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∆T control
The controller works as a standard differential controller. If the temperature
reaches or exceeds the switch-on temperature difference, the pump switches on.
When the temperature difference reaches or falls below the adjusted switch-off
temperature difference, the respective relay switches off.
Note:
The switch-on temperature difference must be 0.5 K higher than the
switch-off temperature difference. The set temperature difference must
be at least 0.5 K higher than the switch-on temperature difference.
Note:
In systems with 2 stores or store loading in layers, 2 separate menus
(LOAD and LOAD 2) will be displayed.
Speed control
If the temperature difference reaches or exceeds the switch-on temperature dif-
ference, 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 RIS. 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:
To enable speed control, the corresponding relay has to be set to AUTO
or nLO, nHI (adjustment channel MAN) and the pump control type has
to be set to PULS, PWM A, b, or C (adjustment channel PUMP).
LOAD (1,2) 2/3
PUSH
DT(1,2) O
Switch-on temperature difference
Adjustment range: 1.0 … 50.0 K
Factory setting: 6.0 K
DT(1,2) F
Switch-off temperature difference
Adjustment range: 0.5 … 49.5 K
Factory setting: 4.0 K
DT(1,2) S
Set temperature difference
Adjustment range: 1.5 … 50.0 K
Factory setting: 10.0 K
RIS (1,2)
Rise
Adjustment range: 1 … 20 K
Factory setting: 2 K
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