Viessmann VITODENS 100-W Installation And Service Instructions Manual page 49

Converting from LPG to natural gas
Changing the gas type at the control unit
r r
Checking the CO
See page.
r
content
2
Gas type conversion
(cont.)
1. Turn on the ON/OFF switch.
2. Turn both rotary selectors "tw" and
"tr" simultaneously into their
respective central positions.
The display shows "SERV".
3. Turn rotary selector "tr" within 2 s
fully anticlockwise.
The set value and "A" 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.
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