System 9: Solar system with 1 store and return preheating
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, the pump (R1) will be switched on and the store
will be loaded until the switch-off temperature difference or the maximum store
temperature is reached.
With another temperature differential function (S3 heat source/S4 heat sink) re-
turn preheating (heating circuit backup) is possible via another valve (R3).
Hydraulic variant 1
Hydraulic variant 2
Sensors
S1 Temperature collector 1 / GND
S2 Temperature store
base
2 / GND
S3 Temperature store
return preheating
3 / GND
S4 Temperature heating
return
4 / GND
S5 Free 5 / GND
S6 Free S6
Relay
R1 Solar pump R1 / N / PE
R2 Free R2 / N / PE
R3 Valve return preheating R3 / N / PE
R4 Free R4 / R4
VBus
VBus
S5/V40
S4
S3
GND
S6
S7
Sensors
Relais
S2
S1
N
R3
R2
R1
L
R4
PWM A
0-10 V
PWM B
0-10 V
R4
N N N N
R3 R2 R1 L
1234
56789
10 11
2
332
2 2 3
R3
R1
S4
S3
S2
S1
Netz
Mains
Flow direction
when normally open
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