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8.3.9
Pressure gauge
B Drain the appliance.
B Lower the facia. Refer to fig. 63.
B Twist the pressure gauge head anti-clockwise to
release it from the casing. Refer to fig. 2.
B Disconnect the capillary head from the rear by with-
drawing the clip and pulling out the head. Refer to
fig. 57.
8.3.10 Expansion vessel
B Drain the appliance.
B Undo the union connection at the base of the vessel.
Refer to fig. 2.
B Unscrew the top and bottom fixing screws and
remove the vessel.
B Set the pressure of the new vessel to that required by
the system.
8.3.11 Pressure Relief Valve
B Drain the appliance.
B Disconnect the drain pipe from the valve. Refer to
fig. 33.
B Pull-out the clip securing the valve.
B Pull-out the valve.
B Ensure that the replacement valve is fully entered
before fitting the clip.
8.3.12 Burner
B Refer to section 8.2.
8.3.13 Primary Heat Exchanger
B Drain the appliance.
B Check that the gas supply is turned off.
B Check that the appliance is electrically isolated.
B Remove the fan assembly complete with the gas/air
tube and mixer assembly. Refer to section 8.3.2.
B Remove the burner. Refer to section 8.2.
B Disconnect the sensors. Refer to section 8.3.6.
B Undo the central heating flow union.
B Undo the top connection of the pump. Refer to
fig. 57.
B Undo the grey plastic cap, next to the top pump con-
nection at the base of the heat exchanger.
B Unscrew and remove the condensate trap. Refer to
section 8.2.
B Unscrew and remove the two screws securing the
heat exchanger top bracket to the rear panel.
B Lift up the flue duct, item 271, refer to fig. 2.
B Pull forward from the top and lift the heat exchanger
from the casing.
B Transfer components, as necessary, to the new heat
exchanger.
6 720 611 443 GB (05.04)
B 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. 66
Maintenance
41
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