4.5.3.4 Gas supply
The boiler is supplied with a 20 x 15
mm gas service valve (10, fig. 14). Fit
the 20 mm compression fitting to the
boiler gas inlet (11, fig. 14) and
tighten. Install a gas supply pipe not
less than 15 mm diameter and connect
to the gas service valve. (Ensure the
gas supply pipework is adequately
sized such that a 20 mbar - (8" w.g.) -
gas pressure is available at the boiler
inlet at full flow rate). Tighten all union
connections.
4.6 Connecting the flue
assembly to the boiler
Note : A flue restrictor ring is sup-
plied packed with the users and
installation instructions.
The restrictor should be used under
the following circumstances : -
Horizontal flues
Where a horizontal flue less than 1 m
in length is used.
(DO NOT fit the restrictor where the
horizontal flue is more than 1 m in
length).
Vertical flues
Where a vertical flue less than 1 m
(e.g. 1 m between the top of the
boiler and the bottom of the vertical
air / flue duct assemly) is used
(DO NOT fit the restrictor where the
vertical flue is more than 1 m in
length).
4.6.1 Horizontal Flue
Remove two screws (1, fig. 18) and
take off one half ring (2, fig. 18). If
necessary, fit the flue restrictor ring
(Note : It will be necessary to remove
both half rings if the flue restrictor ring
is to be fitted. The flue restrictor ring
should be placed on top of flue outlet
directly below the two half rings see
fig. 18a. One half ring should be
replaced immediately).
Place a 63 mm diameter x 35 mm
wide flue duct clamp (4, fig. 19)
loosely over the flue duct (1, fig. 19).
Place the 63 mm diameter x 25 mm
wide flue duct clamp (5, fig. 19) over
the flue gas connection on the boiler.
17
3
2
1
fig. 18a
GW 705/1
1
2
fig. 18
GW 592/1
5
4 1 2 3
fig. 19
GW 593/1
3
4
5
6
1
2
fig. 17
GW 823/1
