Basic Documentation RDF302 - siemens-desigo-pxc.ru

s

RDF302

Flush-mounted room thermostats with RS485Modbus communicationsRDF302

Basic documentation

Edition 1.1

CE1P3079en2014-10-16 Building Technologies

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Siemens RDF302 Basic documentation CE1P3079enBuilding Technologies Contents 2014-10-16

Contents

1. About this document ........................................................................... 41.1 Revision history ..................................................................................... 41.2 Reference documents ............................................................................ 41.3 Before you start ..................................................................................... 51.3.1 Copyright ............................................................................................... 51.3.2 Quality assurance .................................................................................. 51.3.3 Document use / request to the reader .................................................... 51.4 Target audience, prerequisites ............................................................... 61.5 Glossary ................................................................................................ 6

2. Summary .............................................................................................. 72.1 Types .................................................................................................... 72.2 Ordering ................................................................................................ 72.3 Functions ............................................................................................... 72.4 Integration via Modbus ........................................................................... 82.5 Equipment combinations ........................................................................ 92.6 Accessories ......................................................................................... 10

3. Functions ........................................................................................... 113.1 Temperature control ............................................................................. 113.2 Operating modes ................................................................................. 123.2.1 Different ways to influence the operating mode .................................... 133.3 Room temperature setpoint .................................................................. 143.3.1 Description .......................................................................................... 143.3.2 Setting and adjusting setpoints ............................................................ 153.4 Applications overview .......................................................................... 163.4.1 Applications for fan coil systems .......................................................... 173.4.2 Applications for Universal systems ....................................................... 183.4.3 Applications for compressor systems ................................................... 193.5 Additional functions .............................................................................. 203.6 Control sequences ............................................................................... 233.6.1 Sequences overview (setting via parameter P01) ................................. 233.6.2 2-pipe fan coil unit................................................................................ 243.6.3 2-pipe fan coil unit with electric heater .................................................. 253.6.4 4-pipe fan coil unit................................................................................ 273.6.5 Chilled / heated ceiling and radiator applications .................................. 293.6.6 Compressor applications...................................................................... 293.6.7 Setpoints and sequences ..................................................................... 303.7 Control outputs .................................................................................... 323.7.1 Overview ............................................................................................. 323.7.2 Control outputs configuration (setting via DIP switches or Modbus

commissioning tool) ............................................................................. 333.8 Fan control .......................................................................................... 343.9 Multifunctional input, digital input.......................................................... 373.10 Handling faults ..................................................................................... 393.11 Modbus RTU mode .............................................................................. 403.11.1 Fault function on Modbus ..................................................................... 403.12 Communication objects ........................................................................ 41

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Siemens RDF302 Basic documentation CE1P3079enBuilding Technologies Contents 2014-10-16

3.12.1 Overview ............................................................................................. 413.12.2 Description of communication objects .................................................. 423.13 Control parameters .............................................................................. 473.13.1 Parameter setting via local HMI............................................................ 473.13.2 Parameter setting / download via Modbus communication tool ............. 473.13.3 Parameters of the “Service level” ......................................................... 483.13.4 Parameters of the "Expert level with diagnostics and test" .................... 49

4. Handling ............................................................................................. 514.1 Mounting and installation ..................................................................... 514.2 Commissioning .................................................................................... 524.3 Operation............................................................................................. 534.4 Disposal .............................................................................................. 54

5. Connection ......................................................................................... 555.1 Connection terminals ........................................................................... 555.2 Connection diagrams ........................................................................... 56

6. Mechanical design ............................................................................. 576.1 General ............................................................................................... 576.2 Dimensions .......................................................................................... 58

7. Technical data .................................................................................... 59

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Siemens RDF302 Basic documentation CE1P3079enBuilding Technologies 2014-10-16

1. About this document1.1 Revision history

Edition Date Changes Section Pages1.1 2014-10-09 As per new software update and compliance update,

as well as other corrections2.53.43.63.7.14.14.47

9162332515459

1.0 07,12.2011 First edition

1.2 Reference documents

Subject Ref Doc No. DescriptionModbus Manual [1] MODBUS over serial line specification and implementation guide

(http://www.modbus.org)RDF302 Room Thermostatwith Modbus Interface

[2] CB1N3079 Data Sheet[3] CB1B3079 Operating Instructions[4] CB1M3079 Installation Instructions

SEZ50MB (RWD Modbus) [5] CB1N3099 Data Sheet[6] CB1P3099 Basic Documentation

https://www.modbus.org/

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1.3 Before you start1.3.1 Copyright

This document may be duplicated and distributed only with the express permissionof Siemens, and may be passed only to authorized persons or companies with therequired technical knowledge.

1.3.2 Quality assurance

This document was prepared with great care.· The contents of this document is checked at regular intervals· Any corrections necessary are included in subsequent versions· Documents are automatically amended as a consequence of modifications and

corrections to the products describedPlease make sure that you are aware of the latest document revision date.If you find lack of clarity while using this document, or if you have any criticisms orsuggestions, please contact the Product Manager in your nearest branch office.The addresses of the Siemens Regional Companies are available atwww.buildingtechnologies.siemens.com.

1.3.3 Document use / request to the reader

Before using our products, it is important that you read the documents suppliedwith or ordered at the same time as the products (equipment, applications, tools,etc.) carefully and in full.We assume that persons using our products and documents are authorized andtrained appropriately and have the technical knowledge required to use ourproducts as intended.More information on the products and applications is available:· On the intranet (Siemens employees only) at

https://workspace.sbt.siemens.com/content/00001123/default.aspx· From the Siemens branch office near you

www.buildingtechnologies.siemens.com or from your system supplier· From the support team at headquarters [email protected] if

there is no local point of contact

Siemens assumes no liability to the extent allowed under the law for any lossesresulting from a failure to comply with the aforementioned points or for theimproper compliance of the same.

https://www.buildingtechnologies.siemens.com/


mailto:[email protected]

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1.4 Target audience, prerequisites

Product & sales managers, distributors, re-sellers & OEM customers who useRDF302 room thermostats in the RS485 Modbus RTU network.

Since Modbus protocol has been well known for years in the industry, thisdocument will explain the operations related to RDF302 Modbus units. e.g. the unitsetup, available settings and their applications. And, users should have the generalknowledge of HVAC systems and local electrical installation regulations whereRDF302 units are employed.

For reference documentation, see section 1.2.

1.5 Glossary

The inputs, outputs and parameters of an application can be influenced in variousways. These are identified by the following symbols in this document:

Term DescriptionDTE Data Terminal EquipmentModbus master A MODBUS device, which is able to access data in one or more

connected MODBUS SlaveModbus slave A MODBUS device, which is able to respond to requests from a

single MODBUS masterPxx Parameters of the device where xx = 00, 01, 02, etc.RDF Modbus The name of RDF302 providing RS485 Modbus communicativeRTU Remote Terminal Unit = Standard MODBUS transmission mode

The communication objects of the RDF302 thermostats are described accordingly.

A list of the parameters is shown in section 3.13.

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2. Summary2.1 Types

Product no. Stock no. Operatingvoltage

Control outputs Housingcolor

3-pos ON/OFFRDF302 S55770-T238 AC 230 V 1 1) 2 1) White

1) Selectable: ON/OFF or 3-position

2.2 Ordering

Order valve actuators separately.

2.3 Functions

Fan coil units via ON/OFF outputs:· 2-pipe system *· 2-pipe system with electric heater· 4-pipe system

Chilled / heated ceilings (or radiators) via ON/OFF outputs:· Chilled / heated ceiling *· Chilled / heated ceiling with electric heater· Chilled / heated ceiling and radiator / floor heating

Compressors: via ON/OFF control· 1-stage compressors in DX type equipment· 1-stage compressors in DX type equipment with electric heater* with both ON/OFF or modulating control output

The room thermostats are delivered with a fixed set of applications.The relevant application is selected and activated during commissioning using oneof the following tools:· Local DIP switch and HMI· Modbus commissioning tools

· Operating modes: Comfort, Economy (Energy Saving) and Protection· ON/OFF or 3-position control outputs (relay)· Output for 3-speed or 1-speed fan· Automatic or manual heating / cooling changeover· Backlit display· AC 230 V operating voltage

Product no. Stock no. DesignationRDF302 S55770-T238 Room thermostat

Use

Features

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· Room temperature control via built-in temperature sensor or external roomtemperature / return air temperature sensor

· Changeover between heating and cooling mode (automatic via local sensor orModbus, or manually)

· Selection of applications via DIP switches or commissioning tool.· Select operating mode via operating mode button on the thermostat· 1- or 3-speed fan control (automatically or manually)· Display of current room temperature or setpoint in °C and/or °F· Display of outdoor temperature or time of day via Modbus· Minimum and maximum limitation of room temperature setpoint· Key lock (automatically, manually or via Modbus)· 2 multifunctional inputs, freely selectable for:

– Operating mode switchover contact (keycard, window contact, etc.)– Sensor for automatic heating / cooling changeover– External room temperature or return air temperature sensor– Dew point sensor– Electric heater enable– Fault input– Monitor input for temperature sensor or switch state

· Advanced fan control function, e.g. fan kick, fan start, selectable fan operation(enable, disable or depending on heating or cooling mode)

· “Purge” function together with 2-port valve in a 2-pipe changeover system· Reminder to clean fan filters· Floor heating temperature limitation· Reload factory settings for commissioning and control parameters· RS 485 Modbus (terminals +, - and REF) for communication with Modbus

compatible devices

2.4 Integration via Modbus

The RDF302 is a communicative thermostat with Modbus open protocol on RTU(Remote Terminal Unit) mode enabling easy integration into BACS via RS-485.

The following Modbus functions are available:· Central controls of room operating modes, setpoints, fan speed and fan mode· Remote monitoring e.g. operating mode, control outputs, temperature sensor

or switch, etc.· Alarming, e.g. external fault contact, condensation, clean filter, etc.· Outside temperature or time of day via bus displayed on thermostat· Key lock

Engineering and commissioning can be done using…– local DIP switches / HMI– via Modbus commissioning tool

Functions

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2.5 Equipment combinations

Description Product no. Datasheet

Cable temperature sensor orchangeover sensorcable length 2.5 mNTC (3 kW at 25 °C)

QAH11.1 1840

Room temperature sensorNTC (3 kW at 25 °C)

QAA32 1747

Cable temperature sensorcable length 4 mNTC (3 kW at 25 °C)

QAP1030/UFH 1854

Condensation monitor / Dew pointmonitor

QXA2601 /QXA2602 /QXA2603 /AQX2604

3302

Electromotoric ON / OFF actuator SFA21... 4863

Electromotoric ON / OFF valve andactuator(only available in AP, UAE, SA and IN)

MVI… / MXI… 4867

Zone valve actuator(only available in AP, UAE, SA and IN)

SUA… 4832

Thermal actuator (for radiator valves) STA23... 4884

Thermal actuator(for small valves 2.5 mm)

STP23... 4884

Electrical actuator, 3-position(for radiator valves)

SSA31... 4893

Electrical actuator, 3-position(for 2- and 3-port valves / V…P45)

SSC31… 4895

Electrical actuator, 3-position(for small valves 2.5 mm)

SSP31… 4864


SSB31... 4891


SSD31... 4861

Electromotoric actuator, 3-position(for small valves 5.5 mm)

SQS35… 4573

Note: For the maximal number of actuators in parallel, refer to information in the datasheets of the selected actuators and to this list, depending on which value is lower:· Parallel operation of max 6 SS… actuators (3-pos) is possible.· Parallel operation of max 10 ON / OFF actuators is possible.· Parallel operation of SQS35 is not possible.

