Viessmann VITOLIGNO 300-C Installation And Service Instructions Manual page 58

Installation sequence
Fitting the casing panels
Note
Secure panels from above with 4 self-tapping screws
3.9 x 25 each.
Affixing the type plate
Fig. 50
Affix the type plate to the left or right casing panel.
58
(cont.)
Note
Preferably affix it to the more accessible side of the
boiler.