User Manual

Functions
Additional functions
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This setting is typically used for cooling applications with fan coil units or split units.
When the thermostat is in cooling mode or in the dead zone, the temperature
setpoint cooling is shifted only when P461 is less than 0 K. The temperature
setpoint heating, if available, remains unchanged. The thermostat guarantees a
minimum dead zone between both setpoints.
When P461 is set to 0 K, the temperature setpoint heating, cooling or both are not
shifted. Dehumidification can be achieved by releasing the relay contact for the
dehumidifier. The release contact is switched on 5% over the high humidity
setpoint and switched off 5% below the setpoint.
The relative humidity measured by the built-in sensor is also displayed if P009 is
set to 5. The sensor can be calibrated (+/-10%) via P007.
When P009 = 5, thermostat can monitor relative humidity via HMI or bus.
For application examples with humidity control, see Humidity control [➙ 129].
4.6.7 Prevention operation
To let the heating coil reach its temperature, the 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 (for example, in empty apartments or shops) in Economy mode by
setting P364, in order to avoid damage from moisture due to lack of air circulation.
Refer to "Fan kick" function in Fan control [➙ 81].
4.6.8 NFC communication
NFC (near-field communication) function is used to commissioning thermostat via
the Siemens smartphone application PCT Go for Android.
The distance between smartphone and the thermostat should be max. 2 cm during
scanning NFC area on the individual package or antenna area of thermostat. The
data exchange between controller and Siemens smartphone application should be
10 s.
P500 enables/disables NFC communication locally or via tool (ETS, ACS or
Siemens smartphone application PCT Go for Android). When it is disabled (default
is enabled), application cannot read or write thermostat and one message “NFC
communication is disabled on the thermostat.” is shown on APP.
Using Siemens smartphone application, user can:
● Enable or disable password protection by configuring P502
● Import and export parameter list with settings in CSV format
● When NFC communication is disabled, the parameters still can be configured if
thermostat has no power supply.
● Phone need have NFC function and the function need to be activated.
Note
P461 = 0 K
Calibration humidity
(P007)
Avoid cold air in heating
mode (P365)
Avoid damage from
moisture (P363, P364)
NFC (P500)
Note: