Changing Gas Type - Saunier Duval THEMA C 23 Installation And Servicing Instructions

CHANGING GAS TYPE

Should it become necessary to change the gas type, a modification kit will be required.
This modification must only be carried out by a suitably qualified engineer.
Conversion: Natural Gas (G20) to G30/G31
Conversion: Natural Gas (G20) to G130
ROUTINE CLEANING AND INSPECTION
To ensure the continued efficient and safe opera-
tion of the boiler it is recommended that it is
checked and serviced at regular intervals. The fre-
quency of servicing will depend upon the particu-
lar installation conditions and usage, but in gen-
eral once a year should be enough.
It is the law that any servicing is carried out by a
competent person.
Service Check and Preparation.
• Operate boiler and check for any faults that
need to be put right.
• Isolate boiler from the gas and electrical supplies.
• On completion check all gas carrying parts for
soundness with leak detection fluid.
• Remove boiler casing as follows:
Upper front panel
• Hinge down control cover to gain access to con-
trol panel.
• Disengage the two 'quarter turn' fasteners by
turning the heads of the screws a quarter of a turn
towards the centre of the boiler.
• Carefully lower the panel down on its hinge until
it is horizontal.
• Turn both plastic catches to release upper front
panel.
• Remove upper front panel by pulling forward at
the bottom and lifting off.
Side panels
• From below boiler, unscrew and remove black
plastic screws securing side panels to the boiler.
• Prise out black plastic inserts and lift panel off
boiler.
Combustion chamber
• Loosen two wing nuts on combustion chamber
cover.
• Disengage retaining lugs from holes in either side
of combustion chamber and move rods away to
clear combustion chamber sides, see diagram 20.
• Unclip two toggle clips holding upper part of
combustion chamber in place.
• Holding both sides, pull chamber forward to re-
lease it from underside of heat exchanger and out
of boiler.
• Take care not to damage insulation material on
inside faces of combustion chamber.
Cleaning the burner
• Pull off lead to ignition electrode.
• Disconnect pilot pipe to pilot burner.
• Unclip pilot burner and remove.
• Remove pilot injector from pilot burner. Examine
and clean as necessary.
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Part No. XXXXX
Part No. XXXXX
Diagram 20
• Undo main gas supply nut from main burner.
• Unscrew and remove locking nut from both main
gas connection and burner pressure tapping point.
• Lift front edge of burner until tapping point and
gas supply connection are free. Remove burner
from boiler taking care to retain both fibre washers
and seal on gas supply for use on reassembly.
• Unscrew and remove two injector bar retaining
screws and separate injector bar from burner.
• Examine and clean injectors as necessary.
Note: Do not use a wire or sharp instrument on the
holes.
• Replace burner in reverse order to removal.
Heat exchanger
• After removal of burner, examine heat ex-
changer for any blockages or build up of deposits.
• Clean using soft brush or vacuum cleaner.
Important: Take care not to scratch, or otherwise
damage, painted surface of heat exchanger.
Reassembly of parts removed for servicing
• Replace all parts in reverse order to removal.
Flue system
• Inspect flue system to make sure all fittings are
secure.
• Carry out checks to make sure flue is operating
safely and efficiently.
Cold water inlet filter
• Drain down hot water circuit of boiler as follows:
• Close isolating valve on cold water inlet connec-
tion on fixing jig, see diagram 5.
• Open one or more hot water taps to drain boiler.
• Undo connecting nut from cold water inlet con-
nection to gain access to filter.
• Remove white filter from inlet connection.
Note: Connecting pipework is telescopic, it may be
necessary to slide sleeve back for easire access to
filter.
• Clean and inspect filter, replace if necessary.