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8.3.6
Electrode assembly
y Refer to section 8.2.
y Use a new seal if the existing seal is damaged.
8.3.7
Pressure gauge
y Drain the appliance.
y Lower the facia. Refer to fig. 58.
y Twist the pressure gauge head anti-clockwise to
release it from the casing. Refer to fig. 2.
y Disconnect the capillary head from the rear by with-
drawing the clip and pulling out the head.
8.3.8
Expansion vessel
y Drain the appliance.
y Undo the union connection at the base of the vessel.
Refer to fig. 2.
y Unscrew the top and bottom fixing screws and
remove the vessel.
y Set the pressure of the new vessel to that required by
the system.
8.3.9
Pressure Relief Valve
y Drain the appliance.
y Disconnect the drain pipe from the valve. Refer to
fig. 30.
y Pull-out the clip securing the valve.
y Pull-out the valve.
y Ensure that the replacement valve is fully entered
before fitting the clip.
8.3.10 Burner
y Refer to section 8.2.
8.3.11 Primary Heat Exchanger
y Drain the appliance.
y Check that the gas supply is turned off.
y Check that the appliance is electrically isolated.
y Remove the fan assembly complete with the gas/air
tube and mixer assembly. Refer to section 8.3.2.
y Remove the burner. Refer to section 8.2.
y Disconnect the sensors. Refer to section 8.3.4.
y Undo the central heating flow union.
y Undo the top connection of the pump. Refer to
fig. 58.
y Undo the grey plastic cap, next to the top pump con-
nection at the base of the heat exchanger.
y Unscrew and remove the condensate trap. Refer to
section 8.2.
y Unscrew and remove the two screws securing the
heat exchanger top bracket to the rear panel.
y Lift up the flue duct, item 271, refer to fig. 2.
6 720 610 596 GB (01.07)
y Pull forward from the top and lift the heat exchanger
from the casing.
y Transfer components, as necessary, to the new heat
exchanger.
y Ensure that all the seals are in place and all of the
connections are tight before re-commissioning the
appliance.
6 720 610 602 - 06.10
Fig. 60
Maintenance
39
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