Technical data - Basic Documentation - RDF302 - RDF302.B

Power supply	Rated voltage	AC 230 V
	Overvoltage category	III
	Frequency	50/60 Hz
	Power consumption	Max. 7VA / 3.7 W
Caution	No internal fuse! External preliminary protection with max C 10 A circuit breaker required in all cases.
Outputs	Fan control Q1, Q2, Q3-N Rating	AC 230 V 5 mA…5(2) A
Note!	Fans must NOT be connected in parallel! Connect one fan directly, for additional fans, one relay for each speed.
	Control output Y11-N / Y21-N (N.O.) Rating	AC 230 V 5 mA…5(2) A
Caution	No internal fuse! External preliminary protection with max C 10 A circuit breakers in the supply line required in all cases.
Inputs	Multifunctional input X1-M/X2-M ^**) Temperature sensor input: Type Temperature range Cable length Digital input: Operating action Contact sensing Parallel connection of several thermostats for one switch Insulation against mains voltage (SELV)	NTC (3 kΩ at 25 °C) 0...49 °C Max. 80 m Selectable (NO / NC) SELV DC 0...5 V / max 5 mA Max. 20 thermostats per switch 4 kV, reinforced insulation
Inputs	Function of inputs: ^**) External temperature sensor, heating/cooling changeover sensor, operating mode switchover contact, dew point monitor contact, enable electrical heater contact, fault contact, monitoring input	Selectable X1: P38 X2: P40
Modbus	Interface type	RS485 Modbus RTU, Wire (ref.): 16 AWG, 1 pair, shielded serial line with 1.5 mm² and length < 1200 m
	Bus current	Max. 50 mA
	Modbus topology: See Modbus manual (MODBUS over serial line specification and implementation guide from http://www.modbus.org ).
Operational data	Switching differential, adjustable Heating mode (P30) Cooling mode (P31)	2 K (0.5...6 K) 1 K (0.5...6 K)
	Setpoint setting and range Comfort (P08) Economy (P11-P12) Protection (P11-P12)	21 °C (5...40 °C) 15 °C/30 °C (OFF, 5...40 °C) 8 °C/OFF (OFF, 5...40 °C)
	Multifunctional input X1/X2 ^**) Input X1 default value (P38) Input X2 default value (P40)	Selectable 0...8 3 (Op. Mode switchover) 1 (External temp. sensor)
	Built-in room temperature sensor Measuring range Accuracy at 25 °C Temperature calibration range	0…49 °C < ± 0.5 K ± 3.0 K
	Settings and display resolution Setpoints Current temperature value displayed	0.5 °C 0.5 °C
Environmental conditions	Storage Climatic conditions	As per IEC 60721-3-1 Class 1K3
	Transport Climatic conditions	As per IEC 60721-3-2 Class 2K3
	Operation Climatic conditions	As per IEC 60721-3-3 Class 3K5 ¹⁾
Standards and directives	EU Conformity (CE)	CE1T3079xx ^*)
	RCM	A5W90002895 ^*)
	Electronic control type Home and Building Electronic Systems	2.B (micro-disconnection on operation) EN 50090-2-2
	Safety class	II as per EN 60730
	Pollution class	Normal
	Housing flammability class according to UL94	V-0
	Degree of protection of housing	IP 30 as per EN 60529
Environmental compatibility	The product environmental declaration CE1E3079en (RDF302) ^), A5W00085839A (RDF302/VB) ^), A6V11610192 (RDF302.B) ^*) contains data on environmentally compatible product design and assessments (RoHS compliance, materials composition, packaging, environmental benefit, disposal).
General	Connection terminals	Solid wires or prepared stranded wires 1 x 0.4…1.5 mm²
	Housing front color	RAL 9003 white RAL 9004 black
	Weight without / with packaging	0.174 kg/0.261 kg

^*) The documents can be downloaded from http://siemens.com/bt/download.

^**) RDF302.B does not have inputs X1 and X2. Parameters related to X1 and X2 input functions are not applicable to RDF302.B.

¹⁾ No condensation is allowed.

Index

1-speed fan 35

3-position control signal 32

3-speed fan 35

Applications overview 16

Automatic heating / cooling changeover 20, 23

Automatic heating / cooling changeover via bus 20

Basic application 29

Changeover switch 20

Chilled / heated ceiling applications 29

Clean fan filter reminder 36

Compressor applications 16, 29

Control outputs configuration 33

Control outputs overview 32

Control parameters 47

Control sequences 23

Cooling sequence 23

Dew point monitoring 22, 38

Disposal 54

Electric heater 25

Enable / disable electric heater 25, 38

Expert level parameters 47

External / return air temperature 37

External / return air temperature sensor 21

Fan kick function 35

Fan minimum on-time 35

Fan operation as per heating / cooling mode, or disabled 35

Fan operation in dead zone 35

Fan overrun 36

Fan start 35

Fault 38

Fault on KNX 40

Fault, handling 39

Floor cooling 21

Floor heating 21

Floor temperature limitation function 21

Heating / cooling changeover 20, 37

Heating and cooling sequence 23

Heating sequence 23

Integral action time 10

Key lock 22

Main and secondary 27

Manual heating / cooling changeover 20

Manually select heating or cooling sequence 23

Minimum output 21

Moisture 21

Mounting and installation 51

Multifunctional inputs 37

ON/OFF control signal 32

Operating mode

Priority intervention 12

Operating mode button 12

Operating mode switchover 38

Parameter setting 47

Proportional band 10

Protection mode / Standby 11

Purge function 21

Radiator applications 29

Remote heating / cooling changeover 20

Reset parameters 47

Setpoint Comfort mode 30

Setpoint Economy mode 30

Setpoint limitation 13

Setpoint Protection mode 30

Setpoints and sequences 30

Standby / Protection mode 11

Switching differential 10

Synchronization 33

Temperature out of range 39

Temporary setpoint 13

Universal applications 16

Window contact 13

Window state 11, 38

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Smart Infrastructure

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Theilerstrasse 1a

CH-6300 Zug

Tel. +41 58 724 2424

Technical data - Basic Documentation - RDF302 - RDF302.B - RDF302/VB

Semi-flush mount room thermostats with RS485 Modbus communications RDF302, RDF302.B, RDF302/VB