Viessmann VITODENS 111-W Installation And Service Instructions Manual page 53

Converting from LPG to natural gas
r r
Checking the CO
See "Commissioning, inspection and
maintenance".
r
content
2
Gas type conversion
(cont.)
2. Turn both rotary selectors "tw" and
"tr" simultaneously to their respec-
tive central positions.
"SERV" appears on the display.
3. Turn rotary selector "tr" within 2 s
fully anticlockwise.
The display shows "A" and the set
value flashes.
4. Adjust 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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