Worcester WR325 RSF Installation And Servicing Instructions page 12

2) If L is within the range 127mm to 500mm then the flue can be
telescopically adjusted to the correct length (L + 70 mm for RH
side flue, L + 250 mm for LH side flue or L + 155 mm for rear
flue). The ducts are then fixed by drilling a pilot hole through the
hole in the air duct and screwing the self tapping screw provided
into the two ducts (see fig. 11).
3) If L is within any of the following ranges it will not be necessary
to cut the extension ducts:
0.88m to 1.10m, 1.63m to 1.85m or 2.38m to 2.5m.
Each extension duct must be connected to the first section of
flue or the previous extension duct by firstly fitting the inner flue
ducts together and pilot drilling and fixing (see fig. 12). Then the
outer air ducts can be similarly fixed using the pair of screws
provided. The flue terminal section can then be telescopically
adjusted and fixed as before (see fig. 11) ensuring the correct
length (L + 70 mm for RH side flues, L + 250 mm for LH side
flues, or L+ 155 mm for rear flues).
4) In the event of L not falling within any of the above ranges it
will be necessary to cut the FIRST extension length. The air
and flue duct lengths should both be reduced to the same length:
L - 240mm where one extension is used; L - 990mm with two
extensions and L - 1,740mm with three (see fig. 12). The flue
can then be assembled ensuring that the cut extension is fitted
to the turret duct assembly first and that the flue is adjusted to
the correct length of (L + 70 mm for RH side flues, L + 250 mm
for LH side flues, or L+ 155 mm for rear flues) (see fig 11).
5) Finishing the flue.
Apply the plastic tape provided to the last section of flue where
it will be sealed to the external brickwork.
Remove the front clamp from the boiler flue connection and
lower the flue duct sleeve by slackening the single locking screw
at the RH side of the internal flue duct (fig. 7).
Fit the turret complete with boiler adapter to the flue system.
From inside, push the assembly through the wall, align the flue
turret with the boiler flue connection. For side flues the turret
will need to be twisted into place through 90° to locate into the
boiler flue connection. Replace the clamp and raise the inner
flue connection and lock into place (fig. 7).
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Supplied By www.heating spares.co Tel. 0161 620 6677
Make good the intenal and external brickwork or rendering.
2
1
Fig. 11
1 -
2 -
10.6 INTERNAL FITTING OF THE DUCT ASSEMBLY
The rubber sealing gasket and the clamping ring are available
from Worcester Heat Systems. Measure and cut the ducts as
previously described for external fitting (Section 10.4). Fix the
ducts to the terminal and fit the rubber sealing gasket and clamp
to the terminal. Centralise the gasket and tighten the clamping
ring. See Fig. 14. Slide the flue centering ring onto the air duct
and tighten the screw. See Fig. 14. Fix the ducts and terminal
assembly to the flue turret and boiler as described in Section
10.4 preceding, together with the appropriate restrictor ring.
Apply the plastic tape provided to the last section of the flue
where it will be sealed to the external brickwork. Push the
assembly through the wall so that the gasket flange is against
the outside of the wall. See Fig. 14. 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 10.4
preceding together with the appropriate restrictor ring.
6) Fitting the restrictor ring
Refer to table 7 to select the correct restrictor ring depending
on the equivalent length of the flue system.
Remove the fan, as described in replacement of parts. Remove
the three screws holding the fan to its mounting plate and position
the appropriate restrictor in the recess on the fan mounting,
plate and refit the three screws securing the restrictor, mounting
plate and fan. Replace the fan on the boiler.
Fig. 12
3
1. Flue centering ring
2. Air duct
3. Flue duct
Adapter, boiler to turret
Adapter, item 1 to vertical flue
1
2 4
4. Rubber sealing gasket
5. Flue terminal
Rubber sealing gasket
Flue terminal
Clamping ring
Fig. 13
5
Fig. 14