STIEBEL ELTRON SOM 9s - Manual (Page 87)

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SOM 9s
The thermostat function works independently from the
solar operation and can be used for using surplus energy
or for backup heating.
• AH O < AH F
thermostat function for backup heating
• AH O > AH F
thermostat function for using surplus energy
Thermostat function
Backup heating Use of surplus energy
AH / AH O
Thermostat switch-on temp.
Adjustment range: 30...480 °F
in
steps of 1 °F
Factory setting: 110 °F
AH / AH F
Thermostat switch-off temp.
Adjustment range:30...480 °F
in
steps of 1 °F
Factory setting: 120 °F
note:
In systems with east-/west collectors, S5 is not
available.
DT3 / S2DT3
Reference sensor tank 1
Selection: 2, 3
Factory setting: 3
Reference sensor tank 2
Selection: 4, 5
Factory setting: 4
Return preheating
DT3 / S2DT3
Reference sensor
Selection: 3, 5
Factory setting: 3
In order to heat the heating circuit return by means of heat
supplied by the solar circuit, the controller is equipped with
a return preheating function.
If the switch-on temperature difference DT3O between
the sensors S3 or S5 (TSTR) and S4 (TRET) is exceeded, a
3-port valve for heating circuit backup is controlled via the
relay output R2/R3. Free sensors (S3 or S5) can be allocated
for this function (S2DT3).
The reference sensor for the heat exchange function (heat
source) for tank 1 is sensor S3 (TSTT). The reference sensor
(heat sink) for tank 2 (S2DT3) is S4. It can be changed to S5
and is used for the differential function and the maximum
limitation.
For the solid fuel boiler function, the reference sensor (heat
source) for the solid fuel boiler is sensor S4. The reference
sensor (heat sink) for the tank is S3, but it can be changed
to S2.
Allocation of a sensor for the minimum and maximum limi-
tation, instead of S4/S3.