
to assembly with silicone grease.
When building the fl ue up it is recommended that it is supported
every 2 metres and at every bend by a fi xing bracket.
Diagram 9.23
12970
9 Flue Preparation and Installation
To Next Page
Loading...
