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4. VAV-3Product Range 2000/2001BELIMO VAV-Control

Actuators for heating,ventilation, air-conditioning

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Products no longer available

GeneralDemand-related air distribution 2

VAV-ControlStandard interfaces 4Demand-related control without DDC 5Individual-room temperature control 6DDC systems with VAV controllers 7

VAV-UniversalSupply and exhaust VAV-Boxes 8–9

Setting parameters 10

Ratio control 11

ApplicationsVAV-Control 12–13VAV-Compact 14VAV-Universal 15

1

Contents

Note:The main purpose of the schematicdiagrams in this documentation is toillustrate the functionality of our products.Actual cable lists and electrical circuitdiagrams must be prepared from the da-ta sheets and other information providedfor individual products. The technical information and statementsare based on the current status of tech-nological development.

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Demand-related air distribution

Diagrammatic representation of a heating, ventilating and air-conditioning system

2

Specific individual-room control for greater comfort and...

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User-friendly

The user can adjust the air-conditions inhis/her room according to need.

Air quality

Variable control of air flow rate ensuresoptimum air quality however much isbeing used.

Flexible range of products

The carefully chosen range of productsensures that there is always the rightproduct available for every type of appli-cation:

Terminal controlSection control/air distributionCombination with air/water systems

Economic

The consumption-dependent method ofcontrolling the air flow ensures that onlythe right amount of air needed for opti-mum air quality is actually supplied.

The proportion of ambient air added canbe adjusted so that only an absolute mi-nimum amount of extra air has to beheated, cooled or humidified.

Specific section control ensures thatalways the same amount of air is dis-tributed regardless of any fluctuations insystem pressure.

In partnership with manufacturers

Belimo specialises in the design, devel-opment and manufacture of controlequipment and actuators for air volumecontrollers. Belimo designers work close-ly with the manufacturers of air volumecontrollers so that Belimo products aretailored precisely to different needs.

This allows manufacturers to adjust theirequipment accurately for the specifiedvalues of air volume before it leaves thefactory and to accept responsibility forthose values as well as the proper func-tioning of the whole unit. This is whyBELIMO VAV-Control is only supplied tooriginal equipment manufacturers.

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... economic use of energy

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Belimo products

Supply air

Exhaust air

Controller

VAV-Control

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VAV-Control

Clear interfaces and division of responsibility

Belimo’s variable air volume control sys-tems VAV-Universal and VAV-Compactemploy a standard interface in the formof a 0...10 V / 2 ...10 V signal. This meansthat there are no problems in connectingup to most types of controller currentlyavailable on the market.

Responsibility for maintaining the re-quired values of air flow rate and the maximum permitted noise levels lies withthe manufacturer of the terminal controldevices. If his air volume controllers areconceived as independent, preset aircontrol actuators, there will be no diffi-culty in using them in combination withordinary DDC (Direct Digital Control) sys-tems or analogue control systems.

4

Versatility thanks to standard interfaces

Linear standard signals

Measurement of volumetric flow is basedon the use of a differential-pressure sen-sor which usually takes the form of anorifice plate, a venturi nozzle or a mea-suring cross installed in the air duct.

The correlation between differential pres-sure and volumetric flow can be de-scribed by means of the equation:

.

The controller converts the measuredsignal of differential pressure accordingto the above equation to a signal that isproportional to the volumetric flow. Thisoutput signal is available at Terminal 5 ofthe controller in the form of a 0...10 V /2...10 V signal.

It allows a variety of tasks in connectionwith various applications to be performedwith great ease, for example:

Display of volumetric flowMaster/Slave controlAcquisition of power consumptionPlant monitoringCommissioning

·

•••••

The analogue sensor signal is not proportional tothe volumetric flow. It has to be converted to a line-ar actual-value signal in the air volume controller.

The signal conditioning

This is the only way to issue standardised refer-ence signals for the volumetric-flow setpoint sothat the actual value can be controlled and readaccurately.

MvUv

V·

w

X (U5 )

(V)

10

8

6

4

2

0

0 100 (%)

V·

20 40 60 80V·

X (U5 )

∆ p

y

·

(Working range 0...10 V / 2...10 Vadjustable)

Legend to equation:V = Volumetric flowk = Geometry-related constant of the baffle

device (differential-pressure sensor,dimensions, etc.)

