STIEBEL ELTRON SOM 7 PLUS, Operation And Installation

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System layout 4
S2
R1
S3
R2
S1
The controller calculates the temperature differences between
collector sensor S1 and tank sensors S2 and S3. If the
differences are larger than or identical to the adjusted switch-
on temperature differences (DT1O / DT2O), the solar pump will
be operated by relay 1, and the respective tank zone will be
loaded until the switch-off temperature differences (DT1F /
DT2F) or the maximum tank temperatures (S1MX / S2MX) are
S4 / TR
Arr 4
Display Channels
Channel
Description Terminal Page
COL x Temperature collector S1 37
TSTB x Temperature tank 1 bottom S2 37
TSTT x Temperature tank 1 at the top S3 37
S4 x Temperature sensor 4 S4 37
TR x* Temperature return sensor S4 37
n % x Pump speed relay R1 38
hP1 x Operating hours R1 R1 38
hP2 x Operating hours R2 R2 38
kWh
x*
Heat quantity kWh - 38
MWh
x*
Heat quantity MWh - 38
TIME x Time - 34
reached. The priority logic causes priority loading of the upper
zone of the tank, if possible. The 3-way-valve will be operated
by relay 2 then.
Sensor S4 can optionally be connected for measurement
purposes.
If energy metering (OHQM) is activated, sensor S4 has to be
connected as return sensor.