ON / OFF actuators

3-position actuators

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2.6 Accessories

Description Product no. / SSN Datasheet

Changeover mounting kit(50 pcs / package)

ARG86.3 N3009

Plastic mounting spacer for flushmount thermostats to increase theheadroom in the conduit boxby 10 mm

ARG70.3 N3009

Conduit box for flush mountedthermostat

ARG71 / S55770-T137 N3009

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3. Functions3.1 Temperature control

Setting of the control parameters (P01, etc., mentioned throughout the document)is described in section 3.13.

The thermostat acquires the room temperature via built-in sensor, external roomtemperature sensor (QAA32), or external return air temperature sensor (QAH11.1),and maintains the setpoint by delivering actuator control commands to heatingand/or cooling equipment. The following control outputs are available:· ON/OFF control (2-position)· Modulating PI/P control with 3-position control output (only for 2-pipe

applications)

The switching differential or proportional band is 2 K for heating mode and 1 K forcooling mode (adjustable via parameters P30 and P31).The integral action time for modulating PI control is 5 minutes (adjustable viaparameter P35).

The display shows the acquired room temperature or the Comfort setpoint, selecta-ble via parameter P06. The factory setting displays the current room temperature.Use parameter P04 to display the room temperature or setpoint in °F rather than°C as needed.

The acquired room temperature (internal or external sensor) is also available asinformation on the Modbus.

· With automatic changeover or continuous heating / cooling, symbols /indicate that the system currently heats or cools (heating or cooling output isactivated).

· With manual changeover (P01 = 2), symbols / indicate that the systemcurrently operates in heating or cooling mode. Thus, the symbols are displayedeven when the thermostat operates in the neutral zone.

Concurrent display of the current temperature or setpoint in °C and °F (parameterP07 = 1) is possible on the thermostats.

The outside temperature can be displayed on the room thermostat by settingparameter P07 = 2. This temperature value has only information character whichcomes from the master device in the Modbus network.

Time of day via Modbus can be displayed on the room thermostat by settingparameter P07 = 3 or 4. The display format is either in 12- or in 24-hour format.The information can be received from a master device in the Modbus network.

General note:Parameters

Temperature control

Display

Room temperature

/

Concurrent display of°C and °F

Outside temperature

Time of day

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3.2 Operating modes

The thermostat's operating mode can be influenced in different ways. e.g.operating mode button, switch over contact, Modbus, etc. Specific heating andcooling setpoints are assigned to each operating mode.

The operating mode can be selected via Modbus.

The thermostat returns the effective room operating mode on the Modbus.

The following operating modes are available:

In Comfort mode, the thermostat maintains the Comfort setpoint. This setpoint canbe defined via parameters P8, P9 and P10.

Also, it can be locally adjusted via the +/- buttons or remotely via Modbus.In Comfort mode, the fan can be set to automatic or manual fan speed: Low,medium or high.

A preset setpoint in economy mode can be defined via parameters P11 and P12.The thermostat switches to Economy mode when...

– the operating mode button is pressed (only possible if parameter P02 is set to 2)– Economy is sent via Modbus– an operating mode switchover contact (e.g. keycard contact presence detector,

window contact) is active.The contact can be connected to multifunctional input X1, X2.Set parameter P38 / P40 to 3 (P02 is irrelevant) *)

– "Window state" is sent via Modbus

*) Operating mode switchover: Only one input source must be used, either localinput X1/X2 or Modbus.User operations are ineffective and “OFF” is displayed if the operating modeswitchover contact is active, or if "Window state" is sent via Modbus.

In Protection mode, the system is...

– protected against frost (factory setting 8 °C, can be disabled or changed viaP65)

– protected against overheating (factory setting OFF, can be enabled or changedvia P66)

No other operating mode can be selected locally if Protection mode is commandedvia Modbus. is displayed.

Room operating mode:Preselection

Room

operating mode: State

Comfort

Economy

Window state

Note:

Protection

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3.2.1 Different ways to influence the operating mode

The operating mode can be influenced by different interventions. The table belowshows the priorities of different interventions. (i.e. lower number higher priority)

Priority Description Remark� Commissioning In parameter setting mode (highest priority), you can

always command an operating mode independent ofall other settings or intervention via Modbus and localinput.If P02 changed by Modbus, the operating mode willjump to Protection mode, in all cases, after theupdate.

� Operating modeswitchovercontact

If the contact is closed, the operating mode changesto Economy. This overrides the operating mode onthe thermostat.

� "Window state"via Modbus

"Window state" sent via Modbus has the same effectas the operating mode switchover contact.

Note: Only one input source must be used, either local input X1/X2 orModbus.

� Operating modevia Modbus

The operating mode can be changed via ModbusNote: Operating mode button is disabled if Protectionmode is commanded via Modbus.

� Operating modebutton

The user can switch the operating mode via theoperating mode button unless a key lock commandreceived from the Modbus before.

Note: Higher priority commands can override the lower priority’scommand. If operating mode is set via Modbus, the unit will indicate byflashing “OFF” when OpMode button pressed by users.

The operating mode can be selected locally via the operating mode button.The behavior of the operating mode button (user profile) can be defined viaparameter P02, factory setting is P02 = 1.

P02 Without timeschedule

Description

1 à · Switching manually between 2 modes, Economy isnot available (factory setting)

· Suited for hotel guest rooms or commercialbuildings.

2 à à · Switching manually between 3 modes· Suited for homes and rooms where manual

switching to Economy mode is desired

The thermostat can be forced into Economy mode (e.g. when a window is opened,when a presence detector signals "no one present", when the keycard of a hotelroom is withdrawn, etc). The contact can be connected to multifunctional input X1,X2. Set parameter P38, P40 to 3.

The function is also available via the Modbus signal "Window state",

Note: Only one input source must be used, either local input X1/X2 or Modbus.User operations are ineffective and “OFF” is displayed if the operating modeswitchover contact is active, or if "WindowContact" is sent via Modbus.

Priority of operatingmode interventions

Availability of Economymode

Operating modeswitchover contact(window contact)

Room operating mode:Window State

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3.3 Room temperature setpoint3.3.1 Description

The factory setting for the Comfort basic setpoint is 21 °C and can be changed inthe thermostat’s EEPROM via parameter P08 or via Modbus with communicationobject "Comfort basic setpoint". The last intervention always wins.

The Comfort setpoint can be adjusted via the +/- buttons,or via Modbus from a remote device like a touch panel or master unit, etc.The last intervention always wins.

If the “Temporary setpoint” function is enabled via parameter P69, the Comfortsetpoint adjusted via the + / - buttons or via Modbus is set back to the Comfortbasic setpoint stored in P08 when the operating mode changes.

For energy saving purposes, the setpoint setting range can be limited to minimum(P09) and maximum (P10).

· If the minimum limit P09 is set lower than the maximum limit P10, both heatingand cooling are adjustable between these 2 limits

· For heating or cooling applications (e.g. 2-stage):– The setting range in cooling mode is from P09…40 °C in place of 5…40 °C– The setting range in heating mode is from 5…P10 °C in place of 5…40 °C

· For heating and cooling applications (e.g. 4-pipe):– The cooling and heating setpoint are adjustable

– The setting range in cooling mode is from P09…40 °C in place of 5…40 °C – The setting range in heating mode is from 5…P10 °C in place of 5…40 °C

Examples 2-pipe heating OR cooling 4-pipe heating AND cooling

P09 < P10

Cooling setpoint adjustable 18…25 °CHeating setpoint adjustable 18…25 °C


P09 ≥ P10


Use control parameters P11 and P12 to adjust the Economy mode setpoints.The heating setpoint is factory-set to 15 °C, and the cooling setpoint to 30 °C.

Use control parameters P65 and P66 to adjust the Protection mode setpoints.The heating setpoint is factory-set to 8 °C (frost protection) and to OFF for cooling.

Comfort mode

Temporary setpoint

Setpoint limitation

P09 < P10

P09 ≥ P10

Economy mode

Protection mode

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If a setpoint (Economy or Protection) is set to OFF, the thermostat does not controlthe room temperature in the corresponding mode (heating or cooling).This means no protective heating or cooling function and thus risk of frost inheating mode or risk of over-temperature in cooling mode!

The Economy setpoints are accessible at the service level (P11, P12); theProtection setpoints at the expert level (P65, P66).

3.3.2 Setting and adjusting setpoints

Room temperature setpoints can be– set during commissioning– adjusted during runtime

The source can be via– local HMI– a Modbus commissioning tool– a Modbus master unit

The thermostat stores the setpoints– in EEPROM in the form of parameters

The table below shows the interrelations:

Setpoint setting (Stored inEEPROMof thermostat)

Current runtime setpoints inthermostat

Commissioning– HMI– Tool download– Master unitP08 Comfort basic setpointP33 Dead zone Comfort 1)

Comfort setpoint

P11 Economy HeatingP12 Economy Cooling

Economy HeatingEconomy Cooling

P65 Protection HeatingP66 Protection Cooling

Protection HeatingProtection Cooling

Setpoint adjustmentNew current runtime setpoints inthermostat

Via Modbus Localoperation

Comfort setpoint + / - buttons Comfort setpointEconomy HeatingEconomy CoolingProtection HeatingProtection Cooling

Effective room operating mode Current setpoint (used by thethermostat for temperature control)

1) Only required for heating AND cooling applications (see section 3.6.7)

The current setpoint (used by the thermostat for temperature control) is availableon the Modbus for use in the central control unit.

Caution

Room temperature:Comfort setpoint

Room temperature:Current setpoint

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· Changes via the local HMI or via tool have the same priority (last always wins)· Setting the Comfort basic setpoint will reset the runtime Comfort setpoint to the

basic setpoint

· The resulting (current) setpoint heating and cooling is limited by the Protectionsetpoint; if Protection setpoint is OFF, then minimum 5 °C and maximum 40 °Care used

· The resulting setpoints for cooling and heating of the same operating mode havea minimum distance of 0.5 K between them

3.4 Applications overview

The thermostats support the following applications, which can be configured usingthe DIP switches inside the front panel of the unit or a Modbus commissioning tool.

All DIP switches need to be set to OFF (factory setting) to select an application viacommissioning tool.

Remote configuration, via commissioning tool (factorysetting)

DIP switches

See also…· section 3.4.1 “Applications for fan coil systems”· section 3.4.2 “Applications for universal systems”· section 3.4.3 “Applications for heat pump systems”· section 3.6.5 “Error! Reference source not found.”· section 3.6.6 “Compressor applications”.

