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8.14 TO REMOVE/REPLACE FLUE
MANIFOLD .
8.14.1
Remove front casing (sect 8.1).
8.14.2
Unscrew and Gently Remove combustion
chamber cover assembly with gas valve,
fan ,burner and electrodes from combustion
chamber.as in sect. 7.2.2
8.14.3
Remove the heat exchanger as sect. 8.6.
8.14.4
Remove the two securing screws and pull
to remove the flue manifold.
8.14.5
Replace in reverse order.
NOTE: Always check the flue oring seal.
8.15 TO REMOVE/REPLACE DIVERTER
VALVE SWITCH .
8.15.1
Remove front casing (sect 8.1).
8.15.2
Detach the electrical plug and remove the
retaining clip.
8.16
TO REMOVE/REPLACE PUMP (Fig.62).
8.16.1
Remove front casing (sect 8.1).
8.16.2
Remove lower grill of the casing and lower
the instrument panel with the electrical
box.
8.16.3
Detach the supply wire connector from the
pump.
8.16.4
Remove the securing clip at the pump
manifold.
8.16.5
Remove the securing clip the fastens
the pressure gauge probe and expansion
vessel pipe to the pump.
8.16.6
Unscrew the nut at the expansion vessel
and remove the pipe.
8.16.7
Unscrew the nut that fastens the pump
to the CH pipe and remove the pump.
8.16.8
Replace in reverse order.
NOTE :
Alway use new seals when re-
fitting new pump.
8.17
TO REMOVE/REPLACE DIVERTER
VALVE.
8.17.1
Remove front casing (sect 8.1).
8.17.2
Close the on/off valves for the heating
circuit and the hot water circuit.
Drain the boiler at drain point on the pump
manifold and drain hot water from the
lowest hot water tap .
8.17.3
Remove diverter valve switch (sect.8.15).
8.17.4
Unscrew the diverter valve four nuts and
pull it out from boiler.
8.17.5
Replace in reverse order.
NOTE: Always use new seals.
8.17.6
Fill the boiler as described in sect.6.4 and
check for leasks.
8.18 TO REMOVE/REPLACE THE CENTRAL
HEATING AND/OR DOMESTIC HOT
WATER THERMISTOR (Fig.63).
8.18.1
Remove front casing (sect 8.1)and lower
the instrument panel .
8.18.2
Remove the wires that connect the
thermistor.
8.18.3
Remove the retainig clip from the pipe.
NOTE: When reconneting the polarity
of the wiring to thermistor is unimportant.
8.18.4
Replace in reverse order.
36
Fig.62
