Som 9s – STIEBEL ELTRON SOM 9s User Manual
Page 59
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us.ind
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SOM 9s
The controller compares the temperatures at the collector
sensors S1 and S5 to the temperatures at S2 and S3. If one
of the measured temperature differences is higher than the
adjusted switch-on temperature differences, the correspon-
ding pump (R1, R2) or both pumps will be activated and the
corresponding tank zone will be loaded up to the adjusted
maximum temperature via the valve (R3). The upper tank
zone is be loaded with priority. Heat exchange from tank 1
to tank 2 (R4) is possible with another temperature diffe-
rential function (S3-heat source/S4-heat sink).
Adjustment channels
Channel
Sub channel 1
Sub channel 2 Factory
setting
Change to
Description
Page
ARR
1
24
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
Sensor/Ter-
minal
Designation
Description
S1
TCOL1
Temperature collector 1
S2
TSTB
Temperature tank bottom
S3
TSTT
Temperature tank top
S4
TST2B
Temperature tank 2 bottom
S5
TCOL2
Temperature collector 2
VFS
Optional sensor for measurement
purposes or options
RPS
V40
Relay
Description
R1
Solar pump collector 1
R2
Solar pump collector 2
R3
3-port valve tank 1 / 2
R4
Heat exchange pump
System 24
Solar system with east-/west collectors, vertical tank loading and heat exchange
R4
R3
R2
R1
S5
S4
S3
S2
S1
Temp. Sensor
Pt1000
L
R3
R2
R1
GND
S1
S2
S3
S4
S5
VBus
PW
M
1
PW
M
2
N
R4
V4
0
L'
VFS
RPS
out
in
Note: 3-port valve normally open - tank bottom