Worcester WR325 RSF Installation And Servicing Instructions page 4

Appliance water flow diagram.
4 Control unit
10 Water flow rate control
17 Gas valve
25 Water filter
28 Hot water outflow pipe
29 Cold water inlet pipe
31 Water flow rate regulator
35 Gas supply pipe
36 Drain plug
38 Diaphragm
39 Venturi
40 Slow ignition valve
42 Gas filter
47 Burner pressure test point
49 Burner injector
50 Burner
4
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55 Heat exchanger
66 Restrictor
96 Microswitch
100 Adjusting screw for temperature setting
112 Solenoid valve
113 Main valve
117 Igniter electrodes
118 Sensor electrode
119 Safety temperature limiter
220 Flue terminal
221 Concentric air/flue duct
224 Differential air pressure sensor
226 Fan
228 Differential air pressure switch
229 Combustion chamber
Fig. 1