General notes:

Notes on setpointadjustment

Remote configuration

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3.4.1 Applications for fan coil systems

Application and output signal, DIP switches, diagram

· 2-pipe fan coil unit ON/OFF(heating or cooling)

1

ON

2 3

· 2-pipe fan coil unit with electricheater ON/OFF(heating or cooling) 1

ON

2 3

3076

D20

(B1)

M1

V1

TB2

T

T

(B1)V1

M1

3171

D21

TB2

E1

T(B1)

T

(B1)

· 2-pipe fan coil unit 3-position(heating or cooling)

1

ON

2 3

· 4-pipe fan coil unit ON / OFF(heating and cooling)

1

ON

2 3

3076

D20

(B1)

M1

V1

TB2

T

T

(B1)

T

V2

V1

M1

3076

D22

(B1)

T

(B1)

V1 Heating or heating / cooling valve actuator B1 Return air temperature sensor or external roomtemperature sensor (optional)

V2 Cooling valve actuator B2 Changeover sensor (optional)E1 Electric heater M1 3- or 1-speed fan

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3.4.2 Applications for universal systems


· Chilled / heated ceiling ON / OFF(heating or cooling)

1

ON

2 3

Chilled / heated ceiling with electricheater(heating or cooling) ON / OFF 1

ON

2 3

3191

S11

N1T

B1T

B2

T

D3

V1

3191

S12

N1TE1

B1T

B2

T

D3

V1

· Chilled / heated ceiling 3-position(heating or cooling)

1

ON

2 3

· Chilled ceiling and radiator ON / OFF(heating and cooling)

1

ON

2 3

3191

S11

N1T

B1T

B2

T

D3

V1

3191

S13

N1T

B1T

D3

V2

V1

V1 Heating or heating / cooling valve actuator B1 Return air temperature sensor or external roomtemperature sensor (optional)

V2 Cooling valve actuator B2 Changeover sensor (optional)E1 Electric heater D3 Dewpoint sensor

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3.4.3 Applications for heat pump systems


· 1-stage compressor ON / OFF(heating or cooling)

1

ON

2 3

· 1-stage compressor with electricheater(heating or cooling) ON / OFF 1

ON

2 3

3181

S31

N1T

B1T

D3

3181

S32

N1T

E1

B1T

D3

· 1-stage compressor ON / OFF(heating and cooling)

1

ON

2 3

3181

S35

N1T

B1T

D3

N1 ThermostatTerminal Y11: Heating or heating / coolingTerminal Y21: for cooling (H &C)

B1 Return air temperature sensor or external roomtemperature sensor (optional)

E1 Electric heater D3 Dewpoint sensor

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3.5 Additional functions

The heating / cooling changeover information can be received via Modbus. This isonly possible if the control sequence is set to automatic heating / coolingchangeover (parameter P01 = 3) and no local input X1, X2 is assigned with thisfunction.

In the absence of the required information (e.g. due to problems with datacommunication, power failure, etc.), the thermostat operates in the last valid roomoperating mode (heating or cooling).

If a cable temperature sensor (QAH11.1 + ARG86.3) is connected to X1 / X2, andparameter P38 / P40 is =2, the water temperature acquired by the changeoversensor is used to change over from heating to cooling mode, or vice versa.· When the water temperature is above 28 °C (adjustable via parameter P37),

the thermostat changes over to heating mode.It stays in heating mode until the temperature falls below 16°C (adjustable viaparameter P36)

· When the water temperature is below 16 °C (P36), the thermostat changesover to cooling mode.It stays in cooling mode until the temperature rises above 28°C (P37).

· If the water temperature is between the 2 changeover points immediately afterpower-up (inside the hysteresis), the thermostat starts in previous mode.

The water temperature is acquired at 30-second intervals and the operating state isupdated accordingly.

M Operating mode Cooling mode

Tw Water temperature Heating mode

The QAH11.1 cable temperature sensor for automatic heating / cooling changeovercan be replaced by an external switch for manual, remote changeover:

Contact openà heating modeContact closedà cooling mode

The sensor or switch can be connected to input terminal X2 or X1, depending onthe commissioning of the inputs (P38, P40).See also section 3.9 “Multifunctional input”.

· Manual heating / cooling changeover means selection via changeover button onthe thermostat by repeatedly pushing the button until the required mode isshown on the display (automatic changeover is done via an external sensor /switch connected to X1, X2, or D1)

· If manual heating / cooling changeover is commissioned (P01 = 2), then heating/ cooling mode cannot be changed via changeover sensor / switch; it will remainin the last mode as selected locally via button.

Heating / coolingchangeover viaModbus

Heating/coolingchangeover

Automatic heating /cooling changeover viachangeover sensor

Changeover switch

Manual heating /cooling changeover

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The thermostat acquires the room temperature via built-in sensor, external roomtemperature 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 3.9 “Multi-functional input”.

The changeover sensor ensures changeover from heating to cooling mode basedon the acquired water temperature. We recommend activating the “Purge” function(parameter P50) with 2-port valves. This function ensures correct acquisition of themedium temperature even if the 2-port valve is closed for an extended period oftime. The valve is then opened for 1 to 5 minutes (adjustable) at 2-hour intervalsduring off hours.

The “Purge” function (parameter P50) must be disabled if the thermostat is used incompressor-based applications.

In very warm and humid climates, the fan can be run periodically or continuously ata low fan speed (e.g. in empty apartments or shops) in Economy mode by settingparameter P61, in order to avoid damage from moisture due to lack of aircirculation. See also section 3.8 “Fan control”, under “Fan kick function”.

Limit the ON/OFF switching cycle to protect the HVAC equipment, e.g. compressorand reduce wear and tear. The minimum output on-time and off-time for 2-positioncontrol output can be adjusted from 1 to 20 minutes via parameters P48 and P49.The factory setting is 1 minute.Readjusting the setpoint or heating / cooling mode changeover immediately resultsin calculation of the output state; the outputs may not hold the minimum 1-minuteON/OFF time.If parameter P48 or P49 is set to above 1 minute, the minimum ON/OFF time forthe control output is maintained as set, even if the setpoint or changeover mode isreadjusted.

All heating sequences can also be used for floor heating.You can use fan coil unit heating / cooling sequences for floor heating or cooling bydisabling the fan via parameter P52.

The floor temperature should be limited for 2 reasons: Comfort and protection ofthe floor.

The floor temperature sensor, connected to multifunctional input X1 or X2, acquiresthe floor temperature. If the temperature exceeds the parameterized limit (parame-ter P51), the heating valve is fully closed until the floor temperature drops to a level2 K below the parameterized limit.This function is factory-set to OFF (disabled).Input X1 or X2 must be commissioned accordingly (P38 or P40 = 1).See section 3.9 “Multifunctional input”.

Living rooms: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.

External / return airtemperature sensor

Purge function

Caution

Avoid damage frommoisture

Minimum outputON-time / OFF-time

Floor heating /Floor cooling

Floor temperaturelimitation function

Recommended valuesfor P51:

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The table below shows the relation between parameter, temperature source andtemperature display:

Parameter P51 External temp.sensor available

Source for display ofroom temperature

Output controlaccording to

Floor temp.limitfunction

OFF No Built-in sensor Built-in sensor Not activeOFF Yes External temp. sensor External temp. sensor Not active10...50 ˚C No Built-in sensor Built-in sensor Not active

10…50 ˚C Yes Built-in sensor Built-in sensor + limitby external sensor Active

The “Floor temperature limitation” function influences the outputs listed in the tablebelow:

“Floor temp. limit” function has impact onoutput

Application Output Y11 Output Y21Heating

(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 à 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 tothe building.A dew point sensor with a potential-free contact is connected to multifunctionalinput X1 or X2. If there is condensation, the cooling valve is fully closed until nomore 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 allthe buttons. If “Auto lock” is configured (P14=1), the thermostat will automaticallylock all the buttons 10 seconds after the last adjustment and the way to unlock thebuttons is the same as per manual lock.

The key lock command from the Modbus has higher priority to execute. Users arenot able to change the operating mode by pressing the key button on the unit torelease 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 buttonsB = Lock operating mode button onlyC = Lock fan button onlyD = Lock temperature adjusting buttons (+ & -) only.E = Unlock

Note

Dew point monitoring

Fault stateFault information

Key lock

Key lock command

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3.6 Control sequences3.6.1 Sequences overview (setting via parameter P01)

The main control sequence (i.e. the water coil sequence of the fan coil unit) can beset via parameter P01.

The following sequences can be activated in the thermostats (each without or withauxiliary heating).

The available sequences depend on the application (selected via DIP switch, seesection 3.4).

Parameter P01 = 0 P01 = 1 P01 = 2 P01 = 3 P01 = 4

Sequence

Availablefor basicapplication 1) :ê

Heating Cooling

= heatingsequence forel. heater

Manually selectheating orcoolingsequence(using thebutton on thethermostat)

Automaticheating /coolingchangeover viaexternal watertemperaturesensor orremote switch

Heating andcoolingsequence, i.e.4-pipe

2-pipe,2-pipe & el heater ü ü ü ü

4-pipe ü 2) ü 2) ü

1) For chilled / heated ceiling and radiator applications, see section 3.6.5;for compressor applications, see section 3.6.6

2) For manual and automatic changeover with 4-pipe applications, see section3.6.4:– 4-pipe manual changeover (P01 = 2) means activating either cooling or

heating outputs– 4-pipe automatic changeover (P01 = 3) means swapping the control outputs

according to a heating / cooling sensor or remote switch ("main andsecondary" application), see section 3.6.4

For the relation between setpoints and sequences, see section 3.6.7.

Notes:

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3.6.2 2-pipe fan coil unit

On 2-pipe applications, the thermostat controls a valve in heating / cooling modewith changeover (automatically or manually), heating only, or cooling only. Coolingonly is factory-set (P01 = 1).

ON/OFF control

The diagrams below show the control sequence for 2-position control.

Heating mode Cooling mode

½ SDH

1

0½ SDH

w

Y

3076

D01

T[°C]

V1Y

½ SDC

1

0½ SDC

w

3076

D02

T[°C]

V1

T[°C] Room temperature SDH Switching differential “Heating” (P30)w Room temperature setpoint SDC Switching differential “Cooling” (P31)V1 Control command “Valve” or “Compressor”

Modulating control: 3-position

The diagrams below show the control sequence for modulating PI control.

Heating mode Cooling mode

XpH

100

0 w

Y [%]

3076

D03

T[°C]

V1

XpC

Y [%]

100

0 w

3076

D04

T[°C]

V1

T[°C] Room temperature XpH Proportional band “Heating” (P30)

w Room temperature setpoint XpC Proportional band “Cooling” (P31)V1 Control command “Valve”

The diagrams only show the PI thermostat’s proportional part.

Setting the sequence and the control outputs

Refer to sections 3.4 "Applications", 3.6.1 "Sequences", and 3.7 "Outputs".

Control sequenceON/OFF output

Control sequencemodulating output

Note:

25 / 62


3.6.3 2-pipe fan coil unit with electric heater

On 2-pipe applications with electric heater, the thermostat controls a valve inheating / cooling mode with changeover, heating only, or cooling only plus anelectric heater.Cooling only is factory-set (P01 = 1) with enabled electric heater (P13).

In cooling mode, the valve receives an OPEN command if the acquired tempera-ture is above the setpoint.The electric heater receives an ON command if the acquired room temperaturedrops below “setpoint” minus “dead zone” (= setpoint for electric heater) while theelectric heater is enabled (parameter P13 = ON).

Note: “Setpoint for electric heater” is limited by parameter “Maximum setpoint forComfort mode” (P10).

