Glow-worm 18sxi, Installation And Servicing Manual, Page: 32 / 64

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10 Twin Flue - Length, Preparation and Installation
Diagram 10.26
13240
Installation Details
The parts available for a twin flue system installation are
shown in diagram 10.25.
Boiler Connection
Push the twin flue adaptor onto the outlet of the boiler with
the air inlet to the left hand side, see diagram 10.26. 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.
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
10.25.
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 flue up it is recommended that it is
supported every 2 metres and at every bend by a fixing
bracket.
Horizontal Terminal Installation
With due consideration to terminal clearances mentioned
in Section 4.2 drill the one or two holes as required with a
90mm core drill.
Push the horizontal terminal through the wall allowing approx.
100mm to protrude outside.
Push a grey rubber wall seal onto either side of the wall
ensuring that both wall seals are pushed up to the wall
surface, see examples (b) and (c) diagram 10.24.
Vertical Terminal Installation
With due consideration to terminal clearances mentioned in
Section 4.2, project the rise of the flue pipe to roof level and
cut 150mm hole in the roof.
(a) Pitched Roof
Fit the required pitched roof weather collar over the 150mm
hole in the roof. Make good the tiling or slating around
the collar incorporating the flashing of the weather collar.
Position the angle cap over the weather collar in the correct
orientation to attain the correct angle for your roof. One way
round gives a pitch of 25°-38° and the other gives 37°- 50°.
(b) Flat Roof
Fit the aluminium weather collar over the 150mm hole in the
roof ensuring a weather tight seal.
Horizontal Pipes-Completion of Installation
Having built the pipe(s) from the boiler to the terminal(s), the
length of the final pipe piece can be determined. Cut pipes at
the opposite end to the ‘O’ ring seal making square and free
from burrs. Push the horizontal terminal through the wall to
engage the final pipe piece and pull back ensuring the grey
wall seals are fully pulled up to the outside and inside wall
faces.
Vertical Pipes-Completion of Installation
Refer to diagram 10.24.
For installation of (a), attach the twin pipe to concentric
flue adaptor, part number A2011600, to the base of vertical
terminal assembly. For installation of (b), attach the single
pipe to concentric adaptor, part number A2011500, to the
base of vertical terminal assembly.
With the vertical terminal assembly positioned in the roof,
the length of the final pipe can be determined. Cut the flue
to the desired length measuring from the ‘O’ ring seal end
and discard the plain end of the tube. The cut end should
be square and free from burrs. Carefully push the terminal
assembly upwards to allow room for fitting the final flue
piece(s). Fit a 100mm fixing bracket to the terminal assembly
Part No 2000460486. Pull the terminal assembly down and
join to the flue system. Ensure that the terminal is making
a weather tight seal on the weather collar. Secure the fixing
bracket fitted to the terminal to the roofing struts or a purpose
made batton.