Preliminary Work
1.
The carton contains, in addition to the heater and these instructions, a template, a flue gasket, screws
to fasten the flue to the heater and screws and plugs to fasten the heater to the wall.
2.
Place the template on the wall in the required position, and mark the position of the flue hole. Remove
the template.
3.
Using a suitable drill and masonry cutter fitted with pilot drill, drill a hole 65mm (2½") diameter
straight and level through the wall. Take care to prevent chipping of bricks on the outside face of the
wall. N.B. ON WALLS WITH COMBUSTIBLE INTERNAL CLADDING, REMOVE THE CLADDING
WITHIN 25mm (1") OF THE FLUE DUCTING.
4.
Replace the template so that the flue position on the template is concentric with the hole just drilled,
level the top of the template and mark the position of the four fixing holes.
5.
Drill the fixing holes 6mm (¼") diameter x 40mm (1½") deep and fit the wall plugs provided .
6.
If the hole for the flue cannot be drilled, but must be cut with a chisel, a kit (No. 590300), which
provides a finishing plate for the outside face of the wall must be used. Alternatively, the wall can be
made up with cement to leave a hole 65mm (2½") diameter.
7.
If the wall on which the heater is to be mounted is made of combustible material, another kit,
(No. 598600) which provides a wall liner and finishing plate, is available.
8.
If the wall is less than 125mm (5") thick, it must be built up behind the heater to give an overall depth
of wall of at least 125mm (5").
Preparation of the Flue
Three standard lengths of flue are available. Each flue is packed in a carton together with a piece of sealing
tape:-
Long FX3 Suitable for walls from 355mm (14") to 510mm (20")
Medium FX2 " " " " 205mm ( 8") to 355mm ( 14")
Short FX1 " " " " 125mm ( 5") to 205mm ( 8")
Flues of lengths above 510mm (20") and up to 1525mm (60") are also approved for Natural Gas and two flues in
this range are available to special order. These Flues are:-
FX4 Suitable for walls from 510mm (20") to 865mm (34")
FX5 Suitable for walls from 865mm (34") to 1525mm (60")
For operation on L.P.G. flues up to 865mm (34") only are approved. That is:-
THE FX5 FLUE MUST NOT BE FITTED TO HEATERS OPERATING ON L.P.G.
All flues consist of two concentric tubes. Combustion air is drawn into the heater through the outer tube and flue
gases return through the inner one. Both tubes are tele-scopic. See Fig. 2.
1.
Measure the length of the hole cut for the flue through the wall and add 6mm (
1/4
") to give dimension
A (Fig. 2).
2.
Remove the self tapping screw from the outer tube of the flue and adjust the overall length of the
outer tube, measured between the outsides of the end flanges, to the flue length A.
3.
Tape together temporarily the two parts of the outer tube to maintain the length A and drill a hole
3.5mm diameter (No. 29) through the hole for the self tapping screw. Re-fit the screw and wrap the
sealing tape, which is packed in the flue carton, round the joint.
4.
It is NOT necessary to adjust the inner tube in any way. The 22mm (
7/8
") projection is automatically
maintained as the inner and outer tubes are fixed together.
5.
In the case of flues of length 915mm (3ft) and above, the flue is set to length as detailed in paras. 1 to
3 above. No sealing tape is required. It is necessary to cut the flue tube using the gauge provided, to
the length of 22mm (7/8") as shown in Fig. 2. This dimension is important so it must be cut accurately
and burrs removed.
FIG. 1
4