In heating mode, the valve receives an OPEN command if the acquired tempera-ture is below the setpoint. The electric heater is used as an additional heatingsource when the heating energy controlled by the valve is insufficient.The electric heater receives an ON command, if the temperature is below “setpoint”minus “setpoint differential” (= setpoint for electric heater).

The electric heater is active in heating mode only and the control output for thevalve is permanently disabled when manual changeover is selected (P01 = 2).

Remote enabling / disabling of the electric heater is possible via input X1 or X2 fortariff regulations, energy savings, etc.Input X1 or X2 must be commissioned accordingly (parameters P38, P40). Seesection 3.9 “Multifunctional input”.

The electric heater can also be enabled / disabled via Modbus.

If “Enable electric heater” input is used via Modbus, then the function must not beassigned to a local input X1 or X2.

An electric heater must always be protected by a safety limit thermostat!

Heating or cooling withauxiliary heater

Electric heating, active incooling mode

Electric heating inheating mode

Electric heating andmanual changeover

Digital input “Enableelectric heater”

Enable electric heater

Note:

Caution

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ON/OFF control

The diagrams below show the control sequence for 2-position.

Heating mode(automatic changeover = heating or heating only)

Cooling mode(man. / auto. changeover = cooling or cooling only)

Y

½ SDH

1

0½ SDH

w

3076

D06

T[°C]

V1

½ SDH ½ SDH

E1wD

Y

½ SDC

1

0½ SDC

w

3076

D05

T[°C]

V1

½ SDH ½ SDH

E1xdz

Heating mode with manual changeover (P01 = 2) (manual changeover = heating)

½ SDH

1

0½ SDH

w

Y

3076

D07

T[°C]

E1T[°C] Room temperatureW Room temperature setpointV1 Control command “Valve” or “Compressor”E1 Control command “Electric heater”SDH Switching differential “Heating” (P30)SDC Switching differential “Cooling” (P31)Xdz Dead zone (P33)wD Setpoint differential (P34)




Control sequenceON/OFF output

Note:

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3.6.4 4-pipe fan coil unit

On 4-pipe applications, the thermostat controls 2 valves in heating and coolingmode, heating / cooling mode by manual selection, or heating and cooling modewith changeover. Heating and cooling mode (P01 = 4) is factory-set.

The heating or cooling output can be released via operating mode button ifparameter P01 is set to Manual (P01 = 2).

If parameter P01 is set to changeover (P01 = 3), the heating and cooling output isswapped according to the input state of the changeover sensor / switch / viaMODBUS input (see automatic heating and cooling changeover sensor in section3.5). This mode is used for the so-called “Main and secondary” application. This isa 4-pipe fan coil unit system with different capacities of the 2 coils. The water circuitis changed to optimize the energy exchange depending on the season (summer /winter):– Winter: Large coil (V1) for heating, small coil (V2) for cooling– Summer: Large coil (V1) for cooling, small coil (V2) for heating

TB1

V2

V1

M1

3181

D11

2

T B2 Note:This example showsON/OFF control;for modulating con-trol, connect theappropriate outputterminals

· The parameter for the heating and cooling changeover sensor (B2 in the abovediagram) must be set to 2 (X1 or X2, P38 or P40)

· The thermostat assumes winter operation when B2 > P37 (factory setting 28 °C)· The thermostat assumes summer operation when B2 < P36 (factory setting 16 °C)

Heating and cooling

4-pipe application withmanual changeover

"Main and secondary"application (4-pipe withchangeover)

Notes:

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The diagrams below show the control sequence for 2-position control.

Heating mode with manual selection(P01=2) orfor P09 >= P10 in heating sequence *)

Cooling mode with manual selection(P01=2) orfor P09 >= P10 in cooling sequence *)

Y

½ SDC

1

0½ SDC

w

3076

D13

T[°C]

V2

Heating and cooling mode (P01 = 04)

Y

½ SDC

1

0½ SDC

w

3076

D11

T[°C]

V2

½ SDH ½ SDH

V1½xdz ½xdz

T[°C] Room temperature

w Room temperature setpoint

V1 Control command “Valve” or “Comp.” (H)

V2 Control command “Valve” or “Comp.” (C)

SDH Switching differential “Heating” (P30)

SDC Switching differential “Cooling” (P31)

Xdz Dead zone (P33)




ON/OFF control

Note:

½ SDH

1

0½ SDH

w

Y 3076D01

T[°C]

V1

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3.6.5 Chilled / heated ceiling and radiator applications

For chilled / heated ceiling and radiator,· set the corresponding basic application· disable the fan (P52)

The following applications are available:

Application forchilled / heated ceiling, radiator

Set basic application Seesection

Sequences

Chilled / heated ceiling withchangeover

2-pipe 3.6.2 H ( \ )C ( / )

Chilled / heated ceiling & el heater(cooling only: disable el heater viaP13)

2-pipe and electric heater 3.6.3 El H + H ( 7 \ \ )El H + C ( 7 \ / )C ( / )

Chilled ceiling and radiator 4-pipe 3.6.4 H + C ( \ / )

3.6.6 Compressor applications

For compressor applications,· set the corresponding basic application· disable the fan (P52) or set the fan speed (P53)

The following applications are available:

Application for compressor Set basic application Seesection

Sequences

1-stage compressorfor heating or cooling

2-pipe 3.6.2 H ( \ )C ( / )

1-stage compressor and electricheater(for cooling only: disable electricheater via P13)

2-pipe and electric heater 3.6.3 El H + H ( 7 \ \ )El H + C ( 7 \ / )C ( / )

1-stage compressorfor heating and cooling

4-pipe 3.6.4 H + C ( \ / )

· Minimum ON/OFF time: P48 / P49· Fan operation: P52 (0 = disabled, 1 = enabled)· Fan speed: P53 (1 = 1-speed, 2 = 3-speed)

Notes:

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3.6.7 Setpoints and sequences

On changeover applications, the Comfort setpoints for heating and coolingsequence are the same (w).

On 2-pipe applications with electric heater, the Comfort setpoint is either at the firstheating sequence (in heating mode) or at the cooling sequence (in cooling mode).

The setpoints for Economy and Protection mode are below the Comfort setpoints(heating) and above the Comfort setpoints (cooling).They can be set via parameters P11, P12 (Economy mode) and P65, P66(Protection mode).

Comfort mode Economy / Protection modeApplication Heating Cooling Heating Cooling

2-pipe

2-pipe andelectric heater

1) If P13 = ON2) In case of manual changeover (P01 = 2), the first heating sequence is disabled to prevent heating

(electric heater) and cooling (coil) at he same time

W = setpoint in Comfort modeWHeatEco/Prot = setpoint heating in Economy or Protection modeWCoolEco/Prot = setpoint cooling in Economy or Protection mode

YR = radiator sequenceE1 = electric heater sequence

2-pipe applications

Y

TWHeatEco/Prot WCoolEco/Prot

E1 1)Y

TWHeatEco/Prot

E1 2)Y

TW

E1 1)

Y

TW

E1 2)

Y

TWCoolEco/Prot

Y

TWHeatEco/Prot

Y

TW

Y

TW

31 / 62


On 4-pipe applications, the Comfort setpoint (w) is in the middle of the dead zone,between the heating and cooling sequence.

The dead zone can be adjusted via parameter P33.

If manual changeover is selected, then either the cooling sequence or the heatingsequence is released. In this case, the Comfort setpoint is at the selected heatingor cooling sequence.

Comfort mode Economy /Protection mode

Application Heating and cooling Heating only 1) Cooling only 1) Heating and/orcooling

4-pipe

1) Manual changeover, P01 = 2

W = setpoint in Comfort mode

WHeatEco/Prot = heating setpoint for Economy or Protection modeWCoolEco/Prot = cooling setpoint for Economy or Protection modeYE = electric heater sequence

4-pipe applications

Y

TWHeatEco/Prot WCoolEco/Prot

Y

TW

Y

TW

Y

TW

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3.7 Control outputs3.7.1 Overview

Different control output signals are available. They need to be defined duringcommissioning (see below).

Control output

Product no.

2-position 3-position

RDF302 Y11, Y21(2 x SPST)

Y11, Y21 *)(1 x / )

*) Only on 2-pipe application

The valve or compressor receives the OPEN/ON command via control output Y11or Y21 when…1. the acquired room temperature is below the setpoint (heating mode) or above

the setpoint (cooling mode).2. the control outputs have been inactive for more than the “Minimum output

OFF-time” (factory setting 1 minute, adjustable via parameter P48).

OFF command when…1. the acquired room temperature is above the setpoint (heating mode) or below

the setpoint (cooling mode).2. the valve has been active for more than the “Minimum output on-time” (factory

setting 1 minute, adjustable via parameter P49).

The electric heater receives an ON command via the auxiliary heating controloutput (Y…, see Mounting Instructions) when…1. the acquired room temperature is below the “Setpoint for electric heater”2. the electric heater has been switched off for at least 1 minute

The OFF command for the electric heater is output when…

1. the acquired room temperature is above the setpoint (electric heater)2. the electric heater has been switched on for at least 1 minute

A safety limit thermostat (to prevent over-temperatures) must be providedexternally.

When an electric heater is connected directly to the ON/OFF Y21, the currentcauses the relay contact to heat up. This falsifies the reading of the internaltemperature sensor. The thermostat compensates the temperature if the ratedcurrent/power of the electric heating is entered in the parametersP46 (load current electric heater): factory setting: 0 A, setting range: 0.0…5.0 A.

Output Y11 provides the OPEN command, and Y21 the CLOSE command to the 3-position actuator.The factory setting for the actuator's running time is 150 seconds. It can beadjusted via parameter P44.The parameter is only visible if 3-position is selected via DIP switches.

Overview of controloutputs

ON/OFF control signal(2-position)

Electric heater controlsignal(2-position)

Caution

Adaptive temperaturecompensation forelectric heater

3-positioncontrol signal

33 / 62


1. When the thermostat is powered up, a closing command for the actuatorrunning time + 150% is provided to ensure that the actuator fully closes andsynchronizes to the control algorithm.

2. When the thermostat calculates the positions "fully close" or "fully open", theactuator's running time is extended + 150% to ensure the right actuatorposition is synchronized to the control algorithm.

3. After the actuator reaches the position calculated by the thermostat, a waitingtime of 30 seconds is applied to stabilize the outputs.

3.7.2 Control outputs configuration (setting via DIPswitches or Modbus commissioning tool)

For the control outputs of a 2-pipe application, either On/Off or 3-position can beset via DIP switches or via Modbus commissioning tool (see section 3.4). Otherapplications, e.g. 4-pipe and 2-pipe with electric heater, only have On/Off type ofoutputs.

The application and control output can be changed between On/Off and 3-positionvia Modbus.

Synchronization

Plant type

34 / 62


3.8 Fan control

The fan operates in automatic mode or at the selected speed with manual mode.In automatic mode, the fan speed depends on the setpoint and the current roomtemperature. When the room temperature reaches the setpoint, the control valvecloses and the fan switches off or stays at fan speed 1 (parameter P60; factorysetting: 0 = fan speed 1 in dead zone).Only one fan output at a time is on, either Q1, Q2 or Q3.

The fan speed and mode can be changed via Modbus.

The fan speed and mode can be monitored via Modbus.

