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Control functions
Figure 2-15 Control behaviour when maximum and minimum limits are set for the heating output.
The cooling output limits are active when the controller is in cooling mode, and inactive when the controller
is not in cooling mode. When the controller is in cooling mode or not is defined by the used controller mode,
see section
2.1 .
Figure 2-16 illustrates how the control behaviour is affected when limits are set for the cooling output. For
example, if a 85% maximum limit is set, Cooling signal never exceeds 85% of its practical maximum (100%).
When a 20% minimum limit is set, Cooling signal is always at least 20%, as long as the controller is in cooling
mode.
Figure 2-16 Control behaviour when maximum and minimum limits are set for the cooling output.
2.3 Change-over
Change-over is a control function that enables the controller to provide both a heating or a cooling signal on
the same controller output. This is achieved by shifting the controller change-over state from
heating to
cooling , and vice versa. The change-over function makes it possible to use the controller in a 2-pipe change-
over HVAC system, where warm or cold media flow in the same pipes and one valve is used to regulate both
heating and cooling distribution.
The controller change-over state is either heating or cooling , and is managed automatically via change-over
detection, see section 2.3.1 . The controller change-over state can also be set manually via the Manual / Auto
settings, or via communication.
Heating signal
Output
100%
Heating
setpoint
0%
Room temperature
100%
0%
Heating demand
Max: 85%
Min: 20%
Cooling signal
Output
100%
Cooling
setpoint
0%
Room temperature
100%
0%
Cooling demand
Max: 85%
Min: 20%
20 Regio Eedo manual, Rev. D