AIAS RC Techsheet IMO
AIAS Room controller - installation and operation instruction | 7 / 26
Different control modes
The controllers can be congured for different control modes/control sequences. Depending on which control mode is active, one,
both or all three of the universal outputs, UO1, UO2 and UO3, are used. See table below for a summary.
Control mode UO1* UO2* UO3**
Heating Heating - VAV damper/EC fan
Heating/Heating (split output signal) Heating Heating VAV damper/EC fan
Heating or cooling via change-over Heating or cooling - VAV damper/EC fan
Heating/Cooling Heating Cooling VAV damper/EC fan
Heating/Cooling with VAV-control and forced supply air function Heating Cooling VAV damper/EC fan
Heating/Cooling with VAV-control Heating Cooling VAV damper/EC fan
Cooling Cooling - VAV damper/EC fan
Cooling/Cooling (split output signal) Cooling Cooling VAV damper/EC fan
Heating/Cooling/VAV
(only available in -C3- models, except C3DFOC) Heating Cooling VAV damper/EC fan
Heating/Heating or Cooling via change-over
(only available in fan models)
Heating Cooling VAV damper/EC fan
Heating
In control mode Heating, the unit is always a heating controller and controls according to the heating setpoint plus/minus the setpoint
adjustment. The setpoint can be adjusted in the display or via the setpoint knob.
Heating/Heating
In control mode Heating/Heating, the controller is always a heating controller and controls according to the basic heating setpoint plus
the setpoint adjustment. The control signal is divided between the two outputs with a deadband in between. The rst output (UO1)
works between 0...48 % of the control signal. When the control signal reaches 52 %, UO2 starts to operate and will be 10 V when the
control signal is 100 %. See the gure below:
Heating or cooling via change-over
This control mode is used for installations with 2-pipe systems. It makes it possible to use the same pipe for both heating and cooling,
depending on whether heating or cooling is required. Switching between heating and cooling mode can be performed either by using
a digital or an analogue input. Only one output is used to control the actuator (UO1). See more in the chapter Change-over function.
Heating/Cooling
In control mode Heating/Cooling, the controller functions as a heating controller when the room temperature is lower than the basic
heating setpoint plus half the neutral zone. The neutral zone is the difference in temperature between the heating setpoint and the
cooling setpoint. When the room temperature exceeds this limit, the controller becomes a cooling controller. There is a hysteresis of
0.1°C when the controller changes from heating to cooling controller and vice versa. When the controller is heating, it regulates accor-
ding to the basic heating setpoint plus the setpoint adjustment, and when it is cooling according to the basic cooling setpoint plus the
setpoint adjustment