Ravenheat HE 85 A, Инструкция по установке и обслуживанию

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7.27.5 Undo the nut and withdraw the sensor (Fig. 81)
from is pocket.
7.27.6 Replace in reverse order.
7.28 TO REMOVE/REPLACE THE CENTRAL
HEATING EXPANSION VESSEL
In the unlikely event of failure of the central
heating expansion vessel it is recommended
a suitable expansion vessel be fitted exter-
nal to the boiler. It should be positioned 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.
7.28.1 Remove the front panel from the outer
casing (sect. 7.3) and lower the instrument
panel (sect. 7.16.2 & 3) and remove the con-
trol 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).
7.28.2 Close the on/off valve on the domestic cold
water, central heating and gas supply.
7.28.3 Drain domestic water from the lowest hot wa-
ter tap and drain point on DHW inlet cock (Fig.
46).
7.28.4 Drain the boiler (Fig. 93).
7.28.5 Disconnect all pipework connected to boiler.
7.28.7 Disconnect mains cables and any other con-
nections (room thermostat, programming
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 boiler from the
wall.
7.28.10 Unscrew the nut that connects the expansion
vessel and remove it (Fig. 91)
7.28.11 Remove the screw supporting expansion ves-
sel (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. 5.4.2)
7.29.3 Remove the fan assembly and the flue hood
(sect. 7.6 & 7 7).