79
A
B
Fig. 72
1.
Undo 2 screws and remove fan
A
.
2.
Remove back draught safety device
B
.
3.
Check the damper and gasket of the back draught
safety device for contamination and damage.
Replace if necessary.
4.
Refit back draught safety device
B
.
5.
Refit fan
A
and secure with two screws.
Torque: 4.0 Nm.
Checking and adjusting ignition and ionisation electrode (gas condensing
module)
10
6.5
A
A
B
±0.5
4
+0.5 0
5
+3
0
+1
0
Fig. 73
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.
Commissioning, inspection, maintenance
Checking the back draught safety device
5853335
