Worcester 24SiII Installation And Servicing Instructions page 53

Fig. 12. Vertical flue system (offset with 45° flue bends)
Height of offset
= D + 60mm
5. Installation of Flue
5.1 It may be necessary to deviate from the following
method of installation because of site conditions,
however, the joints must be sealed and fixed as described.
5.2 CUT DUCTS
When measurements have been made and checked, cut the
air and flue ducts to length ensuring that the cuts are square
and free from burrs.
All dimensions refer to straight lengths and do not include
the expanded ends. Do not cut the expanded ends unless
specifically instructed to do so.
5.3 POSITION OF THE FIRE STOP SPACER ASSEMBLY
Fit the fire stop spacer centrally over the hole in the ceiling.
Ensure the hole aligns with the flue spigot on top of the
appliance casing.
F
300mm
minimum
Height of terminal
assembly 1100mm
G = 1100mm - F
K
Flue terminal assembly
(106mm diameter)
(1.414 x D) - 60
Appliance front
Ceiling
Fire stop spacer
45° flue bends
Note: 45° bends may be applied
D
Note: For more information on
Mark the four fixing hole positions in each half for No.10 x
30mm wood screws (not supplied) and fix either into the
existing joists or into reinforcement nogs. Alternatively, the
plate may be fixed to the ceiling using plasterboard toggle
screws. Refer to Fig. 7.
5.4 POSITION OF THE FLUE DUCT SUPPORT BRACKET
From inside the roof space fit the support centrally over the
hole in the ceiling. Ensure the hole aligns with the fire stop
spacer and flue spigot on top of the appliance casing.
Mark and fix into position as previously described for the fire
stop spacer. Refer to Fig. 6.
Remove the fire stop spacer and support bracket until the
flue is assembled.
9
Air inlet flange
Weather sealing collar
(Secure with screw provided
and seal with silicone sealant)
Roof flashing (not supplied)
Flat roof
L = K - G
in any system layout as with
90° bends.
bends in flue see installation
and servicing instructions.