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Control functions
Figure 2-13 Control behaviour for the H C VAV controller mode when the controller regulates
based on heating and cooling demand.
2.2 Maximum and minimum limits for heating and cooling output
Maximum and minimum limits for the heating and cooling output signals can be set. Figure 2-14 shows the
configuration settings in Application tool.
Maximum and minimum limits for the VAV output signal are set via the VAV control function, see section
2.6 .
Figure 2-14 Configuration settings for maximum and minimum heating and cooling output limits in Application tool.
The heating output limits are active when the controller is in heating mode, and inactive when the controller
is not in heating mode. When the controller is in heating mode or not is defined by the used controller mode,
see section
2.1 .
Figure 2-15 illustrates how the control behaviour is affected when limits are set for the heating output. For
example, when a 85% maximum limit is set, Heating signal never exceeds 85% of its practical maximum
(100%). When a 20% minimum limit is set, Heating signal is always at least 20%, as long as the controller is
in heating mode.
Y1: Heating signal Y2: Cooling signal
Output
Max: 100%
Heating
setpoint Cooling
setpoint
Min: 0%
Deadband
Room temperature
100% 100% 0% 0%
Cooling demand Heating demand
Y3: VAV signal
51% 49%
Min VAV: 20%
20 Regio Ardo manual, Rev. D