Viessmann Vitoligno 300-C Installation And Service Instructions Manual page 68

Commissioning, inspection, maintenance
Cleaning the flue gas fan, Lambda probe and...
A
B
E D
6x
Fig. 47
1. Spray the flanged nuts of flue gas fan
remover, leave to work, then release the screws.
Pull out motor B with the impeller.
Note
■ Do not dismantle the impeller.
The cables are not long enough to set the motor
■
down on the floor.
Note
The flue gas fan requires cleaning in the following
cases:
■ Vibration noises occur due to impeller imbalance
(deposits on the impeller vanes).
The boiler output is reduced.
■
2. Clean impeller with a spatula and vacuum cleaner.
3. Check impeller for visible damage and secure
seating.
4. Clean Lambda probe
carefully and inspect for damage. Replace the
Lambda probe if required.
Danger
There is a risk of fire and burns due to hot
components and cinders.
■ Switch OFF the boiler and let it cool down.
■ Carry out maintenance and cleaning work
only on central heating boilers that have
cooled down.
Allow hot component to cool down before
■
removing.
■ Wear suitable personal protective equip-
ment, in particular protective gloves.
68
F
with rust
A
C with a soft brush, tap
(cont.)
C
5. Undo the locking screw in sensor well
flue gas temperature sensor and remove sen-
sor E .
6. Wind out sensor well
D
brush.
7. Refit the sensor well and sensor in reverse order.
8. Clean condensate trap
9. Reassemble all components in reverse order.
Check that sealing surfaces are clean.
Note
Installation position of motor
shown.
Clean the threaded studs on flue gas fan
lubricate with assembly paste.
for the
D
and clean with a soft
(if installed).
F
with cables as
B
and
A