3-Way Diverter Valve; 3-Way Diverter Valve Motor; Sensors - Worcester ZWBR 7-28 HE plus Installation And Servicing Instructions

9.3.4

3-way diverter valve

y Switch off the appliance.
y Disconnect appliance from the power supply.
y Turn off service cocks.
y Unplug connector from 3-way valve motor. Refer to
fig. 56.
y Pull out retaining clip.
y Remove motor.
y Disconnect the relief valve drain.
y Disconnect the pressure gauge by withdrawing the
clip and pulling out the capillary head.
y Undo pipe unions by withdrawing the clips.
y Remove 3-way valve.
Fig. 56
After refitting:
y Fill system, bleed and re-pressurise
(see Installation Instructions).
9.3.5

3-way diverter valve motor

y Switch off the appliance.
y Turn off the service cocks.
y Unplug connector from 3-way valve motor. Refer to
fig. 56.
y Pull out retaining clip.
y Remove motor.
6 720 610 597 GB (01.07)
9.3.6

Sensors

y Check that the appliance is electrically isolated.
Central Heating Flow Temperature Sensor –
Item 36, fig. 2, 52
y Pull-off the connector.
y Release the sensor clip and withdraw the sensor.
y Apply heat transfer paste to the replacement sensor.
Safety Temperature Limiter – Item 6, fig. 2, 52
y Pull-off the connectors.
y Unscrew the sensor.
Flue Temperature Limiter – Item 9, fig. 2, 52
y Pull-off the connectors.
y Unscrew the sensor.
Domestic Hot Water Temperature Sensor –
Item 6.1, fig. 2
y Check that the inlet water valve is closed and the
domestic hot water circuit is drained.
y Release and pull-off the connector.
y Unscrew the sensor.
Maintenance
43