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Arrangement 6: Solar system with 2 stores and pump logic
The controller calculates the temperature difference between collector sensor S1
and store sensors S2 and S3. If the difference is larger than or identical to the corre-
sponding adjusted switch-on temperature differences (DT1O / DT2O), one or both
solar pumps will be activated by relay 1 and / or relay 2, and the corresponding store
will be loaded until the switch-off temperature difference (DT1F / DT2F) or the
maximum store temperature (S1MX / S2MX) is reached. The priority logic causes
PWM 1/2
VFD
S1
S4 / VFD / TR
R1
R2
30
VBus
9 10
S4 / VFD / TFL
S4 /
TSTT
Store 1
Store 2
S2
priority loading of the store selected in the PRIO channel, if possible. If PRIO = 0,
both stores will be loaded simultaneously.
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.
S3
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