Siemens RDF302 Documentation page 20

Parameter P51
OFF
OFF
10...50 ˚C
10...50 ˚C
Application Output Y11
2-pipe H/C valve
2-pipe & el heater H/C valve
4-pipe Heating valve
Note
Dew point monitoring
Fault state
Fault information
Button lock
Button lock command
20 / 58
Siemens
Building Technologies
The table below shows the relation between parameter, temperature source and
temperature display:
External temp. Source for display of
sensor available room temperature
No Built-in sensor
Yes External temp. sensor
No Built-in sensor
Yes Built-in sensor
The "Floor temperature limitation" function influences the outputs listed in the table
below:
Output Y21
El heater
Cooling valve
*) If P13 = ON  electric heater in cooling mode
Either floor temperature sensor or external room temperature sensor can be used.
Dew point monitoring is essential to prevent condensation on the chilled ceiling
(cooling with fan disabled, parameter P52). 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 Modbus.
The input must be commissioned accordingly (P38, P40).
See section 3.9 "Multifunctional input".
Manual "button lock" function is enabled by parameter P14 (0=Disabled, 1=Auto
lock, 2=Manual lock).
When P14=2, press operating mode button
buttons. If "Auto lock" is configured (P14=1), the thermostat will automatically lock
all the buttons 10 seconds after the last adjustment and the way to unlock the
buttons is the same as per manual lock.
The Button lock command from the Modbus has higher priority to execute. Users
are not able to change the operating mode by pressing the key button on the unit
to release the button lock unless an unlock command received from the Modbus.
The button lock command from the Modbus provides several levels of functions:
A = Lock all buttons
B = Lock operating mode button only
C = Lock fan button only
D = Lock temperature adjusting buttons (+ & -) only.
E = Unlock
RDF302 Basic documentation
Functions
Output control
according to
Built-in sensor
External temp. sensor
Built-in sensor
Built-in sensor + limit
by external sensor
"Floor temp. limit" function has impact on
Heating Cooling
(P01 = 0/2/3) (P01 = 1/2/3)
Y11 N/A
Y21 Y21 *)
Y11 N/A
for 5 seconds to lock or unlock all the
Floor temp.
limit
function
Not active
Not active
Not active
Active
Heat. and cool
(P01 = 4)
Remark
Only el heater
Y11
CE1P3079en
07 Dec 20111