Building Management System STP VAV VAV

VAV RP

Building Management System

STP

VAV VAV

Applications of room and system solutions with VAV-UniversalEdition 2021-05/A

Air ratios under control.

Applications, VAV-Universal2

3Applications, VAV-Universal

Subject to technical modifications

Preface

Thank you for your interest in our products. In this brochure, you will find information on volumetric flow, duct pressure and room- pressure applications with the new VAV-Universal product range from Belimo.

All chapters are structured as follows:

– Brief description– Principle diagram– Function diagram– Device selection – Diagram– Parameter and tool overview

The last chapter, starting on page 61, also provides an overview of general principles such as connections, local override controls, sequential versus parallel control, etc. At www.belimo.com you will find further solutions from Belimo relating to the areas of room and system solutions, bus and system integration, ventilation applications and sensors. Please contact us for more information.

NoteThe Belimo VAV product range – VAV- Compact and VAV-Universal components incl. replacement devices – is only available from manufacturers of VAV units (OEM).Please contact the desired supplier. Your local Belimo representative is happy to help you if necessary.

Reference point

Duct pressure control loop

Measurement point

The diagram shows an example of the principle of one duct (line) pressure control.



VAV-Universal – maximum flexibility for increased requirementsVentilation concepts according to DIN EN 15232 require modern, energy-efficient VAV control concepts and ensure operation as required from the fan to the room. Not as much as possible, but as much as necessary.In addition to the proven VAV-Compact product range, which covers around 90 percent of VAV applications, the modern VAV-Universal product range is now available for special applications. Its modular design, consisting of a VRU controller with integrated high-quality Δp sensor technology, enables the optimum combination of controller and damper motorisation for all VAV, duct pressure and room-pressure applications.

VRU controller sensor unitThe VRU controller sensor unit was developed for use in building technology and is perfectly matched to the VST actuators that belong to the system. Two sensor variants are available: in addition to the well-established, dynamic D3 sensor, the new M1 membrane sensor is also available.The system supports volumetric flow (VAV), duct pressure (STP) and room-pressure (RP) applications. The control via analogue, BACnet/Modbus, in hybrid mode or MP-Bus is preset with the corresponding tools by the OEM or on the system during system integration. NFC interface, service socket or a PP interface are available for easy tool connection.

VST actuator product rangeThe range of damper actuators with plug-and-play function includes rotary actuators, very fast running actuators and fail-safe rotary actuators. The actuator running time is detected by the VRU controller and used to optimise the control performance.

Belimo product types



Tools for easy commissioning and parametrisationWith the Belimo Assistant App (Android, iOS), actual and setpoint values can be displayed graphically as trend data or parameters adjusted on the system via Bluetooth or NFC. The Belimo PC-Tool is available to system integrators and VAV manufacturers for the production of the VAV unit.

VAV-Compact L/N/SMV-D3-…The system solution for volumetric flow systems to equip your VAV units for VAV or CAV applications. For analogue control or for direct integration into Modbus, BACnet, KNX or MP-Bus systems. See www.belimo.eu



Product and function overviewFunction Characteristic VRU-D3-BAC VRU-M1-BAC VRU-M1R-BAC

Application VAV/CAV Volumetric flow

Measure volumetric flow Volumetric flow

Position Control (Open-Loop) Volumetric flow

Duct pressure control Δp

Room-pressure control Δp

Room-pressure cascade control

Δp Room-pressure volumetric flow control

Flow Flow Δp

Integration in DCV system Requirement recording via damper position

Control Modulating min./max.

Step mode min./max.

Local override – input z1

Motor stop/damper OPEN

Local override – input z2

Damper CLOSED/max.

Room-pressure mode +/– Adjustable via Tool/Modbus/BACnet

Control (adjustable with Tool)

0…10 V/2…10 V/variable/bus

Modbus RTU, incl. hybrid mode

BACnet MS/TP, incl. hybrid mode

MP-Bus 1)

Feedback (Feedback U5) 0…10 V/2…10 V variable/bus

Volumetric flow/Δp/position ΔpΔp sensor Measuring principle D3 - flow (dynamic)

M1(R) - diaphragm (static)

Measuring ranges Application-dependent (VAV 0…500 Pa) 0...500 Pa 0...600 Pa −75...75 Pa

Field of application Comfort zone

Polluted air (compatibility test required)

Actuator Ready-to-connect connection Plug-and-play function

L/N/SM24A-VST 5/10/20 Nm, 120 s, rotary actuator

L/NMQ24A-VST 4 Nm, 2.4 s/8 Nm, 4 s, very fast running actuator

NKQ24A-VST 6 Nm, 4 s, very fast running actuator, electrical fail-safe

N/SF24A-VST LF24-VST

4/10/20 Nm, 120 s, mechanical fail-safe

Tools Assistant App, NFC NFC/Bluetooth

PC-Tool Default/OEM Manufacturing Tool

Note: VAV-Universal components incl. replacement units are only available from manufacturers of VAV units (OEM). The components VRD. /VRP.../..-V/..-SRV-ST of the old VAV-Universal product range are not compatible with the VRU./...-VST. Please contact your Belimo representative for further assistance.

1) RPC room-pressure cascade controllers cannot be integrated into MP-Bus systems.



Terms

CAV Constant Air VolumeVAV Variable Air VolumeDCV Demand Controlled VentilationBMT Building management technology

DPC Duct pressure controllerRP Room-pressure controllerRPC Room-pressure cascade

cw Clockwise direction of rotationccw Anticlockwise direction of rotationmin. Operating mode min. according to the application V′min, P′min, min.max. Operating mode max. according to the application V′max, P′max, max.P′nom

1) Pressure application Δp control nominal setting1)

V′nom1) VAV applications volumetric flow nominal setting1)

Δp@V′nom1) VAV applications calibration unit VAV unit1)

1) OEM factory setting: fixed setting, values cannot be changed

D3 Δp sensor, D3 – flow sensor (dynamic)M1(R) Δp sensor, M1(R) – diaphragm sensor (static)VRU… VAV-Universal controller, Δp sensor unit…-VST VAV-Universal actuator, suitable for the VRU… controllerVC VAV-Compact product range, compact solution VAV controller and Δp sensor integrated in actuatorVU VAV-Universal product range, modular solution, VAV controller with integrated Δp sensor and external actuator

MOD Modbus interfaceBAC BACnet interfaceMP MP-Bus interfaceNFC Chip (Near Field Communication), interface for wireless tool connection

OEM Original Equipment Manufacturer


Page

Volumetric flow control VAV/CAVVRU-D3-BAC/VRU-M1-BAC

11

Volumetric flow measurementVRU-D3-BAC/VRU-M1-BAC

17

Position Control (Open-Loop)VRU-D3-BAC/VRU-M1-BAC

23

Duct pressure control STPVRU-D3-BAC/VRU-M1-BAC

29

Room-pressure control RPVRU-M1R-BAC

35

Room-pressure – VAV unit with bypass control RPVRU-D3-BAC/VRU-M1-BAC, VRU-M1R-BAC

43

Volumetric flow and room-pressure cascade control [RPC]VRU-D3-BAC/VRU-M1-BAC, VRU-M1R-BAC

51

ConnectionVRU-D3-BAC/VRU-M1-BAC/VRU-M1R-BAC

61

SUP/ETA unit in conjunctionVRU-D3-BAC/VRU-M1-BAC

65

Local override control z1/z2 Priority controlVRU-D3-BAC/VRU-M1-BAC/VRU-M1R-BAC

69

Commissioning room/duct pressure applications – Controller settingVRU-M1R-BAC/VRU-M1-BAC/VRU-D3-BAC

73

Table of contents

1

2

3

4

5

6

7

8

9

10

11


1


Page

Brief description12

Principle diagram

Function diagram13

Device selection

Diagram 14

Parameter and tool overview 15

Volumetric flow control VAV/CAVVRU-D3-BAC/VRU-M1-BAC

1



Brief description–Variablevolumetricflowcontrol(VAV) V′min...V′max

–Constantvolumetricflowcontrol(CAV) DamperCLOSED/V′min/V′max / DamperOPEN

Volumetric flow control VAV/CAV

Principle diagram

Illustration example

A

A

B

-+

SUP

SUPETA

Ventilation system with constant [CAV] and variable air volume [VAV]–RoomandzoneapplicationsSUPunitorSUPandETAunit,incomfortzone–Extractair/extractionsystemsforpollutedextractair,e.g.kitchenextractair

TheVAV-UniversalVRU-...controlunitcontrolsthevolumetricflowspecifiedbythe room automation system, e.g. via a room temperature or air quality controllerforthedownstreamzone/room.Pressurefluctuationsintheairductsystem are detected and automatically corrected. Thefollowingvariantsareavailable incombinationwiththeactuatorsolutionoptimally suited to the application:– VRU-D3-BAC for comfort zone– VRU-M1-BAC for comfort zone and for polluted extract airThedamperpositionoftheVAVunitisavailableforDCVapplicationsviatheselectedbussystem(FanOptimiserfunction).

