Som 9s – STIEBEL ELTRON SOM 9s User Manual
Page 15
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SOM 9s
R3
R1
S3
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
The controller compares the temperature at sensor S1 to
the temperatures at sensors S2 and S3. If the measured
temperature differences are higher than the adjusted switch-
on temperature differences, the pump (R1) will be activated
and the corresponding tank zone will be loaded up to the
adjusted maximum temperature via the valve (R3). The prio-
rity logic effects prior loading of the upper zone of the tank.
Sensor/Ter-
minal
Designation
Description
S1
TCOL
Temperature collector
S2
TSTB
Temperature tank bottom
S3
TSTT
Temperature tank top
S4
Optional sensor for measurement
purposes or options
S5
VFS
RPS
V40
Relay
Description
R1
Solar pump
R2/R4
optional:
Thermal disinfection
Parallel relay
Heat dump
R3
3-port valve tank top/bottom
Adjustment channels
Channel
Sub channel 1
Sub channel 2 Factory
setting
Change to
Description
Page
ARR
1
4
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
DT2S
20 °R
Set temperature difference 2
78
RIS2
4 °R
Rise 2
78
S2MAX
140 °F
Tank maximum limitation 2
78
System 4
Solar system with 1 tank and 3-port valve for vertical tank loading
Note: 3-port valve normally open - tank bottom