Glow-worm sxi and Gas Valve - Manual (Page 19)

19 0020015347-03
6 Installation Preparation
6.2 Wall Template
Take the wall template from the documentation pack and place
in the desired position on a flat wall, giving due consideration to
boiler clearances, see section 2.2, and the flue you are fitting.
6.3 Flue Hole Cutting
The standard horizontal flues are designed with an internal
fall of 44mm/metre towards the boiler for disposal of condensate.
If the standard flue length alone is being used then the flue hole
of diameter 105mm can be cut in the position marked on the wall
template.
For standard side flues the horizontal flue centre line on the
wall template should be extended to the side wall, and the
vertical centre of the flue hole marked at 176mm from the back
wall.
For installations with external access, a 105mm diameter core
drill can be used.
For installations with internal access only, a 125mm diameter
core should be used.
When using extension pipes with the horizontal rear flue, a core
drill size of 125mm should be used to allow the extension pieces
to slope at 44mm/metre (2.5
o ) towards the boiler.
For extended side flues the flue hole centre should be
determined by extending the dashed inclined line on the template
to the side wall. This dashed line is drawn at 44mm/metre (2.5
o )
rise from the boiler. Where this line reaches the side wall, a
horizontal line should be marked. The vertical centre line of the
flue should then be marked at 176mm from the back wall, see
diagram 6.2.
To allow for the flue passing through the wall at this angle a
125mm hole should be drilled irrespective of internal or external
installation.
If necessary remove the wall template whilst drilling the flue
hole.
6.4 Fixing Jig and Hanging Bracket Fixing
Reposition the wall template over the flue hole and mark the
position of the fixing holes for the fixing jig, see diagram 6.3.
Drill the required fixing holes and insert suitable wall plugs.
NOTE: Due to the varied site conditions we do not supply fixings
and advise that the installer should supply those which are
suitable.
Secure the fixing jig to the wall.
Diagram 6.2
12890
WALL
TEMPLATE
EXTENDED SIDE FLUE
Ø 125
90°
176
2.5° 44mm/metre
Inclined Extended
flue length
Standard
flue length
Horizontal
SCREW
Diagram 6.3
12895
WALL
PLUG
WALL
TEMPLATE
FIXING JIG