SERVICING
Mini --- Installation & Servicing34
REPLACEMENT OF COMPONENTS
42 GENERAL
When replacing any component:
1 Isolate the electricity supply at the switched spur.
N.B. Turning the boiler “ON/OFF” switch does not isolate
the live supply to the boiler.
2 Turn off the gas supply.
IMPORTANT. When work is complete the inner case cover
must be correctly fitted, ensuring that a good seal is made.
THE BOILER MUST NOT BE OPERATED IF THE INNER
CASE COVER IS NOT FITTED.
If the CH and/or the DHW circuits have been emptied:
3 Open the hydraulic circuit cocks, refill / re ---pressurise
pipeworks and vent the system.
4 Test fire the boiler
5 Disconnect the filling loop.
43 SPARK AND DETECTION
ELECTRODE REPLACEMENT
1 Disconnect the electrical supply.
2 Remove outer and inner casing (refer to frame 36).
3 Open the combusti on chamber and disconnect the
electrodes leads.
4 Remove the burner. Refer to frame 37.
5 Undo the screws that hold the electrodes and remove.
6FormodelsMini C24, Mini C28, Mini S24, Mini S28,fit
new electrodes as necessary following the sequence
illustrated.
Ignition 1
st
Ignition 2
nd
Detection 3
rd
7 Check the spark gap.
4 mm (5/32”)
Ignition
Detection
Male
Female
10 mm
Burner blad
(3/8”)
Mini C24, Mini C28, Mini S24, Mini S28
4 mm (5/32”)
Ignition
Detection
Male
Female
10 mm
Burner blades
(3/8”)
10 mm
(3/8”)
Mini C32
8 Re ---assemble in reverse order.
9 Check the ignition and operation of the burner.
44 BURNER REPLACEMENT
1 Remove the burner as explained in frame 37
2 Remove the spark and detectio n electrodes.
Refer to frame 43.
3 Fit the electrodes on the new burner and check the spark
gap.
4 Re ---assemble in reverse order.
5 Check the operation of the boiler.
SERVICING
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