The function ensures that information is synchronized and correct between
manager and subordinates. See Send heartbeat and receive timeout [➙ 126].
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 [➙ 108].
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.
4.6.11 IAQ - CO2 monitoring and control (RDG2..KN)
RDG204KN and RDG264KN with built-in CO
2
sensor can be used for:
● Monitoring CO
2
levels in the room and notifying users to act (e.g., opening the
windows) or operating external equipment, in case of high CO
2
concentrations.
● Controlling CO
2
levels by operating external equipment and providing fresh air
to the room when concentration exceeds the selected IAQ setpoint. The IAQ
control only runs when the thermostat operating mode is Comfort.
Note:
The thermostats / CO
2
sensors are maintenance free, and the typical applications
are offices, schools, museums, shops, etc.
However, to maintain accurate CO
2
readings over time, the thermostat must be
exposed to the fresh air on regular basis. This is generally the case in well
ventilated buildings over night without human presence or when windows are
opened.
As a consequence, we recommend not installing RDG2..4KN in spaces where
there is 24h/7 occupancy, such as hospitals, airports, hotel lobbies.
The easiest way to monitor CO
2
levels in a room or building, e.g. school or office, is
to install or replace the existing thermostat with RDG2..4KN, with its built-in CO
2
sensor and ability to provide CO
2
indications on the screen and over the bus.
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