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General note:
Parameters
Room temperature
control
Display
Room temperature
/
Outdoor temperature
using the bus
Siemens
Smart Infrastructure
3.
Functions
3.1
Room temperature control
Information for setting the control parameters (e.g. P02) is described in
section 3.13.
The thermostat acquires the room temperature using its built-in sensor, external
room temperature sensor (QAA32), or external return air temperature sensor
(QAH11.1), and maintains the setpoint by delivering actuator control commands to
the heating equipment. The following control outputs are available:
• SPDT relay On/Off control with free potential free input AC 24...230 V
The switching differential or proportional band is 1 K for heating mode (adjustable
via P30).
In addition, VRF HMI can be used for sending setpoint adjustment commands to
corresponding indoor VRF unit via a third party KNX/VRF gateway and the
temperature control is determined by the values between the room temperature
detected by VRF indoor unit and temperature setpoint received from RDF880KN...
Use and to select and display either the acquired room temperature or
relative humidity. Both values are obtained via built-in sensors. There is no
humidity control function in the unit. The relative humidity value is displayed to
advise the users to switch the VRF operating mode to Dehumidification (if
available) to maintain a comfort environment.
The temperature display can be set to acquire room temperature or the Comfort
setpoint, which is selected via P06. The factory setting displays the current room
temperature and relative humidity.
Use P05 and P23 to calibrate the room temperature value in degree Celsius °C
and the relative humidity value in % respectively while F is not available in this
unit.
The acquired room temperature (built-in or external sensor) is also available as
information on the bus.
If the outdoor temperature is available via KNX bus, then use and to select
the outdoor temperature. The temperature value is a display-only information.
In S-Mode, the corresponding communication object needs to be bound with a
KNX sensor device for obtaining outdoor temperature.
RDF880KN..
Basic documentation
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A6V12318532_en--_a
2021-03-22
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