Glow-worm hxi and Gas Valve - Manual (Page 31)

31 0020008153-05
Diagram 11.1
12952
CONDENSE
TRAP
GAS SERVICE
COCK
GAS
SUPPLY PIPE IN
GAS PIPE BRACKET
SECURING SCREW SEALING
GROMMET
UNION NUT
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 British Gas.
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 and section 11.6.
IMPORTANT NOTE: Products of combustion will be discharged
when the cap is removed. It is important to replace the cap
immediately.
Testing Flue Gases: If any doubt exists that the flue products
are not exhausting correctly, investigate by use of a gas
analyser (FGA).
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
11.1.
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 and 11.3.
For access inside the appliance a Torx T20 drive is required or
alternatively a flat blade screwdriver can be used.
To remove chassis front, refer to section 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.
11.2 Spark Electrode
Disconnect the ignition lead and earth lead from the ignitor unit
and two securing screws at the spark electrode. Withdraw the
spark electrode carefully from the combustion chamber, see
diagram 11.2.
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.
SECURING
SCREW
2 OFF
SPARK GAP
Diagram 11.2
HEAT
EXCHANGER
GASKET
SPARK
ELECTRODE
3.5 to 4.5mm
EARTH
LEAD
11410
11 Servicing