19
221788B
8 Servicing
Notes: To ensure the continued efficient and safe operation of
the boiler it is recommended that it is checked and serviced as
necessary at regular intervals. The frequency of servicing will
depend upon the particular installation conditions and usage,
but in general once a year, preferably at the end of the heating
season should be enough.
It is the Law that any servicing is carried out by a competent
person.
Before servicing turn off the gas and isolate the electrical supply
to the boiler.
After completing a service always test for gas soundness and
carry out functional check on controls.
Unless stated otherwise all parts are replaced in the reverse
order to removal.
8.1 Access
Refer to diagram 6.3 and slide the controls cover forwards and
off.
Undo the wing nuts and remove the case.
When refitting the case check the condition of the case seal, if
it needs replacing refer to Section 10.12.
8.2 Main Burner
Remove the flueway access door by removing the screws, see
diagram 8.1.
Remove the combustion chamber front, see diagram 8.1.
Disconnect the pilot pipe union connector and ignition lead, see
diagram 8.2.
Separate the pilot assembly from the main burner, by removing
the pilot shield securing nut, shakeproof washer and move to
the right. Remove the burner securing nut and wing nut from the
burner support bracket, remove the burner support bracket, see
diagram 8.3.
To remove the main burner from the main injector at the rear,
raise the burner up and forwards, easing the pilot pipe to the
side, to clear, take care not to damage the combustion chamber
insulation or the pilot burner assembly.
Use a vacuum cleaner or suitable stiff brush to clean the burner
thoroughly, making sure that all the burner ports are clear and
unobstructed.
Do not use a brush with metallic bristles.
Diagram 8.1
3812
FLUEWAY
ACCESS
DOOR
SECURING
SCREW (2)
SECURING
SCREW (4)
COMBUSTION
CHAMBER
FRONT
Diagram 8.2
3813
SECURING
NUT
PILOT
INJECTOR
PILOT
UNION
CONNECTOR
PILOT
BURNER
SPARK
ELECTRODE
THERMOCOUPLE
SPRING
CLIP
PILOT
SHIELD
IGNITION
LEAD
3814
BURNER
SUPPORT
BRACKET
WING NUT
BURNER
SECURING
NUT
Diagram 8.3
