Viessmann Vitodens 100-W WB1B Installation And Service Instructions Manual page 48

Gas type conversion
Converting from LPG to natural gas
4. Remove gas restrictor D from gas
train.
5. Fit gas train A with new gaskets
E and F.
Fixing screw torque C: 3 Nm.
Union nut torque B: 22 Nm.
Converting gas type on the control unit
48
(cont.)
6. Remove or void gas type sticker on
the top of the boiler (next to the
type plate).
1. Turn ON/OFF switch ON.
2. Simultaneously turn rotary selec-
tors "tw" and "tr" to their central
position.
"SERV" appears on the display.
3. Turn rotary selector "tr" antic-
lockwise within 2 s.
"A" and the set value flash on the
display.