Operating instructions

External d emand
The "External de mand" function is
connected via the external extension
input "aVD".
In coding addr ess "34" you c an select
the influence the signal "External
demand" should have on the con-
nected circulation pumps.
In coding addr ess "9b" you c an select
the minimum set boiler water tem-
perature in case of external demand.
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 changeover
valve is alternately set towards heat-
ing mode and DHW heatin g.
The burner is swi tched OFF during
the venting program.
The venting program is activated via
coding "2F:1". The program is auto-
matically deactivated after 20 min,
and the coding address "2F" is set to
"0".
Filling program
In the delivered condition, the chan-
geover valve is set in its centre posi-
tion, enabling the system to be filled
completely. After starting the control
unit, the diverter valve no longer goes
into its central position.
Afterwards, the changeover valve can
be moved via coding address "2F:2"
into the centre position. In this posi-
tion, the control unit can be switched
OFF, and the the system can be filled
completely.
Filling with the control unit switched ON
If the system is to be filled with the
control unit switched ON, the change-
over will be moved to its centre posi-
tionviacode"2F:2"andthepumpwill
be started.
The burner shuts down i f this function
is enabled via coding address "2F".
The program is au tomatically deacti-
vatedafter20min,andthecoding
address "2F" is set to "0 ".
Control functions (cont.)
100
Function description
5692 619 GB