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en
External heat exchanger
Solar / opt. functions / Add new function / Ext. HX
Adjustment
channel
Description
Adjustment range /
selection
Factory setting
Relay
Relay selection
system dependent system dependent
Min. speed
Minimum speed
(20) 30 … 100 %
30 %
Store
Store sensor selection
system dependent 1
Sensor HX
Reference sensor ext. HX
system dependent system dependent
Target temp. Target temperature option
Yes, No
No
Sensor
Target temperature reference sensor system dependent system dependent
Target temp. Target temperature
15 … 95 °C
60 °C
∆
Ton
Switch-on temperature difference
1.0 … 20.0 K
10.0 K
∆
Toff
Switch-off temperature difference
0.5 … 19.5 K
5.0 K
Overrun
Overrun time
1 … 15 min
2 min
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 selected stores is being loaded and
there is a temperature difference between the sensor of the corresponding store
and the solar fl ow.
Any number of the solar stores can be selected.
The relay is switched off if this temperature difference falls below the adjusted
switch-off difference.
In contrast to the bypass function, a differential control 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 heat exchanger relay controls the
primary circuit pump.
CS bypass
Solar / opt. functions / Add new function / CS bypass
Adjustment
channel
Description
Adjustment range /
selection
Factory setting
Collector
Collector fi eld
system dependent
system dependent
Irrad.
Switch-on irradiation
100 … 500 W / m²
200 W / m²
Delay
Delay time
10 … 300 s
120 s
Stmax off
Stmax switch-on suppression
Yes, No
Yes
Funct.
Activation / Deactivation
Activated, Deactivated
Deactivated
The CS bypass function is a different possibility to activate the collector circuit.
To enable the use of the CS bypass function, a CS10 irradiation sensor has to be
connected.
When the CS bypass function is activated, the irradiation value is the switch-on
condition for the collector circuit.
The relay remains switched on if the irradiation value is exceeded for the Delay
time. When solar loading begins or the irradiation value remains below the switch-
on value for the delay time, the relay is switched off.
When the option Stmax off is activated, collector circuit activation is suppressed
as long as all store temperatures are above their respective maximum tempera-
tures.
Note:
If both the CS bypass and the bypass function are activated, the CS bypass
will only affect the bypass.
Summary of Contents for BW/H Komfort HE
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