Som 9s – STIEBEL ELTRON SOM 9s User Manual
Page 49
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SOM 9s
The controller compares the temperatures at the collector
sensors S1 and S5 to the tank temperature at sensor S2. If
one of the measured temperature differences is higher than
the adjusted switch-on temperature differences, the corre-
sponding pump (R1, R2) or both pumps will be activated and
the tank will be loaded.
With another temperature differential function (S3-heat
source/S4-heat sink) heating circuit return preheating (he-
ating circuit backup) is possible with another valve (R3).
Domestic hot water backup heating (R4) can be carried out
with a thermostat function (S3).
Adjustment channels
Channel
Sub channel 1
Sub channel 2 Factory
setting
Change to
Description
Page
ARR
1
20
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 1 >
Collector 1
CEM1
270 °F
Collector emergency temperature 1
80
OCCO1**
OFF
Option collector cooling 1
80
CMAX1
230 °F
Maximum collector temperature 1
80
OCMI1
OFF
Option collector minimum limitation 1
80
Sensor/Ter-
minal
Designation
Description
S1
TCOL1
Temperature collector 1
S2
TSTB
Temperature tank bottom
S3
TSTT/TSTR Temperature tank top/
Temp. tank return preheating
S4
TRET
Temperature - return
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
Return preheating
R4
Backup heating/tank loading pump
System 20
Solar system with east-/west collectors, thermostatic backup heating and return preheating
R3
R4
R2
R1
S5
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 bottom