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Component Replacement - Page 39
6.21 Automatic Air Vent
a. Remove the white front case, base panel and white left
hand side panel. See 5.1, 5.2 & 5.3 in 'Routine
Maintenance'.
b. Close the central heating isolating valves, reduce the
system pressure by opening the pressure relief valve,
then part drain the water from the boiler by opening the
bleed valve on the right hand side of the diverter valve.
c.
Using a spanner to prevent the retaining nut from
rotating unscrew the auto air vent and remove from the
appliance. If there is insufficient space, removal will be
eased if the complete auto air vent and pipe assembly
is disconnected from the heat exchanger and then
raised above the top of the air box. To do this the fan
and fluehood will need to be removed, see 5.4 & 5.5 in
'Routine Maintenance'
d. Fit new air vent and sealing washer ensuring the air
vent cap is left loose.
Re-assemble in reverse order, ensure that the
grommet is correctly positioned. Re-charge the system
as described in section 1.6 and check for leaks.
6.22 Pressure Relief Valve
a. Remove the white front case and base panel.
See 5.1 & 5.2 in 'Routine Maintenance'.
b. Close the central heating isolating valves, reduce the
system pressure by opening the pressure relief valve,
then drain the water from the appliance by removing
the drain off screw on the underside of the pump
manifold.
c.
Undo the outlet tube nut and fully remove the two grub
screws holding the pressure relief valve to the pump
manifold, undo the top compression joint on the
pressure relief valve discharge pipe then remove the
valve.
Note: The outlet of the pressure relief valve is an olive
connection.
d. Fit the new pressure relief valve using a new 'O' ring
seal and soap solution as a lubricant. Re-assemble in
reverse order.
e. Recharge the system as described in section 1.6 and
check for leaks.
Part No. 27/20334
(See Fig. 30)
(See Fig. 31)
Component Replacement 39
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