Viessmann VITODENS 100-W Installation And Service Instructions Manual page 54

Gas type conversion
Converting from LPG to natural gas
r r
Checking the CO
See page 25.
54
r
content
2
(cont.)
2. Turn both rotary selectors "tw" and
"tr" simultaneously into their
respective central positions.
"SERV" appears on the display.
3. Turn rotary selector "tr" within 2 s
fully anticlockwise.
"A" and the newly selected value
flash on the display.
4. Change the control unit to natural gas
or LPG by turning rotary selector
"tw".
The display shows:
■ "0" for operation with natural gas
or
■ "1" for operation with LPG.
5. The set operating mode is saved
when the value stops flashing, and
the control unit returns to standard
mode.