Potterton Performa 28i Installation And Servicing Instructions page 22

Elbow
Seal
Adaptor
Fig. 22
Seal
Clip
Screws
Fig. 23
Fig. 24
Clip
Fig. 25
22
Restrictor
Flue Duct
Flue Duct
Clamp
Screws
Air Duct
Seal
8.0 Installation
8.6 Fitting the Flue (Cont)
IMPORTANT: If the equivalent flue length is
greater than 1.5m the restrictor MUST be
removed from the adaptor (Fig. 22).
8. Take one of the rubber seals and position it on
the boiler flue adaptor. Engage the flue elbow on
the adaptor and pull the sleeve up so that it
equally covers the joint (Fig. 22).
9. Remove the screws from one of the clips
provided. Prise the clip apart and fit it over the
seal (Fig. 23). Set the elbow to the required angle.
10. Refit the screws to the clip and tighten them to
secure the elbow. Take the second rubber seal
and position it on the flue elbow.
11. Locate the flue duct clamp on the flue outlet
elbow. Draw the flue duct out of the air duct,
engage it in the clamp and tighten the screws
(Fig. 24).
12. Draw the air duct out of the wall and align it
with the elbow. Position the seal so that it equally
covers the joint (Fig. 25).
13. Remove the screws from the second clip
provided. Prise the clip apart and fit it over the
seal. Refit the screws to the clip and tighten them
(Fig. 25).
14. Where possible position the clips so that the
screws are not visible.
15. Make good between the wall and air duct
outside the building.
16. Fit the circular flue trim outside if required, and
if necessary fit a terminal guard (see Section 7.10
& 7.11).
8.7 Extensions & Additional Elbows
1. The method of connecting any flue extensions
or additional elbows is the same as that for
connecting the standard flue and 90° elbow as
described above.
2. If, for example, when a flue extension is
connected to a 90° elbow the flue duct will project
from the air duct at the unconnected end by the
same ammount as the flue duct spigot does from
the elbow . Further elbows or extensions can then
be added to this.
3. Similarly, a concentric flue can be connected to
the boiler adaptor in the same manner as it does
to the elbow to provide a vertical flue.
4. The additional 90° elbow available is identical
to the elbow supplied with the standard flue. 45°
elbows are of the same principle.
5. Extensions can be cut according to the
requirements of the installation.