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REPLACEMENT OF PARTS
9
Before commencing any service operation, ISOLATE the mains
electrical supply and TURN OFF the gas supply at the main
service cock.
Replacement of most parts first requires the removal of the sealed
chamber front panels; refer to section 6.2.
There may be some slight water spillage; so electrical components
should be protected.
It is the law that any service work must be carried out by a
registered person.
ELECTRODES
9.1
IGNITION AND DETECTION
Refer to Figure 33
a)
Ensure supply voltage is isolated.
b)
Remove the plug (if fitted) and earth lead from the ignition
electrode.
Note:
Newer electrodes will have an integral ignition
lead.
c)
Remove the electrical supply leads.
d)
Unscrew the two screws holding the ignitor unit, remove
ignitor unit.
e)
Fit the new ignitor unit.
g)
Re-assemble in reverse order; ensure that the ignitor unit is
orientated as shown in Figure 33, and that the brown electric
supply lead is fitted to position 1 on the ignitor unit.
9.2
IGNITOR UNIT AND IGNITION LEADS
d)
Fit the new electrode, and new gasket.
e)
Check that electrode is aligned as detailed as appropriate in
Figure 26.
f)
Re-assemble in reverse order. Ensure that all joints and seals
are correctly re-fitted.
Refer to Figure 32
a)
Ensure supply voltage is isolated, and that the gas supply is
isolated.
b)
Remove the gas control valve, fan & burner assembly; refer to
section 6.2.
c)
Unscrew the two screws holding the electrode, remove
electrode, and used gasket.
33
32
SCREWS
ELECTRODE
PLUG
ELECTRODE
(DETECTION)
ELECTRODE
(IGNITION)
GASKET
IGNITION
ELECTRODE
EARTH LEAD
SCREW
SCREW
IGNITION
MODULE
IGNITION
LEAD
31
751094 ACE HE INST MANUAL:751094 ACE HE 28/9/10 09:46 Page 33
