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Arrangement 7: Solar system with east-/west collectors and 1 store
The controller calculates the temperature difference between collector sensors
S1 and S3 and store sensor S2. If the differences are larger than or identical to the
adjusted switch-on temperature difference (DT O), one or both solar pumps will
be activated by relay 1 and / or relay 2, and the store will be loaded until the switch-
off temperature difference (DT F) or the maximum store temperature (S MX) is
reached.
PWM 1/2
VFD
S3
S1
R1
R2
S4 / VFD / TFL
S4 / VFD / TR
Sensor S4 can optionally be used as the reference sensor for the store emergency
shutdown option (OSEM). If heat quantity measurement (OHQM) is activated, S4
and VFD are used as the flow and return sensors respectively.
VBus
9 10
S4 /
TSTT
S2
33
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