STIEBEL ELTRON SOM 10 User Manual

Page 39

When the Target temperature function is acti-
vated, the pump speed control logic changes. The
controller will remain at the minimum pump speed
until the temperature at the allocated sensor exceeds
the adjusted target temperature. Only then will the
standard pump speed control start to operate. If the
temperature at the allocated sensor changes by the
adjusted Rise value, the pump speed will be adjusted
correspondingly.
If the Ext. HX (see page 43) function has beed ac-
tivated, too, the target temperature control will pause
while the external heat exchanger is loaded. While
the external heat exchanger is loaded, its own pump
speed control will come into effect.

Target temperature

Adjustment channel Description

Adjustment range / selection Factory setting

Targ. temp.

Target temperature

20 ... 110 °C [68 ... 230 °F]

65 °C [150 °F]

Sensor

Reference sensor

system dependent

Rise

1.0 ... 20.0 K [2.0 ... 40.0 °Ra] 2.0 K [4.0 °Ra]

Funct.

Activation / Deactivation

Activ., Deactivated

Deactivated

Solar / Opt. functions / Add new function... / Target temperature

As soon as the temperature at the collector is 4 °C
[40 °F], the antifreeze function operates the loading
circuit between the collector and the 1st store in or-
der to protect the heat transfer fluid in the loading
circuit against freezing or coagulation.
If the collector temperature exceeds 6 °C [44 °F], this
function is switched off.
Heat will be extracted from the stores according to
the adjusted order. If all stores have reached their mi-
nimum temperature of 5 °C [42 °F], the function be-
comes inactive.
The minimum pump speed is set to 100%.
In 2-collector systems, the antifreeze menu is exten-
ded. The adjustment channels are seperated numeri-
cally.

Antifreeze

Adjustment channel Description

Adjustment range / selection Factory setting

Frost on

Antifreeze switch-on temperature -40 ... +15 °C [-40 ... +58 °F] +4 °C [+40 °F]

Frost off

Antifreeze switch-off temperature -39 ... +16 °C [-39 ... +60 °F] +6 °C [+44 °F]

Collector

Collector field

system dependent

Store (1 ... 5)

Store succession order

system dependent

Funct.

Activation / Deactivation

Activ., Deactivated

Deactivated

Solar / Opt. functions / Add new function... / Antifreeze