Ariston Type C - Removing the Domestic Expansion Vessel; Removing the Overheat Thermostat; Removing the Pressure Gauge; Removing the Pressure Relief Valve

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18.3.7 Removing the expansion vessel
18.3.8 Removing the overheat thermostat
1. Remove the casing as in step 18.1.1;
2. Pull off the thermostat connections. Then
remove the thermostat from the pipe by
releasing it’s securing clip (see Fig. 95).
18.3.9 Removing the temperature sensors (N.T.C’s)
1. Remove the casing as in step 18.1.1;
2. Pull off the NTC connections. Then remove
the NTC from the pipe by releasing it’s
securing clip
(see Fig. 96).
Fig. 96
Fig. 95
18.3.6 Removing the pressure relief valve
1
.
C
arry out step
1
8.1.1
a
nd
1
8.3.1
;
2. Remove the clip securing the valve (see Fig.
9
5)
a
nd pull it toward you;
3. Reassemble in reverse order; take care to
e
nsure the valve is in the correct position;
F
ig. 95
Fig. 93
Fig. 94
1. Carry out step 18.3.1;
2. Isolate the gas supply and disconnect all pipe
connections;
3. Remove the boiler from the wall
4. Unscrew the nut U (see Fig. 93);
5
.
P
ull the expansion vessel to remove it
(
see Fig. 94)
;
6. Reassemble in reverse order.
U