Viessmann VITODENS 222-F Installation And Service Instructions Manual page 24

Commissioning, inspection, maintenance
Further details regarding the individual steps
Note
If the control unit has not been
switched ON prior to filling the sys-
tem, then the servomotor of the
diverter valve will still be in its central
position, and the system will be com-
pletely filled.
Note
Lever on valve B must be in the
"l.h." position.
4. If the control unit had already been
switched ON before filling began:
Switch control unit ON and activate
filling program (see next steps).
Note
For function and details of the fill pro-
gram, see page 138.
24
(cont.)
5. Close boiler drain & fill valve A.
Activating filling function with
weather-compensated control units:
1. Press OK and simultaneously for
approx. 4 s.
2. "Service functions"
3. "Filling"
4. Ending filling function:
Press OK or .
Activating filling function with con-
stant temperature control units:
1. Press OK and simultaneously for
approx. 4 s.
2. Select
"4" and confirm with OK.
The display shows "bF on" when the
filling function is activated.
3. Ending filling function:
Press .