Viessmann VITODENS 100-W Installation And Service Instructions Manual page 46

Gas type conversion
Changing from LPG to natural gas
Checking the CO
See page 23.
46
content
2
(cont.)
5. Do not adjust the rotary selectors for
15 s. The set operating mode is then
saved and the control unit returns to
standard mode.
6. Switch ON/OFF switch OFF and ON
again. The selected gas type is now
enabled.