Worcester Highflow 400 RSF Installation And Servicing Instructions page 24

The section of horizontal air and flue duct fitted adjacent to the
first flue bend will not require expanded ends. Cut off the
expanded ends from this section.
SECOND FLUE LENGTH.
Measurer the distance between the centre of the second flue bend
and the outside surface of the wall. Dimension C. See Fig. 25.
Air duct length = C – 58 mm.
Flue duct length = C – 14 mm.
Assemble the air and flue ducts as described in Sections 11.3,
11.4 and 11.5 with attention to the following:
Fit the flue terminal and second flue bend to the second flue
length.
Ensure the air duct is fixed at both ends and the flue duct fixed
to the flue bend only. Fix with the screws provided. See Figs. 25
and 26.
Fit the first flue length to this flue bend followed by the first flue
bend.
Ensure the first flue bend is aligned correctly with the appliance.
Fix each end of the air duct to the bends with the screws
provided.
The flue duct must fit correctly between the flue bends. The flue
duct is trapped between the flue bends and does not require
fixing screws. See Fig. 26.
Follow the procedure for fixing the assembly to the appliance as
described in Section 11.6.2.
11.6.4. EXTENSION FLUE UPWARDS AND HORIZONTAL
USING A SECOND 90° FLUE BEND.
(FLUE OPTION 6). See Fig. 27.
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) The 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.
Measure the distance upwards 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. 27.
Dimension B must not be less than 210 mm.
Air duct length = B – 166
Flue duct length = B – 152
The upward section of air and flue duct fitted adjacent to the first
flue bend will not require expanded ends. Cut off the expanded
ends from this section.
Second flue length.
Measurer the distance between the centre of the second flue
bend and the outside surface of the wall. Dimension C.
Air duct length = C – 58 mm.
Flue duct length = C – 14 mm.
Assemble the air and flue ducts as described in Sections 11.3,
11.4 and 11.5 with attention to the following:
Fit the flue terminal and second flue bend to the second flue
length.
Ensure the air duct is fixed at both ends and the flue duct fixed
to the flue bend only. Fix with the screws provided. See Figs. 26
and 27.
Fit the first flue length to this flue bend followed by the first flue
bend.
Ensure the first flue bend is aligned correctly with the appliance.
Fix each end of the air duct to the flue bends with the screws
provided.
The flue duct must fit correctly between the flue bends. The duct
is trapped between the flue bends and does not require fixing
screws. See Fig. 26.
Follow the procedure for fixing the assembly to the appliance as
described in Section 11.6.2.
11.6.5. EXTENSION FLUE HORIZONTAL USING A SECOND
AND THIRD 90° FLUE BEND.
(FLUE OPTION 7). See Fig. 28.
IMPORTANT: i) The three lengths of straight air duct when
added together must not exceed 1000 mm.
ii) A flue restrictor is not required.
iii) A flue adaptor is not required.
Refer to the instructions in Section 11.3.
Refer to Section 11.6.3 and measure Dimension B and C. See Fig. 28.
For this flue option Dimension B is the centre distance between
each flue bend. The dimension may vary between each bend.
The minimum dimension must not be less than 210 mm.
First and second flue lengths:
Air duct length = B – 166 mm.
Flue duct length = B – 152 mm.
Third flue length:
Air duct length = C – 58 mm.
Flue duct length = C – 14 mm.
Assemble the air and flue ducts as described in Section 11.3 and 11.5.
Before fixing each section of duct, ensure each flue bend is
aligned correctly.
Follow the procedure for fixing the assembly to the appliance as
described in Section 11.6.2. See Figs. 26 and 28.
11.6.6. EXTENSION FLUE UPWARDS AND HORIZONTAL
USING A SECOND AND THIRD 90° FLUE BEND.
(FLUE OPTION 8). See Fig. 29.
IMPORTANT: i) The three lengths of straight air duct when
added together must not exceed 1000 mm.
ii) A flue restrictor is not required
iii) A flue adaptor is not required.
Refer to the instructions in Section 11.3.
Follow the instructions in Section 11.6.5.
Refer to Section 11.6.4 and measure Dimension B and C. See Fig. 29.
For this flue option Dimension B is the centre distance between
each flue bend. The dimension may vary between each bend.
The minimum dimension must not be less than 210 mm.
Upwards Section:
Air duct length = B – 166 mm.
Flue duct length = B – 152 mm.
Horizontal Section:
First Section:
Air duct length = B – 166 mm.
Flue duct length = B – 152 mm.
Second Section:
Air duct length = C – 58 mm.
Flue duct length = C – 14 mm.
Assemble the air and flue ducts as described in Section 11.3 and 11.5.
Before fixing each section of duct, ensure each flue bend is
aligned correctly.
Follow the procedure for fixing the assembly to the appliance as
described in Section 11.6.2. See Figs. 26 and 29.
11.6.7. TO FIT A HORIZONTAL SECTION OF FLUE DUCT
BEFORE THE FIRST 90° FLUE BEND FOR FLUE
OPTIONS 2, 4, 5, 6, 7 AND 8.
(FLUE OPTION 9). See Fig. 30.
IMPORTANT: i) The total length of straight flue including this
section MUST not exceed the length stated in
the Flue Option chosen.
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