Regin REGIO ARDO, Manual, Page: 15 / 134

Control functions
Maximum and minimum limits for the output signals can be set, see section 2.2 .
Output signal Controller output configuration value Controller output type
Y1 Change-over valve Analog
Change-over valve, increase
Change-over valve, decrease Digital
Digital
Change-over valve, thermal (PWM) Digital
Y2 Heating Analog
Heating valve, increase
Heating valve, decrease Digital
Digital
Heating valve, thermal (PWM) Digital
Figure 2-9 illustrates the control behaviour for this mode when no maximum or minimum limits are set.
The heating demand increases as the room temperature falls. When the room temperature falls below the
heating setpoint,
Y2: Heating signal increases to respond to the heating demand. At 100% heating demand,
Y2: Heating signal reaches its maximum. When the room temperature is in the range between the heating
setpoint and the deadband centre, and no heating demand exists, Y2: Heating signal is at its minimum.
The cooling demand increases as the room temperature rises. When the room temperature rises above the
cooling setpoint,
Y1: Change-over (cooling mode) signal increases to respond to the cooling demand. At 100%
cooling demand, Y1: Change-over (cooling mode) signal reaches its maximum. When the room temperature is
in the range between the cooling setpoint and the deadband centre, and no cooling demand exists, Y1:
Change-over (cooling mode) signal is at its minimum.
Figure 2-9 Control behaviour for the H Heating/Cooling (change-over) controller mode when the controller
is in H Cooling mode.
2.1.7 H VAV
This controller mode is suitable for room HVAC systems that use a radiator as heating device, and low
supply air temperature that is distributed into the room via a diffuser damper to provide cooling and fresh
air. The air must be pretreated and cooled, since the diffuser damper itself does not have any cooling
capacity.
The controller acts as a heating and cooling controller and regulates based on the heating setpoint, cooling
setpoint, and the current room temperature. In addition, the controller can be set to regulate based on fresh
air demand instead of cooling demand, or based on cooling demand and fresh air demand simultaneously, see
section
2.6 . The controller regulates based on fresh air demand by using CO
2
control, see section 2.10 .
Y2: Heating signal
Y1: Change-over valve (cooling mode) signal
Output
Max: 100%
Heating
setpoint Cooling
setpoint
Min: 0%
Deadband
Room temperature
100% 100% 0% 0%
Cooling demand Heating demand
Regio Ardo manual, Rev. D 15