1. Remove nuts with washers and release the the fan with seal from the
burner cover
2. Remove screws and release venturi pipe, incl. gas valve with seal
from the fan
3. Clean fan with compressed air
4. Reassemble burner in the opposite sequence
Important
Use new seals when reassembling the burner.
5. Reinstall the burner
Danger
Risk to life due to explosion, fire or escaping flue gas. Before
commissioning the boiler, the parts of the system through which
fuel and flue gas flow must be checked for leaks. If there are any
leaks in the pipelines, the seals must be replaced. If there are any
leaks due to defective components, the components in question
must be replaced.
For more information, see
10.3.8 Changing the ignition electrodes
Important
To avoid an influence of the ionization current by the ignition, the
ignition electrode must only immerse into the edge of the flame.
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 ignition electrodes:
1. Loosen ignition cable
2. Loosen nuts and pull the ignition electrode block with seal out of the
burner cover
Important
The illustration shows removal of the ignition electrodes from the
EC five 125 kW - 170 kW. Removal of the ignition electrodes from
the EC five 215 kW - 300 kW is carried out in the same way.
3. Insert the new ignition electrode block with seal and fasten with nuts
Important
Please note: The spacing and installation positions specified in the
section
Electrode spacing and installation locations
must be
heeded.
4. Reconnect the ignition cable
For more information, see
Electrode spacing and installation locations, page 143
10.3.9 Checking the ionization electrode
For measurement of the ionization current, pull plug from the gas burner
control and connect ammeter between plug and electrode. Measurement
must be carried out at full load and part load.
Fig.45
Removing the fan
RA-0000239
1
2
RA-0000240
2
10 Maintenance
142
7703301 - 01 - 16072018