Som 9s – STIEBEL ELTRON SOM 9s User Manual
Page 11
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SOM 9s
System 2
Solar system with 2 tanks and heat exchange
The controller calculates the temperature difference bet-
ween collector sensor S1 and tank sensor S2. If the diffe-
rence is larger than or identical to the adjusted switch-on
temperature difference, the pump (R1) will be switched on
and the tank will be loaded until the switch-off temperature
difference or the maximum tank temperature is reached.
Heat exchange between S3 and S4 is possible.
Relay
Description
R1
Solar pump
R2
Heat exchange pump
R3
optional:
Thermal disinfection
Booster pump
Parallel relay
Heat dump
R4
Sensor/Ter-
minal
Designation Description
S1
TCOL
Temperature collector
S2
TST1B
Temperature tank 1 bottom
S3
TST1T
Temperature tank 1 top
S4
TST2B
Temperature tank 2 top
S5
Optional sensor for measurement
purposes or options
VFS
RPS
V40
Adjustment channels
Channel
Sub channel 1
Sub channel 2 Factory
setting
Change to
Description
Page
ARR
1
2
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
79
SMAXS
2
Sensor tank max
79
COL >
Collector
CEM
270 °F
Collector emergency temperature
80
OCCO**
OFF
Option collector cooling
80
CMAX
230 °F
Maximum collector temperature
80
OCMI
OFF
Option collector minimum limitation
80
CMIN
50 °F
Minimum collector temperature
80
R4
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