STIEBEL ELTRON SOM 7 PLUS, Operation And Installation

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18
System layout 5
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 will be loaded
until the switch-off temperature differences (DT1F / DT2F) or
the maximum tank temperatures (S1MX / S2MX) are reached.
R2
S4 / TR
S1
R1
S2 S3
Arr 5
Tank 1
Tank 2
Display Channels
Channel
Description Terminal Page
COL x Temperature collector S1 37
TST1 x Temperature tank 1 bottom S2 37
TST2 x Temperature tank 2 bottom 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
The priority logic causes priority loading of tank 1, if possible.
For loading tank 2 the 3-way-valve will be operated by relay 2.
Sensor S4 can optionally be connected for measurement
purposes.
If energy metering (OHQM) is activated, sensor S4 has to be
connected as return sensor.