The individual switching points for ON of each fan stage can be adjusted viacontrol parameters P55…P57. The fan speed switch off point is 20% below theswitch on point. The diagrams below show fan speed control for modulating PIcontrol.

wXpH YC[%]

Q

Q3

Q2

Q1

YH[%]0 0

XpC100 100

xdz

w Room temperature setpointQ Fan speedYH Control demand “Heating”YC Control demand “Cooling”XpH Proportional band “Heating”XpC Proportional band “Cooling”Xdz Dead zone

The diagram only shows the PI thermostat’s proportional part.

On applications with 2-position control:1) The switching point for low fan speed (Q1) is synchronized to the heating /

cooling output. Parameter “Switching point fan speed low” P57 is not relevant.2) The maximum switching range of the fan (XpHFan / XpCFan) is defined by the

switching differential (SDH/SDC) via a look-up table.

T[°C] Room temperaturew Room temperature setpointQ Fan speedY Control command “Valve”SDH Switching differential “Heating”SDC Switching differential “Cooling”Xdz Dead zoneXpHFan Switching range for fan “Heating”

XpCFan Switching range for fan “Cooling”

SDH/SDC [K] 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 >4.5XpHFan/XpCFan [K] 2 3 4 5 6 7 8 9 10

Fan command value

Fan operationFan output

3-speed fan controlwith modulatingheating / coolingcontrol

Note:

3-speed fan controlwith ON/OFF heating /cooling control

Look-up table withON/OFF control

35 / 62


The thermostat can control a 1- or 3-speed fan (selected via control parameterP53). A 1-speed fan is connected to terminal Q1, a 3-speed fan to terminals Q1,Q2 and Q3.

Fan operation can be limited to be active with cooling only or heating only, or evenbe totally disabled via control parameter “Fan control” P52.When fan operation is disabled, the fan symbol on the display disappears andpressing the fan button has no impact.This function allows you to use the thermostat on universal applications such aschilled / heated ceilings and radiator, etc. (see section 3.6.5).

In automatic mode, a dwelling time of 2 minutes (factory setting) is active. The fanmaintains each speed for at least 2 minutes before it changes to the next speed.This minimum on-time can be adjusted from 1…6 minutes via parameter P59.

In automatic fan mode and with the room temperature in the dead zone, the controlvalve is normally closed and the fan disabled. With the “Fan kick” function, the fancan be released from time to time at low speed for minimum on-time (see above)even if the valve is closed.

This function can be used to avoid damage from moisture due to a lack of air circu-lation, or to allow a return air temperature sensor to acquire the correct roomtemperature.

Y

t [h:mm]

Q1

0

10385D22en

Periodic fan kick Minimumon-time

Periodic fan kick Minimumon-time

The periodic fan kick time can be selected individually for Comfort mode viaparameter P60, and for Economy mode via parameter P61.Note: Fan kick value “0” means the fan runs continuously in the dead zone.

Fan kick value “OFF” means the fan does not run in the dead zone.

When the fan starts from standstill, it starts at speed 3 for 1 second to ensure safefan motor start by overcoming inertia and friction (selected via parameter P58).

Q

Q3

Q2

Q1

0T

1 sec

3181

D22

1-speed / 3-speed fan

Fan operation as perheating / cooling mode,or disabled

Fan minimumon- time

Fan operation in deadzone (fan kick)

Fan start

36 / 62


When the electric heater is switched off, the fan overruns for 60 seconds(parameter P54) to avoid over-temperature of the electric heater or prevent thethermal cutout from responding.

In case of fan failure, the thermostat cannot protect the electric heater againstover-temperature. For this reason, the electric heater must feature a separatesafety device (thermal cutout).

The “Clean fan filter reminder” function counts the fan operating hours and displaysmessage “FIL “ to remind the user to change / clean the fan filter as soon as thethreshold is reached. This does not impact the thermostat's operation, whichcontinues to run normally. This function can be set via parameter P62 (Service Filter).

The “Clean fan filter reminder” is reset when the operating mode is manually set toProtection and back.

The ‘Clean fan filter reminder’ and error information (see 3.11.1) can be obtainedvia Modbus object: Fault information

Fan overrun for electricheater

Fan failure

Clean fan filterreminder

Fault information

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3.9 Multifunctional input, digital input

The thermostat has 2 multifunctional inputs X1 and X2An NTC type sensor like the QAH11.1 (AI, analog input) or a switch (DI, digitalinput) can be connected to the input terminals. The functionality of the inputs canbe configured via parameters P38 + P39 for X1 and P40 + P41 for X2.

The current temperature or state of the inputs X1/X2 is available on Modbus formonitoring purposes.

The parameters can be set to the following values:

# Function of input Description TypeX1/X2

0 Not used No function. --1 External / return air

temperatureSensor input for external room temperaturesensor or return air temperature sensor toacquire the current room temperature, or floorheating temperature sensor to limit the heatingoutput.Note: The room temperature is acquired by thebuilt-in sensor if the floor temperature limitationfunction is enabled via parameter P51.

AI

2 Heating / coolingchangeover

Sensor input for “Automatic heating / coolingchangeover” function.A switch can also be connected rather than asensor (switch closed = cooling, see section3.5).

Heating / cooling changeover is also possiblevia Modbus. In this case, the function must notbe assigned to any local input X1, X2. See alsosection 3.5.

Diagnostic value 0 ˚C is displayed for closedcontact / 100 ˚C for open contact, if a switch isconnected.

AI / DI

3 Operating modeswitchover

Digital input to switch over the operating modeto Economy.If the operating mode switchover contact isactive, user operations are ineffective and“OFF” is displayed.

Operating mode switchover is also possible viaModbus. In this case, the function must not beassigned to any local input X1, X2. See alsosection 3.2.

DI

4 Dew point monitor Digital input for a dew point sensor to detectcondensation. Cooling is stopped ifcondensation occurs.

DI

X1 inputX2 input

Heating / coolingchangeover

Window state

38 / 62


# Function of input Description TypeX1/X2

5 Enable electricheater

Digital input to enable / disable the electricheater via remote control.

Enable electric heater is also possible viaModbus. In this case, the function must not beassigned to any local input X1, X2. See alsosection 3.6.

DI

6 Fault Digital input to signal an external fault(example: dirty air filter).If the input is active, “ALx” is displayed and afault is sent on the Modbus. See also section3.11.1.(Alarm x, with x = 1 for X1, x = 2 for X2).Note: Fault displays have no impact on thethermostat's operation. They merely representa visual signal.

DI

7 Monitor input(Digital)

Digital input to monitor the state of an externalswitch via Modbus.

DI

8 Monitor input(Temperature)

Sensor input to monitor the state of an externalsensor (e.g. QAH11.1) via Modbus.

AI

· Operational action can be changed between normally open (NO) and normallyclosed (NC) via parameter P39, P41

· Each input X1 or X2 must be configured with a different function (1…5).Exception: 1 or 2 inputs can be configured as fault (6) or monitor input (7,8)

· X1 is factory-set to “Operating mode switchover” (3), X2 to “External sensor” (1)

If a multifunctional input is configured as analog: "Err" will be displayed when theoutput is out of range (0...49 °C), open or shorted.

For more detailed information, refer to section 3.4 “Applications”.

· For inputs X1 and X2, one physical switch can be used for up to 20 thermostats(parallel connection).

· For sensors on inputs X1, X2, or D1, the cable length is max. 80 m.

Enable electric heater

Fault information

X1 input, X2 input

X1 input, X2 input

Installation notes:

39 / 62


3.10 Handling faults

When the room temperature is outside the measuring range, i.e. above 49 °C orbelow 0 °C, the limiting temperatures blink, e.g. “0 °C” or “49 °C”.In addition, the heating output is activated if the current setpoint is not set to “OFF”,the thermostat is in heating mode and the temperature is below 0 °C.For all other cases, no output is activated.

The thermostat resumes Comfort mode after the temperature returns to within themeasuring range.

For fault status messages on the Modbus, see section 3.11.1.

Temperature outof range

Fault information

40 / 62


3.11 Modbus RTU mode

The RDF302 thermostats support communication protocol (Modbus RTU mode) asper the Modbus specification (refer to: http://www.modbus.org).

The device address range is from 1 to 247.The device address can be changed via parameter P81. (factory setting = 1)

The available baud rates are 4800 bps, 9600 bps, 19200bps and 38400 bps.The baud rate can be changed via parameter P68. (factory setting = 19200 bps)

The parity can be set to none (no parity), odd or even.The parity can be changed via parameter P70. (factory setting = even)

Any change, e.g. device address, baud rate and parity, will become effective onlyafter turning the power supply off then on again.

3.11.1 Fault function on Modbus

If a fault occurs (e.g. digital fault input, dew point, etc.) then a fault will be displayedon the thermostat and the fault information can be read via Modbus.

If more than one alarms occur at the same time, the alarm with the highest prioritywill be available via Modbus while the thermostat will display all active alarmsalternatively.

The table below shows the error code and default alarm texts.

Thermostat Fault information on ModbusPriority Fault Display Default fault text- No fault --- No fault1 Condensation Condensation in the room

2 External faultinput X1

AL1 Fault input 1

3 External faultinput X2

AL2 Fault input 2

4 Clean filterreminder

FIL Dirty filter

Default alarm texts are stored in the thermostat’s non-volatile memory and can beadjusted using the Modbus commissioning tool.

Device address

Baud rate

Parity

Note

Fault information

Priority of alarms


41 / 62


3.12 Communication objects3.12.1 Overview

Object # and name Thermostat Object # and name

1 System time 2 Room operating mode:State

18 Outside temperature 4 Room temperature

15 Room operating mode: Preselection

5 Room temperature:Current setpoint

19 Room operating mode: Window state

12 Fan operation(0 = Auto / 1 = Manual)

22 Key lock command 3 Fan output

17 Room temperature:Comfort setpoint

16 Fan command valueRDF302

20 Enable electric heater 6 Heating output8 Electric heater output

21 Heating/cooling changeover 1) 7 Cooling output

23 Plant type 2) 10/13 X1 input (temperature / digital)11/14 X2 input (temperature / digital)

24-27 Alarm descriptions9 Fault information

28-77 Control parameters

Output communication objectInput & output communication objectConfiguration & commissioning communication object

1) P01 must be set to 3, the manual heating/cooling changeoverEither using local input, X1/X2 input, or Modbus command

2) Dip switch position 1 to 3 must be set to OFF-OFF-OFF

42 / 62


3.12.2 Description of communication objects

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1 SystemClock 40600 4 R/W 0x03 0x10 - YYYY 1900...2155 = YearMM 1...12 = MonthDD 1...31 = Day of Monthd 0, 1…7 =Any,Mon…Sunhh 0...23 = Hoursmm 0...59 = Minutesss 0...59 = Seconds- - - Status bits

2 HVACModeUserEff 31001 1 RO 0x04 - 1 - Comfort 1=Comfort,3=Economy,4=Protection,

3 FanSpeedSetp 31002 1 RO 0x04 - 1 - 0 0 = Fan off33 = Low Fan66 = Mid Fan100 = High Fan

4 TempRoom 31003 1 RO 0x04 - 1 x50 0 ... 49 °C,0xffff=Out of services

5 TempRoomSetpUserEff

31004 1 RO 0x04 - 1 x50 5 ... 40 °C, 4=OFF

6 HeatingOutput1 31005 1 RO 0x04 - 1 - 0 [0…100]

7 CoolingOutput1 31006 1 RO 0x04 - 1 - 0 [0…100]

8 For Elect-Heatoutput

31007 1 RO 0x04 - 1 - 0 [0…100]

