Terminal Allocation - STIEBEL ELTRON SOM 6 PLUS Bedienung Und Installation

The temperature sensors (S1 to S3) are
connected to the following terminals with any
polarity:
1 / 2 = Sensor 1 (e.g. collector sensor 1)
3 / 4 = Sensor 2 (e.g. cylinder sensor 1)
5 / 6 = Sensor 3 (e.g. sensor S3)
7 / 8 = Sensor 4 (e.g. sensor return)
The power supply is connected at the
terminals:
19 = Neutral conductor N
20 = Conductor L
12 = Earth terminal

2.4 Terminal allocation

Standard solar heating system
with 1 cylinder, 1 pump and 4 sensors.
6
5
6  75/
Symbol Description
S1 Collector sensor
S2 Cylinder sensor, bottom
S3 Cylinder sensor, top
(optional)
S4 Sensor for heat meters (option)
R1 Solar circuit pump
20
6
6
5
675/
6
6
6