Supplied By www.heating spares.co Tel. 0161 620 6677
16
221481C
Diagram 10.1
ACCESS for SERVICING
Casing not illustrated for clarity
COMBUSTION
CHAMBER
FRONT PANEL
SECURING
SCREW (4)
0947
SECURING ANGLE
HOOK
BOLT (2)
FLUE
HOOD
FRONT
PANEL
WING NUT (2)
WING NUT
9 Instruct User in Correct Operation of the Boiler
Hand the Instructions for Use to the user for their retention.
Instruct and demonstrate the safe and efficient operation of the
boiler, heating system and domestic hot water system.
Advise the user, that to ensure the continued efficient and safe
operation of the boiler it is recommended that it is checked and
serviced at regular intervals. The frequency of servicing will
depend upon the particular installation conditions and usage,
but in general once a year should be enough.
It is the Law that any servicing is carried out by a competent
person.
Draw attention, if applicable, to the current issue of the Gas
Safety (Installation and Use) Regulations, Section 35, which
imposes a duty of care on all persons who let out any property
containing a gas appliance.
Reminder, leave these instructions with the user.
Advise the user that the ‘Benchmark’ logbook should be
completed by the installation engineer on completion of
commissioning or servicing.
10 Servicing and Replacement of Parts
Servicing and replacement of parts must be carried out by a
competent person.
Before commencing a service or replacing parts isolate the gas
and electrical supplies.
Replacement of parts is in the reverse order to removal unless
stated otherwise.
10.1 Heating Body - Service
Remove the controls cover by pulling it forward and off.
Remove the outer casing by releasing the screw at the bottom
and unhooking at the top.
Remove the inner case by releasing screws at the top and
bottom, see diagram 4.5.
To remove the flue hood, release wing nuts and lift off securing
angle and flue hood, see diagram 10.1.
Remove the combustion chamber front panel by undoing the
wing nut at the bottom front and the four screws securing it to the
combustion chamber sides, see diagram 10.1.
Remove the two screws and washers securing the pilot burner
and shield to the main burner, see diagram 10.2.
Pull the pilot assembly forward enough to allow the main burner
to be freed from the injector. Raise the burner up at the front,
withdraw forward. Take care not to damage the insulation and
the pilot burner and electrode assemblies.
Place a sheet of paper in the combustion chamber and brush
away any deposits.
Remove the paper and debris.
10.2 Main Burner - Service
Generally follow the instruction in “Heating Body - Servicing”.
With the main burner removed the injector can be unscrewed
and replaced as necessary, using a new sealing washer.
If cleaning do not use a wire or sharp instrument on the hole.
When replacing the main burner make sure that it is pushed fully
home onto the injector and that the guides are engaged on the
injector manifold.
10.3 Pilot Burner and Injector
Generally follow the instruction in “Heating Body - Servicing”.
With the main case and controls cover etc., removed as above,
pull off ignition lead from the electrode.
Unscrew the tubing nut at the base of the pilot burner, releasing
the pilot pipe. Remove the pilot injector by unscrewing from the
pilot burner, see diagram 10.1.
Release the wing nuts securing the flue hood, see diagram
10.1.
Remove the combustion chamber front panel as above.
Remove the two screws and washers securing the pilot burner
and pilot shield to the main burner, see diagram 10.2.
Remove the pilot shield complete with electrode.
Unscrew the thermocouple nut.
The pilot burner can be lifted away.
Take care not to damage the electrode.
When replacing make sure that the spark gap is as shown in
diagram 10.3.
10.4 Thermocouple
Generally follow the instructions in “Heating Body - Servicing”.
Release, but do not remove, the two screws securing the front
and rear gland plates. Pull the front gland plate forward, see
diagram 10.4. Disconnect the thermocouple at the gas valve
and remove.
Use the old thermocouple as a pattern when fitting the new one.
Do not tighten the nut at the gas valve more than a quarter turn
beyond finger tight.
Check the electrode spark gap, see diagram 10.3.
10.5 Electrode
Generally follow the information under Section 10.3.
Unscrew the electrode from the pilot shield.
When refitting check that the gap is as in diagram 10.3.