9 AlarmText 31100 10 RO 0x04 - - - len <= 20

10 UniversalInput1_Temp

31008 1 RO 0x04 - 1 x50 - 0 ... 49 °C0xffff = Out of services

11 UniversalInput2_Temp

31009 1 RO 0x04 - 1 x50 - 0 ... 49 °C0xffff = Out of services

12 FanStatus 31010 1 RO 0x04 - 1 - 0 0 = Automatic1 = Manual

13 UniversalInput1_DI 31011 1 RO 0x04 - 1 - OFF 0 = OFF1 = ON

14 UniversalInput2_DI 31012 1 RO 0x04 - 1 - OFF 0 = OFF1 = ON

15 EnergyDemAH 31013 1 RO 0x04 - 1 - 00,20 Demand (1byte):0~100

ContrMode (1byte):1 = Heat3 = Cool9 = Fan only20 = NoDem

16 EnergyDemAC 31014 1 RO 0x04 - 1 - 00,20 Demand (1byte):0~100

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ContrMode (1byte):1 = Heat3 = Cool9 = Fan only20 = NoDem

17 HVACModeUser 40101 1 R/W 0x03 0x06 2 - Comfort 1=Comfort,3=Economy,4=Protection,

18 FanSpeedUser 40102 1 R/W 0x03 0x06 2 - 0 0 = Auto33 = Low Fan66 = Mid Fan100 = High Fan

19 TempRoomSetpUserAbs

40103 1 R/W 0x03 0x06 2 x50 5 ... 40 °C

20 TempOutside 40104 1 R/W 0x03 0x06 2 x50 0 ... 49 °C

21 WindowContact 40105 1 R/W 0x03 0x06 2 - Close 0 = Close (default)1 = Open

22 EnableEHeat 40106 1 R/W 0x03 0x06 2 - Enable 0 = Disable1 = Enable

23 HeatCoolMode 40107 1 R/W 0x03 0x06 2 - heating 0 = cooling,1 = heating

24 KeyLock 40108 1 R/W 0x03 0x06 2 - Unlock 4 = Lock all buttons3 = Lock operating buttononly2 = Lock fan button only1 = Lock buttons (+ & -)only.0 = Unlock

25 ApplicationMode 40109 1 R/W 0x03 0x06 2 - NONE 0=NONE1=2P2=2P3P3=2PEL4=4P

26

Ala

rm

AlarmInfo1 40200 10 R/W 0x03 0x10 - Condensationin room

len <= 20

27 AlarmInfo2 40300 10 R/W 0x03 0x10 - Fault input 1 len <= 20

28 AlarmInfo3 40400 10 R/W 0x03 0x10 - Fault input 2 len <= 20

29 AlarmInfo4 40500 10 R/W 0x03 0x10 - Filter dirty len <= 20

30

Para

met

erta

ble P01 40001 1 R/W 0x03 0x06 - - When 2-pipe

1:= Coolingonly

When 4-pipe4:= Automatic

0:= Heating only1:= Cooling only2:= H/C changeover manual3:= H/C changeover auto4:= Heating and Cooling

31 P02 40002 1 R/W 0x03 0x06 - - 1 Communication unit / timeprog unit:1:= Comf - Protection2:= Comf - Eco - Prot

32 P04 40004 1 R/W 0x03 0x06 3 - °C (0) °C := Degrees Celsius°F := Degrees Fahrenheit

33 P05 40005 1 R/W 0x03 0x06 3 x50 0 K – 3 ... 3 K

34 P06 40006 1 R/W 0x03 0x06 3 - 0 0:= Room Temperature1:= Setpoint

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35 P07 40007 1 R/W 0x03 0x06 3 - 0 0:= --- (No display)1:= °C and °F2:= Outside temperature [viabus]3:= Time of day (12h) [viabus]4:= Time of day (24h) [viabus]

36 P08 40008 1 R/W 0x03 0x06 3 x50 21 °C 5 ... 40 °C

37 P09 40009 1 R/W 0x03 0x06 3 x50 5 °C 5 ... 40 °C

38 P10 40010 1 R/W 0x03 0x06 3 x50 35 °C 5 ... 40 °C

39 P11 40011 1 R/W 0x03 0x06 3 x50 15 °C OFF(=4.5), 5 ~WcoolEco;WcoolEco=40 °C max

40 P12 40012 1 R/W 0x03 0x06 3 x50 30 °C WHeatEco ... 40°C,OFF(=40.5);WHeatEco=5C min

41 P13 40013 1 R/W 0x03 0x06 3 - ON 1=ON: Enabled0=OFF: Disabled

43 P14 40014 1 R/W 0x03 0x06 3 - 0 0= Unlocked1= Auto locked2= Manual locked

58 P30 40030 1 R/W 0x03 0x06 4 x50 2 K 0.5 … 6 K

59 P31 40031 1 R/W 0x03 0x06 4 x50 1 K 0.5 … 6 K

61 P33 40033 1 R/W 0x03 0x06 4 x50 2 K 0.5 … 5 K

62 P34 40034 1 R/W 0x03 0x06 4 x50 2 K 0.5 … 5 K

63 P35 40035 1 R/W 0x03 0x06 4 - 5 min 0…10 min

64 P36 40036 1 R/W 0x03 0x06 4 x50 16 °C 10…25 °C

65 P37 40037 1 R/W 0x03 0x06 4 x50 28 °C 27…40 °C

66 P38/P40 40038 1 R/W 0x03 0x06 - - X1 = 3,X2 = 1

X1(1byte HIGH), X2(1byteLOW)0:= --- (no function)1:= Room temp ext / Returntemp (AI)2:= H/C changeover (AI/DI)3:= Operating mode contact[DI)4:= Dew point sen. (DI)5:= Enable electro heater(DI)6:= Fault input (DI)7:= Monitor input [Digital]8:= Monitor input [Temp]

67 P39 40040 1 R/W 0x03 0x06 4 - 0 (N.O.) 0:= Normally open / Open1:= Normally closed / Close

68 P41 40041 1 R/W 0x03 0x06 4 - 0 (N.O.) 0:= Normally open / Open1:= Normally closed / Close

69 P44 40044 1 R/W 0x03 0x06 - - 150 s 20…300 sec

71 P46 40182 1 R/W 0x03 0x06 - x10 0 0.0~5.0

73 P48 40048 1 R/W 0x03 0x06 6 - 1 min. 1...20 minutes

74 P49 40049 1 R/W 0x03 0x06 6 - 1 min. 1...20 minutes

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75 P50 40050 1 R/W 0x03 0x06 6 - OFF 0 = OFF: Not active1…5 min: Active withselected duration

76 P51 40051 1 R/W 0x03 0x06 6 x50 OFF 9=OFF, 10..50 °C

77 P52 40052 1 R/W 0x03 0x06 6 - 1 0:= Disabled1:= Enabled2:= Heating only3:= Cooling only

78 P53 40053 1 R/W 0x03 0x06 6 - 3-speed 1:= 1-speed2:= 3-speed

79 P54 40054 1 R/W 0x03 0x06 6 - 60 sec 0 ... 360 sec

80 P55 40055 1 R/W 0x03 0x06 6 - 100% 80..100%

81 P56 40056 1 R/W 0x03 0x06 6 - 65% 30..75%

82 P57 40057 1 R/W 0x03 0x06 6 - 10% 1..15%

83 P58 40058 1 R/W 0x03 0x06 6 - ON 1 = ON: enabled0 = OFF: disabled

84 P59 40059 1 R/W 0x03 0x06 6 - 2 min 1 ... 6 min

85 P60 40060 1 R/W 0x03 0x06 6 - 0 0…89min, OFF(90)

86 P61 40061 1 R/W 0x03 0x06 6 - OFF 0…359min, OFF(360)

87 P62 40062 1 R/W 0x03 0x06 6 - Off (0) 0 = Off, 100 … 9900 hours

90 P65 40065 1 R/W 0x03 0x06 - x50 8 °C OFF(=4.5), 5 ~WcoolEco;WcoolEco=40 °C max

91 P66 40066 1 R/W 0x03 0x06 - x50 OFF WHeatEco ... 40°C,OFF(=40.5);WHeatEco=5C min

92 P68 40068 1 R/W 0x03 0x06 8 - 2 = 19200bps 0 = 4800bps,1 = 9600bps,2 = 19200bps,3 = 38400bps

93 P69 40069 1 R/W 0x03 0x06 8 - OFF 0 = OFF := Disabled1 = ON := Enable

94 P70 40070 1 R/W 0x03 0x06 8 - Even 0 = Odd1 = Even2 = No parity

95 P71 40071 1 R/W 0x03 0x06 8 - OFF 0 = OFF := Disable1 = ON := Reload start

96 P81 40081 1 R/W 0x03 0x06 - 1 1…247

46 / 62


Format: 8 octets

8MSB 7 6 5 4

YYYYYYYY 0000 MMMM 000 DDDDD ddd hhhhh 00 mmmmmm

3 2 1LSB

00 ssssss F, WD, NWD, NY, ND, NDoW, NT, SUTI CLQ,0000000

Encoding: See below

Range: See below

Unit: See below

Datapoint TypeID: Name: Encoding: Range: Unit: Usage:19.001

DP

T_D

ate&

Tim

e

Y Binary, offset 19000 = 1900

255 = 2155

[0…255] Year General

M Binary 1 = January12 = December

[1…12] Month

D Binary 1 = 1st day31 = 31st day

[1…31] Day of month

ddd 1 = Monday… 7 = Sunday

0 = any day

[0…7] Day of week

hhhhh Binary [0…24] Hour of daymmmmmm Binary [0…59] Minutesssssss Binary [0…59] SecondsF 0 : Normal (No fault)

1 : Fault{0,1} Fault

WD 0 : Bank day (No working day)1 : Working day

{0,1} Working Day

NWD 0 : WD field valid1 : WD field not valid

{0,1} No WD

NY 0 : Year field valid1 : Year field not valid

{0,1} No Year

ND 0 : Month and Day of Month fieldsvalid

1 : Month and Day of Month fieldsnot valid

{0,1} No Date

NDoW 0 : Day of week field valid1 : Day of week field not valid

{0,1} No Day ofWeek

NT 0 : Hour of day, Minutes andSeconds fields valid

1 : Hour of day, Minutes andSeconds fields not valid

{0,1} No Time

SUTI 0 : Time = UT+X1 : Time = UT+X+1

{0,1} StandardSummer Time

CLQ 0 : clock without ext. sync signal1 : clock with ext. sync signal

{0,1} Quality ofClock

System clock format

47 / 62


3.13 Control parameters

A number of control parameters can be readjusted to optimize control performance.This can be done on the thermostat via HMI or via commissioning / operating tool.These parameters can also be set during operation without opening the unit.In the event of a power failure, all control parameter settings are retained.

