Som 9s – STIEBEL ELTRON SOM 9s User Manual
Page 62
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SOM 9s
The controller compares the temperatures at the collector
sensors S1 and S5 to the tank temperatures at the sensors
S2 and S3. If one of the measured temperature differences is
higher than the adjusted switch-on temperature differences,
the corresponding 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 priority logic effects prior loading of the upper zone
of the tank.
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
25
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
Sensor/Ter-
minal
Designation
Description
S1
TCOL1
Temperature collector 1
S2
TSTB
Temperature tank bottom
S3
TSTT
Temperature tank top
S4
Optional sensor for measurement
purposes or options
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 top/bottom
R4
Backup heating/tank loading pump
System 25
Solar system with east-/west collectors, vertical tank loading and thermostatic backup heating
R4
R3
R2
R1
S5
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