en
56
Installation
Indications,
functions and options
Messages
Commissioning
Operation and function
∆
T control
DT O / DT1O / DT2O / DT3O
Switch-on temperature difference
Adjustment range: 1.0 … 20.0 K [2.0 … 40.0 °Ra]
Factory setting: 6.0 K [12.0 °Ra]
The controller works as a standard differential controller. If the temperature reach-
es 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 at least 0.5 K [1 °Ra] higher
than the switch-off temperature difference.
DT F / DT1F / DT2F / DT3F
Switch-off temperature difference
Adjustment range: 0.5 … 19.5 K [1.0 … 39.0°Ra]
Factory setting: 4.0 K [8.0 °Ra]
Note
If the drainback option ODB is activated, the values of the parameters
DT O, DT F and DT S will be adapted to values suiting drainback systems:
DT O = 10 K [20 °Ra]
DT F = 4 K [8 °Ra]
DT S = 15 K [30 °Ra]
Adjustments that have been previously made in these channels will be
overridden and have to be entered again if ODB is deactivated later on.
Speed control
DT S / DT1S / DT2S / DT3S
Set temperature difference
Adjustment range:
1.5 … 30.0 K [3.0 … 60.0 °Ra]
Factory setting: 10.0 K [20.0 °Ra]
RIS / RIS1 / RIS2 / RIS3
Rise
Adjustment range:
1 … 20 K [2 … 40 °Ra]
Factory setting: 2 K [4 °Ra]
Note
For pump speed control, the operating mode of the corresponding relay
must be set to Auto (adjustment channel MAN1 / MAN2).
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.
PUM1 / PUM2
Pump control type
Selection: OnOF, PULS, PSOL, PHEA
Factory setting: PSOL