The control parameters are assigned to 2 levels:· “Service level”, and· “Expert level” including communications, diagnostics and test

The “Service level” contains a small set of parameters to set up the thermostat forthe HVAC system and to adjust the user interface. These parameters can beadjusted any time.Change parameters at the “Expert level” carefully, as they impact the thermostat’scontrol performance and functionality.

3.13.1 Parameter setting via local HMI

1. Press buttons + and – simultaneously for 3 seconds. Release and pressbutton + again for 3 seconds within 2 seconds. The display shows“P01”. Continue with step 2.

1. Press buttons + and – simultaneously for 3 seconds. Release and press button– again for 3 seconds within 2 seconds. The display shows “P01” and service.

2. Repeatedly press the + or – button to select the required parameter.P01 P02 P08 P14

+- +- -+

3171z99End

-+-P13

+-

3. Press + and – simultaneously. The current value of the selected parameterbegins to flash, allowing you to change the value by repeatedly pressing + or –.

4. The next parameter is displayed when you press + and – again simultaneously.5. Repeat steps 2 to 4 to display and change additional parameters.6. Press + or – until “End” is displayed, and then press + and – simultaneously to

save the change and exit parameter entry mode.

The factory setting for the control parameters can be reloaded via parameter P71,by changing the value to “ON”, and confirming by pressing buttons + and –simultaneously. The display shows “8888” during reload.

3.13.2 Parameter setting / download via Modbuscommunication tool

Control parameters can be adjusted via Modbus either by local HMI or Modbuscommissioning tools.

Please refer to section 4.2 for commissioning.

Enter only “Service”level

Enter “Service” and“Expert” level.

Adjust parameters

Reset parameters

48 / 62


3.13.3 Parameters of the “Service level”

Para

met

er

Name Factory setting Range

Service level

P01 Control sequence

2-pipe: [0…3]1 (Cooling only)4-pipe: [2…4]4 (Heating & Cooling)

0 = Heating only1 = Cooling only2 = Manual Heating or Cooling3 = Auto Changeover4 = Heating & cooling

P02Mode selection by user viaoperating mode button 1 (Comfort, Protection)

1 = Comfort, Protection2 = Comfort, Economy,

Protection

P04 Selection of °C or °F °C0 = °C1 = °F

P05Sensor calibration (build insensor only) 0.0 °C -3…3 °C

P06 Standard temperature display 0 (Room temperature)0 = Room temperature1 = Setpoint

P07 Additional user information 0 (No display)

0 = No display1 = Temperature in °C/°F2 = Outside temperature

(via Modbus)3 = Time of day (12 h, via Modbus)4 = Time of day (24 h, via Modbus)

P08 Comfort basic setpoint 21 °C 5…40 °C

P09Minimum setpoint limitation inComfort (WminComf) 5 °C 5...40 °C

P10Maximum setpoint limitation inComfort (WmaxComf) 35 °C 5...40 °C

P11Setpoint of heating inEconomy (WheatEco) 15 °C OFF, 5 °C…WcoolEco

P12Setpoint of cooling inEconomy (WcoolEco) 30 °C OFF, WheatEco…40 °C

P13 *Electrical heater in coolingmode ON

OFF = disabledON = enabled

P14

Key lock(Press operating mode button

for 5 seconds to lock orunlock the buttons) 0 (Disabled)

0 = Disabled1 = Auto lock2 = Manual lock

*) Parameter P13 is only displayed for application "2-pipe with electric heater". All temperature settings are in increments of 0.5 °C.

Note:

49 / 62


3.13.4 Parameters of the "Expert level withdiagnostics and test"

Para

met

er

Name Factorysetting

Range

Expert level

P30P-band/Switching differential forheating mode 2 K 0.5 … 6 K

P31P-band/Switching differential forcooling mode 1 K 0.5 … 6 K

P33 Dead zone in Comfort mode 2 K 0.5 … 5 KP34 Setpoint differential 2 K 0.5 … 5 KP35** Integral time 5 min 0…10 min

P36**Heating/cooling changeoverswitching point for cooling 16 °C 10…25 °C

P37**Heating/cooling changeoverswitching point for heating 28 °C 27…40 °C

P38 Input X1 3 = Op mode c/o

0 = --- (no function)1 = Room temp ext. sensor /Return air temp (AI)2 = H/C changeover (AI/DI)3 = Operating mode contact (DI)4 = Dew point sensor (DI)5 = Enable electric heater (DI)6 = Fault input (DI)7 = Monitor input (Digital)8 = Monitor input (Temp)

P39Operating action for X1 if digitalinput NO

NO = Normally OpenNC = Normally Close

P40 Input X2 1 = Ext. sensor

0 = --- (no function)1 = Room temp ext. sensor /Return temp (AI)2 = H/C changeover (AI/DI)3 = Operating mode contact (DI)4 = Dew point sensor (DI)5 = Enable electric heater (DI)6 = Fault input (DI)7 = Monitor input (Digital)8 = Monitor input (Temp)

P41Operating action for X2 if digitalinput 0 (N.O.)

0 = Normally Open1 = Normally Close

P44*** Actuator running time Y11/Y21 150 s 20…300 secP46 Y2x load current 0.0 A 0.0 to 5.0 A

P48On time minimum for 2-pos outputcontrol 1 min. 1...20 min

P49Off time minimum for 2-pos outputcontrol 1 min. 1...20 min

P50 Purge time OFF

OFF: Not active1…5 min: Active with selected

durationP51 Flow temp limit floor heating OFF OFF, 10...50 °C

P52 Fan control 1

0 = Disabled1 = Enabled2 = Heating only3 = Cooling only

P53 Fan speeds 21 = 1-speed2 = 3-speed

P54* Fan overrun time 60 sec 0...360 secP55 Fan speed switching point high 100% 80...100%P56 Fan speed switching point med 65% 30..75%P57 Fan speed switching point low 10% 1...15%P58 Fan start kick ON ON: Enabled

OFF: DisabledP59 Fan minimum on time 2 min 1...6 minP60 Periodic fan kick Comfort 0 0…89 min, OFF(90)P61 Periodic fan kick Eco OFF 0…359 min, OFF(360)

50 / 62


Para

met

er

Name Factorysetting

Range

Expert levelP62 Service filter Off (0) Off, 100…9900 hrsP65 Protection heating setpoint 8 °C OFF, 5…WCoolProt;

WCoolProt = 40 °C maxP66 Protection cooling setpoint OFF OFF, WHeatProt… 40;

WHeatProt = 5°C minP68 Baud Rate 2 0 = 4800 BPS

1 = 9600 BPS2 = 19200 BPS3 = 38400 BPS

P69 Temporary Comfort setpoint OFF OFF = DisabledON = Enabled

P70 Parity 1 0 = Odd

1 = Even2 = No parity

P71 Restore factory setting OFF OFF = DisabledON = Reload start“8888” is displayed for 3s duringreload process

P81 Device address 1 1 … 247

*) Parameter P54 is only displayed for application "2-pipe with electric heater". Alltemperature settings are in increments of 0.5 °C.**) Parameters P36-37 and P50 will only appear when either X1 or X2 set to 2, theH/C changeover.***) Parameters P35 and P44 will only appear when the application (DIP switch) setto 2 pipe 3 position.

Para

met

er

Name Range

Diagnostics & testd01 Application number NONE = (No application)

2P = 2-pipe2P3P = 2-pipe 3-position2PEH = 2-pipe with electric heater4P = 4-pipe

d02 X1 state 0 = Not activated (for DI)1 = Activated (DI)0…49 °C = Current temp. value (for AI)00 = H/C Input shorted100 = H/C Input open

d03 X2 state 0 = Not activated (for DI)1 = Activated (DI)0…49 °C = Current temp. value (for AI)00 = H/C Input shorted100 = H/C Input open

d05*** Test mode for checking theY11/Y21

actuator's running direction

This parameter can only be quit whenthe setting is back at “---”.Press buttons + and – simultaneously to escape.

"---" = no signal on outputs Y11 and Y21OPE = output Y11 forced openingCLO = output Y21 forced closing

***) Parameters d05 will only appear when the application (DIP switch) set to 2 pipe3 position.

Note:

Note:

51 / 62


4. Handling4.1 Mounting and installation

Mount the room thermostat on a recessed square conduit box with 60.3 mm fixingcenters. Do not mount on a wall in niches or bookshelves, behind curtains, aboveor near heat sources, or exposed to direct solar radiation. Mount about1.5 m above the floor.

Mounting · Mount the room thermostat in a clean, dry indoor place without direct airflowfrom a heating / cooling device, and not exposed to dripping or splash water

· In case of limited space in the conduit box, use mounting bracket ARG70.3 toincrease the headroom by 10 mm

Wiring See Mounting Instructions M3079 enclosed with the thermostat.

· Comply with local regulations to wire, protection and earth the thermostat.· The device has no internal fuse for supply lines to fan and actuators. To avoid

risk of fire and injury due to short-circuits, the AC 230 V mains supply line musthave a circuit breaker with a rated current of no more than 10 A.

· Properly size the cables to the thermostat, fan and valve actuators forAC 230 V mains voltage.

· Use only valve actuators rated for AC 230 V· The wiring cross section used for power supply (L, N), fan/relays (Qxx) and

230 V outputs (Yxx -N) must be adapted to the preceding overload protectionelements (max 10A) under all circumstances. Comply under all circumstanceswith local regulations.

· Cables of SELV inputs X1-M / X2-M: Use cables with min AC 230 V insulation,as the conduit box carries AC 230 V mains voltage.

· Inputs X1-M or X2-M: Several switches (e.g. summer / winter switch) may beconnected in parallel. Consider overall maximum contact sensing current forswitch rating.

· Isolate the cables of Modbus communication input +, - and REF for 230 V.· No metal conduits.· No cables provided with a metal shield.· Disconnect from supply before opening the cover.

52 / 62


4.2 Commissioning

The room thermostats are delivered with a fixed set of applications.Select and activate the relevant application during commissioning using one of thefollowing tools:– Local DIP switch and HMI– commissioning tools for RS485 Modbus RTU

Set the DIP switches before snapping the front panel to the mounting plate, if youwant to select an application via DIP switches.

All DIP switches need to be set to “OFF” (remote configuration), if you want toselect an application via Modbus commissioning tool.

After power is applied, the thermostat starts with all LCD segments flashing forabout 3 seconds. Then, the thermostat will be at normal display mode and is readyfor commissioning by qualified HVAC staff.

If all DIP switches are OFF, the display reads "NONE" to indicate that applicationcommissioning via a tool is required.

Each time after a different application is selected, the thermostat reloads thefactory settings for all control parameters EXCEPT the parameters forcommunication settings. e.g. device addresses (P81), Baud rate (P68) and Parity(P70)

The thermostat's control parameters can be set to ensure optimum performance ofthe entire system. The parameters can be adjusted using– Local HMI– commissioning tools

The control parameters of the thermostat can be set to ensure optimumperformance of the entire system (see section 3.13, control parameters).

