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15
InstallationIndications, functions and optionsMessages Commissioning Operation and function
Ⓢ starts ashing and the heat quantity value will be set back to zero.
Î In order to nish the reset process, press button 3.
In order to interrupt the reset process, do not press any button for about 5 s. The
display returns to the display mode.
Operating hours counter
h P
Operating hours counter
Display channel
The operating hours counter accumulates the operating hours of the correspond-
ing relay (h P). Full hours are displayed.
The accumulated operating hours can be set back to zero. As soon as an operating
hours channel is selected, the symbol Ⓢ is displayed.
Î In order to access the reset mode of the counter, press button 3 for approx. 2 s.
Ⓢ starts ashing and the operating hours will be set back to zero.
Î In order to nish the reset process, press button 3.
In order to interrupt the reset process, do not press any button for about 5 s. The
display returns to the display mode.
6.2 Adjustment channels
∆T control
DT O
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
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.
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General