STIEBEL ELTRON SOM 10 User Manual

Page 36

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

Relay

Bypass relay

system dependent

Variant

Variant (pump or valve logic)

pump, valve

pump

Sensor

Bypass sensor

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