48
10
6.5
A
A
B
±0.5
4
+0.5 0
5
+3
0
+1
0
Fig. 32
A
Ignition electrodes
B
Ionisation electrode
1.
Check the electrodes for wear and contamination.
2.
Clean the electrodes with a small brush (not a wire
brush) or sandpaper.
3.
Check the electrode gaps. If the gaps are not as
specified or the electrodes are damaged, replace
the electrodes and gaskets and adjust them as
required. Tighten the electrode fixing screws to a
torque of 4.5 Nm.
Checking the back draught safety devices
Only for multiple connections to a flue system or multi
boiler systems with a flue gas cascade.
Back draught safety device in the mixing shaft of
the burner
A
B
Fig. 33
1.
Undo 2 screws and remove fan
A
.
2.
Remove back draught safety device
B
.
3.
Check the damper and gasket for dirt and damage.
Replace if necessary.
4.
Refit back draught safety device
B
.
Note
Observe correct installation position.
5.
Refit fan
A
and secure with 2 screws.
Torque: 4.0 Nm
Back draught safety device in the flue gas connec-
tion
A
Fig. 34
Commissioning, inspection, maintenance
Checking and adjusting the ignition and ionisation electrodes
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