Device selectionProduct type from Belimo Function Sensor/actuator characteristic Field of application SUP unit ETA unit

VRU-D3-BAC VAV/CAV controller Δpsensor,integratedD3flowsensor0...500Pa

Comfort

VRU-M1-BAC VAV/CAV controller Δpsensor,integratedM1diaphragmsensor0...600Pa

ComfortPolluted air

L/N/SM24A-VST Rotary actuator, default 5/10/20Nm,120s All ranges

LF/NF/SM24A-VST

Rotary actuator, mechanical fail-safe

4/10/20Nm,120s,spring20s All ranges

LMQ24A-VST Rotary actuator, very fast running 4Nm,2.4s All ranges

NMQ24A-VST Rotary actuator, very fast running 8Nm,4s All ranges

NKQ24A-VST Rotary actuator, very fast running,electrical fail-safe

6Nm,4s All ranges

1

Control functions–V′min Minimum air exchange rate, hygiene section, building

protection(airhumidityetc.)–V′max Maximum air exchange rate, maximum cooling load,

removal of emissions–V′min…V′max Partialloadoperation-variablevolumeoperation(VAV)

–Localoverride(z1/z2) Motorstop,damperOPEN,V′max,damperCLOSED–Control analogue0…10V/2…10V,Modbus1), BACnet1),

MP-Bus1) Hybrid mode possible

Function diagram

VAV control: analogue/bus (setpoint) Feedback U5/bus (actual value)

0%

V′m

in (<

V′m

ax)

V′m

ax (>

V′m

in)

100%

a) V′nomb) ∆p@V′nomc)

100%

20%

V′max

V′min

0% 100%

Volumetricflow Volumetricflow/Δp/position

Actual value [U5]Setpoint[Y]

Rang

e

Rang

e 100%damperposition



Diagram

Analogue control [Mode 0...10/2...10 V]–VAVmode:V′min/V′max

Analogue control [Mode 2...10 V]–CAVsteps:damperCLOSED/V′min/V′max

1 2 3 5 6 7 8 9 10 11 12 13 14 15 16

1 2 3 5 6 7 8 9 10 11 12 13 14 15 16

AC/DC 24 V

min

.m

ax.

A

B

1 2 3 5 6 7 8 9 10 11 12 13 14 15 16

1 2 3 5 6 7 8 9 10 11 12 13 14 15 16

AC/DC 24 V

AC/DC 24 V AC/DC 24 VMP-Master

MP

1)

A

B

1 2 3 5 6 7 8 9 10 11 12 13 14 15 161 2 3 5 6 7 8 9 10 11 12 13 14 15 16BA BA

GND

D−D+

MP-Bus

Control0/2...10V

Feedback

Feedback Feedback

DamperCLOSEDFeedback

Control0/2...10V

Hybrid mode

FeedbackU0/2...10V

Mode RTU, BACnet MS/TP

Option VAV-CompactProduct type from Belimo Function Sensor/actuator characteristic Field of application SUP unit ETA unit

L/N/SMV-D3... VAV-Compactcontroller(VAV/CAV) Δpsensor,integratedD3flowsensor0...500PaRotaryactuator5/10/20Nm,integrated

Comfort

Seewww.belimo.eu

1)OtherMPdevices(total8)

Safety requirementsOnlyauthorisedspecialistsmaycarryout installation.Allapplicable legalandgovernment agency regulations must be complied with during use. Connection via an isolating transformer.SeeVAV-Universal-VRUProductInformation:www.belimo.eu

Explanations/notes– Priority control p. 71– Connection z1/z2 p. 61–Sensorintegrationbusmode p.61– VRP-M replacement in existing MP-Bus system: Seeseparateinstructions

VAV-Universal-VRU in VRP-Mcompatibilitymode(MP)



Parameter and tool overview for volumetric flow control VAV/CAVApplica-tion Tool

Authori-sation

Parameter/function Unit/value Function/description/(area) VAV/

CAV

Ass

ista

nt a

pp

PC

-Too

l

ZTH

EU

Expe

rt/O

EM

VAV unit – manufacturer parameters (OEM values – not variable)

Application Volumetricflow Application setting r r r O

Designation Text Modeldesignationunit/damper(16Z.) r r – O

V′nom m3/h/l/s/cfm Volumetricflownominalvalue r r r O

Δp@V′nom Pa CalibrationVAVunit[38…500Pa] r r – O

SNactuator xxxxx-xxxxx-xxx-xxx Actuator serial number r – –

Rotation direction ccw/cw Actuator direction of rotation setting r/w r/w – E

Range of rotation Adapted/programmed Actuator adapted/programmed30...95°

r/w r/w – E

Power-on behaviour Noaction/synch./adaption

Actuator power-on behaviour r/w r/w – E

Damperleakage suppressed

OFF/ON Retrofitapplication,damperleakage r r – O

NFCinterface ON/OFF NFCCommunicationforappaccess r r – O

Parametrisation – Project specific settings

Position Text Systemdesignation(64Z./ZTH16Z.) r/w r/w r

V′max m3/h/l/s/cfm(ZTH%) OperatingvolumetricflowV′max 20…100%V′nom

r/w r/w r/w

V′min m3/h/l/s/cfm(ZTH%) OperatingvolumetricflowV′min 0…100%V′nom

r/w r/w r/w

Altitude compensation ON/OFF Switchfunctionon/off r/w r/w – E

Altitude of installation 0m CompensatedΔpandvolumetricflowvalues to set the altitude of installation (abovesealevel)

r/w r/w – E

Control function VAV/CAV VAV control, active r/w r/w – E

Room-pressure cascade

OFF VAV: secondary circuit room pressure cascade

r/w r/w – E

Setpoint Analogue/bus Analogue and hybrid mode/bus r/w r/w – E

Setpointoffset 0% VAV:±5%compensationABLunit r/w r/w – E

ReferencesignalY 2...10V/0...10V/adjustable SettingforVAVcontrol r/w r/w – E

Feedbacktype Volumetricflow/Δp/position Volume/Δp/damperposition r/w r/w – E

FeedbackU 2...10V/0...10V/adjustable SettingUsignal r/w r/w – E

1

Legendr Tool:readwTool:write– Tool:DoesnotsupportparameterE OnlyvisibleinExpertMode

Availability: VAV-Universal components incl. replacement devices are only availablefrommanufacturersofVAVunits(OEM).Permissions: [O–OEM,manufacturermode]– VRU controllers are calibrated and

parameterised by the unit manufacturer according to the application andtheproject.Thesesettingscanonlybechangedbythe manufacturer. [E–ExpertMode]– Functionally relevant settings are only accessible viatheExpertModeoftheBelimoAssistantApp.


2


Page

Brief description18

Principle diagram

Function diagram19

Device selection

Diagram 20


Volumetric flow measurementVRU-D3-BAC/VRU-M1-BAC

2



Brief descriptionVolumetric flow measuring device (transmitter) for detecting or monitoring volumetricflow

Principle diagram


-+

- +

-+

CommonETA-VAVunit

Volumetric flow measurement

Setpoint[Y]

Volumetricflowmeasuringdevicesfordetectingormonitoringvolumetricflow–Inairhandlingunitsincomfortzonesandforpollutedfluid–E.g.forrecordingthetotalsupplyairforthesetpointspecificationofa

common extract air-side VAV unit–Displayfunction0…100%V′nom

–Analogueintegration0…10V/2…10V,Modbus,BACnet,MP-Bus

Volumetric flow measurement



Function diagram


VRU-D3-BAC VAV/CAV controller Δpsensor,integratedD3flowsensor0...500Pa

Comfort

VRU-M1-BAC VAV/CAV controller Δpsensor,integratedM1diaphragmsensor0...600Pa

ComfortPolluted air

2

Feedback U5/bus (actual value)

0%min.

max.

