Viessmann VITOLIGNO 300-C Installation And Service Instructions Manual page 26

Installation sequence
Boiler version with pellet hopper
5.
Fig. 19
3. Align the pellet hopper so that the flange and cast
casing of the rotary lock valve are flush.
4. Tighten the screws.
26
(cont.)
4.
4x
10 Nm
5. Visual inspection
Check through the opening that the pellet hopper is
correctly positioned.
Foreign bodies between the pellet hopper and the
rotary lock valve can cause bridging. Remove any
foreign bodies.
Secure the maintenance cover of the pellet hopper.
3.