Regin REGIO EEDO, Руководство пользователя, Страница: 17 / 108

Control functions
2.1.9 VAV
This controller mode is suitable for room HVAC systems that use 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 cooling controller and regulates based on the 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 2.9 .
The controller is always in cooling mode and outputs a VAV signal, Y1, that is configured on the controller
outputs by using the configuration value listed in
Table 2-9 .
Maximum and minimum limits for the VAV output signal are set via the VAV control function, see section
2.6 .
Table 2-9 Controller output configuration value and controller output type.
Output signal Controller output configuration value Controller output type
Y1 VAV Analog
Figure 2-12 illustrates the control behaviour when the controller regulates based on cooling demand, and
when a minimum limit is set for the VAV output signal.
The cooling demand increases as the room temperature rises. When the room temperature rises above the
cooling setpoint,
Y1: VAV signal increases to respond to the cooling demand. At 100% cooling demand, Y1:
VAV signal reaches its maximum.
When the room temperature is lower than the cooling setpoint and no cooling demand exists , Y1: VAV
signal is at its minimum.
Figure 2-12 Control behaviour for the VAV controller mode when the controller regulates based on cooling demand.
2.1.10 H C VAV
This controller mode is suitable for room HVAC systems that use a radiator as heating device and a chilled
beam as cooling device, where the beam contains a cooling valve and a damper that regulates low supply air
temperature that is distributed into the room to provide cooling and fresh air. The air must be pretreated and
cooled, since the 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 also regulate based on
Y1: VAV signal
Output
Max: 100%
Cooling
setpoint
Min: 0%
Room temperature
100% 0%
Cooling demand
Min VAV: 20%
Regio Eedo manual, Rev. D 17