Viessmann VITODENS 100-W Installation And Service Instructions Manual page 21

Further details regarding the individual steps
r r
B C A
close
open
Commissioning, inspection, maintenance
(cont.)
3. Turn rotary selector "rt" fully anti-
clockwise for less than 2 s and then
return it clockwise into its control
range.
"SERV", "r" and "w" will appear
on the display. Filling has been acti-
vated.
This function will end automatically
after 20 min or after the ON/OFF
switch has been turned off.
4. Open shut-off valves A and (if fitted)
B.
5. Connect fill hose to valve C and
open valve C.
6. Fill heating system (Minimum system
pressure > 0.8 bar).
7. Close valve C.
21