STIEBEL ELTRON SOM 10 - Manual (Page 36)

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Depending on whether the bypass is energized by a
valve or by a second pump, a corresponding adjust-
ment can be made in the menu item Variant. Depen-
ding on the variant, different control logics are applied:
Pump:
In this version, a bypass pump is placed in front of the
collector pump.
The bypass pump is first activated when store loading
is possible. If the switch-on condition is fulfilled, the
bypass pump is switched off and the collector circuit
pump is activated.
Valve:
A bypass valve is placed into the solar circuit.
The solar heat exchanger is first bypassed when store
loading is possible. If the above-mentioned switch-on
condition is fulfilled, the bypass relay switches the coll-
ector circuit via the heat exchanger.
Variant valve: Variant pump:
Exemplary schematics for the bypass variants
Adjustment channel Description Adjustment range / selection Factory setting
Collector Collector field system dependent system dependent
Relay Bypass relay system dependent system dependent
Variant Variant (pump or valve logic) pump, valve pump
Sensor Bypass sensor system dependent system dependent
∆Ton Switch-on temperature difference 1.0 ... 20.0 K [2.0 ... 40.0 °Ra] 6.0 K [12.0 °Ra]
∆Toff Switch-off temperature difference 0.5 ... 19.5 K [1.0 ... 39.0 °Ra] 4.0 K [8.0 °Ra]
Funct. Activation / Deactivation Activ., Deactivated Activ.
Solar / Opt. functions / Add new function... / Bypass
Bypass sensor
Relay
Bypass sensor
Relay