Siemens RDF302 User Manual

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Siemens RDF302 Basic documentation CE1P3079en
Smart Infrastructure 2022-06-17
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
The “Floor temperature limitation” function influences the outputs listed in the table
below:
“Floor temp. limit” function has impact on
output
Application
Output Y11
Output Y21
Heating
(P01 = 0/2/3)
Cooling
(P01 = 1/2/3)
Heat. and cool
(P01 = 4)
Remark
2-pipe
H/C valve
Y11
N/A
2-pipe & el heater
H/C valve
El heater
Y21
Y21 *)
Only el heater
4-pipe
Heating valve
Cooling valve
Y11
N/A
Y11
*) 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 “key lock” function is enabled by parameter P14 (0=Disabled, 1=Auto lock,
2=Manual lock).
When P14=2, press operating mode button
for 5 seconds to lock or unlock all
the 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 key 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 key lock unless an unlock command received from the Modbus.
The key 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
Note
Dew point monitoring
Fault state
Fault information
Key lock
Key lock command

Siemens RDF302 Specifications

General

Brand	Siemens
Model	RDF302
Category	Thermostat
Language	English