100%

Volumetricflow

Actual value [U5]



Diagram

Safety requirementsOnlyauthorisedspecialistsmaycarryout installation.Allapplicable legalandgovernment agency regulations must be complied with during use. Connection via an isolating transformer. SeeVAV-Universal-VRUProductInformation:www.belimo.eu

Analogue operation [Mode 0...10/2...10 V]DisplayV′nom


Explanations/notes– Priority control p. 71– Connection z1/z2 p. 61–Sensorintegrationbusmode p.61– VRP-M replacement in existing MP-Bussystem: Seeseparateinstructions


1 2 3 5 6 7 8 9 10 11 12 13 14 15 16

AC/DC 24 V


MP

1)

1 2 3 5 6 7 8 9 10 11 12 13 14 15 161 2 3 5 6 7 8 9 10 11 12 13 14 15 16

GND

D−D+

MP-Bus

Volumetricflow0/2...10V


Control0/2...10V

Hybrid mode

FeedbackU0/2...10V



Parameter and tool overview for volumetric flow measurementApplica-tion Tool

Authori-sation


CAV

Ass

ista

nt a

pp

PC

-Too

l

ZTH

EU

Expe

rt/O

EM



Designation Text Model designation measuring device (16Z.)

r r – O







r/w r/w – E

Feedbacktype Volumetricflow Volume r/w r/w – E





2


3


Page

Brief description24

Principle diagram

Function diagram25

Device selection

Diagram 26

Position Control (Open-Loop)VRU-D3-BAC/VRU-M1-BAC

3



Brief descriptionVAV-Universal-VRU-… sensor/actuator in position control mode (Open-Loop, i.e.VAVcontrolfunctioninactive)–Volumetricflowdisplay 0...100%V′nom

–Damperactuator,control 0...100%rangeofrotation

Position Control (Open-Loop)

Principle diagram


-+

Application noteWhen designing the bus application, the cycle times for reading the actual valuesandwritingthedamperpositionmustbetakenintoaccount.

In this application, the VAV-Universal VRU-... functions solely as a sensor and actuator element. Position control mode: volumetric flow/pressure control inactive.– VRU-D3-BAC for comfort zone– VRU-M1-BAC for the comfort zone and polluted extract air

Position control function–Volumetricflowdisplay 0...100%V′nom

–Damperactuator,control 0...100%rangeofrotation–Localoverride(z1/z2) Motorstop,damperOPEN,damperCLOSED–Control analogue0…10V/2…10V, Modbus 1), BACnet 1), MP-Bus1) Hybrid mode possible



Function diagram


VRU-D3-BAC PositionControl(Open-Loop) Δpsensor,integratedD3flowsensor0...500Pa Comfort

VRU-M1-BAC PositionControl(Open-Loop) Δpsensor,integratedM1diaphragmsensor0...600Pa

ComfortPolluted air


LF/NF/SF24A-VST Rotary actuator, mechanical fail-safe




NKQ24A-VST Rotary actuator, very fast running,electrical fail-safe

6Nm,4s All ranges

3

Position control: analogue/bus (setpoint) Feedback U5/bus (actual value)

0%min.

max.

100%

Position

Setpoint[Y]0% 100%

a) V′nomb) ∆p@V′nomc)

Volumetricflow/Δp/position

100%damperposition

Actual value [U5]






Diagram

Analogue control [Mode 0...10/2...10 V]–Modulatingcontrol:0...100%rangeofrotation


1 2 3 5 6 7 8 9 10 11 12 13 14 15 16

AC/DC 24 V


MP

1)

A

1 2 3 5 6 7 8 9 10 11 12 13 14 15 161 2 3 5 6 7 8 9 10 11 12 13 14 15 16A A

GND

D−D+

Control0/2...10VFeedback

MP-Bus


Control0/2...10V

Hybrid mode

FeedbackU0/2...10V



3

Parameter and tool overview for volumetric flow control position controlApplica-tion Tool

Authori-sation


CAV

Ass

ista

nt a

pp

PC

-Too

l

ZTH

EU

Expe

rt/O

EM









r/w r/w – E

Power-on behaviour Noaction/synch./adaptation





max. % Damperposition0...100% r/w r/w r/w

min. % Damperposition0...100% r/w r/w r/w



r/w r/w – E

Control function VAV/CAV VAVcontrolinactive(Open-Loop) r/w r/w – E


ReferencesignalY 2...10V/0...10V/adjustable Settingfordampercontrol r/w r/w – E







4


Page

Brief description30

Principle diagram

Function diagram31

Device selection

Diagram 32


Duct pressure control STPVRU-D3-BAC/VRU-M1-BAC

4



Brief descriptionDuct/line pressure control–Variableoperation(STP) P′min...P′max

–Constantpressurecontrol(STP) P′min/P′max

damperCLOSED/damperOPEN

Duct pressure control STP

Duct and line pressure control in ventilation systems–Storeyline– Pre-pressure, control e.g. for active cooling ceiling systems

TheVAV-UniversalVRU-...controlunitcontrols theductpressure required fortheapplication.Pressurefluctuationsintheairductsystemaredetectedandautomatically corrected.Thefollowingvariantsareavailable incombinationwiththeactuatorsolutionoptimally suited to the application:–VRU-D3-BACoperatingrange38…500Pa–VRU-M1-BACoperatingrange38…600PaThe damper position is available for DCV applications via the selected bus system(FanOptimiserfunction).

Control setting, see Commissioning room/duct pressure applications page 73

Principle diagram


Duct pressure controller

Measurement point [+]

Referencepoint[−]

Control functions–P′min Pressure level 1–P′max Pressure level 2–P′min…P′max Variableoperation(STP)

–Localoverride(z1/z2) Motorstop,damperOPEN,P′max,damperCLOSED

–Control analogue0…10V/2…10V, Modbus 1), BACnet 1), MP-Bus1) Hybrid mode possible

Max.hoselineforD3sensor(VRU-D3-BAC)The pressure drop in themeasurement signal cable generates ameasuring error ofmaximum2.5%.Useof theVRU-M1-BAC is recommended for appli- cationswithmeasurementsignalcables>20m.

Device selectionProduct type from Belimo Function Sensor/actuator characteristic Field of application

VRU-D3-BAC Duct pressure controller- lower control limit 38 Pa

Δpsensor,integratedD3flowsensor0...500Pa Comfort

VRU-M1-BAC Duct pressure controller- lower control limit 38 Pa

Δpsensor,integratedM1diaphragmsensor0...600Pa

ComfortPolluted air




4

Function diagram

Δp control: Y/bus (setpoint) Feedback U5/bus (actual value)

0%

P'm

in (<

P'm

ax)

P 'm

ax (>

P'm

in)

100%

a) P'nomb)

100%

38 Pa

P'max

P'min

0% 100%

Air duct pressure Δp/position

Actual value [U5]Setpoint[Y]

100%damperposition

Rang

e 1)

Rang

e 1)

1)Note:Thecontrollimit/nominalvoltagerangeSTPisunderrevision.(Release:3rdquarter2021)



Diagram

Analogue control [Mode 0...10/2...10 V]–Modulatingoperation:P′min...P′max

Analogue control [Mode 2...10 V]–Stepmode:damperCLOSED/P′min/P′max

1 2 3 5 6 7 8 9 10 11 12 13 14 15 16

AC/DC 24 V

min

.m

ax.

1 2 3 5 6 7 8 9 10 11 12 13 14 15 16

AC/DC 24 V


MP

1)

1 2 3 5 6 7 8 9 10 11 12 13 14 15 161 2 3 5 6 7 8 9 10 11 12 13 14 15 16

GND

D−D+


FeedbackDamperCLOSED





MP-Bus


Control0/2...10V

Hybrid mode

FeedbackU0/2...10V



Parameter and tool overview for duct pressure control STPApplica-tion Tool

Authori-sation

Parameter/function Unit/value Function/description/(area) STP

Ass

ista

nt a

pp

PC

-Too

l

ZTH

EU

Expe

rt/O

EM

Pressure control damper – manufacturer parameters (OEM values – not variable)

Application Air duct pressure Application setting r r r O

Designation Text Modeldesignationdamper(16Z.) r r – O

P′nom Pa NominalvalueP′nom

VRU-D338…500PaVRU-M138...600Pa

r r r O




r/w r/w – E






P′max Pa(ZTH%) 38Pa…100%P′nom 2)

ΔpstepP′maxr/w r/w r/w

P′min Pa(ZTH%) 38Pa…100%P′nom 2)

ΔpstepP′minr/w r/w r/w

Altitude compensation 1)

ON/OFF Switchfunctionon/off r/w r/w – E

Altitude of installation 1) 0m CompensatedΔpvaluetosetthe altitudeofinstallation(abovesealevel)

r/w r/w – E


ReferencesignalY 2...10V/0...10V/adjustable Settingformodulatingcontrol r/w r/w – E

Feedbacktype Δp/position Δp/damperposition r/w r/w – E


4

1)OnlyforVRU-D3-BAC2)Lowercontrollimit:38Pa(asof31.03.2021). Note:Thecontrollimit/nominalvoltagerangeSTPisunderrevision. (Release:3rdquarter2021)


Availability: VAV-Universal components incl. replacement devices are only availablefrommanufacturersofVAVunits(OEM).

