Viessmann VITOPEND 200 Installation And Service Instructions Manual page 105

Control functions
External demand
The "External demand" function is
connected via the external extension
input "aVD".
In coding address "34" you can select
the influence the signal "External
demand" should have on the con-
nected circulation pumps.
Venting program
During the venting program, the circu-
lation pump will be alternately
switched ON and OFF for 30 seconds
respectively over a period of
20 minutes.
For a certain period, the diverter valve
is alternately set towards heating
mode and DHW heating.
Filling program
In the delivered condition, the diverter
valve is set in its centre position,
enabling the system to be filled com-
pletely. After starting the control unit,
the diverter valve no longer goes into
its centre position.
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 centre posi-
tion via coding address "2F:2" and the
pump will be started.
(cont.)
In coding address "9b", you can select
the minimum set boiler water tem-
perature in case of external demand.
The burner is switched OFF during
the venting program.
The venting program is activated via
coding address "2F:1". The program
is automatically disabled after
20 minutes, and the coding address is
set to "0".
Afterwards, the diverter valve can be
moved via coding address "2F:2" into
its centre position. If, in this position,
the control unit is switched OFF, then
the system can be filled completely.
The burner shuts down if this function
is enabled via coding address "2F".
The program is automatically disabled
after 20 minutes, and the coding
address is set to "0".
Function description
105