Regin REGIO EEDO, Manual, Page: 10 / 108

Control functions
The controller acts as a cooling controller and regulates based on the cooling setpoint and the current room
temperature.
The controller is always in cooling mode and outputs a cooling signal, Y1, that is configured on the controller
outputs by using the configuration values listed in
Table 2-4 .
Maximum and minimum limits for the output signal can be set, see section 2.2 .
Table 2-4 Controller output configuration values and controller output types.
Output signal Controller output configuration value Controller output type
Y1 Cooling Analog
Cooling valve, increase
Cooling valve, decrease Digital
Digital
Cooling valve, thermal (PWM) Digital
Figure 2-5 illustrates the control behaviour for this controller mode when no maximum or minimum limits
are set.
The cooling demand increases as the room temperature rises. When the room temperature rises above the
cooling setpoint,
Y1: Cooling signal increases to respond to the cooling demand. At 100% cooling demand,
Y1: Cooling signal reaches its maximum.
When the room temperature is lower than the cooling setpoint and no cooling demand exists , Y1: Cooling
signal is at its minimum.
Figure 2-5 Control behaviour for the Cooling controller mode.
2.1.5 Heating/Cooling (change-over)
This controller mode is suitable for room HVAC systems that use a 2-pipe fan coil as heating and cooling
device. The change-over function makes it possible to use the controller in a 2-pipe change-over system,
where warm or cold media flow in the same pipes and one valve is used to regulate both heating and cooling
distribution. See section
2.3 for information about the change-over function.
The controller acts as a heating or cooling controller and regulates based on the heating setpoint, cooling
setpoint, and the current room temperature.
The controller is either in heating or cooling mode, and switches between the modes according to its current
change-over state, see section
2.3 .
When the controller is in heating or cooling mode, the controller outputs a heating or cooling signal, Y1, that
is configured on the controller outputs by using the configuration values listed in
Table 2-5 .
Y1: Cooling signal
Output
Max: 100%
Cooling
setpoint
Min: 0%
Room temperature
100%
0%
Cooling demand
10 Regio Eedo manual, Rev. D