∆p = Differential pressure= Density of the flow medium

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VAV-Control

Demand-related ventilation

The example opposite shows a simplebut efficient method of demand-relatedventilation using BELIMO VAV-Controlsystems. This application is primarilysuitable for when combined air/watersystems are being used because only thequality of the air is controlled, not thetemperature (so no transfer of energy). Amanual control switch is provided in theroom for the occupant to adjust accord-ing to his or her needs.

UnoccupiedWhen a room is not being used, the con-trol switch must be set to the “Unoccu-pied” position. In this position the flow ofair is reduced to a minimum; the actualvalue to which it is reduced can be pre-set at the VAV controller.

OccupiedWhen someone wishes to use the room,the control switch must be set to the“Occupied” position. The volumetric flowwill then be increased to a pre-definedvalue that can also be preset at the VAVcontroller – which will ensure optimumair quality for normal usage.

VentilateShould the air in the room become verystale due, say, to excessive smoking, thecontrol switch can be set to the “Venti-late” position so that the air flow rate isincreased to an again-preset maximumvalue.

VariantsInstead of a manual switch it is also pos-sible to employ a proximity switch whichchanges automatically from “Occupied”and “Unoccupied” and vice versa. An-other option is for the “Ventilate“ modeto be triggered through a time-delayswitch so that maximum ventilation doesnot remain on permanently.

The room exhaust air is linked to the sup-ply air under slave control in order to en-sure balanced pressure conditions in theroom and so avoid draughts.

5

Demand-related control without DDC

Note on circuit wiringWhenever possible, always run the U5 signal (actual value of volumetric flow) to an easily accessible terminal(in the electrical cubicle, room controller, etc.). It is needed for connecting the ZEV Adjuster (refer to the doc-umentation on the connection and use of the ZEV Adjuster).

RoomSUPPLY Master EXHAUST Slave

UnoccupiedOccupiedVentilate

TM

M

AC 24 V

EXHAUST Master~ w1 U5

1 2 3 5

SUPPLY Master

1 2 3 5~ w1 U5

Schematic diagram

Variant with VAV-Compact

NMV... NMV...

VMIN˙

VMAX˙

A B CA = Unoccupied ( )B = Occupied (intermediate stage)C = Ventilate ( )

AC 24 V

EXHAUST Master~ w1 U5

1 2 3 5

A B C

SG... 24

SUPPLY Master

1 2 3 54

1 2 3 5

~ w1 U5w2

~ y U5

Schematic diagram

Variant with VAV-Universal

VRD... VRD...

A = UnoccupiedB = OccupiedC = Ventilate

The air flow rate for the “Occupied”mode can be preset by means of theSG...24 reference setter.

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When BELIMO VAV-Control is used forsimple, temperature-sensitive individual-room control, the temperature controllerworks in conjunction with the VAV-Boxesindependently of any master control sys-tem that there might be.

The advantage of this is that retrofitting isvery easy. It is an especially importantfactor when the eventual partitioning anduses of rooms in a new building have notbeen decided during the constructionstage.

The required temperature and functionssuch as night reduction, ventilation, etc.can be preset by the occupants after-wards from the room thermostat.

In the example opposite the supply-airand exhaust-air boxes are connected inseries although they can also be con-trolled in parallel if necessary (see page8, Using supply and exhaust VAV-Boxes).

yh = “Heating” outputyk = “Cooling” outputt = TemperatureV = Volumetric flow

6

Simple individual-room temperature control by VAV-Control

VAV-Control


T

AC 24 V

AC 24 V

.V

NMV… / VRD...

SUPPLY Master EXHAUST Master

1 2 3 5

M M

NMV… / VRD...1 2 3 5~ w1 U5 ~ w1 U5

.V

Schematic diagram

T-controller

1 2 3~ y

t

V̇

ykyhVMAX˙

VMIN˙


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Incorporating BELIMO VAV-Control intoDDC systems provides maximum flexibil-ity. With their standard inputs and out-puts of 0...10 V and 2...10 V, the VAVcontrollers can be connected directly tomost commercially-available DDC controlsystems.

