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Diagram 13.3
13 Servicing
13650
GAS SERVICE
ISOLATION VALVE
PRESSURE
TEST POINT
13.3 Servicing
Note:
If the Combustion & Gas rate checks did not
require adjustment then it will not be necessary to service
the Combustion Chamber, Heat Exchanger or Burner.
Complete this section, 13.4 and then proceed to 13.9.
All routine servicing requirements can be achieved by the
removal of the front and inner panels, see diagram 13.1.
Position the control box into the service position, see
diagram 13.4.
Before commencing with a service or replacement of parts.
The boiler should be isolated from the electrical and gas
supplies. Remove the base cover, diagram 12.4 to gain
access to the gas service isolation valve, see diagram 13.3.
13.4 Spark Electrode
Disconnect the spark electrode plug and earth lead. Remove
the two securing screws and withdraw the spark electrode
carefully from the combustion chamber, see diagram 13.5.
Inspect the tips for damage.
Clean away any debris and check the spark gap is 3.5 to 4.5
mm.
Check the electr
ode gasket for signs of damage and replace
if necessary.
NOTE: If the bur
ner is not to be serviced, do not perform the
following instructions 13.5, 13.6, 13.7 and 13.8 but continue
to section 13.9 to complete the servicing.
13.5 Burner
NOTE: If the functional checks did not indicate poor
combustion then it is not necessary to service this
component.
The following procedure will require that you replace the
burner door seal and nyloc nuts.
Remove the gas pipe retaining clip, see diagram 12.5.
NOTE: When replacing ensure that the sealing grommet,
situated below the gas valve is corr
ectly re-seated.
Disconnect the gas valve electrical plug at the gas valve, see
diagram 12.5.
13554
CONTROL BOX
SERVICE
POSITION
RETAINING
CORD
Diagram 13.4
EARTH LEAD
SECURING
SCREW
(2 OFF)
SPARK
ELECTRODE
HEAT
EXCHANGER
GASKET
SPARK GAP
3.5 to 4.5mm
Diagram 13.5
13515
Diagram 13.6
13518
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