12
Control output
A1
O1
O1
230 V AC
Analogue Type A
ANALOG Typ A
0
2
4
6
8
10
0
50
100
150
nSoll in %
U
in
V
ol
t
bei nmin = 30 %
PWM Type B
PWM Typ B
0
20
40
60
80
100
0
25
50
75
100
nSoll in %
PW
M
in
%
bei nmin = 30 %
A1 no RPM control, only switched operation on/off. Minimum switch-on time 5
sec.
7.1.5 Drain-back function
If this function is active when the solar circuit pump is switched off, then the
medium drains back into a collection container. This prevents the system freezing
or overheating. When the pump is switched back on, it is operated at maximum
capacity for the preset fill time before then switching to capacity control.
Recooling is not possible at this time (menu items 3 and 4 are not shown)
"Basic Setup" menu
Display
Meaning
Value range
Factory set-
ting
Line Value
0
2
Collector protection function
0 = Off
1 = On
2 = Drain back
0 = Off
1
120 °C
Collector protection temperature
80 – 150 °C
120 °C
2
180
Fill time for drain-back function
15 – 360 sec
180 sec
Settings and changes in
this menu must only be
carried out by a specialist techni-
cian. Incorrect settings can
damage or adversely affect the
function of the solar power
system.
