Regio Midi manual
Chapter 9
Setpoint calculation
47
Chapter 9 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 (see
Table 3
). 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.
On models with display, the basic setpoint is set in the display.
On all models, you can also configure the setpoints via a central system or Regio tool
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. When
the model has DIP switches, the latest setpoint change will be valid.
Setpoint offset
On all models, except RC-C3H and RC-CTH, 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 configured in Regio tool
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or in the parameter menu in the display (FS= ± 3°C).
In models with display, you 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.
RC-C3H and RC-CTH have neither display nor setpoint knob. On these models, the setpoint
is adjusted from the back of the electronics cassette with a small screwdriver.
Calculation of the active setpoint
What setpoint value the controller should control according to depends on the operating mode,
the control mode and the current 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 heating 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 cooling 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 adjustment) and the cooling setpoint is 27°C ± 3°C (local
adjustment). 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.
