Technical data

26 / 78
Siemens RDG400KN Basic documentation CE1P3192en
Building Technologies Functions 20 Jul 2010
The QAH11.1 cable temperature sensor for automatic heating / cooling changeover
can be replaced by an external switch for manual, remote changeover:
3076Z03
X2
M
T
X2
M
QAH11.1
T °C
Contact open  heating mode
Contact closed  cooling mode
The sensor or switch can be connected to input terminal X1 or D1 (switch only),
depending on the commissioning of the inputs (P38, P42).
See also section 3.8 “Multifunctional input”.
If manual hea
ting / cooling changeover is commissioned (P01 = 2), then heating /
cooling mode cannot be changed via bus / changeover sensor / switch; it will
remain in the last mode as selected locally via button.
The thermostat acquires the room temperature via built-in sensor, external room
temperature sensor (QAA32), or external return air temperature sensor (QAH11.1),
connected to multifunctional input X1.
Input X1 must be commissioned accordingly. See section 3.8 “Multifunctional
input”.
The floor tem
perature should be limited for 2 reasons: Comfort and protection of
the floor.
The floor temperature sensor, connected to multifunctional input X1, acquires the
floor temperature. If the temperature exceeds the parameterized limit (parameter
P51), the heating valve is fully closed until the floor temperature drops to a level 2
K below the parameterized limit.
This function is factory-set to OFF (disabled).
Input X1 or X2 must be commissioned accordingly (P38 = 1).
See section 3.8 “Multifunctional input”.
Living roo
ms:
Up to 26 °C for long-time presence, up to 28 °C for short-time presence.
Bath rooms:
Up to 28 °C for long-time presence, up to 30 °C for short-time presence.
The table below shows the relation between parameter, temperature source and
temperature display:
Parameter P51
External temp.
sensor available
Source for display of
room temperature
Output control
according to
Floor temp.
limit function
OFF No Built-in sensor Built-in sensor Not active
OFF Yes External temp. sensor External temp. sensor Not active
10...50 ˚C No Built-in sensor Built-in sensor Not active
10…50 ˚C Yes Built-in sensor
Built-in sensor + limit
by external sensor
Active
Changeover switch
Manual heating /
cooling changeover
External / return air
temperature sensor
Floor temperature
limitation function
Recommended values
for P51: