Som 9s – STIEBEL ELTRON SOM 9s User Manual
Page 27
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SOM 9s
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.
With another temperature differential function (S3/S4)
heating circuit backup (heating circuit return preheating) is
possible via a valve (R2). With a thermostat function (S3)
domestic hot water backup heating (R4) can be carried out.
Sensor/Ter-
minal
Designation
Description
S1
TCOL
Temperature collector
S2
TSTB
Temperature tank bottom
S3
TSTT/TSTR Temperature tank top/
Temp. tank return preheating
S4
TRET
Temperature - return
S5
Optional sensor for measurement
purposes or options
VFS
RPS
V40
Relay
Description
R1
Solar pump
R2
Return preheating
R3
optional:
Thermal disinfection
Booster pump
Parallel relay
Heat dump
R4
Backup heating/tank loading pump
Adjustment channels
Channel
Sub channel 1
Sub channel 2 Factory
setting
Change to
Description
Page
ARR
1
10
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 >
Collector
CEM
270 °F
Collector emergency temperature
80
OCCO**
OFF
Option collector cooling
80
System 10
Solar system with 1 tank, heating circuit return preheating and thermostatic backup heating
R4
R2
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