The DDC controller measures and con-trols all the important values for operat-ing the plant. The values of volumetricflow can be controlled according to avery wide range of criteria, e.g. accordingto the use of the building (night reduc-tion, night cool-down, etc.).

The actual-value signals (U5) perform anumber of valuable tasks, mainly con-nected with energy-saving: they allow theactual volume of each VAV-Box to be ac-quired at any instant so that the plantoperator is able to see and assess theconsumption of air in each individualzone. Using this information it is a verysimple matter to produce programs thatprovide optimum distribution of the airsupply.

Typical example of Master/Slave DDC – 0...10 V DC control

Using only one modulating output (0...10 VDC), VAV controllers can be used forcontrolling the supply air and the exhaustair through a “Master/Slave” arrange-ment. By feeding the slave’s actual-valuesignal back to the DDC controller it ispossible to monitor both the supply airand the exhaust air with only a single0...10 V input.

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DDC systems with VAV controllers

VAV-Control

Room

YSUP XSUP YEXH XEXH

DDC controller

SUPPLY EXHAUST

DC 24 V

AC 24 V

AC 24 VDC 24 V

DDC controller

.V

NMV… / VRD...

SUPPLY EXHAUST

1 2 3 5

M

NMV… / VRD...1 2 3 5~ w1 U5 ~ w1 U5

.V

Schematic diagram

M

AC 24 V

AC 24 VDDC controller

Output

.V

NMV… / VRD...

SUPPLY Master EXHAUST Slave

1 2 3 5

M M

NMV… / VRD...1 2 3 5~ w1 U5 ~ w1 U5

.V

DC 24 V

Schematic diagram

DC 24 V


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VAV-Universal

Using supply and exhaust VAV-Boxes

Supply and exhaust flow control:Master/Slave system

This system of control is used for:

Plants with air volume controllers inthe supply-air and exhaust-air systems that must work in seriesSupply-air and exhaust-air units of thesame sizeRatio control between supply air andexhaust air

The reference signal w from the tempera-ture controller is connected to the inputof the supply-air air volume controller(Master).The actual-value signal from the Masteris the reference signal for the exhaust-airair volume controller (Slave).

The ratio of V-Slave to V-Master is set with the VMAX potentiometer at theSlave Set VMIN Slave to 0%Override VMIN and VMAX should only beentered at the Master; “CLOSE” atboth Master and Slave

Supply and exhaust flow control:Parallel system

This system of control is used for:

Plants with parallel-connected airvolume controllers for supply air andexhaust air (both controlled from andwith the same reference variable)Supply-air and exhaust-air units ofvarious sizes and settings for mini-mum and maximum limit valuesDifferential control between supply airand exhaust airPlants with several supply-air and/orexhaust-air units

The reference signal w from the tempera-ture controller is connected in parallelwith the setpoint inputs of the VR... sup-ply-air and exhaust-air volume control-lers. The minimum and maximum limitvalues of volumetric flow must be set in-dividually for each controller.

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Note on circuit wiringWhenever possible, always run the U5 signal (ac-tual value of volumetric flow) to an easily accessibleterminal (in the electrical cubicle, room controller,etc.). It is needed for connecting the ZEV Adjuster(refer to the documentation on the connection anduse of the ZEV Adjuster).

Schematic diagram

AC 24 V

NMV 24–…

SUPPLY Master EXHAUST 2 Slave

1 2 3 5 NMV 24–…~ w1 U5

T-controller

1 2 3

1 2 3 5

EXHAUST 1 Slave

NMV… / VRD... NMV… / VRD...

NMV… / VRD...

Room

SUPPLY Master EXHAUST 1Slave

EXHAUST 2Slave

T

~ w1 U5

~ y ~ w1 U51 2 3 5

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Schematic diagram

AC 24 V

SUPPLY EXHAUST 2

1 2 3 5~ w1 U5

1 2 3 5

EXHAUST 1

NMV… / VRD... NMV… / VRD...

NMV… / VRD...

~ w1 U5

~ w1 U51 2 3 5

Room

SUPPLYEXHAUST 1

EXHAUST 2

T

1 2 3~ y

T-controller

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VAV zone control, supply and exhaust air

The arrangement shown in the exampleopposite uses several VAV controllers forthe supply air and one common control-ler for the exhaust air.

