2.4 System: Standard solar system with 1 store
The controller calculates the temperature difference between collector sensor S1
and store sensor S2. If the difference is larger than or identical to the adjusted
switch-on temperature difference (DT O), the solar pump will be activated by the
relay, and the store will be loaded until the switch-off temperature difference (DT F)
or the maximum store temperature (S MX) is reached.
Sensors S3 and S4 can optionally be connected for measurement purposes. S3 can
optionally be used as the reference sensor for the store emergency shutdown op-
tion (OSEM).
If heat quantity measurement (OHQM) is activated, S4 is to be used as the return
sensor.
9
10
VBus
Netz
Mains
3
322
S1
S2
S4 / TR
R1
S3
S1
S3
S2
S4/TR
R1
Example Drainback
system
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