· The control sequence may need to be set via parameter P01 depending on theapplication. The factory setting is as follows:

Application Factory setting P012-pipe and chilled / heated ceiling 1 = cooling only4-pipe, chilled ceiling and radiator 4 = heating and cooling

· When the thermostat is used with a compressor, adjust the minimum output on-time (parameter P48) and OFF-time (parameter P49) for Y11/Y21 to avoiddamaging the compressor or shortening its life due to frequent switching

· Recalibrate the temperature sensor if the room temperature displayed on thethermostat does not match the room temperature measured (after min. 1 hour ofoperation). To do this, change parameter P05

· We recommend to review the setpoints and setpoint ranges (parametersP08…P12) and change them as needed to achieve maximum comfort and saveenergy

Applications

DIP switches

Note:

Control parameters

Control sequence

Compressor-basedapplications

Calibrate sensor

Setpoint and rangelimitation

53 / 62


4.3 Operation

See also Operating Instructions B3171 [2] enclosed with the thermostat.

RDF302

1 Operating mode selector2 Button to change fan operation3 Buttons to adjust setpoints and control parameters

User action Effect, description

Normal operation Actual operating mode and state areindicated by symbols

Press any button(thermostat in normal operation)

Backlit LCD turns on and… (see below forfurther action)After the last operation and a timeout of 20seconds, the LCD backlight turns off

Press left button Change operating modePress left button (P01 = 2) Toggle between heating and coolingPress left button >5 seconds Activate / deactivate key lockPress right button Change fan modePress + or – Adjusts the Comfort room temperature

setpoint .Thermostat changes to Comfort mode

Press + and – >3 seconds, release,then press + again >3 seconds

Go to parameter setting mode “Servicelevel”

Press + and – >3 seconds, release,then press – again >3 seconds

Go to parameter setting mode “Expertlevel”, diagnostics and test

Layout

Button operation

21

3

54 / 62


1 Operating mode Protection Comfort Economy

2 Displays room temperature,setpoints and control parameters

Symbol indicates current roomtemperature

3 Fan modeAuto fan active

Fan speedlow, medium, high

4 Indicates fault or reminder

5 Heating/cooling mode Cooling Heating Electrical heater active

6 Condensation in room (dew pointsensor active)

7 Additional user information, likeoutdoor temperature ( ) or timefrom Modbus (selectable viaparameters)

8 Key lock active

4.4 Disposal

The devices are considered electronics devices for disposal in terms ofEuropean Directive 2012/19/EU and may not be disposed of as domesticwaste.· Dispose of the device via the channels provided for this purpose.· Comply with all local and currently applicable laws and regulations.

Display1

2

3

6

4

5

758

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5. Connection5.1 Connection terminals

L, N Operating voltage AC 230 VQ1 Control output “Fan speed 1 AC 230 V”Q2 Control output “Fan speed 2 AC 230 V”Q3 Control output “Fan speed 3 AC 230 V”Y11,Y21 Control output “Valve” AC 230 V (N.O., for normally

closed valves), output for compressor or output forelectrical heater

X1, X2 Multifunctional input for temperature sensor (e.g.QAH11.1) or potential-free switchFactory setting:X1 = Operating mode switchover contactX2 = External sensor(function can be selected via parameter P38/P40).

M Measuring neutral for sensor and switch+ RS485 Modbus connection- RS485 Modbus connectionREF RS485 signal/common ground

(Differential common)

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5.2 Connection diagrams

ApplicationN1 Room thermostat RDF302...M1 1- or 3-speed fanV1 Valve actuator, 2- or 3-positionV1, V2 Valve actuator, 2-positionE1 Electric heaterC1, C2 1-stage compressorS1, S2 Switch (keycard, window contact,

presence detector, etc.)B1, B2 Temperature sensor (return air

temperature, external roomtemperature, changeover sensor, etc.)

+ RS485 Modbus connection- RS485 Modbus connectionREF RS485 signal/common ground

(Differential common)

2-pipe / heating orcooling – ON/OFF

2-pipe, / heating orcooling – 3-position– Y11 = Open– Y21 = Close

2-pipe and el.heater/Heating or coolingand el. heater

4-pipe /Heating and radiator– V1 = Heating– V2 = Cooling

1-stage compressor– C1 = Heating

and / or– C2 = Cooling

1-stage compressorand electric heater

L

N

10 A

L

N Y11 Y21AC23

0V X1 M X2

N1

M1V1

5(2)AMax.

5(2)AMax.

B2

S2

B1

S1

3171

A12

Q1 Q2 Q3

I II III

+ -

REF

V1

5(2)AMax.

E1

5(2)AMax.

5(2)AMax.

V1

C1

5(2)AMax.

V1

5(2)AMax.

V2

5(2)AMax.

C1

5(2)AMax.

E1

5(2)AMax.

C2

5(2)AMax.

+-

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6. Mechanical design6.1 General

The thermostats consist of 2 parts:

· Front panel with electronics, operating elements and built-in room temperaturesensor.

· Mounting base with power electronics.

The rear of the mounting base contains the screw terminals.

The base fits on a square conduit box with 60.3 mm fixing centers.

Slide the front panel in the mounting base and snap on.

RDF3021. Operating mode selector2. Change fan operation3. Adjust setpoints and control parameters

For operation, refer to section 4.3.

Operation and settings21

3

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6.2 Dimensions

Dimensions in mm

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7. Technical data

Power supply Rated voltage AC 230 VOvervoltage category IIIFrequency 50/60 HzPower 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-NRating

AC 230 V5 mA…5(2) A

STOP Note!Fans must NOT be connected in parallel!Connect one fan directly, for additional fans, onerelay for each speed.

Control output Y11-N / Y21-N (N.O.)Rating

AC 230 V5 mA…5(2) A

Caution No internal fuse!External preliminary protection with max C 10 A circuit breakers in the supply linerequired in all cases.

Inputs Multifunctional input X1-M/X2-MTemperature sensor input:

TypeTemperature rangeCable length

Digital input:Operating actionContact sensingParallel connection of several thermostatsfor one switch

Insulation against mains voltage (SELV)

NTC (3 kW at 25 °C)0...49 °CMax. 80 m

Selectable (NO / NC)SELV DC 0...5 V / max 5 mAMax. 20 thermostats per switch

4 kV, reinforced insulationFunction of inputs:

External temperature sensor, heating/coolingchangeover sensor, operating mode switchovercontact, dew point monitor contact, enableelectrical heater contact, fault contact,monitoring input

SelectableX1: P38X2: P40

Modbus Interface type RS485 Modbus RTU,Wire (ref.): 16 AWG, 1 pair,shielded serial line with 1.5 mm2

and length < 1200 mBus current Max. 50 mAModbus topology:See Modbus manual (MODBUS over serial line specification and implementationguide from http://www.modbus.org ).


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Operational data Switching differential, adjustableHeating mode (P30)Cooling mode (P31)

2 K (0.5...6 K)1 K (0.5...6 K)

Setpoint setting and rangeComfort (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/X2Input X1 default value (P38)Input X2 default value (P40)

Selectable 0...83 (Op. Mode switchover)1 (External temp. sensor)

Built-in room temperature sensorMeasuring rangeAccuracy at 25 °CTemperature calibration range

0…49 °C< ± 0.5 K± 3.0 K

Settings and display resolutionSetpointsCurrent temperature value displayed

0.5 °C0.5 °C

Environmental conditions OperationClimatic conditionsTemperatureHumidity

As per IEC 60721-3-3Class 3K50...50 °C<95 % r.h.

TransportClimatic conditionsTemperatureHumidityMechanical conditions

As per IEC 60721-3-2Class 2K3-25...60 °C<95 % r.h.Class 2M2

StorageClimatic conditionsTemperatureHumidity

As per IEC 60721-3-1Class 1K3-25...60 °C<95 % r.h.

Standards and directives EU Conformity (CE) CE1T3079xx *)

Electronic control type

Home and Building Electronic Systems

2.B (micro-disconnection onoperation)EN 50090-2-2

Safety class II as per EN 60730Pollution class NormalDegree of protection of housing IP 30 as per EN 60529

Environmental compatibility The product environmental declaration CE1E3079en contains data onenvironmentally compatible product design and assessments (RoHS compliance,materials composition, packaging, environmental benefit, disposal).

General Connection terminals Solid wires or prepared strandedwires 1 x 0.4…1.5 mm2

(Note: For sensors on inputs X1and X2, the cable length is max.80 m.)

Housing front color RAL 9003 whiteWeight without / with packaging 0.174 kg/0.261 kg

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

https://siemens.com/bt/download

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Siemens RDF302 Basic documentation CE1P3079enBuilding Technologies Index 2014-10-16

Index

11-speed fan......................................................... 35

33-position control signal ...................................... 323-speed fan......................................................... 35

AApplications overview ......................................... 16Automatic heating / cooling changeover ........ 20, 23Automatic heating / cooling changeover via bus .. 20

BBasic application ................................................. 29

CChangeover switch ............................................. 20Chilled / heated ceiling applications ..................... 29Clean fan filter reminder ...................................... 36Compressor applications ............................... 16, 29Control outputs configuration .............................. 33Control outputs overview ..................................... 32Control parameters ............................................. 47Control sequences .............................................. 23Cooling sequence ............................................... 23

DDew point monitoring .................................... 22, 37Disposal.............................................................. 54

EElectric heater ..................................................... 25Enable / disable electric heater ..................... 25, 38Expert level parameters ...................................... 47External / return air temperature .......................... 37External / return air temperature sensor .............. 21

FFan kick function ................................................. 35Fan minimum on-time ......................................... 35Fan operation as per heating / cooling mode, or

disabled ........................................................... 35Fan operation in dead zone ................................. 35Fan overrun ........................................................ 36Fan start ............................................................. 35Fault ................................................................... 38Fault on KNX ...................................................... 40Fault, handling .................................................... 39Floor cooling ....................................................... 21Floor heating ....................................................... 21

Floor temperature limitation function ................... 21

HHeating / cooling changeover ........................ 20, 37Heating and cooling sequence ............................ 23Heating sequence .............................................. 23

IIntegral action time .............................................. 11

KKey lock ............................................................. 22

MMain and secondary ........................................... 27Manual heating / cooling changeover .................. 20Manually select heating or cooling sequence ...... 23Minimum output .................................................. 21Moisture ............................................................. 21Mounting and installation .................................... 51Multifunctional inputs .......................................... 37

OON/OFF control signal ........................................ 32Operating mode

Priority intervention ......................................... 13Operating mode button ....................................... 13Operating mode switchover ................................ 37

PParameter setting ............................................... 47Proportional band ................................................ 11Protection mode / Standby.................................. 12Purge function .................................................... 21

RRadiator applications .......................................... 29Remote heating / cooling changeover ................ 20Reset parameters ............................................... 47

SSetpoint Comfort mode ....................................... 30Setpoint Economy mode ..................................... 30Setpoint limitation ............................................... 14Setpoint Protection mode ................................... 30Setpoints and sequences ................................... 30Standby / Protection mode.................................. 12Switching differential ............................................ 11Synchronization .................................................. 33

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Siemens RDF302 Basic documentation CE1P3079enBuilding Technologies Index 2014-10-16

TTemperature out of range .................................... 39Temporary setpoint ............................................. 14

UUniversal applications ......................................... 16

WWindow contact ..................................................13Window state................................................. 12, 37

Siemens Switzerland LtdBuilding Technologies DivisionInternational HeadquartersGubelstrasse 22CH-6301 ZugTel. +41 41-724 24 24Fax +41 41-724 35 22www.buildingtechnologies.siemens.com © 2011 (-2014) Siemens Switzerland Ltd

Subject to change