The controller in the common exhaust-airsystem is controlled by the actual-valuesignal of the volumetric flow sensor inthe common supply-air duct whichmeasures the variation in volumetric flowaccording to the load status.The volumetric flow of the zone air iscontrolled from the output of the temper-ature controller. Room-related overridessuch as VMIN, VMAX and “CLOSE” are ac-cepted automatically.

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VAV-Universal

Twin-duct mixing boxes with variablevolumetric flow

The control zones have a single mixingsection and separate VAV controllers inthe common supply-air and exhaust-airsystems.The room temperature controller firstthrottles the volumetric flow of cold airdown to the preset VMIN value (e.g. 50%).Mixing of the cold-air and warm-air flowsthen takes place. Thus, in the upperrange (cooling) the air flow rate is varia-ble and in the lower range (heating) it isconstant.

.

Schematic diagram

AC 24 V

M SUPPLY Master

1 2 3

T-controller EXHAUST Slave

~ w1

1 2 3 5~ w1 U5

1 2 3 5~ w1 U5~

1 2 3 8

NMV... / VRD...

NMV... / VRD...

Room

Tyk

SUPPLY Master EXHAUST Slave

yh

T

ykyh

M

ykyh

heating coolingt

VMIN 50%˙

100%

[V%]˙

yk

yh

Note on circuit wiringWhenever possible, always run the U5 signal (ac-tual value of volumetric flow) to an easily accessibleterminal (in the electrical cubicle, room controller,etc.). It is needed for connecting the ZEV Adjuster(refer to the documentation on the connection anduse of the ZEV Adjuster).

Schematic diagram

AC 24 V

SUPPLY

NMV... / VRD...

SUPPLY 2

SUPPLY 1

T-controller T2

T-controller T1U5

VRP...

NMV... / VRD...

NMV... / VRD...

EXHAUST

1 2 3~ w1 U5

1 2 3 5~ y~ w1 U5 ~ w1 U5

1 2 3 5

~ y1 2 3 5

~ y

1 2 3

1 2 3 5

Zone 1

Zone 2

.V

SUPPLY 1

SUPPLY 2

SUPPLY

T

T1

T

T2EXHAUST

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Setting parameters and modes of operation

100

0

20

40

60

80

DN 100DN 125

DN 160 DN 225%

.Vm3/h

.VNOM

100

30

(%)

80

0

2 4 6 8 10

40

30

50

60 70

80

90

100

[V] Working range 2...10 V

0

[V] Working range 0...10 V

2 4 6 8 10

The actuator will override and close thedamper if the setpoint for the minimumvolumetric flow has been set to 0%and the control signal attains thevalue.

VMIN.

VMIN.

VMAX˙VMIN

(% VMAX)

˙

˙

VMAX%

˙

10

0

20

30 40 50

60

70

8080

VMIN

% VMAX

˙˙

Suppressing seepage flowVRD2 < ca. 2 [Pa]VRP < ca. 1.5 [%] FS VFPNMV-D2 < ca. 2 [Pa]

Actual-value signal U5U5

[V DC]

0

2.0

10.0

0

DC 2…10 V

DC 0…10 V

.VNOM = 100%

Nominal volumetric flow VNOM

Energy consumption and noise consider-ations demand that the specific value ofvolumetric flow for each diameter of ductshould not exceed a certain maximum.With BELIMO VAV-Control the manufac-turer can calibrate his air volume control-ler to a maximum possible value of VNOM

before despatch from the factory. Thisproduces the versatile, linear actuator forvolumetric flow.The presetting of the units for a standardvalue of VNOM greatly simplifies and short-ens the procedures of manufacture(OEM), planning and installation or com-missioning, making a major contributionto cost-saving.

Rated volumetric flow VMIN and VMAX

The linear characteristic of the air volumecontroller facilitates the setting of the val-ues of rated volumetric flow for the plantby means of two potentiometers, a taskthat can be performed either at the fac-tory (OEM), during installation or duringcommissioning. VMAX is the upper limit value in relation tothe nominal volumetric flow. VMIN can beadjusted as a percentage of the set valueof .The actual-value output U5 is unaffectedby the settings of and .The reference signals w/z allow the set-point of volumetric flow to be varied with-in the preset limits either continuously orin steps.

