Description of application and parametersApplication "RTC"Product manual 2CKA001473B9679 │9311.4.7 RTC — Heating controlNoticeOnly available when the "Device function" parameter is set on either "Singledevice" or "Master device" and the control function parameter is set on either"Heating," "Heating with additional stage," "Heating and cooling" or "Heating andcooling with additional stages".11.4.8 Heating control - Control value typeOptions: 2-point 1 bit, Off/On2-point 1 byte, (0/100%)PI continuous, 0-100%PI PWM, On/OffFan coilThe 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 theroom temperature drops below a certain level (setpoint temperature value minushysteresis) and switches off as soon as a particular value (setpoint temperature valueplus hysteresis) is exceeded. The switch-on and switch-off commands are transmittedas 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, whichresults from the difference between setpoint value and actual value. This change cantake on values between 0 and 100%. It sends the control value to the bus as a 1-bytevalue (0% - 100%). To reduce the bus load, the control value can only be transmitted if ithas changed by a predefined percentage in relation to the previously sent value. Thecontrol 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 controlvalue is converted into a pulse-interval signal.– Fan coil:■ The fan coil controller functions similar to the PI continuous controller. In addition, itallows the separate control of the fan in the fan coil unit (e.g. fan speed levels 1..3).NoticeThe "Fan coil" controller type can be set in all 4 controller functions(heating/cooling, basic/additional stage). That is why it is recommended not touse the "Fan coil" controller type in the basic and additional stage of theheating/cooling operating mode.
