Form
483S
Rev
Jan
09
Page 50 of 53
provides the earth path for the ignition spark. The two electrodes are identical, therefore either lead (grey HT or
green/yellow - earth) may be connected to either electrode.
9.2.1
Disconnect the grey HT ignition/flame sensor lead and the green/yellow earth lead from the electrodes by gently
pulling the connectors, using pliers.
9.2.2
Unscrew the M6 x 16 setscrew securing the Electrode Assembly to the Control Box end panel and
remove the Electrode Assembly.
9.2.3
Unscrew the M3 setscrews securing the Electrodes to the Carrier and withdrawn the Electrodes.
9.2.4
After assembling replacement Electrodes to the Carrier, check that the spark gap is 3.5mm before inserting the
Electrode Assembly into the Control Box and securing to the Control Box end panel with the M6 x 16
setscrews.
9.3
Ignition Control (Honeywell S4565R1006)
9.3.1
Unscrew the two screws securing the cable clamp to the ignition control and remove the cable clamp.
9.3.2
Disconnect the 12 way Molex electrical connector and the grey HT ignition spark/flame sensor lead from the
Ignition Control.
9.3.3
Unscrew the M3 screw securing the Ignition Control to the Control Valve and lift out the Ignition Control.
9.4
Air Proving Switch
9.4.1
Remove the Air Tube Assembly from the Air Proving Switch pressure connection marked 'H' and from the Test
Nipple located in the centre of the Air Inlet Baffle Plate.
9.4.2
Unscrew the two No. 8 x 12 self tapping screws securing the Air Proving Switch to the floor of the Control box
and lift out with the electrical leads attached.
9.4.3
Disconnect the three electrical leads from the Air Proving Switch by gently pulling the connectors, using pliers.
9.4.4
Remove the restrictor from the Air Switch Pressure connection marked L.
9.4.5
When installing a replacement Air Pressure Switch, take care to connect the electrical leads in accordance with
the wiring diagram shown in Section 5.3.3 - Fig. 13 and replace the restrictor on the pressure connection
marked L. The appliance will not function unless this restrictor is in place.
9.5
Burner
Assembly
9.5.1
To replace the Burner, unscrew the two M4 x 25 setscrews from the Burner Bracket and remove the
Burner Clamp. Unscrew the Burner from the Injector Fitting and lift out of the Control Box.
9.6
Injector
9.6.1
Remove the Burner as described at 7.5 above. Unscrew the Injector from the Injector Fitting, using a
spanner, whilst retaining the Injector Fitting with a second spanner.
9.7
Pre-Injector
9.7.1
For models SRU/SRL-30,35,40,45, appliance category 2E+ only, there is a Pre-injector fitted into the Injector
Fitting. In the unlikely event that it should be necessary to replace this Pre-injector, first unscrew the Injector
Fitting from the straight flange attached to the Control Valve outlet port, and unscrew the pre-injector from the
Injector Fitting using a spanner, whilst retaining the Injector Fitting with a second spanner or by holding in a
vice.
Содержание CBU09
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