36
10
6.5
A
A
B
±0.5
4
+0.5 0
5
+3
0
+1
0
Fig. 23
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 screws as tightly as necessary and ensure
that the components are undamaged and are func-
tioning correctly throughout service life.
Observe torque settings if a torque wrench is avail-
able.
Tighten the electrode fixing screws to a torque of
4.5 Nm.
Cleaning the heating surfaces
!
Please note
Scratches to the surfaces of the heat exchanger
that come into contact with hot gas can result in
corrosion damage. Brushing can cause deposits
to become lodged in the gaps between the coils.
Do not use brushes to clean the heating sur-
faces.
!
Please note
Prevent damage due to cleaning water.
Cover electronic components with suitable
watertight material.
Note
Discolouration on the heat exchanger surface is a nor-
mal sign of use. It has no bearing on the function or
service life of the heat exchanger.
The use of chemical cleaning agents is not required.
A
Fig. 24
1.
Use a vacuum cleaner to remove combustion resi-
dues from heating surface
A
of the heat
exchanger.
2.
Flush heating surface
A
with water.
3.
Check condensate drain. Clean the trap: See the
following chapter.
4.
Check the thermal insulation mat (if fitted) in the
heat exchanger for damage; replace if necessary.
Commissioning, inspection, maintenance
Checking and adjusting the ignition and ionisation electrodes
6174240
