39
When the Target temperature function is activated,
the pump speed control logic changes. The control-
ler 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 adjus-
ted correspondingly.
If the Ext. HX (see page 43) function has beed activa-
ted, 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 eect.
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 system dependent
Rise 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 uid in the loading
circuit against freezing or coagulation.
If the collector temperature exceeds 6 °C [44 °F], this
function is switched o.
Heat will be extracted from the stores according to
the adjusted order. If all stores have reached their
minimum temperature of 5 °C [42 °F], the function
becomes inactive.
The minimum pump speed is set to 100 %.
In 2-collector systems, the antifreeze menu is exten-
ded. The adjustment channels are seperated nume-
rically.
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 o Antifreeze switch-o temperature -39 ... +16 °C [-39 ... +60 °F] +6 °C [+44 °F]
Collector Collector eld system dependent system dependent
Store (1 ... 5) Store succession order system dependent system dependent
Funct. Activation / Deactivation Activ., Deactivated Deactivated
Solar / Opt. functions / Add new function... / Antifreeze
295931-36390-8667 SOM 8 plus_en.indb 39 20.10.2011 13:14:39
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