Worcester 24CDi, Installation And Servicing Instructions

Page: 16 / 40

12.12. 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 750mm of straight duct.
A 45° bend is equivalent to 375mm of straight duct.
A maximum flue assembly of 3m is possible with 1 X 90° bend and 2m
with 2 X 90° bends.
Measure the lengths X,Y and Z. Refer to Fig.25.
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.
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.25.
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.25.
If Z<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 in 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>725mm then two extension duct assemblies will be required, the
first assembly being cut to length as plain tubes.
If more than two extension ducts are needed in any section to achieve
the required length then the final section of the assembly must not be
less than 325mm without cutting the terminal assembly.
NOTE: The flue duct of the final extension must be 30mm longer than
the air duct.
Each section must be connected to the previous section of the flue bend
by fixing the flue ducts together and then similarly fixing the air ducts
which engage the elbows.
Fit the assembly as described in Section 12.10, 12.11. as appropriate.
Make good the internal and external brickwork or rendering.
12.13 Vertical Adapter for Horizontal Flues.
An adapter is available for an initial short section of vertical flue.
Measure and cut the flue as described in Section 12.12.
16
Fig. 25. Fitting the flue bends to the intermediate sections of the flue duct.
Fig.23 . Terminal assembly for internal
fitting of the flue.
5
4
1
3
2
1. Flue centering ring
2. Air duct
3. Flue duct 4. Rubber sealing gasket
5. Flue Terminal
Rubber sealing
gasket
Clamping ring
Flue terminal
Fig.24 . Flue Turret Fixing .
1
2
4
3
1. Flue turret assembly
2. Clamp 3. Appliance
4. Fixing Screws
Air Z – 81mm
Flue Z – 51mm
Z
Y
X
Y – 162mm
(plain tube)
Flue and air
duct = L
2
Air duct L
1
Flue duct L
1
– 14mm
Air duct L
3
Flue duct L
3
+ 15mm
37
▼
▼
37
▼
▼
37 ▼
▼
37
▼
▼