Modes of operation

Multi-step constant operation via overrides:By means of simple override signals it ispossible, when necessary, to change thecontroller to different steps of operation.Accordingly, the controller then eithermaintains a constant value of rated vol-umetric flow for or or the meanof the two, or closes or opens the damperas demanded by the control signal.

Modulating:By means of the reference signal w(DC 0...10 V) it is possible to modulatethe volumetric flow between the limit val-ues and . The effective workingrange DC 2...10 V or DC 0...10 V can bepreselected. The override functions arealso active in the modulating mode andso can be used in almost any combina-tion.

Operating controls for mode and parameter settingThe NMV-D2 has no operating controlsother than the gearing disengagementpushbutton. The plant-specific operatingparameters and and the work-ing ranges can be preset using the ZEVAdjuster through the PP communicationsinterface U5.

VMAX·VMIN

·

VMAX·VMIN

·

VMAX·VMIN

·

VMAX·VMIN

·

VMAX·

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Master Slave

VNOM˙ = 1600 m3/h

= 1500 m3/h

Nom. size 200

VMAX˙

VNOM˙ = 2400 m3/h

= 1200 m3/h

Nom. size 250

VMAX˙

VMIN

% VMAX

˙˙

VMAX%

˙

10

0

20

30 40 50

60

70

8080

40

30

50

60 70

80

90

100

VMIN

% VMAX

˙˙

10

0

20

30 40 50

60

70

8080

VMAX%

˙

40

30

50

60 70

80

90

100


Master Slave

VNOM˙ = 1600 m3/h

= 1200 m3/h

Nom. size 200

VMAX˙

VNOM˙ = 2400 m3/h

= 1500 m3/h

Nom. size 250

VMAX˙

VMIN

% VMAX

˙˙

10

0

20

30 40 50

60

70

8080

VMIN

% VMAX

˙˙

10

0

20

30 40 50

60

70

8080

VMAX%

˙

40

30

50

60 70

80

90

100

VMAX%

˙

40

30

50

60 70

80

90

100

RoomVSUPPLY˙ VEXHAUST

˙

Positive pressure when VSUPPLY > VEXHAUST

Negative pressure when VSUPPLY < VEXHAUST

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Positive or negative room pressure

BELIMO VAV provides a simple means ofoperating systems with too much or toolittle volumetric flow (i.e. positive or neg-ative room pressure). A positive pressurewill prevent air, gases or vapour fromoutside entering a room and, similarly, anegative pressure will prevent air, gasesor vapour escaping from a room.Such positive and negative pressureconditions are very easy to produce withBELIMO VAV. Ideally, the VAV controllersshould be used in a Master/Slave arrange-ment, the controller with the smallervalue of nominal volumetric flow beingappointed Master. When both controllershave the same value of nominal volu-metric flow the one with the higher valueof VMAX should be appointed Master. The different pressure conditions can beachieved by making appropriate adjust-ments to VMAX at the Slave controller. Thesimple equation below should be usedfor determining the value of VMAX to beset at the Slave controller. The VMAX set-ting of the Master controller can be cal-culated from the following relationship:

vMAX% M = . 100

11

Ratio control

Example 2: Negative pressure in a roomis required brought about by 20% less airbeing supplied than exhausted. The con-troller with the smaller value of nominalvolumetric flow is appointed Master, theSUPPLY controller in the case of theadjacent example.

Example 1: Positive pressure in a roomis required brought about by 20% moreair being supplied than exhausted. Thecontroller with the smaller value of nomi-nal volumetric flow is appointed Master,the SUPPLY controller in the case of theadjacent example.Ascertain the value of VMAX in % that is tobe set at the Slave controller in order toproduce the 20% differential required.

Answer:

1200 m3/h · 1600 m3/h1500 m3/h · 2400 m3/h

Therefore the VMAX-potentiom. of theSlave controller must be set to 53%.

· 100 = 53%

VMAX S · VNOM M

VMAX M · VNOM S· 100vMAX S% =

Answer:

1500 m3/h · 1600 m3/h1200 m3/h · 2400 m3/h

Therefore the VMAX-potentiom. of theSlave controller must be set to 83%.

