English
7
S1
A
S2
S3
Hydraulic diagrams
Solar thermal system - program 0
= factory settings
The solar pump
A
runs when S1 has a temperature of
diff
higher than S2 and S2 has not
exceeded the threshold
max
.
In addition, the pump’s protective function takes effect: During a standstill, steam can oc-
cur in the system. When automatically switched on again, the pump does not have the re-
quired pressure in the steam phase to lift the fluid level to the collector’s supply line (highest
point in the system). This represents a considerable load on the pump. The collector’s excess
temperature shut-down function can be used to block the pump whenever a certain tempera-
ture has been reached at the collector’s sensor until a second threshold, which can also be
set, is fallen short of again. The settings ex works are 130°C for the blockage and 110°C for
the release. The settings can be changed in the menu
MEN
, sub-menu
SYS PF
/
CET
(collec-
tor excess temperature).
Program 1:
With this program, the solar thermal system has an additional storage limit
max2
via sen-
sor
S3
. There is no guarantee that the actual storage temperature will lead to a cut-off in
time, especially if the reference sensor S2 is installed at the return outlet for the heat ex-
changer.
Program 2:
As program 0, however with additional 10 V burner requirement via
S3
at control output.
A = S1 > (S2 + diff) & S2 < max
Control output COP:
10 V = S3 < min2 (burner on)
0 V = S3 > max2 (burner off)
Subsequently, an auxiliary relay can be connected to the control output HIREL-STAG, which
forwards the burner requirement in potential-free format. The active control output is indicat-
ed by the flashing burner symbol in the display.
S1
S2
max
diff
Required settings :
max
…
limit TK
S2
max2
… see program
1 or 2
min2
… see program
2
diff
… coll.
S1
– TK
S2
Additional required settings:
max2
… COP off (0V)
S3
(ex works = 65°C)
min2
… COP on (10V)
S3
(ex works = 40°C)
S3 for program 1 and 2
