Technical information

Installation and servicing instructions strictly reserved
for qualified gas installers
37
Advise the user of the precautions necessary to
prevent damage to the system, boiler and the
building, in the event of the heating system being
out of use during frost or freezing conditions.
Advise the user that the permanent mains electrical
supply SHOULD NOT be switched off, as the built
in frost protection and pump saver program would
not be operable.
Reminder, leave these instructions with the
user.
SERVICING
IMPORTANT NOTES:
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 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.
When replacing a part on this appliance, use only
spare parts that you can be assured conform to
the safety and performance specification that
we require. Do not use reconditioned or copy
parts that have not been clearly authorised by
Saunier Duval.
11.1 General
Measurement of the products of combustion
can be achieved by connection of a probe to the
combustion analyser test point on the flue elbow,
see diagram 11.6. Refer to section 11.6 and table
2 in section 1.
IMPORTANT NOTE: Products of combustion
will be discharged when the cap is removed. It is
important to replace the cap immediately.
Before commencing with a service or replacement
of parts the boiler should be isolated from the
electrical supply and the gas supply should be
turned off at the gas service cock, see diagram
11.2.
For access inside the appliance a Torx T20 drive
is required or alternatively a flat blade screwdriver
can be used.
All routine servicing requirements can be achieved
by the removal of the front panel, inner panel and
chassis front only. Remove the two screws on the
underside of the front panel and lift off. Undo the
two screws on the front of inner panel and lift off,
see diagram 10.1. To remove chassis front, refer
to diagram 11.3.
Unless stated otherwise any part removed during
servicing should be replaced in the reverse order
to removal.
Servicing should always include the removal of any
debris from the condensate pipe and siphon.
After completing any servicing of gas carrying
components, ALWAYS test for gas soundness and
carry out a functional test of the controls.
Testing Flue Gases: If any doubt exists that
the flue products are not exhausting correctly,
investigate by use of a gas analyser (FGA).
11.2 Spark Electrode
Disconnect the ignition lead and earth lead from
the igniter unit and remove the two securing
screws at the spark electrode. Withdraw the spark
electrode carefully from the combustion chamber,
see diagram 11.1.
Inspect the tips for damage.
Clean away any debris and check the spark gap
is 3.5mm to 4.5mm.
Check the electrode gasket for signs of damage
and replace if necessary.