· 100 = 83.3%

vMAX S% = Value that must be set on the VMAX

potentiometer of the Slave controller

VMAX M = Max. volumetric flow in m3/h of the Master controller

VNOM M = Nominal volumetric flow in m3/h of the Master controller

VNOM S = Nominal volumetric flow in m3/hof the Slave controller

VMAX S = Max. volumetric flow in m3/h of the Slave controller

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VMAX Mi

VNOM M

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Legend to equations:V = Volumetric flowv = Mean velocityA = Area

V = Volumetric flowk = Geometry-related constant of the baffle

device (differential-pressure sensor, dimensions, etc.)

∆p = Differential pressure= Density of the flow medium

VAV-Control

12

The right measuring system for all applications

Measuring air velocity in the ductDue to the irregular flow profile, the mean air velo-city is not identical to that measured at a specificpoint; it must be corrected according to the mea-suring arrangement being employed.

Measuring methods used in the HVAC industry

Measuring differential pressureSpecific inlet flow conditions for the sensor andmean-value-forming devices such as measuringcrosses, etc. provide the standard of accuracyneeded by the HVAC industry.A flow of air encountering an obstruction exerts acorresponding pressure of resistance that is pro-portional to the square of the velocity.It is the resulting difference in pressure across thebaffle known as «differential pressure».Baffles come in a great variety of forms (orificeplates, nozzles, baffle rings, baffle bars, etc.). Staticor dynamic pressure sensors (diaphragm-type forstatic and flow-type for dynamic) are suitable formeasuring differential pressure.

V·

V = v · A·

∆p

V = k · √ ∆ p /·

v

A

ρ

Reliable and accurate measurement of differential pressure – the key toprecise control of volumetric flow

Several different methods have becomepopular for measuring volumetric flow.The differential-pressure method used byBelimo allows a good averaging mea-surement to be taken even when the inletflow conditions are unsatisfactory.

Dynamic differential-pressure measurement:Wide measuring range and high accuracy in conjunction with specificmakes of conventional differential-pressure sensorsStatic differential-pressure measurement:Suitable for contaminated air and special-purpose installations

Both methods of measurement can beused together in the same installation.Different VAV controllers with differentworking ranges can be used in parallel ifnecessary.

Measurement of differential pressureby dynamic flow probe

Precise, proven principle of thermo-anemometric measurement with temperature compensationUnaffected by contamination as themeasuring element is not in the air flowMeasurement unaffected by positionHigh accuracy of measurement – even in the low range of differentialpressure Pressure measuring range 3...300 Pa

•

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•

•

••

•

Measurement of differential pressureby static diaphragm sensor

Suitable for use with heavily contaminated or corrosive airMeasurement performed outside theair flowHigh accuracy of measurement –even in the low range of differentialpressurePressure measuring range 3...300 PaOther measuring ranges available

•

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VAV-Control

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The right equipment for all applications

Belimo VAV CompactA cost-effective combination of dynamicdifferential-pressure sensor, controller andactuator.The NMV-D2 is suitable for:

3-stage constant volumetric flow control including full shutoffModulating volumetric control for individual-room applications (0...10 V /2...10 V)

ZEV AdjusterThe ZEV Adjuster is suitable for use bycommissioning engineers or service tech-nicians in order to change values of VMIN

or VMAX in the system or to check the func-tion of the controller.

BELIMO VAV-UniversalSuitable for almost any application in theHVAC industry:

Two different methods of measure-ment that can be combined as necessary with four different types ofdamper actuatorSuitable for variable and constant volumetric flowControl by standard modulating signalsLimit values VMIN and VMAX adjustable atthe controllerOverride control of individual controllers or several at the same time

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•

•

•

•

•

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VRD2

VRP

LM24-V

NM24-V

AM24-V

GM24-V

AF24-VNMV-D2

ZEV


VAV-Compact

14

The combination of controller and actuator

BELIMO VAV-Compact NMV-D2This system is used with the widest pos-sible variety of VAV-Boxes and its keyfeature is its compactness. The dynamicpressure sensor, the controller and the 8 Nm damper actuator are combined intoa single unit.

