STIEBEL ELTRON SOM 10 - Manual (Page 43)

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Solar external heat exchanger This function is used to link loading circuits that are
separated by an external heat exchanger.
The allocated relay is energized if one of the selec-
ted stores is being loaded and there is a temperature
difference between the sensor of the corresponding
store and the solar flow.
Any number of the solar stores can be selected.
The relay is switched off if this temperature difference
falls below the adjusted switch-off difference.
In contrast to the bypass function, a differential con-
trol between Sensor HX and the store temperature
can be carried out by means of the heat exchanger
relay.
The reference sensor can be arbitrarily allocated.
In systems in which stores are equipped with their
own loading pumps, the relay “external heat ex-
changer“ controls the primary circuit pump.
The heat exchanger is protected by a non-adjustable
antifreeze function.
Note:
Because of the special hydraulics, the target
temperature option will not work properly
in systems with 2 collector fields.
Adjustment channel Description Adjustment range / selection Factory setting
Relay Relay selection system dependent system dependent
Min speed Minimum speed 30 ... 100 % 30 %
Store Sensor selection system dependent 1
Sensor HX Reference sensor ext.HX system dependent system dependent
Targ. temp. Target temperature option Yes, No No
Sensor
Target temperature reference
sensor
system dependent system dependent
Targ. temp. Target temperature 15 ... 95 °C [60 ... 204 °F] 60 °C [140 °F]
∆Ton Switch-on temperature difference 1.0 ... 20.0 K [2.0 ... 40.0 °Ra] 10.0 K [20.0 °Ra]
∆Toff Switch-off temperature difference 0.5 ... 19.5 K [1.0 ... 39.0 °Ra] 5.0 K [10.0 °Ra]
Overrun Overrun time 1 ... 15 min 2 min
Solar / Opt. functions / Add new function... / Ext. HX