Permissions: [O–OEM,manufacturermode]–VRUcontrollersarecalibratedandparameterised by the unit manufacturer according to the application andtheproject.Thesesettingscanonlybechangedbythe manufacturer. [E–ExpertMode]–FunctionallyrelevantsettingsareonlyaccessibleviatheExpertModeoftheBelimoAssistantApp.


5


Page

Brief description36

Principle diagram

Function diagram38

Device selection

Diagram 39


Room-pressure control RPVRU-M1R-BAC

5



Brief descriptionRoom-pressurecontrolRP,suitable for roomswithnon-critical leakagerates/overflows–Modulating P′min ...P′max/Motor stop–Stepmode P′min /P′max/damperCLOSED/damperOPEN/Motorstop

Room-pressure control RP

Ventilationsystems–withnon-critical leakagerates–fordefinedpositiveor negative room-pressure conditions:–Leakagerateof>5...10%V’supply

–RoomtightnessclassaccordingtoVDI2083-19;Class0and1– Room and zone applications, e.g. with odour nuisance in restaurants, smokingrooms

– Room applications with polluted extract air, e.g. extract air in commercialkitchens

Theroom-pressurecontroller–VRU-M1R-BACApplication[RP]–comparesthepressure in the room relative to the reference value and controls the control damper to the adjusted room-pressure setpoint. With actuator solution optimally suited to the application.TheoppositeVAVunitisresponsiblefortheairexchangeraterequiredfortheroom, e.g. external room temperature or air quality controller.



Setpointvolumetricflow,e.g.room-temperature or air-quality controller

-+

A

SUPunitVAV/CAV

VAV-Universal

VAV-Compact

or

Also in combination with VAV-Compact

Referencepoint[−]


Principle diagram



Requirements (applies to positive and negative room-pressure applications)– VRU-M1R-BAC Room-pressure application [RP] with sensorrange−75…75Pa

–Measurementroom Connectpressurelinetothe(+)ofthe VRU-M1R-BAC

–Referenceroom Connectpressurelineto(−)oftheVRU-M1R-BAC Room-pressure – Operation mode (positive/negative pressure)If necessary, the room pressure can be switched from positive to negative pressure(pressurelinesremainunchanged!):Forthispurpose,theP′nom/P′max/P′min are mirrored in the negative range.Example:P′min10Pabecomes−10Pa.Thechangeovertakesplaceat:– Analogue control/MP-Bus Belimo Assistant App– Modbus/BACnet Belimo Assistant App or Command "OperatingMode"

– Control functions–P′min Room-pressure setpoint 1 P′max Room-pressure setpoint 2 (stepmodeormodulatingcontrol)–Applicationarea SUP-sideorETA-sideassembly

arrangement– Room-pressure mode Positive/negative pressure

– Door monitoring – Motor stop Actuatorremainsincurrentpositionwhendoorisopen(z2)

–"OperationMode"positive/negativepressure Changeovervia"OperationMode"busorAssistantApp,PC-Tool

–Localoverride(z1/z2) Motorstop,damperOPEN,P′max,damperCLOSED

–Control:analogue0…10V/2…10V,Modbus1), BACnet 1), MP-Bus

5

1) Hybrid mode possible



Device selectionProduct type from Belimo Function Sensor/actuator characteristic Field of application SUP ETA

VRU-M1R-BAC Room-pressure controller Δpsensor,integratedM1diaphragmsensor−75...75Pa

Comfort, polluted air






NKQ24A-VST Rotary actuator, very fast running,electrial fail-safe

6Nm,4s All ranges

Foroperationinthenegative-pressurerange,P′nom/P′max/P′min are mirrored in the negative range.Example:+Positivepressure: P′min5Pa/P′max10Pa,becomes−Negativepressuresetting: P′min−5Pa/P′max−10Pa

Function diagram

Positive room pressure Changeover operation: positive/negative pressure

50 Pa

0 Pa

–50 Pa

0 100%

0 100%

a) P'momb)

50 Pa

0 Pa

–50 Pa

0 100%

P'min– P'max

–

P'nom–

P'min

P'max

P'nomP'max

P'nom

P'min


Setpoint[Y]

Negativepressure

Tool/Bus:OperationMode

Tool/Bus:OperationMode

Positive pressure Positive pressure

Actual value [U5]

Δproom

ΔproomΔproom

100%damperposition

Setpoint[Y]



Diagram

5


Analogue control [Mode 0...10/2...10 V]–Stepmode:P′min /P′max



A

A

A

A 1 2 3 5 6 7 8 9 10 11 12 13 14 15 16

AC/DC 24 V

max

.m

in.

1 2 3 5 6 7 8 9 10 11 12 13 14 15 16

AC/DC 24 V


MP

1)

1 2 3 5 6 7 8 9 10 11 12 13 14 15 161 2 3 5 6 7 8 9 10 11 12 13 14 15 16

GND

D−D+


Feedback

Motor stop

Motor stop

Motor stop

Motor stop

MP-Bus


Control0/2...10V

Hybrid mode

FeedbackU0/2...10V



Explanations/notesReference A pressure-stable environment is a prerequisite for measurementfor thereferencemeasuringpoint[−]connection,asthishas the[−]connection a direct influence on the room-pressure control.

Anypressurefluctuationofthereferenceistransmitted to the room to be controlled. A pressure-controlled anteroomasa referencemakes reliable room-pressurecontrol impossible.

An environment isolated from the ventilation system - no pressure-controlled or volume-controlled rooms - provides this prerequisite.

Measurementsignal To minimise the influence of the measurement signal cables cables,thesignalcablelengthsshouldbekeptasshort

as possible.

Doorswitch The VRU-M1R can be equipped with a "Motor Stop" command to prevent the damper actuator from moving to the end position when the door is opened.

Switchdesign: Noteperformancedataofinputz2!

– Priority control p. 71– Connection z1/z2 p. 61–Sensorintegrationbusmode p.61– VRP-M replacement in existing MP-Bussystem: Seeseparateinstructions




5

Parameter and tool overview for room-pressure control RPApplica-tion Tool

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Application Room pressure Application setting r r r O


P′nom Pa NominalvalueΔpRP[5…75Pa] r r r O




r/w r/w – E






P′max Pa(ZTH%) Δpstepmax.20…100%P′nom r/w r/w r/w

P′min Pa(ZTH%) Δpstepmin.0…100%P′nom r/w r/w r/w

Room-pressure mode Positive pressure/negative pressure

Roomoperatingmodeaseptic(+)/ septic(−)

r/w r/w – E

Application area Exhaustair/supplyair Mounting location of the control damper r/w r/w – E


OFF In connection with the room-pressure cascade

r/w r/w – E


ReferencesignalY 2...10V/0...10V/adjustable SettingformodulatingcontrolP′min ...P′max r/w r/w – E




Availability: VAV-Universal components incl. replacement devices are only availablefrommanufacturersofVAVunits(OEM).Permissions: [O– OEM,manufacturermode]– VRU controllers are calibrated and



6


Page

Brief description44

Principle diagram

Function diagram 45/46

Device selection 46

Diagram 47

Parameter and tool overview 48/49

Room-pressure – VAV unit with bypass control RPVRU-D3-BAC/VRU-M1-BAC, VRU-M1R-BAC

6

Brief descriptionRoom-pressure volumetric flow bypass damper control for rooms with low leakagerate/overflow:<A>VolumetricflowVAV/CAV V′min...V′max

