Siemens RDU341 Basic Documentation page 24

Manual heating /
cooling changeover
External / return air
temperature sensor
Dew point monitoring
K NX
R
Fault state
Fault information
Button lock
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Siemens
Building Technologies
If manual heating / 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 or X2.
Inputs X1 or X2 must be commissioned accordingly. See section 3.8.
Dew point monitoring is essential to prevent condensation on the chilled ceiling.
It helps avoid associated damage to the building.
A dew point sensor with a potential-free contact is connected to multifunctional
input X1 or X2. If there is condensation, the cooling valve is fully closed until no
more condensation is detected, and the cooling output is disabled temporarily.
The condensation symbol " " is displayed during temporary override and the fault
"Condensation in room" will be sent via bus.
The input must be commissioned accordingly (P38, P40).
See section 3.8.
If the "Button lock" function is enabled by parameter P14, the buttons will be locked
or unlocked by pressing the right button for 3 seconds.
If "Auto lock" is configured, the thermostat will automatically lock the buttons 10
seconds after the last adjustment.
RDU341 Basic Documentation CE1P3172en
2015-06-08