Som 9s – STIEBEL ELTRON SOM 9s User Manual
Page 37
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SOM 9s
The controller compares the temperature at sensor S1 to
the temperatures at sensors S2 and S3. If the measured
temperature differences are higher than the adjusted switch-
on temperature differences, the pump (R1) will be activated
and the corresponding tank zone will be loaded up to the
adjusted maximum temperature at most via the valve (R3).
The priority logic effects prior loading of the upper zone
of the tank.
With another temperature differential function (S3-heat
source/S4-heat sink) heating circuit return preheating (he-
ating circuit backup) is possible via another valve (R2). Do-
mestic hot water backup heating (R4) can be carried out
with a thermostat function (S3).
System 15
Solar system with vertical tank loading and backup heating via heating backup
R4
R3
R2
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
Adjustment channels
Channel
Sub channel 1
Sub channel 2 Factory
setting
Change to
Description
Page
ARR
1
15
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
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
3-port valve tank top/bottom
R4
Backup heating/tank loading pump
Note: 3-port valve normally open - tank bottom