VRU-D3-BAC/VRU-M1-BAC [VAV]<C>Room-pressurebypassdamper P′min...P′max

VRU-M1R-BAC[RPC]−75...75Pa

Room-pressure – VAV unit with bypass control RP

Principle diagram


Also in combination with VAV-Compact

C

A B ExtractairVAVunit

Bypass room pressure

SUPunitVAV/CAV

Volumetricflowsetpoint

Referencepoint[−]


Ventilationsystemswithdefinedpositiveornegativeroompressureforroomswithlowleakagerate/overflow.–Leakagerateof<5%fromV’supply

–RoomtightnessclassaccordingtoVDI2083-19;Class2and3– Application examples for "sensitve room pressure applications"The two VAV units <A> are responsible for the air exchange rate required for the room, e.g. external room temperature or air quality controller. Theroom-pressurecontrollerVRU-M1R-BAC<C>comparesthepressureintheroomwiththedefinedreferencevalueandthencontrolsthebypassdamperto thespecifiedroom-pressuresetpoint.Requirements(appliestopositiveandnegativeroom-pressureapplications)– VRU-M1R-BAC Room-pressure application [RP] with sensor range

−75…75Pa Extract-air-side-mountedorsupply-air-side-mounted (settingparameters)–Measurementroom Connectpressurelinetothe(+)ofVRU-M1R-BAC–Referenceroom Connectpressurelineto(−)oftheVRU-M1R-BAC

Room-pressure – Operation mode (positive/negative pressure)If necessary, the room pressure can be switched from positive to negative pressure(pressure linesremainunchanged!):forthispurpose,P′nom/P′max/P′min are mirrored in the negative range. Example:P′min Thechangeovertakesplaceat:– Analogue control/MP-Bus Belimo Assistant App–Modbus/BACnet BelimoAssistantAppor"OperatingMode"

command VAV control functions <A> –V′min...V′max Air exchange rate, CAV step mode or VAV

modulatingcontrolV′min...V′max

RP control functions <C>–P′min Room-pressure setpoint 1–P′max Room-pressure setpoint 2

(stepmodeormodulatingcontrol)–Applicationarea: SUPorETA-sideassemblyarrangement– Room-pressure mode Positive/negative pressure–"OperationMode"positive/negativepressure Changeovervia"OperationMode"busorAssistantApp,PC-Tool

–Localoverride(z1/z2) P′max,damperCLOSED,damperOPEN,motorstop

–Control:analogue0…10V/2…10V,Modbus1), BACnet 1), MP-Bus

6

1) Hybrid mode possible

Function diagram

VAV mode: analogue/bus (setpoint) Feedback U5/bus (feedback)

0%

V'm

in (<

V'm

ax)

V'm

ax (>

V'm

in)

100%

a) V'nomb) ∆p@V'nomc)

100%

20%

V'max

V'min

0% 100%

Volumetricflow Volumetricflow/Δp/position

Actual value [U5]

100%damperposition

Setpoint[Y]

Rang

e

Rang

e

Device selection <A> VAV unitsProduct type from Belimo Function Sensor/actuator characteristic Field of application SUP unit ETA unit

VRU-D3-BAC Volumetricflowcontroller[VAV]<A> 

Δpsensor,D3flow 0…500Pa Comfort

VRU-M1-BAC Volumetricflowcontroller[VAV]<A> 

Δpsensor,M1diaphragm 0…600Pa

ComfortPolluted air


Device selection <C> bypass damperProduct type from Belimo Function Sensor/actuator characteristic Field of application SUP unit ETA unit

VRU-M1R-BAC Room-pressure controller [RP] <C> Δpsensor,M1diaphragm −75…75Pa

ComfortPolluted air




NKQ24A-VST Rotary actuator, very fast running electrical fail-safe

6Nm,4s All ranges

Function diagram

Positive pressure Changeover positive: overpressure/negative pressure

50 Pa

0 Pa

–50 Pa

0 100%

0 100%

a) P'momb)

50 Pa

0 Pa

–50 Pa

0 100%

P'min– P'max

–

P'nom–

P'min

P'max

P'nomP'max

P'nom

P'min


For operation in the negative-pressure range, P′nom/P′max/P′min are mirrored in the negative range.Example: + Positive pressure setting: P′min5Pa/P′max10Pa,becomes−Negativepressuresetting: P′min−5Pa/P′max−10Pa

Δproom

Setpoint[Y]

Positive pressure

Tool/Bus:Operatingmode

Setpoint[Y]

Actual value [U5]

100%damperposition

Positive pressure

Negativepressure


Δproom

Δproom



Diagram


6


Analogue control [Mode 2...10 V]–Stepmode:damperCLOSED/P′min/P′max


Explanations/notes– Priority control p. 71 – Connection z1/z2 p. 61–Sensorintegrationbusmode p.61– VRP-M replacement in existing MP-Bus system: Seeseparateinstructions


1 2 3 5 6 7 8 9 10 11 12 13 14 15 16

1 2 3 5 6 7 8 9 10 11 12 13 14 15 16

AC/DC 24 V

min

.m

ax.

min

.m

ax.

A

B

1 2 3 5 6 7 8 9 10 11 12 13 14 15 16

1 2 3 5 6 7 8 9 10 11 12 13 14 15 16

AC/DC 24 V


MP

1)

A

B

1 2 3 5 6 7 8 9 10 11 12 13 14 15 161 2 3 5 6 7 8 9 10 11 12 13 14 15 16B

A

1 2 3 5 6 7 8 9 10 11 12 13 14 15 16

AC/DC 24 V AC/DC 24 V

C C

C

B

A

C

GND

D−D+

Control0/2...10V

Control0/2...10V

Feedback

Feedback

Feedback

Feedback

Feedback

FeedbackDamperCLOSED

DamperCLOSED

MP-Bus


Control0/2...10V

Hybrid mode

FeedbackU0/2...10V

Subjecttotechnicalmodifications

Parameter and tool overview for VAV unit <A> Applica-tion Tool

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SNactuator xxxxx-xxxxx-xxx-xxx Serialnumberoftheconnectedactuator r – –



r/w r/w – E






V′max m3/h/l/s/cfm(ZTH%) V′max -operatingvolumetricflow20…100%V′nom

r/w r/w r/w

V′min m3/h/l/s/cfm(ZTH%) V′min - operatingvolumetricflow0…100%V′nom

r/w r/w r/w



r/w r/w – E

Function VAV/CAV/position control Control function r/w r/w – E


OFF VAV: secondary circuit room-pressure cascade

r/w r/w – E


Setpointoffset 0% VAV:±5%compensationETAunit(roombalance)

r/w r/w – E

ReferencesignalY 2...10V/0...10V/adjustable SettingformodulatingcontrolV′min…V′max r/w r/w – E

Parameter and tool overview for room-pressure bypass damper <C>Applica-tion Tool

Authori-sation

Parameter/function Unit/value Function/description/(area) RP

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Δp′nom Pa NominalvalueΔpRP[5…75Pa] r r r O




r/w r/w – E

Power-on behaviour Noaction/synch./ adaptation





P′max Pa(ZTH%) Δpstepmax.20…100%P′nom r/w r/w r/w

P′min Pa(ZTH%) Δpstepmin.0…100%P′nom r/w r/w r/w

Room-pressure mode Positive pressure/negative pressure

Room operating mode positive [+]/ negativepressure[−]

r/w r/w – E

Application area Exhaustair/supplyair Mounting location of the bypass damper r/w r/w – E


OFF in connection with the room-pressure cascade

r/w r/w – E


ReferencesignalY 2...10V/0...10V/adjustable SettingformodulatingcontrolP′min…P′max r/w r/w – E



6


Explanations/notesReference A pressure-stable environment is a prerequisite for measurementfor thereferencemeasuringpoint[−]connection,asthishas the[−]connection a direct influence on the room-pressure control.

Anypressurefluctuationofthereferenceistransmitted to the room to be controlled. A pressure-controlled anteroomasa referencemakes reliable room-pressurecontrol impossible.

An environment isolated from the ventilation system – no pressure-controlled or volume-controlled rooms – provides this prerequisite.


as possible.

