Ravenheat Little Star LS 80, Installation And Servicing Instructions

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7.27
7.27.1
7.27.3
7.27.4
7.27.5
7.27.6
Fig. 82
TO REMOVE/REPLACE THE CENTRAL
HEATING AND/OR HOT WATER CON-
TROL THERMISTOR
Remove the casing (sect. 7.3) and lower
the instrument panel (sect. 7.19.1 for
DHW).
Remove the wires that connect the ther-
mistor (Fig. 81).
Close the on/off valves for the heating cir-
cuit and the hot water circuit. Drain the boil-
er at drain point (Fig. 93) and drain hot
water from the lowest hot water tap and
drain point on DHW inlet cock (Fig. 46).
Undo the nut and withdraw the sensor (Fig.
81) from its pocket.
Replace in reverse order,
Fig. 83
7.28
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,
7.28.1
Remove the casing (sect. 7.3).
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 waler
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
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 top coach bolts then remove
boiler from the wall.
7.28.10 Remove the top bracket, and unscrew the
nut that connects the expansion vessel and
remove it (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 AIR
AUTOMATIC VENT (Fig. 92)
7.29.1 Remove the casing and the combustion
chamber front cover (sect. 7.3 & 4).
3 9