Ravenheat Flue Boiler Installation And Servicing Instructions - page 39
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Fig. 83
7.28
7.28.1
7.28.2
7.28.3
7.28.4
7.28.5
TO REMOVE/REPLACE THE CENTRAL
HEATING EXPANSION VESSEL
In the unlikely event of failure of the central
heating expansion vessel it is recommend-
ed a suitable expansion vessel be fitted
external to the boiler. It should be posi-
tioned on the return pipe and as close to the
boiler as possible (Fig. 7).
However, if it is necessary to replace the
central heating expansion vessel the boiler
must be removed from the wall as follows.
Remove the front panel from the outer cas-
ing (sect. 7.3) and lower the instrument
panel (sect. 7.16.2 & 3) and remove the
control box cover (sect. 7.31.2/3).
Remove the lower grating (sect. 5.4.2).
Remove the two sides of the casing (sect.
5.4.5).
Close the on/off valve on the domestic cold
water, central heating and gas supply.
Drain domestic water from the lowest hot
water tap and drain point on DHW inlet cock
(Fig. 46).
Drain the boiler (Fig. 93)
Disconnect all pipework connected to
boiler.
7.28.7
Disconnect mains cables and any other
connections (room thermostat, program-
ming clock).
7.28.8 Remove the duct proceeding in reverse
order as described in (sect. 5.5 or 5.7).
7.28.9 Remove the 2 lower coach bolts and
release 2 top coach bolts then remove boil-
er from the wall.
7.28.10 Unscrew the nut that connects the expan-
sion vessel and remove it (Fig. 91).
7.28.11 Remove the screw supporting expansion
vessel (Fig. 91).
7.28.12 Remove the expansion vessel.
7.28.13 Replace all the components in reverse
order using new seals.
7.28.14 Fill the system as described in the sect. 6
and check for leaks.
7.29
TO REMOVE/REPLACE THE AUTOMATIC
AIR VENT (Fig. 92)
7.29.1
Remove the front panel from the outer cas-
ing and the combustion chamber front
cover (sect. 7.3 & 4).
7.29.2
Remove the lower grating (sect. 54.2).
7.29.3
Remove the fan assembly and the flue hood
(sect. 7.6 & 7.7).
7.29.4
Close the on/off valves for the central heat-
ing circuit and drain the water from the boil-
er drain point (Fig. 93).
7.29.5
Unscrew and remove the plastic cap that
protects the valve vent hole.
7.29.6
Disconnect the unions 1 (Fig. 92) slightly
turn and remove auto air vent.
7.29.7
Replace in reverse order, using new seals.
7.29.8
F i l l t h e s y s t e m a s d e s c r i b e d i n t h e
sect. 6.4 & 5 and check for leaks.
7.30
TO REMOVE/REPLACE THE PRESSURE
RELIEFVALVE (Fig. 93)
7.30.1
Remove the front panel (sect. 7.3) and the
lower grating (sect. 5.4.2) from the outer
casing, lower the instrument panel (sect:
7.16.2 & 3).
Remove right side of the casing (sect.
5.4.5).
7.30.2
Close the on/off valves for the heating sys-
tem and drain the water from the drain point
(Fig. 93).
39