Viessmann Vitodens 200-W WB2B Series, Service Instructions For Contractors

Page: 96 / 120

The duration of the heating program
changeover can be adjusted in coding
address "F2":
Heating program changeover Coding
No heating program changeover F2:0
Duration of the heating program changeover 1 to 12 hours F2:1 to
F2:12
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 ".
In coding address "32", you can select
the influence the "Ext. blocking" sig-
nal should have on the connected cir-
culation pumps.
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.
The minimum set boiler water tem-
perature in case of external demand
is selected in coding address "9b".
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. 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".
Control functions
(cont.)
96
Function description
5692
761
GB