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8.19 TO REMOVE/REPLACE OVERHEAT
THERMOSTAT (Fig.63).
8.19.1
Remove front casing (sect 8.1.4)
8.19.2
Remove the two wires that connect to the
overheat thermostat.
8.19.3
Remove the two screws securing the
thermostat to the pipe and pull it out.
8.19.4
Replace in reverse order
8.20
TO REMOVE/REPLACE AUTOMATIC AIR
VENT (Fig.64).
8.20.1
For access ,remove front casing (sect 8.1.4).
8.20.2
Close the on/off valves for central Heating
circuit and drain the water from the boiler.
8.20.3
Remove the pump see sect.8.16
.
8.20.4
Remove the retainig clip .
8.20.5
Pull the automatic air vent from the pump.
8.20.6
Replace in reverse order and check for leak.
NOTE: Fit a new “O” ring
8.21
TO REMOVE/REPLACE LOW WATER
PRESSURE SWITCH ( Fig.64A) .
8.21.1
Remove front casing (sect 8.1.4).
8.21.2
Close the on/off valves for central Heating
circuit and drain the water from the boiler.
8.21.3
Pull wires off and unscrew the low water
pressure switch from pump manifold.
8.21.4
Replace in reverse order, fill the system as
described in sect.6.4 and check for leaks.
NOTE:
Polarity of the wires is important
8.22
TO REMOVE/REPLACE SAFETY
DISCHARGE VALVE .
8.22.1
Remove front casing (sect 8.1).
8.22.2
Close the on/off valves for central Heating
circuit and drain the water from the boiler.
8.22.3
Unscrew the screw below the valve.
8.22.4
Remove the securing clip and remove the
pipe. Detach the valve.
8.22.3
Replace in reverse order, use a fill the system
as described in sect.6.4 and check for leaks.
Fig.63
Fig.64
Fig.64A
37
