Worcester WR325 RSF Installation And Servicing Instructions page 13

10.7 FLUE BENDS
See Figs. 15 and 16.
Measure distances X, Y and Z as appropriate.
RH Side flue duct length = X + 70 mm. See Fig. 15.
LH Side flue duct length = X + 250 mm.
Rear flue duct length = X + 155 mm. See Fig. 15.
Cut the flue and air ducts which are to make up the first section
X such that both the assemblies are of equal length (either X +
70 mm, X + 250 mm or X + 155 mm). Extensions will be
necessary to allow X to be larger than 250 mm. Any extension
ducts are fixed by drilling a pilot hole through the hole in the
duct or elbow and screwing the self tapping screw provided into
the two ducts. (See Fig. 15). The length Y is the distance between
bends the ducts must be cut to Y - 162 mm. The swaged ends
must be removed from the extension tube and only the air duct
needs fixing. See Fig. 15. Z is the final flue length from the last
elbow to the outside face of the external wall. The first duct
sections fitted to the elbow must have unswaged ends. The
length of the air ducts should be Z - 196 mm. The inner flue duct
must be 30 mm longer than the air duct. If Z - 196 mm is less
than 160 mm then the terminal section will need to be shortened
to the same length as the extension flue section fitted to the
elbow (length Z - 100). If flue extensions are needed to attain
the required length care must be taken to ensure that the last
section of flue is longer than 260 mm.
Each extension must be connected to the previous section of
flue or bend by firstly fitting the inner flue ducts togther and pilot
drilling and fixing as above (See Fig. 15). Then the outer air
ducts can be similarly fixed using a pair of screws provided.
The flue terminal section can then be telescopically adjusted
and fixed as before (See Fig. 15), ensuring the correct length of
Z - 41. The silicon sealant supplied should be applied to the
flue ducts which engage into elbows. See Fig. 15.
From inside, push the assembly through the wall. Align the flue
turret and adapter with the socket on the appliance, slide or
twist the turret into the boiler flue connection as described in
section 10.6 preceding, together with the appropriate restrictor
ring.
Make good the internal and external brickwork or rendering.
10.8 VERTICAL ADAPTER
Fit the vertical flue adapter to the boiler flue adapter in place of
the turret.
Measure and fit the flue as in Section 10.7 except the first section
length is X + 50 mm measured from the top of the vertical flue
adapter. The minimum length for X is 100 mm. See Fig. 16.
Supplied By www.heating spares.co Tel. 0161 620 6677
Vertical adapter with horizontal flue
10.9 FINAL INSTALLATION
Check that all the water and gas connections have been
tightened. Remove the 2 screws and the control panel cover
and connect the mains electrical supply to the appliance at
terminals L and N. See Figures 17 and 18. The electrical leads
must pass through the appropriate space in the control panel
and be fixed with the cable clamps provided. Refit the control
panel cover.
Test the gas supply pipework up to the appliance for soundness
as indicated in BS 6891. If the appliance is not to be
commissioned immediately, replace the cabinet casing. Check
that the gas supply, the electrical supply and the water
connections are all turned off. If the premises are to be left
unoccupied during frosty conditions, then drain any water from
the appliance and system.
Fig. 15
Fig. 16
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