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Worcester 28i Junior Specifications Page 19

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2 Spark Electrode
Remove the inner casing cover and the combustion chamber cover.
Carefully pull off the lead from the electrode. Unscrew the screw
and remove the assembly. Refer to Fig. 48.
Ensure that the electrode is at the correct height above the
burner blade.
3 Flame Sense Electrode
Remove the inner casing cover and the combustion chamber cover.
Carefully pull off the lead from the electrode assembly.
Remove the burner as described in the text following
Unscrew the screw and remove the assembly. Refer to Fig. 48.
4 Burner
Remove the inner casing cover and the combustion chamber cover.
Carefully pull-off the connections to the spark electrodes and
disconnect the flame sense electrode. Unscrew the single screw
fixing the support bracket and withdraw the burner assembly. Refer
to Fig 49.
26
Fig. 48. Flame sense electrode (rear view)
1
3
2
1. Flame sense electrode
2. Fixing screw
3. Burner blade assembly
3.5-4.5mm
5-6mm
2
Spark electrode
detail
3
4
1
Fig. 47. Spark electrode assembly.
3.5-4.5mm
Fig. 49. Burner
1. Burner
2. Spark electrode assembly
3. Flame sensor
4. Burner injector
5. Support bracket fixing screw
5
Flame sensor
detail
Neutral
19
Fig 31 - Mains Voltage External Controls
Connections
230 V Room Thermostat Connections
Ns
Ls
L
R
ST2
Ns
Ls
L
R
ST2
Remove Link
Live
Switched Live
Neutral
Live
Switched Live
Motor
230 V Programmer Connections
230 V room thermostat and
Programmer Connections
Ns
Ls
LR
Neutral
Live
Neutral
Live
Switched Live
Motor
Remove Link
spare
spare
ST2
Remove Link
Fig. 30. Optional programmer connection
1. Facia (gently pull forward to un-clip and remove)
2. Control panel (boiler outer casing in place)
3. Programmer cover (un-clip to remove)
4. Programmer location in detail
5. Programmer connections
6. Programmer connector plug
7. Programmer
1
2
3
5
6
4
7
Page view 18
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