Viessmann Vitodens 333-F Service Instructions Manual page 9

Further details regarding the individual steps
3. Fill the heating system via the boil-
er fill & drain valve A in the heat-
ing return (at the connection set or
on site). (minimum system pres-
sure > 1.0 bar).
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 cen-
tral position, and the system will be
completely filled.
Commissioning, inspection, maintenance
(cont.)
4. If the control unit had already been
switched ON before filling began:
Switch ON the control unit and acti-
vate the fill program via coding
address "2F:2".
Note
To call up coding level 1 and for
setting the coding address, see
page 46.
For function and details of the fill
program, see page 109.
Whilst the fill program is running,
the display shows "bF",
Vitotronic 100, or "Befüllung"
(filling), Vitotronic 200.
5. Close boiler fill & drain valveA.
6. Set code "2F:0".
9