Viessmann VITODENS 100-W Installation And Service Instructions Manual page 53

Converting from LPG to natural gas
Converting the gas type at the control unit
r r
Checking the CO
See page 26.
r
content
2
Gas type conversion
(cont.)
1. Turn ON/OFF switch ON.
2. Simultaneously turn rotary selectors
"tw" and "tr" to their central posi-
tions.
"SERV" appears on the display.
3. Turn rotary selector "tr" fully anti-
clockwise within 2 s.
"A" and the set value flash on the
display.
4. Adjust the control unit to natural gas
or LPG by turning the 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.
53