Glow-worm Ultrapower sxi Range - Manual (Page 35)

35
10 Twin Flue - Length, Preparation and Installation
10.12 Twin flue
The twin flue system is available as an option when the top
outlet horizontal concentric rear or vertical flue system is not
appropriate, see diagram 10.26.
The system is made up of accessories. The accessories
include terminal assembly, bends 45º and 90º, flue extensions,
fixing bracket and appropriate weather collar, see diagram
10.27.
The system can provide an independent horizontal air inlet
and flue outlet, horizontal air inlet and vertical flue outlet or
vertical air inlet and flue outlet via a concentric terminal.
NOTE: The air and flue outlets do not have to be equal
lengths. 2x45° bends can replace 1x90° bend if necessary.
The maximum permitted combined straight pipe length is 40
metres plus terminal assemblies, for each 90° or 45° x 2 bends
fitted, 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 flue
pipe.
Terminal Position
The clearances for a flue 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 flue outlet on the same wall or 1200mm from an
opposing flue outlet.
Installation Details
The parts available for a twin flue system installation are
shown in diagram 10.27.
Boiler Connection
IMPORTANT: The flue seals are sensitive to mineral oil based
lubricants. Do not grease the seals. If the seals do need to
be lubricated use only water.
Push the twin flue 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.
Air and Flue Pipe Installation
The air and flue pipes can now be built up from the boiler.
The flue must be designed with a continuous fall towards the
boiler. If using the horizontal flue 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.
To avoid rain ingress to the air Inlet terminal, it is good practice
to aim the inlet downwards by approx 2° as rain can damage
the boiler. The Flue outlet pipe must always run at 44mm/
metre (2.5°) back to the boiler.
IMPORTANT:
Long lengths of flues must be secured to the wall or ceiling it
runs against. Use at least one fixing bracket on each flue joint
used or on straight flue runs every joint and for every metre
flue run.
Provision must be made in concealed boxing or ductwork that
the flue joints can be inspected during annual servicing.
The flue seals are sensitive to mineral oil based lubricants. Do
not grease the seals. If the seals do need to be lubricated
use only water.
Do not use the flue pipe to attach other pipes or equipment.
If visible, advise the householder not to hang or clip items to
flue pipes. Diagram 10.27
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