STIEBEL ELTRON SOM 9s - Manual (Page 9)

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SOM 9s
2.6 System layouts
System 1
Standard solar system with 1 tank
The controller calculates the temperature difference bet-
ween collector sensor S1 and tank sensor S2. If the diffe-
rence is larger than or identical to the adjusted switch-on
Relay Description
R1 Solar pump
R2 optional:
Thermal disinfection
Booster pump
Parallel relay
Heat dump
R3
R4
Adjustment channels
Channel Sub channel 1 Sub channel 2 Factory
setting
Change to Description Page
ARR 1 System 78
LOAD > Loading
DT O 12 °R Switch-on temperature difference 78
DT F 8 °R Switch-off temperature difference 78
DT S 20 °R Set temperature difference 78
RIS 4 °R Rise 78
S MAX 140 °F Tank maximum limitation 78
SMAXS 2 Sensor tank max 79
COL > Collector
CEM 270 °F Collector emergency temperature 80
OCCO** OFF Option collector cooling 80
CMAX 230 °F Maximum collector temperature 80
OCMI OFF Option collector minimum limitation 80
CMIN 50 °F Minimum collector temperature 80
Sensor/Ter-
minal Designation Description
S1 TCOL Temperature collector
S2 TSTB Temperature tank bottom
S3 Optional sensor for measurement
purposes or options
S4
S5
VFS
RPS
V40
temperature difference, the pump (R1) will be switched on
and the tank will be loaded until the switch-off temperature
difference or the maximum tank temperature is reached.
R1
S2
S1
Temp. Sensor
Pt1000
L R3 R2 R1
GND
S1 S2 S3 S4 S5 VBus PWM
1
PWM
2
N
R4 V40 L'
VFS
RPS
out in