Description of application and parameters
Application "RTC"
Product manual 2CKA001473B9679
│93
11.4.7 RTC — Heating control
Notice
Only available when the "Device function" parameter is set on either "Single
device" or "Master device" and the control function parameter is set on either
"Heating," "Heating with additional stage," "Heating and cooling" or "Heating and
cooling with additional stages".
11.4.8 Heating control - Control value type
Options:
2-point 1 bit, Off/On
2-point 1 byte, (0/100%)
PI continuous, 0-100%
PI PWM, On/Off
Fan coil
The activation of the heating control valve is selected via the controller type.
– 2-point 1 bit, Off/On:
■
The 2-point control is the simplest type of control. The controller switches on when the
room temperature drops below a certain level (setpoint temperature value minus
hysteresis) and switches off as soon as a particular value (setpoint temperature value
plus hysteresis) is exceeded. The switch-on and switch-off commands are transmitted
as 1-bit commands. Observe switching cycles for switch actuators!
– 2-point 1 byte, (0/100%):
■
This is another two-point control as described above. In this case, however, the switch-
on and switch-off commands are transmitted as 1-byte values (0% or 100%).
– PI continuous, 0-100%:
■
The continuous control has a continuously changing control value as output, which
results from the difference between setpoint value and actual value. This change can
take on values between 0 and 100%. It sends the control value to the bus as a 1-byte
value (0% - 100%). To reduce the bus load, the control value can only be transmitted if it
has changed by a predefined percentage in relation to the previously sent value. The
control value can also be transmitted cyclically.
– PI PWM, On/Off:
■
This also a PI controller. The output is a 1-bit command. For this, the calculated control
value is converted into a pulse-interval signal.
– Fan coil:
■
The fan coil controller functions similar to the PI continuous controller. In addition, it
allows the separate control of the fan in the fan coil unit (e.g. fan speed levels 1..3).
Notice
The "Fan coil" controller type can be set in all 4 controller functions
(heating/cooling, basic/additional stage). That is why it is recommended not to
use the "Fan coil" controller type in the basic and additional stage of the
heating/cooling operating mode.
