22
2000225013B
12 Servicing
SECURING
SCREW
2 OFF
SPARK
GAP
3.5 to 4.5
Diagram 12.2
9179
HEAT
EXCHANGER
GASKET
SPARK
ELECTRODE
Diagram 12.1
FLUE ELBOW
Diagram 12.3
BURNER
COMBUSTION
CHAMBER
FAN
GAS
CONTROL
VALVE
SEALING
RING
FRONT
INSULATION
REMEMBER, 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 Hepworth Heating Ltd.
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.
12.1 General
Refer to Table 3 Section 1 General Information. Measurement
of the products of combustion can be achieved by connection
of a probe to the combustion analyser test point, see diagram
12.1.
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 isolation valve, see
diagram 8.1.
All routine servicing requirements can be achieved by the
removal of the front panel and inner panel only. To remove
simply undo the two screws on the underside of the front panel
and lift off, see diagram 6.3. Undo the two screws on the front
of inner panel and lift off, see diagram 6.3.
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.
12.2 Spark Electrode
Disconnect the electrode lead and two securing screws.
Withdraw the spark electrode carefully from the combustion
chamber, see diagram 12.2 and 12.5.
Inspect the tips for damage.
Clean away any debris and check the spark gap is 3.5 to 4.5
mm.
Check the electrode gasket for signs of leakage and replace if
necessary.
12.3 Burner
NOTE: IF THE BURNER HAS TO BE REMOVED IT WILL
REQUIRE A NEW GASKET WHEN REFITTED.
Drop down the control panel into the service position, see
diagram 12.8.
Disconnect the gas supply at the gas service cock.
Remove the two gas pipe retaining clips, one located below gas
valve and the other one located on the underside of the boiler
chassis, see diagram 12.4.
Pull sealing grommet down gas pipe, see diagram 12.4.
COMBUSTION
ANALYSER TEST
POINT
EARTH
LEAD
