Saunier Duval SYLVA FF 24 E, Инструкции по обслуживанию

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8
REPLACEMENT OF PARTS
●
Withdraw gas valve assembly.
●
Using old gas valve as a guide, transfer gas pipes
from old gas valve to replacement gas valve.
●
Fit replacement gas valve into boiler.
●
Reconnect gas pipes in reverse order to removal.
●
Refit electrical connections in reverse order to
removal, the polarity of the wires to the modulating
coil is not important.
To replace modulating coil
●
Ensure that gas supply to boiler is turned off at gas
cock.
●
Disconnect electrical connections to gas valve
modulating coil, see diagram 8.
●
Undo two screws securing modulating coil to gas
valve and remove coil.
●
Fit replacement coil in reverse order to removal.
●
Refit electrical connections in reverse order to
removal, the polarity of the wires to the modulating
coil is not important.
To replace central heating safety valve
If safety valve seating is damaged, it will be necessary
to replace safety valve as a complete unit, repair is
not possible.
●
Drain down heating circuit of boiler only as
described previously.
Note: It is not necessary to drain down entire heating
system to carry out this work.
●
Disconnect safety valve discharge pipe from safety
valve.
●
Remove safety valve from boiler pipework,
see
diagram 7.
●
Fit replacement safety valve in reverse order to
removal.
●
Open isolating valves on flow and return connec-
tions, refill, vent and pressurise boiler.
●
Check for leaks.
To replace temperature/pressure relief valve (T&P
valve)
To replace T&P valve, it is necessary to drain upper
section only of 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.
●
Locate T&P valve on upper part of storage
cylinder.
●
Disconnect T&P valve discharge pipe.
●
Unscrew and remove T&P relief valve.
●
Fit replacement T&P valve in reverse order to
removal using a Water Research Centre approved
sealant suitable for potable water.
●
Open isolating valve ( c ) on cold water inlet
connection on fixing jig, see diagram 3 .
●
Refill storage tank and vent cylinder.
●
Check for leaks.
To replace anode
To replace anode, it is necessary to drain upper sec-
tion only of 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.
●
Remove earth lead from connection at top of
anode.
●
Unscrew and remove anode from storage
cylinder.
●
Fit replacement anode in reverse order to
removal.
●
Open isolating valve (
c
) on cold water inlet pipe,
see diagram 3
.
●
Refill storage tank and vent cylinder.
●
Check for leaks.
To replace heat exchanger
●
Drain down heating circuit of boiler only as
described previously.
Note:
It is not necessary to drain down entire
heating system to carry out this work.
●
Remove fan as described in ‘ Routine Cleaning
and Inspection ’.
●
Undo two nuts securing heating flow and return
pipes to sealed chamber bulkhead fittings, see
diagram 9.
●
Undo nuts on heating flow and return connec-
tions on heat exchanger.
●
Undo nuts securing sealed chamber bulkhead
fittings to sealed chamber and remove pipes and
fittings from boiler.
Note:
Keep washers for use on reassembly.
●
Remove spring clip securing flue hood to heat
exchanger pipe and withdraw flue hood forwards
and out of boiler.
●
Disconnect electrical connectors from high limit
thermostat.
●
Lift heat exchanger up and out of combustion
chamber and remove from boiler.
●
Fit replacement heat exchanger in reverse order
to removal.
●
Reconnect electrical connections to high limit
thermostat, the polarity is not important.
●
Reconnect heating connections using new
washers supplied.
●
Replace flue hood and fan in reverse order to
removal.
●
Open isolating valves on flow and return connec-
tions, refill, vent and pressurise boiler.
●
Check for leaks.
To replace expansion valve
●
Close isolating valve (
c
) on cold water inlet pipe,
see diagram 3
.
●
Locate expansion valve at base of
●
Disconnect pipework to expansion valve and
remove valve from boiler.
●
Fit replacement expansion valve in reverse order
to removal.
●
Open isolating valves on flow and return connec-
tions, refill, vent and pressurise boiler.
●
Check for leaks.