Viessmann VITODENS 200-W Service Instructions Manual page 99

Control functions
The duration of the heating program
changeover can be adjusted in coding
address "F2":
Heating program changeover
No heating program changeover
Duration of the heating program changeover 1 to 12 hours
The operating mode changeover
remains active for as long as the con-
tact remains closed, but at least as
long as the duration selected in cod-
ing address "F2".
External blocking
The "External blocking" function is
connected via the external extension
input "aVD".
External demand
The "External demand" function is
connected via the external extension
input "aVD".
In coding address "34" you can select
the influence the "Ext. demand" signal
should have on the connected circula-
tion pumps.
Venting program
During the venting program, the circu-
lation pump will be alternately
switched ON and OFF for 30 s respec-
tively over a period of 20 min.
The burner is switched OFF during
the venting program.
(cont.)
In coding address "32", you can select
the influence the "Ext. blocking" sig-
nal should have on the connected cir-
culation pumps.
The minimum set boiler water tem-
perature in case of external demand
is selected in coding address "9b".
The venting program is activated via
code "2F:1". The program is automati-
cally disabled after 20 min, and cod-
ing address "2F" is set to "0".
Function description
Coding
F2:0
F2:1 to
F2:12
99