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In order to protect the pumps against blocking after
a standstill, the controller is equipped with a blocking
protection function. This function switches on the
store loading pump every day at 00:00 a.m. for 10 s
at 100 % speed.
Blocking protection
Scheme 1
Scheme 2
Scheme 3
Scheme 4
R1, R2
R1, R2, R4
R1, R2, R4
R1, R2, R3
Scheme 5
Scheme 6
R1, R2, R3, R4 R1, R2, R3, R4
Heat exchanger
The relay (R2) is energised if one of the selected
stores can be loaded and there is a temperature dif-
ference between the sensor of the corresponding
store and the solar fl ow (S2).
The relay is switched off if this temperature difference
falls below the adjusted switch-off difference.
Sensor S2 is always used as the reference sensor.
The heat exchanger is protected by a non-adjustable
antifreeze function.
When the temperature at the reference sensor ext.
HX (S2) falls below the non-adjustable antifreeze
temperature (10 °C), the controller will activate the
secondary pump at 100 % speed. The antifreeze func-
tion will use heat from the store with the highest
temperature. When all stores have reached 10 °C, the
secondary pump will be switched off. If the tempera-
ture at the reference sensor ext. HX (S2) exceeds the
antifreeze temperature by 2 K, the antifreeze function
will be switched off.
The heat exchanger antifreeze function works inde-
pendently from solar loading.
Adjustment channel
Description
Adjustment range / selection
Factory setting
Δ
Ton
Switch-on temperature difference
1.0 … 20.0 K
10.0 K
Δ
Toff
Switch-off temperature difference
0.5 … 19.5 K
5.0 K
Overrun
Overrun time
0 … 15 min
2 min
Minimum speed
Minimum speed
30 … 100 %
30 %
Solar / Basic settings / HX
Note:
The switch-on temperature difference must
be at least 0.5 K higher than the switch-off
temperature difference.