7

Subjecttotechnicalmodifications


Page

Brief description52

Principle diagram

Function diagram 53

Device selection 55

Diagram 56

Parameter and tool overview 58-60

Volumetric flow and room-pressure cascade control [RPC]VRU-D3-BAC/VRU-M1-BAC, VRU-M1R-BAC

7

Brief descriptionRoom-pressurevolumetricflowcascadecontrolconsistingof<A>Room-pressurecascadecontroller:VRU-M1R-BAC[RPC]−75...75PaVolumetric-flowcascadecontroller:VRU-D3-BAC/VRU-M1-BAC[VAV]<C>Volumetric-flowcontroller:VRU-D3-BAC/VRU-M1-BAC[VAV]

Volumetric flow and room- pressure cascade control [RPC]

Principle diagram


A

BC

-+

S1 YY

SUPunitVAV/CAV

Room-pressure cascadePrimary control loop

ExtractairVAVunitSecondarycontrolloop

Volumetricflowsetpoint


Referencepoint[−]

U5

Ventilationsystemswithdefinedpositiveornegativeroompressureinroomswith low leakage rates. Tight rooms place higher demands on the control because the room leakage is too low, which means that the usual volumetricflowtolerancescannotbecompensated.Thisplaceshighdemandson the control equipment. For this purpose, the VAV unit is operated with an additional room-pressure controller <C> as a so-called room-pressure volumetric-flowcascade.–RoomtightnessclassaccordingtoVDI2083-19;Class1

Thecurrentlyrequiredairexchangerate(roomtemperature,airquality,etc.)isswitched to the two VAV controllers and <C>. In addition, the output signal of the room-pressure controller <A> [primary control loop] is switched to the VAV controller [secondary control loop]. The volumetric flow of the VAV controlleriscorrectedby±20%tomaintainthedesiredroompressure.Duetothe limited influenceof the roompressureon the extract air volumetric flowcontroller,theinfluenceislimitedwhenthedoorisactuated.Thedamperisnotmovedtotheendpositionandminimisestheinfluencebyclosingthedoor.

Function diagram

7

Option– Changeover operation: positive/negative pressure

<A> Primary control-loop room pressure– Positive pressure

50 Pa

0 Pa

–50 Pa

0 100%

∆p < w ∆p = w ∆p > w

+ 4.0

6.0

– 4.0

U50 100%

a) V'momb) ∆p@V'momc)

0 100%

V'm

in (<

V'm

ax)

20%

V'max

V'min

100% V'nom

0 100%

V'm

in (<

V'm

ax)

20%

V'max

100%

50 Pa

0 Pa

–50 Pa

0 100%

V'min

P'max

P'nom P'max

P'nom

P'min

P'nom–

P'min– P'max

–

P'min

V'm

ax (>

V'm

in)

V'nom

V'm

ax (>

V'm

in)

Δproom

Volumetricflow

Volumetricflow/Δp/position

Setpoint[Y]

Setpoint[Y]

Actual value [U5]

Positive pressure


Setpoint[Y]

Actual value [U5]

Room pressure

100%damperposition

Positive pressure

Negativepressure


Δproom

Volumetricflow

Cascade signal [V]

 Primary control-loop VAV-unit extract air

Control:Y/bus(setpoint,inputS1)

Feedback [U5] (also in bus mode)Cascade signal [6...±4 V]

<C> VAV mode: Y/bus (setpoint)

Feedback [U5]/bus (actual value)

Rang

e

Rang

e

Rang

e

Rang

e

Requirements (positive and negative room-pressure applications)– Room-pressure controller <A> Room-pressure cascade controller,

VRU-M1R-BAC 1),sensorrange−75…75Paapplication [room pressure] Application area: [extract air/supply air] Room-pressurecascadeparameter:[ON]

– Measurement signal Measurement room: cables<A> Connectpressurelineto(+)

Reference point: Connectpressurelineto(−)

–VAVunit VAVunit–volumetricflowcascade, VRU-D3/M1-BAC Application: [VAV] Room-pressurecascadeparameter:[ON]

– VAV unit <C> VAV unit – application: [VAV], VRU-D3/M1-BAC Application: [VAV] Room-pressurecascadeparameter:[OFF]

1) Restrictions – MP-Bus 1) Thecascadepressurecontroller[A]cannotbeintegratedinto

an MP-Bus system.– Hybrid mode 1) In hybrid mode, the U5 signal is not available for the cascade

pressure controller <A>.–SensorinputS1 SensorinputS1isnotavailableforthecascadevolumetric

flowcontroller[B].

Room-pressure – Operation mode (positive/negative pressure)If necessary, the room pressure can be switched from positive to negative pressure(pressurelinesremainunchanged!):– Analogue control/MP-Bus Belimo Assistant App–Modbus/BACnet BelimoAssistantAppor"OperatingMode"

commandControl function room-pressure cascade controller <A>–P′min Room-pressure setpoint 1–P′max Room-pressure setpoint 2–Applicationarea Extractair/supplyair– Room-pressure mode Positive/negative pressure

VAV control functions <C>–V′min...V′max Air exchange rate, CAV step mode or VAV

modulatingcontrolV′min...V′max

Localoverride(z1/z2)–Room-pressurecontroller<A>P′max –VAVcontroller,<C> V′max/damperCLOSED/damperOPEN/motor

stop

Control –Analogue0…10V/2…10V,Modbus2), BACnet 2), MP-Bus 3)2) Hybrid mode possible 3)Thecascadepressurecontroller<A>cannotbeintegratedintotheMPsystem.

Device selection <C> VAV unitsProduct type from Belimo Function Sensor/actuator characteristic Field of application SUP unit ETA unit

i)VariantΔpsensor:D3flow(dynamic)

VRU-D3-BAC VAV controller extract air [cascade]

Δpsensor,integrated D3flowsensor Comfort

VRU-D3-BAC VAV controller supply air <C> Δpsensor,integrated D3flowsensor Comfort

ii)VariantΔpsensor:M1diaphragm(static)

VRU-M1-BAC VAV controller extract air [cascade]

Δpsensor,integratedM1 diaphragm sensor

ComfortPolluted air

VRU-M1-BAC VAV controller supply air <C> Δpsensor,integratedM1 diaphragm sensor

ComfortPolluted air


NF/SF24A-VST Rotary actuator,mechanical fail-safe

10/20Nm,120s,spring20s All ranges



NKQ24A-VST Rotary actuator, very fast running electrical fail-safe

6Nm,4s All ranges

7

Device selection <A> room-pressure cascade controllerProduct type from Belimo Function Sensor/actuator characteristic Field of application SUP unit ETA unit

VRU-M1R-BAC Room-pressure cascade controller <A>

ΔpsensorM1diaphragm−75...75Pa

ComfortPolluted air

DiagramAnalogue controlRoom-pressurecascade P′minconstantΔpVolumetricflow [mode0...10/2...10V]–Operatingvolumetricflow V′min...V′max

1 2 3 5 6 7 8 9 10 11 12 13 14 15 16

AC/DC 24 V

AC/DC 24 V

9 10 11 12 13 14 15 16

1 2 3 5 6 7 8 9 10 11 12 13 14 15 16

1 2 3 5 6 7 8 9 10 11 12 13 14 15 16

1 2 3 5 6 7 8 9 10 11 12 13 14 15 16

1 2 3 5 6 7 8 9 10 11 12 13 14 15 16

1 2 3 5 6 7 8 9 10 11 12 13 14 15 16

AC/DC 24 V

1 2 3 5 6 7 8 9 10 11 12 13 14 15 16

AC/DC 24 V

AC/DC 24 V

MP-Master MP

1 2 3 5 6 7 8 9 10 11 12 13 14 15 16

A

B 1 2 3 5 6 7 8

C

A

B

C

A

B

C

GND

D−D+

GND

D−D+

GND

D−D+

Modbus RTU, BACnet MS/TPRoom-pressurecascade P′minconstantΔpOperatingvolumetricflow V′min...V′max

–Operatingvolumetricflow V′min...V′max

Note:Inhybridmode,thefeedbacksignalisnotavailablefortheroom-pressure controller <A>.

MP-BusRoom-pressurecascade P′minconstantΔpVolumetricflow V′min...V′max

Note:Theroom-pressurecontroller<A>cannotbeintegratedintothe MP-Bus system.

Room-pressure cascade primary control loop– VRU-M1R-BAC

VAV unit secondary control loop– VRU-D3-BAC– VRU-M1-BAC

Room-pressure cascade primary control loop– VRU-M1R-BAC

Room-pressure cascade controller– VRU-M1R-BAC



Feedback

Volumetricflowcontroller– VRU-D3-BAC– VRU-M1-BAC


Volumetricflow controller– VRU-D3-BAC– VRU-M1-BAC

Volumetricflow controller– VRU-D3-BAC– VRU-M1-BAC

Note:SensorinputS1isoccupiedbythecascade signal.

