The accumulated heat quantity can be set back to zero. As soon as one of the dis-
play channels of the heat quantity 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 flashing and the heat quantity value will be set back to zero.
Î In order to finish 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 one of the
display channels of the heat quantity 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 flashing and the operating hours value will be set back to zero.
Î In order to finish 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 tempera-
ture 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:
When the drainback option ODB is activated, the values of the param-
eters 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 previously made in these channels will be overridden and
have to be entered again if ODB is deactivated later on.