Som 9s – STIEBEL ELTRON SOM 9s User Manual
Page 17
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SOM 9s
The controller compares the temperature at sensor S1 to
the temperatures at sensors S2 and S4. If the measured tem-
perature differences are higher than the adjusted switch-on
temperature differences, the pump (R1) will be activated and
the corresponding tank will be loaded up to the adjusted
maximum temperature via the valve (R3). Tank 1 is loaded
with priority.
Sensor/Ter-
minal
Designation
Description
S1
TCOL
Temperature collector
S2
TST1B
Temperature tank 1 bottom
S3
Optional sensor for measurement
purposes or options
S4
TST2B
Temperature tank 2 bottom
S5
Optional sensor for measurement
purposes or options
VFS
RPS
V40
Relay
Description
R1
Solar pump
R2/R4
optional:
Thermal disinfection
Parallel relay
Heat dump
R3
3-port valve tank 1 / 2
Adjustment channels
Channel
Sub channel 1
Sub channel 2 Factory
setting
Change to
Description
Page
ARR
1
5
System
78
LOAD1 >
Loading 1
DT1O
12 °R
Switch-on temperature difference 1
78
DT1F
8 °R
Switch-off temperature difference 1
78
DT1S
20 °R
Set temperature difference 1
78
RIS1
4 °R
Rise 1
78
S1MAX
140 °F
Tank maximum limitation 1
78
SMXS1
2
Sensor tank max 1
79
LOAD2 >
Loading 2
DT2O
12 °R
Switch-on temperature difference 2
78
DT2F
8 °R
Switch-off temperature difference 2
78
System 5
2-tank system with valve logic, 1 pump, 3 sensors and 3-port valve
R3
R1
S4
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
Note: 3-port valve normally open - tank 1 (S2)