Note:SensorinputS1isoccupiedbythecascade signal.

Control0/2...10VHybrid mode

Hybrid mode

Hybrid mode

FeedbackU0/2...10V

Explanations/notesReference A pressure-stable environment is a prerequisite for measurementfor thereferencemeasuringpoint[−]connection,asthishas the[−]connection a direct influence on the room-pressure control. Any

pressurefluctuationofthereferenceistransmittedtotheroom to be controlled. A pressure-controlled anteroom as a reference makes reliable room-pressure control impossible.

An environment isolated from the ventilation system – no pressure-controlled or volume-controlled rooms – provides this prerequisite.


as possible.

VAV control It is recommended that the two VAV controllers and a master controller- <C> be operated in a parallel circuit and not in a sequential circuit (master controller- sequential controller follower controller). Sequential circuits are not permitted in this application.

Overridecontrols Override controls acting on the damper actuator ETAunit mustbeconnectedtotheVRUfortheETAunit.

Groundconnection Connectconnectingterminal1or6GND,respectively– Priority control p. 71 – Connection z1/z2 p. 61–Sensorintegrationbusmode p.61– VRP-M replacement in existing MP-Bussystem: Seeseparateinstructions VAV-Universal-VRU in

VRP-Mcompatibilitymode(MP)

7

Parameter and tool overview for room-pressure cascade primary control loop <A>Applica-tion Tool

Authori-sation

Parameter/function Unit/value Function/description/(area) RP

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Pressure controller – manufacturer parameters (OEM values – not variable)



Δp@V′nom Pa NominalvalueΔp(5...75Pa) r r r O

NFCinterface ON/OFF NFCCommunicationforappaccess r r/w – O



P′max Pa(ZTH%) ΔpstepP′max 20…100%P′nom r/w r/w r/w

P′min Pa(ZTH%) ΔpstepP′min 0…100%P′nom r/w r/w r/w

Room-pressure mode Positive pressure Positive(+)/negativepressure(−) r/w r/w – E

Application area Exhaustair/supplyair Mounting location of the control/bypass damper

r/w r/w – E


ONONfast

ON:cascadefunctionactivatedONfast:activateswithVAVfastrunner

r/w r/w – E


ReferencesignalY 2...10V/0...10V/adjustable SettingformodulatingcontrolP′min...P′max r/w r/w – E

Parameter and tool overview for VAV unit secondary control loop Applica-tion Tool

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Range of rotation Adapted/programmed Actuator adapted/programmed 30...95°

r/w r/w – E



NFCinterface ON/OFF NFCCommunicationforappaccess r r/w – O



V′max m3/h/l/s/cfm(ZTH%) V′max-operatingvolumetricflow 20…100%V′nom

r/w r/w r/w

V′min m3/h/l/s/cfm(ZTH%) V′min-operatingvolumetricflow 0…100%V′nom

r/w r/w r/w


Altitude of installation 0m Compensatesvolumetricflowvalueatsetaltitudeofinstallation(abovesealevel)

r/w r/w – E

Function VAV/CAV Control function r/w r/w – E


ON VAV: secondary circuit room-pressure cascade

r/w r/w – E


Setpointoffset 0%(mustbe0%!) VAV:±5%compensationETAunit(roombalance)

r/w r/w – E

ReferencesignalY 2...10V/0...10V/adjustable SettingformodulatingVAVcontrolV′min…V′max

r/w r/w – E



7

Parameter and tool overview for opposite VAV unit <C> Applica-tions Tool

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V′nom m3/h/l/s/cfm Volumetricflownominalvalue




Range of rotation Adapted/programmed Actuator adapted/programmed 30...95°

r/w r/w – E



NFCinterface ON/OFF NFCCommunicationforappaccess – O



V′max m3/h/l/s/cfm(ZTH%) V′max-operatingvolumetricflow 20…100%V′nom

r/w r/w r/w

V′min m3/h/l/s/cfm(ZTH%) V′min-operatingvolumetricflow 0…100%V′nom

r/w r/w r/w


Altitude of installation 0m Compensatesvolumetricflowvalueatsetaltitudeofinstallation(abovesealevel)

r/w r/w – E

Function VAV/CAV Control function r/w r/w – E


OFF(mustbeOFF!) VAV: secondary circuit room-pressure cascade

r/w r/w – E


Setpointoffset 0%(mustbe0%!) VAV:±5%compensationETAunit(roombalance)

ReferencesignalY 2...10V/0...10V/adjustable SettingformodulatingVAVcontrolV′min…V′max

Feedbacktype Volumetricflow/Δp/ oosition

Volume/Δp/damperposition r/w r/w – E

FeedbackU 2...10V/0...10V/adjustable SettingUsignal




8


Page

Brief description62

Principle diagram

Diagram63

Sensorintegration

ConnectionVRU-D3-BAC/VRU-M1-BAC/VRU-M1R-BAC

8



Brief descriptionVRU-...-BAC – Connection and basic functions

Connection

Principle diagram


Overridecontrolz1/z2,seepage69

Control: analogue/bus24 VAC/DCSensorintegration(bus)

Explanations/notesSafetyrequirements Onlyauthorisedspecialistsmaycarryoutinstallation.All

applicable legal and government agency regulations must be complied with during use.

Connection via an isolating transformer.

Overridecontrolsz1/z2 Connection and priority control, see page 69

Diagram

Analogue control [Mode 0...10/2...10 V]– Modulating operation: min...max.

Analogue control [Mode 2...10 V]–Stepmode:damperCLOSED/min./max.

1) OtherMPdevices(total8)z1/z2 see page 69 for connection and priority control

1 2 3 5 6 7 8 9 10 11 12 13 14 15 16

AC/DC 24 V

1 2 3 5 6 7 8 9 10 11 12 13 14 15 16

AC/DC 24 V

AC/DC 24 V

AC/DC 24 V

MP-MasterMP

GND

D−D+

1 2 3 5 6 7 8 9 10 11 12 13 14 15 161 2 3 5 6 7 8 9 10 11 12 13 14 15 16

1)

min

.m

ax.

MP-Bus

Control0/2...10V

Feedback

FeedbackDamperCLOSEDNote:mode2...10V

Y:<0.3V [damperCLOSED]Y:2...10V modulatingcontrol[min...max.]

Sensor integration (Modbus, BACnet, MP-Bus)Connection of passive sensorse.g.Pt1000/Ni1000/...

Connection of active [email protected]°C

Connection of the switching contacte.g.Δpmonitor

Passive sensor Active sensor

Possiblevoltageranges:0...32V (resolution30mV)

Switchingcontacts:theswitchingcontact must be able to accurately switch a current of 16 mA at 24 V.

9 10 11 12 13 14 15 16 9 10 11 12 13 14 15 16 9 10 11 12 13

∆p

14 15 16

0...10 V

8


Control0/2...10V

Hybrid mode

FeedbackU0/2...10V


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Page

Brief description66

Principle diagram

Function

67Advantages/disadvantages

Recommendation

Diagram 68

SUP/ETA unit in conjunctionVRU-D3-BAC/VRU-M1-BAC

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Brief descriptionNetwork of SUP and ETA units, jointly controlled by building management technology/room controller/CAV circuit

SUP/ETA unit in conjunction

Principle diagram

A RC B

SUPUNIT

Y YReference signal

Building management technology/room controller

ETAUNIT

SUP/ETAparallelcontrol

A BRC

SUPUNIT

Y U5 Y

Master controller

Follower controllerReference signal

Sequencesignal

Building management technology/room controller

ETAUNIT

Sequentialcircuit




Advantages/disadvantagesParallel control Sequential circuit

+Simpleplanning/ordering/installation/commissioning.−IdenticalsettingoftheoperatingvolumetricflowforSUPand ETAunits.

+Thetwounitsareinterchangeablefromacontrolengineeringpoint of view.

+Inletpressureinfluencesonthemastercontrollersideare "supported" by the follower controller.

+Theoperatingvolumetricflowissetonthemastercontroller;thefollower controller follows the setting automatically.

−Complicatedhandlingofordering,installation,wiring.−IftheSUPandETAunitsareswitchedduringinstallation,thentheoperatingvolumetricflowsettingsV′min...V′max must be adapted on both units and the signals must be corrected by adapting the wiring.

