Worcester WR325 RSF Installation And Servicing Instructions page 10

Allow water to flow to vent the system and close the taps.
h) If the appliance is not to be commissioned straight away, re-
fit the appliance casing and control knobs.
10.2 Installation of Flue
FLUE OPTIONS
The standard flue length is from 135mm to 615mm measured
from the appliance casing to the outer wall.
Extension flue kits, a vertical take-off adapter, and 90° flue bends
and 45° flue bends are available to increase the length and
redirect the flue as follows.
Horizontal balanced flue:
a) From 135mm to 3500mm straight flue.
b) From 135mm to 2500mm when a 90° flue bend is required.
c) From 135mm to 1500mm when two 90° flue bends are
required.
Vertical balanced flue:
a) From 500mm to 2600mm straight flue.
b) From 500mm to 2600mm when two 45° bends are required.
A 90° flue bend is equivalent to 1000mm of straight flue. A 45°
flue bend is to half a 90° bend.
Refer to Figs. 9 and 10 to determine whether extension kits,
90° flue bends, 45° flue bends, or adapters are required.
The maximum number of 90° flue bends allowed is two, in
addition to the flue turret
The flue turret can be replaced by a flue bend with no reduction
in flue length.
Flue components
1. Adapter, boiler to turret.
2. Adapter, item 1 to vertical flue.
3. Flue Turret.
4. Standard air duct.
5. Standard flue duct.
6. Restrictor rings, 4 off (Fan inlet).
7. Flue terminal.
8. Extension air duct.
9. Extension flue duct.
10. In-line flue elbows (45° and 90°).
10
Supplied By www.heating spares.co Tel. 0161 620 6677
1
2
Fig. 5
IMPORTANT:
To ensure the correct operation of the appliance a restrictor
ring must be fitted to the fan inlet, where applicable, to suit the
flue configuration used.
Refer to table 7 for relation of restrictor ring / flue length.
The flue must be installed as specified in BS 5440 Part 1.
NOTE: READ THIS SECTION FULLY BEFORE COMMENCING
INSTALLATION.
1. Horizontal
a) Without Elbows
Length (mm)
up to 2000
2001 - 3500
b) With 1 x 90° or 2 x 45° elbows
Length (mm)
up to 2500
c) With 2 x 90° elbows
Length (mm)
up to 1500
2. Vertical
a) Without Elbows
Length (mm)
up to 2600
b) With 2 x 45° elbows
Length (mm)
up to 2600
Fig. 6
Restrictor
54
-
Restrictor
-
Restrictor
-
Restrictor
-
Restrictor
-
Table 7