4. Clean the burner with a vacuum cleaner.
Important
Do not use a brush as it may damage the burner.
5. Check the distance between the flame detection electrode and the
burner.
Tab.71 Distances and tolerances to be observed for the flame
detection electrode and the burner
Dis
tan
ce
SIRIUS THREE FS 50 –
SIRIUS THREE FS 70 –
SIRIUS THREE FS 90
SIRIUS THREE FS 110
L1 7.5 mm with a tolerance of +/-
1 mm
5 mm with a tolerance of +/- 1
mm
Important
Replace the flame detection electrode if it is damaged.
6. Check the distance between the ignition electrode and the burner.
Tab.72 Distances and tolerances to be observed for the ignition
electrode and the burner
Dis
tan
ce
SIRIUS THREE FS 50 – SIRIUS THREE
FS 70 – SIRIUS THREE FS 90
SIRIUS THREE
FS 110
L2 10 mm with a tolerance of +/- 1 mm
7.5 mm with a tol
erance of +/- 1
mm
Important
Replace the ignition electrode if it is damaged.
7. Check the distance between the ignition electrode and the ground
electrode.
Tab.73 Distances and tolerances to be observed for the ignition electrode and the ground electrode
Distance
SIRIUS THREE FS 50 – SIRIUS THREE FS 70 – SIRIUS THREE FS 90 –
SIRIUS THREE FS 110
L3
4 mm with a tolerance of +/- 0.5 mm
Important
Replace the ignition electrode if it is damaged.
8. Check whether the insulation on the inside surface of the burner is
damaged in any way. The surface must be clean and free of any
damage. Replace the insulation if it is damaged.
9. Remount the burner.
Fig.121 Distances and tolerances to be
observed for the flame detection
electrode and the burner
MW
-3
0
0
0
1
0
2
L1
Fig.122 Distances and tolerances to be
observed for the ignition electrode
and the burner
MW
-3
0
0
0
1
0
3
L2
Fig.123 Distances and tolerances to be
observed for the ignition electrode
and the ground electrode
MW
-3
0
0
0
2
1
6
-0
1
L3
10 Maintenance
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