Replacement Of Parts - Worcester WR 325 BF Installation And Servicing Instructions

The ball within the valve should move freely. Check by shaking.
Check the O-ring and replace if necessary.
Re-assemble in reverse order.
10.5 Re-assembling the appliance
Re-assemble the appliance in reverse order ensuring the
following:
1. The collector hood outlet duct correctly enters the flue
connecting duct.
2. The washer in the main gas line union connection is
correctly located.

11. Replacement of Parts

It is the law that any service work must be carried out by a
competent person such as British Gas or other Corgi registered
personnel.
Before commencing any service operation turn off the gas
supply at the main gas service cock.
11.1 Pilot burner/injector
Disconnect the pilot gas pipe and thermocouple at the gas valve
and pull off the red cable from the Piezo unit.
Disconnect the pilot gas pipe from the pilot burner and remove
from the appliance complete with seal. Take care not to lose the
pilot injector. Replace injector if necessary.
Remove the two screws retaining the pilot bracket and lift the
complete assembly clear complete with the red seal.
Pull off the pilot filter. Undo the screw fixing the spark electrode
/thermocouple retaining bar and lift these clear.
Replace the pilot burner/bracket and re-assemble in reverse
order.
11.2 Spark electrode/thermocouple
Follow the instructions in Section 11.1 and replace the faulty
component.
11.3 Main burner
Disconnect the pilot gas pipe and thermocouple at the gas valve
and pull off the red cable from the Piezo unit.
Disconnect the pilot gas pipe from the pilot burner and remove
from the appliance complete with seal. Take care not to lose the
pilot injector.
Remove the two screws retaining the pilot bracket and lift the
complete assembly clear.
Undo the union connection below the burner. Lift the burner
clear of the union and push the front of the burner up into the
combustion chamber so that it is standing vertically against the
rear. Pull the rear of the burner forward so that the burner is now
upside down and work out between the combustion chamber
skirt and gas pipe.
Replace the burner and re-assemble in reverse order taking care
that the seals around the igniter cable/thermocouple and pilot
gas pipe are correctly seated in the combustion chamber base
and the pilot injector has been fitted.
11.4 Heat exchanger
Remove the collector hood assembly by slackening the two
retaining screws and pulling the hood out of the flue connector
3. The seals around the igniter cable/thermocouple and pilot
gas pipe are correctly seated in the combustion chamber
base and the pilot injector has been fitted.
Turn on the gas supply at the main gas service cock and check
for gas soundness in accordance with the current edition of BS
6891 while the appliance is running.
Re-commission the appliance as detailed in Section 9.
duct. If the flue connector duct comes away with the collector
hood, separate them and push the connector duct back into the
stub in the balanced flue assembly making sure that it is fully
home and resting against the two stops protruding from the
sides of the stub duct.
Isolate the appliance from the incoming cold water supply and
drain down the appliance via the fitted drain cock.
Disconnect the heat exchanger inlet and outlet pipes at the
water section and at the base of the combustion chamber.
Remove the locknuts from the heat exchanger stubs and lift the
heat exchanger clear.
Replace the heat exchanger and re-assemble in reverse order.
11.5 Piezo unit
Pull off the two wires from the rear of the unit, unscrew the
plastic retaining nut on the control panel and push out the Piezo
unit.
Replace and re-assemble in reverse order.
11.6 Water section
Isolate the appliance from the incoming cold water supply and
drain down the appliance via the fitted drain cock.
Disconnect the four union connections.
Release the two screws between the water section and gas
section and pull the water section clear.
The diaphragm within the valve can be replaced by removing the
three fixing screws holding the valve body together.
The water filter fitted into the incoming cold water tapping can
be cleaned or replaced by pulling it out.
Re-assemble in reverse order.
11.7 Gas valve
Remove the water section as described in Section 11.6.
Disconnect the pilot gas pipe and thermocouple from the gas
valve.
Pull off the two cables from the rear of the Piezo unit.
Release the main gas pipe union connection below the
combustion chamber and lift the valve clear complete with the
control panel.
Remove the Piezo unit as described in Section 11.5.
Remove the control facia by taking out the four fixing screws and
lifting clear complete with slider knob.
Prise out the slider bar and remove the two screws retaining the
control frame and lift clear.
Replace the gas valve and re-assemble in reverse order.
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