−Recognitionandrectificationofsystemerrors(SUP/ETAunitsswitched,wiringerrors)requiresexpertknow-how.

Recommendation

In practice, parallel circuits have proven to be much easier than sequentialcircuits.IfmonitoringintheSUPand/orETAductisrequired, this can be implemented much more easily and comprehensively with the bus systems commonly used today.

FunctionParallel control Sequential circuit

With parallel control, the reference signal of the higher-level room automation(buildingmanagementtechnology,roomtemperature orairqualitycontrol,CAVsteps)iswiredinparalleltotheVAV controllersoftheSUPandETAunit(connectingterminal3-Y).Forevenroombalance,theoperatingvolumetricflowsettingsV′min...V′max of both VAV units are set to identical values.Ifnecessary,theroom-pressurebalancecanbeadjustedwiththe"SetpointOffset"parameter.

Theoperatingvolumetricflowissetonthemastercontroller,thefollower controller follows the setting automatically. In a sequential circuit,thefollowercontrollerfollowsthecurrentvolumetricflowofthemastercontroller.Undersupplybythefanisdetected(e.g. unfavourablesimultaneityfactorsatfanfullload),andtheroom-pressure balance is maintained.For this purpose, the reference signal of the higher-level room auto-mation(buildingmanagementtechnology,roomtemperatureorairqualitycontrol,CAVsteps)iswiredtothemastercontrollerunit(connectingterminal3-Y).Thecurrentvolumetricflowofthe mastercontroller(connectingterminal5-U)servesasthe referencevariableofthefollowercontrollerunit(connectingterminal3-Y).Theoperatingvolumetricflowisusuallysetonthemastercontroller;thefollowercontrollerissetforthispurpose(foridenticalnominaldiameterorV′nom)atV′min0%/V′max100%.With different unit sizes, the setting on the follower controller is:V′min0%/V′max=V′max of the master controller. Ideally, the master controller is placed on the more important side of the system (SUPorETA).

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Diagram




CAV steps see page 61

Overridecontrols The override commands must be wired to both VAV z1/z2 controllers.

Connection z1/z2 see page 61

Priority control see page 71

Parallel controle.g.VAVmode:V′min/V′max

Sequential circuite.g.VAVmode:V′min/V′max

AC/DC 24 V

1 2 3 5 6 7 8 9 10 11 12 13 14 15 16

1 2 3 5 6 7 8 9 10 11 12 13 14 15 16

A

RC

B

AC/DC 24 V

1 2 3 5 6 7 8 9 10 11 12 13 14 15 16

1 2 3 5 6 7 8 9 10 11 12 13 14 15 16

A

RC

B


Feedback


Feedback

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Page

Brief description

70Principle diagram

Diagram

Function71

Priority control

Local override control z1/z2 Priority controlVRU-D3-BAC/VRU-M1-BAC/VRU-M1R-BAC

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Brief descriptionLocaloverride-inputz1/z2Description of the priorities and the interaction of the individual regulation and control functions

Local override control z1/z2 Priority control

Diagram

9 10 11 12 13 14 15 16

Dampe

rOPE

N- M

otor

sto

pm

ax.

- Dampe

rCLO

SED

Principle diagram

Control: analogue/bus

Overridecontrolz1/z2


FunctionThetwoinputsz1/z2areavailableforlocalinterventionorhigher-levelcontrolcommands. The interaction of the control and setpoint signals for each operating mode is shown in the table below.

Priority control

Prio

Analogue operationModulating 0/2…10 V: min…max.

Analogue operationStep mode: Damper CLOSED/min./max. MP-Bus Modbus BACnet

Hybrid mode (Modbus/BACnet)

1 z1 z1 z1 z1 z1 z1

2 z2 z2 z2 z2 z2 z2

3 a)Adaptationb)Synchronisation

a)Adaptationb)Synchronisation

Bus Watchdog Bus Watchdog Bus Watchdog Bus Watchdog

4 Setpointmin...max. Stepsdamper CLOSED/min./max.





5 – – Ysteps Damper CLOSED/min./max.

Bus override Bus override Bus override

6 – – Bus override Bus setpoint: min./max.

Bus setpoint: min...max.

YHybridsteps: Damper CLOSED/min./max.

7 – – Bus setpoint: min...max.

– – YHybridmodulating: Damper CLOSED/min./max.

Exception: application room-pressure volumetric flow cascade controlThe functionsdamperCLOSED/damperOPEN/(motorstop)arenotavailable with the room-pressure cascade controller <A> and must be connected to the VRU-D3-BAC/VRU-M1-BAC of the VAV unit extract air .Seepage51




CAVsteps ConnectionY,seepage61

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Page

Brief description 74

Commissioning room/duct pressure applications – Controller setting

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A room or duct pressure regulation requires on-site adaptation of the control to the control section during commissioning of the system. Unbalanced control loops lead to malfunctions and increased wear of the actuators.Twoparametersareavailabletothecommissioningtechnicianforadaptationof the controller,

Twoparametersareavailabletothecommissioningtechnicianforadaptationof the controller, – Controller sensitivity – to adapt the controller speed to the control section–Controllerdeadband–thecontrolleroperatesassoonasthemeasuredΔp

value is outside the deadband

ThecontrolleroperatesassoonasthemeasuredΔpvalue isoutsidethesetdeadband (setpoint +/- deadband). This function protects the actuator fromcontinuousmotion(lifetime)andhelpsmaintainthepressurebalanceinstableconditions. If, for example, the Δp actual value falls below the setpoint, the actuator starts to correct the deviation after the value falls below the lower deadbandlimit.Todoso,thepressurecontrollerchangesthedamperpositionuntil the actual value corresponds to the setpoint.

Room pressure [VRU-M1R-BAC]Recommendedactuationtime:2.4...120s

Controller sensitivityIn tight rooms- low leakageratesand/orhighairexchangerates - itmaybenecessarytodampen(brake)thesensitivityofthecontroller toensurestableoperation.Toomuchdampingofthecontrol loop, inturn,cancausethecon-troller to become too slow to compensate for disturbances within a reasonable time.Theroompressuresetpointmustbeselectedsuchthattheroompressurebalance does not, unintentionally, shift to negative pressure or overpressure.

Range Function

0.1…10 Default=1.00.1 10timesslowerthannormal10 10timesfasterthannormal

Controller deadbandThesettingmustbeselectedsothattheactuatordoesnotruncontinuously.Deadbandsettings<5±Parequirepreciseverificationthatthesystemisrunningstable.

Range Function

±1…10Pa Default = ±5 Pa

Commissioning room/duct pressure applications – Controller setting



Duct pressure [VRU-D3-BAC/VRU-M1-BAC]Recommendedactuationtime:120sIn order to operate the downstream control devices in a stable manner, the duct pressurecontrol isnormallyaslowcontrol loop.Thedefaultsettingwillworkwell for line pressure control systems with connected volumetric flow controllers(e.g.VAV-Compact).Ifmechanicalconstantvolumetricflowcontrollers(CAV)areused,thecontrollerspeedcanbeincreasedslightlyifnecessary.

Controller sensitivityThis parameter serves to adapt the controller speed to the downstream consumers.

Range Function

0.1…10 Default=1.00.1 10timesslowerthannormal10 10timesfasterthannormal

Controller deadbandThedeadbandmustbesetsothattheactuatordoesnotcontinuouslymove.

Range Function

±1…10%ofP'nom Default=±5%ofP'nom

Duct pressure control with VRU-D3-BAC:Thepressuredropinthemeasurementsignalcablegeneratesameasuringer-rorofmaximum2.5%.UseoftheVRU-M1-BACisrecommendedforappli-cati-onswithmeasurementsignalcables>20m.

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BELIMO Automation AGBrunnenbachstrasse 1, 8340 Hinwil, Switzerland+41 43 843 61 11, [email protected], www.belimo.com

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As the global market leader, Belimo develops innovative solutions for the regulation and control of heating, ventilation and air-conditioning systems. Actuators, valves and sensors represent our core business.

With a consistent focus on customer value, we deliver more than just products. We offer you a complete product range of actuator and sensor solutions for the regulation and control of HVAC systems from a single source. At the same time, we rely on tested Swiss quality with a 5-year guarantee. Our worldwide representatives in over 80 countries guarantee short delivery times and comprehensive support through the entire product life. Belimo does indeed include everything.

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Building Management System STP VAV VAV

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