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Function description
Control functions
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.
For a certain period, the changeover
valve is alternately set towards heat-
ing mode and DHW heating. The
burner is switched OFF during the
venting program.
Filling program
In the delivered condition, the chan-
geover valve is set to its central posi-
tion, enabling the system to be filled
completely. After starting the control
unit, the diverter valve no longer goes
into its central position.
92
(cont.)
In coding address "32", you can select
the influence the "Ext. blocking" sig-
nal should have on the connected cir-
culation pumps.
In coding address "9b", you can select
the minimum set boiler water tem-
perature in case of external demand.
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 changeover valve can
be moved via coding address "2F:2"
into its central position. If, in this posi-
tion, the control unit is switched OFF,
then the system can be filled comple-
tely.
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