9
Front panel:
Lift front insulation panel free from retaining lug on
combustion chamber cover.
Rear panel:
●
Lift rear insulation panel free from retaining lug at
rear of combustion chamber by tilting forward.
Side panels:
●
Lift side panels free from retaining lugs on combus-
tion chamber sides by tilting slightly.
●
Fit replacement insulation panels in reverse order
to removal
●
Refit combustion chamber cover, heat exchanger,
flue hood and fan in reverse order to removal.
To replace burner
●
Remove burner as described in '
Routine Cleaning
and Inspection
'.
Assemble replacement burner, supplied in parts, as
follows:
●
Fit burner injectors to burner injector bar and tighten.
Note:
Make sure that injector size, marked on each
injector, is the same as that given in ‘
Technical Data
’
for the type of gas being used.
●
Fit injector bar into burner, secure using four screws.
●
Fit replacement burner into boiler in reverse order
to removal.
To replace burner injectors
●
Remove burner as described in '
Routine Cleaning
and Inspection
'.
●
Unscrew and remove four injector bar retaining
screws and separate injector bar from burner.
●
Unscrew and remove injectors from injector bar.
●
Fit replacement injectors to injector bar and tighten.
Note:
Make sure that injector size, marked on each
injector, is the same as that given in ‘
Technical Data
’
for the type of gas being used.
●
Reassemble burner and fit into boiler in reverse order
to removal.
To replace ignition/flame sense electrode
●
Remove burner as described in ‘
Routine Cleaning
and Inspection
’.
●
Undo and remove screw securing electrode onto
burner.
●
Fit replacement electrode onto burner in reverse
order to removal.
●
Refit burner into boiler in reverse order to removal.
REPLACEMENT OF PARTS
To replace central heating expansion vessel
●
Drain down heating circuit of boiler only as
described in '
To replace pump
'.
Note:
It is not necessary to drain down entire heating
system to carry out this work.
●
Isolate electrical supply to boiler.
●
Undo pipe coupling at base of expansion vessel.
●
Supporting expansion vessel, unscrew and remove
screws securing expansion vessel to boiler.
●
Lift vessel out of boiler.
●
Fit replacement vessel to boiler in reverse order to
removal, ensuring that sealing washer is fitted to pipe
connection before tightening.
●
Ensure that expansion vessel charge pressure is 1,0
bar (15 psi) using a pressure gauge. If necessary,
increase pressure using a car or cycle tyre pump
connected to the Schrader valve.
●
Open isolating valves on flow and return connec-
tions, refill, vent and pressurise boiler.
●
Check for leaks.
To replace domestic expansion vessel
To replace domestic expansion vessel it is necessary
to drain entire storage cylinder, preferably when cold.
●
Isolate electrical supply to boiler.
●
Close isolating valve (
c
) on cold water inlet pipe,
see diagram 3
.
●
Drain upper section only of storage cylinder by
attaching a plastic tube to drain outlet and opening
drain valve knob anticlockwise,
see diagram 4
. To
assist draining, open one or more hot water taps.
●
Undo pipe coupling to expansion vessel.
●
Undo nut securing expansion vessel to boiler.
●
Lift expansion vessel out of boiler.
●
Fit replacement vessel to boiler in reverse order to
removal, ensuring that sealing washer is fitted to pipe
connection before tightening.
●
Ensure that expansion vessel charge pressure is 3
bar (45 psi) using a pressure gauge. If necessary,
increase pressure using a car or cycle tyre pump
connected to the Schrader valve.
●
Open isolating valves on flow and return connec-
tions, refill, vent and pressurise boiler.
●
Check for leaks.
To replace high limit thermostat
●
Locate high limit thermostat on left hand side of
heat exchanger below central heating flow
connection,
see diagram 9
.
●
Disconnect two electrical connectors from thermos-
tat
●
Unscrew and remove two self tapping screws
securing thermostat to heating flow pipe.
●
Remove thermostat.
●
Fit replacement thermostat in reverse order to
removal using heat sink compound supplied.
●
Reconnect two leads to thermostat, the polarity is
not important.
To replace combustion chamber insulation
●
Remove fan, flue hood and heat exchanger as
described in ‘
To replace heat exchanger
’.
●
Unscrew and remove four screws securing combus-
tion chamber cover to combustion chamber.
●
Remove combustion chamber cover.
Diagram. 9
Содержание SYLVA FF 24 E
Страница 2: ...2...
