Speed control
DT S
Set temperature difference
Adjustment range: 1.5 … 30.0 K [3.0 … 60.0 °Ra]
Factory setting: 10.0 K [20.0 °Ra]
Note:
For pump speed control, the operating mode of the corresponding relay
must be set to Auto (adjustment channel MAN).
RIS
Rise
Adjustment range: 1 … 20 K [2 … 40 °Ra]
Factory setting: 2 K [4 °Ra]
If the temperature difference reaches or exceeds the switch-on temperature differ-
ence, the pump switches on at 100% speed for 10 s. Then, the speed is reduced to
the minimum pump speed value.
If the temperature difference reaches the adjusted set value, the pump speed in-
creases by one step (10 %). The response of the controller can be adapted via the
parameter Rise. Each time the difference increases by the adjustable rise value, the
pump speed increases by 10 % until the maximum pump speed of 100% is reached.
If the temperature difference decreases by the adjustable rise value, pump speed
will be decreased by one step.
Note:
The set temperature difference must be at least 0.5 K [1 °Ra] higher than
the switch-on temperature difference.
Minimum speed
nMN
Speed control
Adjustment range: 30 … 100 %
Factory setting: 30 %
If ODB is activated: 50 %
A relative minimum pump speed can be allocated to the output R1 via the adjust-
ment channel nMN.
Note:
The pump speed must be set to 100 % when auxiliary relays or valves are
connected.
Maximum store temperature
S MX
Maximum store temperature
Adjustment range: 4 … 95 °C [40 … 200 °F]
Factory setting: 60 °C [140 °F]
If the store temperature reaches the adjusted maximum temperature, the store will
no longer be loaded in order to avoid damage caused by overheating. A non-adjust-
able hysteresis of 2 K [4 °Ra] is set for the maximum store temperature.
If the maximum store temperature is exceeded, ☼ is displayed.
Note:
If the collector cooling or the system cooling function is activated, the ad-
justed maximum store temperature may be exceeded. In order to prevent
system damage, the controller is also equipped with an integrated store
emergency shutdown, deactivating the system if the store reaches 95 °C
[200 °F].
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