ZEV AdjusterThe ZEV Adjuster can be used for editingor checking existing air volume control-lers already installed in plants; it can alsobe used for setting the VMIN and VMAX op-erating parameters and the 0...10 V /2...10 V operating modes. The resetfunction allows the original OEM valuesto be reset.

Block diagram

In the measuring section (sensor electron-ics and linearisation) the non-linear dif-ferential-pressure signal from the sensoris converted to a linear signal proportion-al to the volumetric flow. The signal is al-so available for other external uses. Theinput signal is conditioned in accordancewith the preset limit values to produce aninternal setpoint signal that is subse-quently compared with the actual value.The control signal for the actuator isformed from the difference between thesetpoint and the actual value.The smaller the system deviation, thelower the actuator speed.

D

A

+

–

M

+

–

12 ~

DCAC

5

3 w1

U5

Actual-value signal

Q

V

..

PP communication

Linearisation Reference value

Memory

ASICbrushless motorcontrol

µp Microprocessor

24 V power supply

Sensorelectronics

∆p Sensor

D

A

10

V.

2

0

zw1VMINVMAXL<–>R…

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15

The right answer for all applications

VAV-Universal

LM24-VThe smallest with a torque output of 4 Nm. Also with linear motion.

NM24-VThe most compact with a torque outputof 8 Nm.Covers the majority of applications. Aux-iliary switches (SN1/SN2) are available.

AM24-VThe newest with a torque output of 18 Nm.Can also operate the larger dampers andbe fitted with up to four auxiliary function(potentiometers/switches).

GM24-VThe powerful one with 30 Nm torque. Foroperating large dampers; with auxiliaryswitches (S1/S2) if necessary.

AF24-VThe spring-return actuator with a torqueoutput of 15 Nm.Used when a damper safety function isrequired. The pretensioned spring movesthe damper to the safe position in theevent of a power failure.

The key feature of this range of productsis its modular design. There are two dif-ferent methods of measurement availableto the manufacturers of VAV controllers.

The controllers can be combined withdamper actuators with a variety of torqueoutputs and functions. This allows themanufacturers of VAV-Boxes to offer

their customers a customised solution forany particular application.

Block diagram

In the measuring section (sensor electron-ics and linearisation) the non-linear dif-ferential-pressure signal from the sensoris converted to a linear signal proportion-al to the volumetric flow. The signal is al-so available for other external uses. Theinput signal is conditioned in accordancewith the preset limit values to produce aninternal setpoint signal that is subse-quently compared with the actual value.The control signal for the actuator isformed from the difference between thesetpoint and the actual value.The smaller the system deviation, thelower the actuator speed.

VRD2Controller with dynamic differential-pres-sure sensor.

2-stage constant volumetric flow control including full shutoffModulating control (0...10 V / 2...10 V / Type VRD2-L; 3-point / 0...20 V phasecut)The rated values of volumetric flow VMIN / VMAX can be set locally

•

•

•

VRP/VFPController with static differential-pressuresensor.

Suitable for contaminated air thanks toprinciple of static pressure measurement2-stage constant volumetric flow control including full shutoffModulating control (2...10 V / 0...20 Vphasecut)

•

•

•

. .

Speisung 24 V

Zwangssteuerung

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U5 5

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D

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Actual-value signal

Actuator signal

µp Microprocessor∆p Sensor Linearisation

Memory

Sensorelectronics

- VMIN- VMAX

- VNOM

– Mode

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10

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2

0

M

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VNOMReferencevalue

T

10 V6 V2 V

24 V power supply

i013

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Notes

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The worldwide leading actuator technology for all controlled devices in heating, ventilation and air-conditioning plants

Air applications Water applications

Damper actuators andspring-return actuatorsfor air control dampersare invaluable elementsof good HVAC systems.

Extra-strong safety ac-tuators for motorizingfire and smoke extrac-tion dampers help raisesafety standards inbuildings.

Air volume boxes –equipped with VAV-Control – ensure higherstandards of comfortfor the occupants ofair-conditioned singlerooms as well as savingenergy.

Rotary actuators forheating system mixingvalves and motorizedball valves ensure reli-able control of HVACwater systems.

Globe valves withMFT2 actuators alloweasy adaptation to theneeds of HVAC sy-stems.

BC

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