Worcester Highflow 400 RSF Installation And Servicing Instructions page 23

Fit the flue adaptor to the air and flue ducts and assemble the
flue system. Follow the procedure as described in Section 11.3
and 11.4 to fit the flue adaptor and assemble the flue system.
The flue system is now assembled.
From inside or outside the dwelling pass the flue assembly
through the hole/holes in the wall/walls.
Temporarily support the flue system, ensure it is horizontal and
will align with the flue position, located on the rear of the
appliance.
Carefully ease the appliance into the position previously marked.
Ensure the flue location is correctly aligned with the centre-lines
of the flue.
Fit the flue adaptor into the flue grommet located on the rear of
the inner casing. See Fig. 23.
Ensure it is located correctly against the stop. Fully tighten the
clamping screw accessible on top of the inner casing. See Fig. 14.
NOTE: i) Do not apply a smear of silicone sealant around the
end of the flue duct that fits into the flue terminal.
ii) Flues longer than 1500 mm must be adequately
supported. Air duct support brackets are available
as an optional extra. See Section 5b.
iii) Make good the internal and external brickwork or
rendering.
11.6.2. EXTENSION HORIZONTAL SIDE FLUE.
(FLUE OPTION 4). See Fig. 20.
IMPORTANT: i) Length of flue when measured from the side 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) A flue adaptor is not required.
HORIZONTAL SIDE FLUE ASSEMBLY.
Measure accurately the distance from the side of the appliance,
previously marked on the floor, to the outside surface of the wall.
Dimension A mm. See Fig. 20.
Air duct length = A + 244 mm,
Flue duct length = A + 284 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 ring marked 77 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.
Fit 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.
Note: Do not apply a smear of silicone sealant around the end of
the flue duct that fits into the flue terminal.
Fit the flue duct into the flue bend. Ensure it is located correctly
against the stop. Drill two holes through the holes in the bend.
See Fig. 23.
Fit the air duct over the outside of the flue bend. Ensure it is
located correctly against the stop. Drill two holes through the
holes in the air duct.
Disconnect the air and flue ducts from the flue bend.
Loosely assemble the flue duct into the air duct and engage in
the flue terminal.
From outside the dwelling pass the assembly through the hole in
the wall.
From inside ease the flue duct sufficiently clear of the air duct to
fit the flue bend.
Apply a smear of silicone sealant around the outside of the flue
duct. Fit the flue duct into the flue bend and fix with the screws
provided. See Fig. 23.
Apply a smear of silicone sealant around the outside of the flue
bend.
Assemble the flue bend into the air duct and fix with the two
screws provided.
Ensure the flue duct is correctly engaged in the flue terminal. 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.
The flue system is now assembled.
Temporarily support the flue system, ensure it is horizontal and
the flue bend will align with the flue position, located on the rear
of the inner casing. See Fig. 23.
Carefully ease the appliance into the position previously marked.
Ensure the flue position is correctly aligned with the flue centre-
lines previously marked
Fit the flue bend into the flue grommet located on the rear of the
inner casing See Fig. 23.
Ensure it is located correctly against the stop. Fully tighten the
clamping screw accessible on top of the inner casing. See Fig. 14.
NOTE: i) Do not apply a smear of silicone sealant around the
end of the flue duct that fits into the flue terminal.
ii) Flues longer than 1500 mm must be adequately
supported. Air duct support brackets are available
as an optional extra. See Section 5b.
iii) Make good the internal and external brickwork or
rendering.
11.6.3. EXTENSION HORIZONTAL FLUE USING A SECOND
90° FLUE BEND.
(FLUE OPTION 5). See Fig. 25.
IMPORTANT: i) The two lengths of straight air duct when
added together must not exceed 2300 mm.
ii) A flue restrictor ring is not required.
iii) A flue adaptor is not required.
Refer to the instructions in Section 11.3.
First flue length from the appliance to the second flue bend.
The first flue bend will fit into the flue position located on the rear
of the inner casing. See Fig. 25.
Measure the horizontal distance between the centre of the flue
position located on the rear of the inner casing and the centre of
the second flue bend.
Dimension B. See Fig. 25.
Dimension B must not be less than 210 mm.
Air duct length = B – 166 mm
Flue duct length = B – 152 mm
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