Danger of electric shock
Danger to life due to electric current!
Do not touch plug contacts during the ignition process!
The ionization electrode must always be in contact with the flame. During
burner operation, the measured ionization flow must display the following
values:
at minimum power > 5 µA DC (switching threshold at 0.7 µA DC)
at maximum power > 10 µA DC
If these values are not reached, the ionization electrode must be replaced.
10.3.10 Changing the ionization electrode
Danger of electric shock
Danger to life due to electric current!
Before service work is started, the boiler has to be de-energised
and secured from accidentally being switched back on.
The following steps describe how to change the ionization electrode:
1. Loosen ionization line
2. Remove nuts and pull out the ionization electrode with the seal
Important
The illustration shows removal of the ionization electrode from the
EC five 125 kW - 170 kW. Removal of the ionization electrode
from the EC five 215 kW - 300 kW is carried out in the same way.
3. Insert the new ionization electrode with seal and fasten with nuts
Important
Please note: The spacing and installation position specified in the
section
Electrode spacing and installation locations
must be
heeded.
4. Reconnect the ionization line
For more information, see
Electrode spacing and installation locations, page 143
10.3.11 Electrode spacing and installation locations
The installation locations and electrode spacing for the ignition electrodes
and the ionization electrode are shown in the following diagram:
1
Ionization electrode
2
Ignition electrodes
Fig.46
Removing the ionization electrode
RA-0000241
2
Fig.47
Installation locations and spacing
RA-0000242
4
mm
1
2
8 mm
8 mm
10 Maintenance
7703301 - 01 - 16072018
143