Viessmann VITODENS 100-W Installation And Service Instructions Manual page 45

Changing from LPG to natural gas
5. Refit burner with new gasket E and
tighten the union nuts.
Changing the gas type at the control unit
r r
1. Turn ON/OFF switch ON.
2. Turn both rotary selectors "à" and
r
3. Turn rotary selector "tr" fully anti-
4. Turn the rotary selector "à" to con-
Gas type conversion
(cont.)
!
Please note
Tighten union nuts far enough
to prevent the components
being damaged and to ensure
they function correctly.
"tr" simultaneously to their centre
position.
"SERV" appears on the display.
clockwise within 2 s.
The display shows "A" and the
selected value flashes.
vert the control unit to natural gas or
LPG.
The display shows:
■ "0" for operation with natural gas
or
■ "1" for operation with LPG.
45