AIAS RC Techsheet IMO

18 / 26 | AIAS Room controller - installation and operation instruction
Setpoint calculation
Basic setpoint
There are two basic setpoints, one basic heating setpoint
(FS=22°C) and one basic cooling setpoint (FS=24°C). Units
without display have DIP switches to change the setpoints. The
basic cooling setpoint is automatically changed at the same time.
Therefore, the difference between the basic heating setpoint and
the basic cooling setpoint is always the same.
The basic setpoint is set in the display.
You can also congure the setpoints via a central system or
Regio tool©.
Setpoint offset
The setpoint value can be adjusted up and down from the basic
setpoint value, via the setpoint knob or the display. How much
the value can be adjusted can be congured in Regio tool© or in
the parameter menu in the display (FS=+/-3°C).
Use the INCREASE button to increase the current setpoint in steps
of 0.5°C to the max. limit, and the DECREASE button to decrease
the current setpoint in steps of 0.5°C to the min. limit.
Calculation of the active setpoint
What setpoint value the controller should control according to
depends on the operating mode, the control mode and the cur-
rent setpoint offset.
Off
In operating mode Off or on open window the controller is a
heating controller, and controls according to the frost protection
setpoint (FS=8°C), regardless of the setpoint adjustment.
Unoccupied
In operating mode Unoccupied, it controls according to the hea-
ting setpoint (FS=15°C) if a control mode with heating has been
set and the room temperature is lower than this setpoint. If the
room temperature is higher than the cooling setpoint (FS=30°C)
and a control mode with cooling has been set, the unit is a coo-
ling controller and controls according to the cooling setpoint. The
active setpoint changes in the middle of the neutral zone with
a hysteresis of 0.1°C. A setpoint adjustment is not active in this
operating mode.
Stand-by
In operating mode Stand-by the controller controls according
to the basic heating setpoint or the basic cooling setpoint plus/
minus a settable neutral zone (FS=3°C). The setpoint can also
be adjusted via the setpoint knob or display. This means that the
factory setting for the heating setpoint is 19°C +/- 3°C (local ad-
justment) and the cooling setpoint is 27°C +/- 3°C (local adjust-
ment). On heating demand the unit will control according to the
heating setpoint, and on cooling demand it will control according
to the cooling setpoint. The setpoint change takes place halfway
between the setpoints with a hysteresis of 0.1°C.
Occupied/Bypass
In operating modes Occupied and Bypass the unit controls
according to the basic heating setpoint or the basic cooling
setpoint. The setpoint can also be adjusted via the setpoint knob
or display. The setpoint change takes place halfway between the
setpoints with a hysteresis of 0.1°C.
Setpoint display at setpoint adjustment
Parameter 74 is used to set what is shown in the display when
the setpoint is adjusted.
0 = The added adjustment is shown in the display. Example:
+1.5°C. The adjustment is added to both the heating and cooling
setpoints.
1 = The sum of the control setpoint and the adjustment is shown
in the display. Example: The control setpoint is 22°C and the ad-
ded adjustment is +1.5°C. This means that the value 23.5°C will
be shown in the display. ”HEAT” or ”COOL” will ash depending
on which of the setpoint values is the control setpoint when you
enter the setpoint menu, i.e. depending on which setpoint you
are changing. The adjustment is added to both the heating and
cooling setpoints.
2 = The sum of the heating setpoint and the adjustment is shown
in the display. The adjustment is added to both the heating and
cooling setpoints.
3 = The sum of the cooling setpoint and the adjustment is shown
in the display. The adjustment is added to both the heating and
cooling setpoints.