Som 9s – STIEBEL ELTRON SOM 9s User Manual
Page 40
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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
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). Tank 1
is loaded with priority. Heat exchange from tank 1 to tank
2 (R2) is possible with another temperature differential
function (S3-heat source/S4-heat sink).
Adjustment channels
Channel
Sub channel 1
Sub channel 2 Factory
setting
Change to
Description
Page
ARR
1
16
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
SMXS2
4
Sensor tank max 2
79
LST2
ON
Loading tank 2
79
Sensor/Ter-
minal
Designation
Description
S1
TCOL
Temperature collector
S2
TST1B
Temperature tank 1 bottom
S3
TSTT
Temperature tank 1 top
S4
TST2B
Temperature tank 2 bottom
S5
Optional sensor for measurement
purposes or options
VFS
RPS
V40
Relay
Description
R1
Solar pump
R2
Heat exchange pump
R3
3-port valve tank 1 / 2
R4
optional:
Thermal disinfection
Parallel relay
Heat dump
System 16
2-tank solar system with valve logic and heat exchange control
R2
R3
R1
S4
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
Note: 3-port valve normally open
- tank 1 (S2)