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InstallationIndications, functions and optionsMessages Commissioning Operation and function
System 21: Solar system with east-/west collectors and return preheating
The controller compares the temperatures at the collector sensors S1 and S5 to
the store temperature at sensor S2. If one of the measured temperature difference
is higher than the adusted switch-on temperature difference, the corresponding
pump (R1 and/or R2) will be switched on, thus loading the store until either the
switch-off temperature difference or the store maximum 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).
R2R1
S5
S3
S2
S1
R3
S4
Te mp. Sensor
Pt1000
L
R3
R2
R1
GND
S1
S2
S3
S4
S5
VBus
PWM 1
PWM 2
N
R4
V40
VBus
GND
L'
VFS
RPS
Sensors
S1 Temperature collector 1 1 / GND
S2 Temperature store base 2 / GND
S3 Temperature store
return preheating
3 / GND
S4 Temperature heating
return
4 / GND
S5 Temperature collector 2 5 / GND
Relay
R1 Solar pump collector 1 R1 / N / PE
R2 Solar pump collector 2 R2 / N / PE
R3 Valve return preheating R3 / N / PE
R4 Free R4 / N / PE
Flow direction when
normally open
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