36
en
The heat exchanger is protected by a non-adjustable antifreeze function.
When the temperature at the Reference sensor ext. HX falls below the non-ad-
justable antifreeze temperature (10 °C), the controller will activate the secondary
pump at 100 % speed. The antifreeze function will use heat from the store that has
the highest temperature. When all stores have reached 10 °C, the secondary pump
will be switched off. If the temperature at the Reference sensor ext. HX exceeds
the antifreeze temperature by 2 K, the secondary pump will be switched off.
The heat exchanger antifreeze function works independently from solar loading.
Note:
Because of the special hydraulics in systems with 2 collectors, the Target
temperature function will not work properly there.
Tube collector function
Solar / opt. functions / Add new function / Tube collector
Adjustment
channel
Description
Adjustment range /
selection
Factory setting
Start
Start time frame
00:00 … 23:00
08:00
Stop
Stop time frame
00:30 … 23:30
19:00
Run
Pump runtime
5 … 600 s
30 s
Break
Standstill interval
1 … 60 min
30 min
Delay
Pump delay
5 … 600 s
30 s
Collector
Collector fi eld
system dependent
system dependent
Funct.
Activation / Deactivation
Activated, Deactivated
Deactivated
This function is used for improving the switch-on behaviour in systems with
non-ideal sensor positions (e. g. with some tube collectors).
This function operates within an adjusted time frame. It activates the collector
circuit pump for an adjustable runtime between adjustable pauses in order to com-
pensate for the delayed temperature measurement.
If the runtime is set to more than 10 s, the pump will be run at 100 % for the fi rst
10 s of the runtime. For the remaining runtime, the pump will be run at the adjusted
minimum speed.
If the collector sensor is defective or the collector is blocked, this function is sup-
pressed or switched off.
2-collector systems
In 2-collector systems, the tube collector function is available for each individual
collector fi eld.
The tube collector function will remain inactive for a collector fi eld which is used
for solar loading.
Target temperature
Solar / opt. functions / Add new function / Target temperature
Adjustment
channel
Description
Adjustment range /
selection
Factory setting
Target temp.
Target temperature
20 … 110 °C
65 °C
Sensor
Reference sensor
system dependent
system dependent
Rise
Rise value
1.0 … 20.0 K
2.0 K
Funct.
Activation / Deactivation
Activated, Deactivated Deactivated
When the Target temperature function is activated, the pump speed control
logic changes. The controller will remain at the minimum pump speed until the tem-
perature 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 function (see page 35) has been activated, too, the target temper-
ature control will pause while the external heat exchanger is loaded. While the ex-
ternal heat exchanger is loaded, its own pump speed control will come into effect.
Содержание BW/H Komfort HE
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