STIEBEL ELTRON SOM 10 - Manual (Page 56)

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56
Return preheating The return preheating function can be used for trans-
ferring heat from a heat source to the heating circuit
return.
The allocated relay is energized when both switch-on
conditions are fulfilled:
• the temperature difference between the allocated
sensors has exceeded the switch-on temperature
difference
• the temperature at the outdoor temperature
sensor has fallen below the adjusted outdoor
temperature
With the summer switch-off option, the return pre-
heating can be suppressed outside the heating period.
If the heating circuit concerned is controlled by the
controller, the adjustments automatically adapt to the
heating circuit.
Sensor HS Relay
Sensor
Return
Adjustment channel Description Adjustment range / selection Factory setting
Relay Relay selection system dependent system dependent
Sen. Return Return sensor selection system dependent system dependent
Sen. HS Heat source sensor selection system dependent system dependent
∆Ton Switch-on temperature difference 2.0 ... 30.0 K [4.0 ... 60.0 °Ra] 6.0 K [12.0 °Ra]
∆Toff Switch-off temperature difference 1.0 ... 29.0 K [2.0 ... 58.0 °Ra] 4.0 K [8.0 °Ra]
Summer off Summer switch-off option Yes, No No
Sensor Outdoor sensor selection system dependent system dependent*
Toff Switch-off temperature 10 ... 60 °C [50 ... 140 °F] 20 °C [68 °F]
Funct. Activation / Deactivation Activ., Deactivated Deactivated
Arrangement / Opt. functions / Add new function... / Ret. preheat.
* When a heating circuit has been activated, this
adjustment is determined by the corresponding
parameter in the heating circuit menu.