Worcester Highflow 400 RSF Installation And Servicing Instructions page 22

Fig. 20. Flue Option 3. Standard horizontal side flue.
Flue Option 4. Extension horizontal side flue.
Base outline of appliance
marked on floor
Standard horizontal side flue Ð
Flue Option 2: Dimension A = 1000 max.
Extension horizontal side flue Ð
Flue Option 4: Dimension A = 3000 max.
Ensure it is correctly located against the stop. Fully tighten the
clamping screw accessible on top of the inner casing. See Fig. 14.
Make good the internal and external brickwork or rendering.
11.6 Fitting Extension Flues and Extra 90° Flue Bend or
Bends.
The installation can now be continued by following the
appropriate instructions for the Flue Option listed in the
following table. See also Fig. 5.
Option.
No. Option
3 Extension horizontal rear flue. . . . . . . . . . . . . . . . . . . . . . . . . . . 11.6.1
4 Extension horizontal side flue. . . . . . . . . . . . . . . . . . . . . . . . . . . 11.6.2
5 Extension horizontal flue using a second 90° flue bend . . . . 11.6.3
6 Extension upwards and horizontal flue using a
second 90° flue bend. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.6.4
7 Extension horizontal flue using a second and third
90° flue bend. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.6.5
8 Extension upwards and horizontal flue using a second
and third 90° flue bend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.6.6
9 To fit a horizontal section of flue duct before the first 90°
flue bend for flue options 2, 4, 5, 6, 7 and 8. . . . . . . . . . . . . . . 11.6.7
11.6.1. EXTENSION HORIZONTAL REAR FLUE.
(FLUE OPTION 3). See Fig. 19.
IMPORTANT: i) Length of flue when measured from the rear of
the appliance casing must not exceed
3000 mm.
ii) A flue restrictor ring MUST be fitted into the
flue terminal. Refer to Section 11.3 for the
correct size and the following instructions for
fixing. See Fig. 24.
iii) The flue adaptor MUST be fitted to connect
the flue system to the appliance. See Fig. 21.
Refer to Section 11.3 and the following
instructions for fixing.
90¡ flue bend
Front of
appliance
Flue Section
Flue duct = (A + 284) mm
Air duct = (A + 244) mm
A
Distance from the side of
the base outline of the
appliance to the outside
surface of the wall
HORIZONTAL REAR FLUE ASSEMBLY.
Measure accurately the distance from the rear of the appliance,
previously marked on the floor, to the outside surface of the
wall.Dimension A mm. See Fig. 19.
Air duct length = A + 188 mm,
Flue duct length = A + 288 mm,
Cut the air and flue ducts to length. Do not cut the drilled end of
the air duct that will fit adjacent to the appliance.
IMPORTANT: Fit the flue restrictor marked 75 into the flue
terminal. See Fig. 24.
ASSEMBLE THE AIR DUCTS.
Continue the installation by following the procedure as described
in Section 11.3.
If necessary, assemble and check the air duct length. Drill two
holes through the holes, in the expanded end of each air duct
with the drill provided. Disengage each air duct and apply a
smear of silicone sealant around of the air duct to seal the joint.
See Fig. 23.
Reassemble and fix the air ducts together with the screws
provided.
ASSEMBLE THE FLUE DUCTS.
Follow the procedure for measuring,cutting,sealing and fixing as
described in Section 11.3.
Note: If the extension is longer than 1500 mm a flue duct
support must be fitted before the ducts are finally assembled.
The flue duct support must be fitted half-way along the flue duct
for effective support. See Fig. 23.
ASSEMBLE THE FLUE DUCT INTO THE AIR DUCT.
Assemble the air and flue ducts into the flue terminal. Ensure the
air duct fits fully into the flue terminal and the restrictor ring is
located firmly between the end of the air duct and flue terminal.
See Fig. 24. Drill through the holes in the flue terminal into the air
duct with the drill provided.
Apply a smear of silicone sealant to the end of the air duct and
fix into the flue terminal using the screws provided. See Fig. 23.
Note: Do not apply a smear of silicone sealant around the end of
the flue duct that fits into the flue terminal.
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Outside of wall