Viessmann VITOLIGNO 300-C Operating Instructions For The System User page 51

Cleaning the light barriers
Vitoligno 300-C, 80 to 101 kW
Fig. 44
Tunnel panels and casing panels must be removed.
Boiler installation and service instructions
1. Danger
Severe burns due to hot surfaces
Only perform cleaning work when the boiler
is cold.
Switch OFF the boiler.
Unscrew the top part of the sight glass and clean
the sight glass.
2. Reinstall the top part of the sight glass.
3. Proceed the same way on the opposite side of the
boiler.
(cont.)
1.
Maintenance
51