4.6.9 Preventive operation
For the heating coil to reach its temperature, fan start can be delayed by a time
period set via P365.
In very warm and humid climates, the fan runs periodically or continuously at a low
fan speed (e.g., in empty apartments or shops) in Economy mode via P364, to
avoid damage from moisture due to lack of air circulation. Refer to "Fan kick"
function in Fan control [➙ 105].
4.6.10 NFC communication
NFC (near-field communication) is used to commission the thermostat via the
Siemens smartphone application PCT Go.
The distance between smartphone and the thermostat must be max. 2 cm while
scanning the NFC area on the individual package or antenna area of the
thermostat. Data exchange between controller and Siemens smartphone
application is 10 s.
P500 enables/disables NFC communication locally. When disabled (default is
enabled), the application cannot read or write the thermostat and message "NFC
communication is disabled on the thermostat." is displayed.
Using Siemens smartphone application, users can:
● Set, read or download thermostat parameter settings
● Enable or disable password protection by configuring P502
● Import and export the setting parameter list in CSV format
● Set and download schedules
● When NFC communication is enabled, the parameters can be configured even
if the thermostat has no power.
● The phone must have active NFC functionality.
For commissioning via Siemens smartphone application PCT Go, see
Commissioning [➙ 20].
4.6.11 IAQ – CO
2
monitoring and control
RDG204KN and RDG264KN with built-in CO
2
sensor can be used for:
● Monitoring the CO
2
level in the room and informing users of acting (e.g.,
opening the windows) or driving external equipment, in case of high CO
2
concentration.
● Controlling the CO
2
level by driving external equipment and providing fresh air
in the room when the concentration exceeds the selected IAQ setpoint.
The IAQ control only runs when the thermostat operating mode is Comfort.
Note:
The thermostats / CO
2
sensor is maintenance free, and the typical applications are
offices, schools, museums, shops, etc.
However, to maintain accurate CO
2
reading over time, the thermostat needs to be
regularly exposed to the fresh air, as it is the case in well ventilated buildings over
night without human presence or when windows are opened.
Therefore, we don’t recommend installing RDG2..4KN in spaces with 24h/7
occupancy, such as hospitals, airports, hotel lobbies.
The easiest way to monitor CO
2
level in a room or building, e.g. school or office, is
to install or replace the thermostat with RDG2..4KN, which has built-in CO
2
sensor
and provides CO
2
indication on the screen and bus.
The RDG2..4KN can also be used as standalone device. A bus connection is not
required for CO
2
indication on the screen.
The CO
2
monitoring function can be enabled for all fan coil and universal heating /
cooling applications (without fan control).
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