Viessmann VITODENS 200-W Service Instructions Manual page 99

Control functions
External blocking
The "External blocking" function is con-
nected via external extension input
"aVD".
External demand
The "External demand" function is con-
nected via external extension input
"aVD".
In coding address "34" you can select the
influence the "Ext. demand" signal
should have on the connected circulation
pumps.
Venting program
During the venting program, the circula-
tion pump will be alternately switched
ON and OFF for 30 s respectively over a
period of 20 min.
The burner is switched OFF during the
venting program.
Filling with the control unit switched ON
If the system is to be filled with the control
unit switched ON, code "2F:2" starts the
pump.
Screed drying function
The screed function enables screeds to
be dried. For this, always observe the
details specified by the screed manufac-
turer.
(cont.)
In coding address "32", you can select
the influence the "Ext. blocking" signal
should have on the connected circulation
pumps.
The minimum set boiler water tempera-
ture in case of external demand is selec-
ted in coding address "9b".
The venting program is activated via
code "2F:1". The program is automati-
cally disabled after 20 min, and coding
address "2F" is set to "0".
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".
Function description
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