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Control functions
Table 2-2 Controller output configuration values and controller output types.
Output signal Controller output configuration value Controller output type
Y1 Heating Analog
Heating valve, increase
Heating valve, decrease Digital
Digital
Heating valve, thermal (PWM) Digital
Y2 Heating 2 Analog
Heating valve 2, increase
Heating valve 2, decrease Digital
Digital
Heating valve 2, thermal (PWM) Digital
Figure 2-3 illustrates the control behaviour for this controller 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,
Y1: Heating signal increases to respond to the heating demand. At 49% heating demand, Y1:
Heating signal reaches its maximum. When the room temperature falls further and the heating demand
exceeds 51%, Y2: Heating 2 signal increases while Y1: Heating signal stays at its maximum. At 100% heating
demand, Y2: Heating signal reaches its maximum.
When the room temperature is higher than the heating setpoint and no heating demand exists, both Y1:
Heating signal and Y2: Heating 2 signal are at their minimum.
Figure 2-3 Control behaviour for the H Heating controller mode.
2.1.3 H Cooling
This controller mode is suitable for room HVAC systems that use a radiator or fan coil as heating device, and
a fan coil or chilled beam as cooling device.
The controller acts as a heating and cooling controller and regulates based on the heating setpoint, cooling
setpoint, and the current room temperature.
The temperature range between the heating and cooling setpoints is defined as the deadband. The controller
is in heating mode when the room temperature is lower than [heating setpoint plus half the deadband], and
in cooling mode when the room temperature is higher than [cooling setpoint minus half the deadband].
When in heating mode, the controller outputs a heating signal, Y1, that is configured on the controller
outputs by using the values listed in
Table 2-3 .
Y2: Heating 2 signal
Output
Max: 100%
Heating
setpoint
Min: 0%
Room temperature
Heating demand
100% 51% 49% 0%
Y1: Heating signal
8 Regio Eedo manual, Rev. D