Viessmann VITODENS 333 Service Instructions Manual page 105

Control functions
Filling program
Note
Close the gas shut-off valve when
operating the filling program.
In the delivered condition, the diverter
valve is set to its central position,
enabling the system to be filled com-
pletely. After starting the control unit,
the diverter valve no longer goes into
its central position.
Filling with the control unit switched ON
If the system is to be filled with the
control unit switched ON, the diverter
valve is moved into its central position
via coding address 2F:2, and the
pump is started. The burner shuts
down if this function is activated via
coding address 2F. The program is
automatically deactivated after
20 minutes, and the coding address is
set to 0.
Screed function
The screed drying functions enables
the drying of a freshly laid screed. For
this, always observe the instructions
issued by the screed manufacturer.
(cont.)
The diverter valve can be moved into
its central position via coding address
2F:2. The system can be filled com-
pletely, if the control unit is switched
OFF in this position.
Various temperature profiles are
available for selection.
Function description
105