Viessmann Vitodens 100-W Installation And Service Instructions Manual page 50

Gas type conversion
Changing from LPG to natural gas
5. Refit the burner with a new gasket
E and tighten the union nuts.
Changing the gas type at the control unit
r r
50
1. Turn on the ON/OFF switch.
2. Turn both rotary selectors "à" and
r
3. Turn rotary selector "tr" fully anti-
4. Change the control unit to natural
(cont.)
!
Please note
Tighten the union nuts suffi-
ciently to ensure the compo-
nents do not suffer damage
and will function correctly.
"tr" simultaneously into their
respective central positions.
"SERV" appears on the display.
clockwise within 2 s.
The display shows "A" and the
set value flashes.
gas or LPG by turning rotary selec-
tor "à".
The display shows:
■ "0" for operation with natural gas
or
■ "1" for operation with LPG