Viessmann VITODENS 300-W, Service Manual

Page: 98 / 124

Filling with the control unit switched ON
If the system is to be filled with the
control unit switched ON, the diverter
valve will be moved to its central posi-
tion via code "2F:2" and the pump will
be started. The burner shuts down if this function
is enabled via coding address "2F".
The program is automatically disabled
after 20 min, and coding address "2F"
is set to "0".
Screed drying function
The screed function enables screeds
to be dried. For this, always observe
the details specified by the screed
manufacturer.
When the screed drying function is
activated, the heating circuit pump of
the mixer circuit is switched ON and
the flow temperature will be held at
the selected profile. After completion
(30 days), the mixer circuit will again
be regulated automatically via the set
parameters.
Observe EN 1264. The report to be
provided by the heating contractor
must contain the following heat-up
details:
&
Heat-up data with respective flow
temperatures
&
Max. flow temperature achieved
&
Operating condition and outside
temperature during handover
The various temperature profiles are
adjustable via coding address "F1".
The function continues after power
failure or after the control unit has
been switched OFF. "Heating and
DHW" will be started after the screed
drying function has been terminated
or if code "F1:0" is manually adjusted.
Temperature profile 1: (EN 1264-4) code "F1:1"
Control functions
(cont.)
98
Function description
5692
673
GB