Commissioning - Worcester WR 325 BF Installation And Servicing Instructions

(b) Lay the appliance on its back and pull off the Temperature
Control Knob.
(c) Unscrew the plastic Temperature Control Knob housing.
(d) Remove the four casing screw covers. Take out the four
casing fixing screws and lift the casing clear.
(e) Remove the collector hood from the appliance by slackening
the two fixing screws and lifting the hood clear.
(f) Lift the appliance on to the two mounting studs which are
part of the flue kit assembly and fix in position using the two
slotted nuts supplied.
If required, there are fixing holes situated on the appliance back
plate. Mark the fixing hole positions on the wall. Remove the
appliance. Drill and plug the wall and then re-fit the appliance.
(g) Push the flue gas connecting duct into the flue duct stub in
the balanced flue assembly making sure it is fully home and
resting against the stop protruding from the base of the stub
duct. Ensure flue gas connecting duct has been cut to the correct
size. See the Flue Kit Installation Instructions.
(h) Re-fit the collector hood making sure that the flue duct spigot
on the collector hood enters the flue duct connector. Tighten the
two collector hood fixing screws. Connect the gas supply pipe to
the appliance via a gas service cock.
Note: The whole of the gas installation should be inspected and
tested for soundness and purged in accordance with the
recommendations of BS 6891.
(i) Fit the two chrome water fittings supplied using fibre washers.
The fitting which includes the stop valve should be fitted onto
the rear right hand connection (viewed from the front) and the
other fitting onto the rear left hand connection (viewed from the
front).
(j) Fit the two copper tails supplied to the chrome water fittings
using a jointing compound suitable for use with potable water.
(k) Connect the appliance to the incoming cold water supply via
the fitting which includes the stop valve.
(l) Connect the appliance to the domestic hot water remote draw
off points via the other fitting.
(m) At the bottom centre of the water section assembly there is
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an additional in. male threaded joint which is the connecting
/ 2
thread for when a spout is connected for an oversink installation.
See General Information paragraph 2.10.
This outlet will not pass water until such time as an integral tap
kit is installed on to the appliance and therefore, in a normal
remote draw off installation, the
should be left unconnected and unplugged.
(n) Turn on the water supply to the appliance. Open the stop
valve on the inlet fitting to the appliance and then open the
highest hot water tap in the installation.
Allow water to pass in order to vent the system of air. Close the
tap.

9. Commissioning

Before commissioning the appliance, the whole gas installation
must be purged and tested for gas soundness in accordance with
the current edition of BS 6891.
Important: Open all doors and windows. Extinguish naked lights
and do not smoke while purging the gas line.
(a) Ensure that the gas service cock in the gas inlet pipe is
turned off.
(b) Loosen screw A and connect a pressure gauge to the test
point. See Fig. 4.
(c) Turn on the gas service cock.
(d) Move the gas control slide to the ignition position. See Fig. 5.
Observe the pilot burner through the observation window. Press
in the centre button of the control slide and hold depressed while
pushing in the Piezo igniter button two or three times. The pilot
1
in. male threaded joint
/
2
Fig. 4. Inlet pressure test point
should light. Wait 20 seconds and then release the centre button
of the control slide.
The pilot should remain alight. If the pilot is not established,
repeat the operations until a flame is established.
Note: On initial light up, or after prolonged shut-down, the
establishment of the pilot may take several attempts due to the
presence of air in the gas supply pipe.
The pilot flame should envelope approximately 5 mm of the
thermocouple head.
(e) Move the control slide fully to the right. See Fig. 6. Fully open
any hot water tap. The main burner should light.
(f) Check the dynamic inlet gas pressure. The pressure for natural
gas should be 20 mbar and the pressure for LPG should be 37
mbar.
Fig. 5. Gas control slide – ignition position
Gas control slide in this position
Fig. 6. Gas control slide – operating position
Gas control slide in this position
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Front
Piezo igniter
Piezo igniter