Som 9s – STIEBEL ELTRON SOM 9s User Manual
Page 33
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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 tem-
perature 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 adju-
sted maximum temperature via the valve (R4). The priority
logic effects prior loading of the upper zone of the tank.
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
R2
optional:
Thermal disinfection
Parallel relay
Heat dump
R3
Loading pump/solid fuel boiler
R4
3-port valve tank top/bottom
Adjustment channels
Channel
Sub channel 1
Sub channel 2 Factory
setting
Change to
Description
Page
ARR
1
13
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
DT2F
8 °R
Switch-off temperature difference 2
78
DT2S
20 °R
Set temperature difference 2
78
RIS2
4 °R
Rise 2
78
S2MAX
140 °F
Tank maximum limitation 2
78
System 13
Solar system with vertical tank loading and backup heating with solid fuel boiler
R4
R3
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
Note: 3-port valve normally open - tank bottom