Worcester 24SiII Installation And Servicing Instructions page 15

Fig. 24. Extension duct
Flue
turret
assembly
Appliance
Fig. 25. Flue duct length - side
Flue
turret
assembly
Fig. 26. Flue duct length - rear
Flue
turret
assembly
It is not necessary to cut the ducts
If L is between 1175 - 1475mm
1925 - 2225mm
*2675 - 2975mm
3425 - 3725mm
(* Maximum length 2500mm for LPG boilers)
Fixing screw
casing
Terminal
L
assembly
(1 extension)
(2 extension)
(3 extension)
(4 extension)
L
Fixing screw
Ducts of equal length
L
It will be necessary to cut the ducts
If L is between
(* Maximum length 2500mm for LPG boilers)
It is necessary to shorten the assembly by cutting the first
extension duct assembly eg. L = 1000mm - remove 175mm
from the air and flue ducts (1175 – 1000 = 175mm).
NOTE: Extension duct measurements do not include the
socketed end. Unless specifically instructed the socketed end
must not be removed.
Fix the flue ducts together before fixing the surrounding air duct,
the cut ducts fit into the terminal assembly.
11.10 Fitting the Flue Assembly with Access to the Terminal.
Prepare the flue duct assembly as described in Section 11.8.
Apply the plastic tape to the air duct to be in contact with the
external brickwork.
From inside push the assembly through the wall. Align the flue
turret and push fully onto the spigot on the appliance. Tighten
the clamping ring. Refer to Fig.27.
Make good the internal wall face and the external brickwork or
rendering.
11.11 Fitting of the Flue Assembly without access to the Terminal.
The rubber gasket kit is available from Worcester Heat Systems.
NOTE: A larger diameter opening in the wall is required. Refer to
Table 2.
15
Terminal
assembly
Terminal
assembly
725 - 1175mm (1 extension)
1475 - 1925mm (2 extension)
*2225 - 2675mm (3 extension)
2975 - 3425mm (4 extension)
3725 - 4000mm (5 extension)