Worcester C1 Installation And Servicing Instructions page 15

Fig.23. Flue duct length - rear
Flue
turret
assembly
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 flue 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 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 and fix with the screw provided. Refer to Fig.
24.
Make good the internal wall face and the external brickwork or
rendering.
11.11 Fitting of the Flue Assembly without access to the Terminal.
A rubber gasket kit is available from Worcester Heat Systems.
NOTE: A larger diameter opening in the wall is required. Refer to
Table 2.
Prepare the flue assembly as described in Section 11.8.
Fit the rubber sealing gasket centrally onto the terminal
assembly and tighten the clamp. Refer to Fig. 25.
Apply the plastic tape to the air duct in contact with the external
brickwork.
From inside push the assembly through the wall so that the
gasket flange is against the outer face. Refer to Fig. 25.
It may be necessary to adjust the legs of the flue centering ring.
Align the flue turret and push fully onto the socket on the
appliance. Tighten the clamping ring and fix with the screw
provided. Refer to Fig.24.
Seal the gap around the duct at the inner wall face with the
flexible seal provided and make good.
11.12 Flue Bends.
90° and 45° bends are available. A maximum of two bends may
be used in addition to the first bend on the flue turret.
A 90° bend is equivalent to 1m of straight duct.
A 45° bend is equivalent to 0.5m of straight duct.
A maximum flue assembly of 2m is possible with 1 X 90° bend
and 1m with 2 X 90° bends.
Measure the lengths X,Y and Z. Refer to Fig.26.
The maximum value of X using the turret assembly only is
506mm. Reduce the ducts to the appropriate length i.e. X =
406mm, cut 100mm from the air duct and 120mm (to cover the
entry into the 45° or 90° elbow) from the flue duct. Refer to
Fig.27.
Terminal
L
assembly
Fig.24 . Flue Turret Fixing
1
2
3
1. Flue turret assembly
2. Clamp
3. Appliance
4. Fixing Screw
Fig.25 . Terminal assembly for internal
fitting of the flue.
Flue centering ring
Air duct
Flue duct
NOTE: The flue system ducts between the elbows, dimension Y,
requires the socketed ends (of the first extension if two or more
are used) to be removed and the air and flue tubes to be cut to
the same length.
Cut the ducts to a length Y - 162mm. Refer to Fig.26.
The final section, dimension Z, of the flue system must include a
section of plain duct assembly i.e . an extension assembly with
the sockets removed. Reduce the final section, including the
terminal assembly, by the appropriate amount i.e. Air duct Z -
81mm and the flue duct Z - 51mm. Refer to Fig.26.
If Z is less than 425mm it will be necessary to cut the air and flue
ducts of the extension to a plain length of 100mm and reduce
the length of the terminal assembly i.e Z=350mm - remove
75mm from the terminal assembly.
If Z is 425 - 725mm it is not necessary to cut the terminal
assembly or use a second extension duct as the length can be
set telescopically.
If Z is greater than 725mm then two extension duct assemblies
will be required, the first assembly being cut to length as plain
tubes.
15
4
Fixing clamp
Flue Terminal
Rubber sealing gasket
Rubber sealing
gasket
Flue terminal
Clamping ring