Som 9s – STIEBEL ELTRON SOM 9s User Manual
Page 23
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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 (S4/S3),
backup heating of the tank can be carried out with a solid
fuel boiler (R3).
Sensor/Ter-
minal
Designation
Description
S1
TCOL
Temperature collector
S2
TSTB
Temperature tank bottom
S3
TSTT
Temperature tank top
S4
TSFB
Temperature solid fuel boiler
S5
Optional sensor for measurement
purposes or options
VFS
RPS
V40
Relay
Description
R1
Solar pump
R3
Loading pump solid fuel boiler
R2
optional:
Thermal disinfection
Booster pump
Parallel relay
Heat dump
R4
Adjustment channels
Channel
Sub channel 1
Sub channel 2 Factory
setting
Change to
Description
Page
ARR
1
8
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
CMAX
230 °F
Maximum collector temperature
80
OCMI
OFF
Option collector minimum limitation
80
System 8
Solar system with 1 tank and backup heating with solid fuel boiler
R3
R1
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