43
Solar external heat exchanger This function is used to link loading circuits that are
separated by an external heat exchanger.
The allocated relay is energised if one of the selec-
ted stores is being loaded and there is a temperature
dierence between the sensor of the corresponding
store and the solar ow.
Any number of the solar stores can be selected.
The relay is switched o if this temperature die-
rence falls below the adjusted switch-o dierence.
In contrast to the bypass function, a dierential 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-adjustab-
le antifreeze function.
Note:
Because of the special hydraulics, the target
temperature option will not work properly
in systems with 2 collector elds.
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 dierence 1.0 ... 20.0 K [2.0 ... 40.0 °Ra] 10.0 K [20.0 °Ra]
∆To Switch-o temperature dierence 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
295931-36390-8667 SOM 8 plus_en.indb 43 20.10.2011 13:14:41
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