Type TVA

For extract air systems with demanding acoustic requirements

VAV terminal units for the extract air control in buildings with variable air volume systems and demanding acoustic requirements

  • Highly effective integral attenuator
  • Box style construction for the reduction of the airflow velocity
  • Electronic control components for different applications (Easy, Compact, Universal, and LABCONTROL)
  • Suitable for airflow velocities up to 13 m/s
  • Closed blade air leakage to EN 1751, class 4
  • Casing air leakage to EN 1751, class A


Optional equipment and accessories

  • Acoustic cladding for the reduction of case-radiated noise
  • Secondary silencer Type TS for the reduction of air-regenerated noise

VAV terminal unit, variant TVA 00134442_0


  • Application
  • Description

Application

  • VARYCONTROL VAV terminal units of Type TVA for the extract air flow control in variable air volume systems
  • Closed-loop volume flow control using an external power supply
  • Integral attenuator for demanding acoustic requirements
  • Shut-off by means of switching (equipment supplied by others)

Special features

  • Integral attenuator with at least 26 dB insertion loss at 250 Hz
  • Hygiene tested and certified
  • Factory set-up or programming and aerodynamic function testing
  • Volume flow rate can later be measured and adjusted on site; additional adjustment device may be necessary

Nominal sizes

  • 125, 160, 200, 250, 315, 400

Variants

  • TVA: Extract air unit
  • TVA-D: Extract air unit with acoustic cladding
  • Units with acoustic cladding and/or secondary silencer Type TS for very demanding acoustic requirements
  • Acoustic cladding cannot be retrofitted

Parts and characteristics

  • Ready-to-commission unit which consists of mechanical parts and control components.
  • Averaging differential pressure sensor for volume flow rate measurement
  • Damper blade
  • Integral attenuator
  • Factory-assembled control components complete with wiring and tubing
  • Aerodynamic function testing on a special test rig prior to shipping of each unit
  • Set-up data is given on a label or volume flow rate scale affixed to the unit
  • High control accuracy even in case of unfavourable upstream conditions

Attachments

  • Easy controller: Compact unit consisting of controller with potentiometers, differential pressure transducer and actuator
  • Compact controller: Compact unit consisting of controller, differential pressure transducer and actuator
  • Universal controller: Controller, differential pressure transducer and actuators for special applications
  • LABCONTROL: Control components for air management systems

Accessories

  • Lip seal (factory fitted)

Useful additions

  • Secondary silencer Type TS

Construction features

  • Rectangular casing
  • Spigot on the fan end suitable for circular ducts to EN 1506 or EN 13180
  • Spigot with groove for lip seal
  • Connection on the room end suitable for air duct profiles
  • Baffle plate is fitted after the damper blade for optimum aerodynamic performance
  • Position of the damper blade indicated externally at shaft extension
  • Thermal and acoustic insulation (lining)

Materials and surfaces

  • Casing and damper blade made of galvanised sheet steel
  • Damper blade seal made of TPE plastic
  • Lining is mineral wool
  • Differential pressure sensor made of aluminium
  • Plastic bearings


Variant with acoustic cladding (-D)

  • Acoustic cladding made of galvanised sheet steel
  • Lining is mineral wool
  • Rubber elements for the insulation of structure-borne noise


Mineral wool

  • To EN 13501, fire rating class A1, non-combustible
  • RAL quality mark RAL-GZ 388
  • Biosoluble and hence hygienically safe according to the German TRGS 905 (Technical Rules for Hazardous Substances) and EU directive 97/69/EG
  • Faced with glass fibre fabric as protection against erosion through airflow velocities of up to 20 m/s
  • Inert to fungal and bacterial growth

Standards and guidelines

  • Hygiene conforms to VDI 6022
  • VDI 2083, air cleanliness class 3, and US standard 209E, class 100
  • Closed blade air leakage to EN 1751, class 4 (nominal sizes 125 and 160, class 3).
  • Nominal sizes 125 and 160 meet the general requirements, nominal sizes 200 – 400 meet the increased requirements of DIN 1946, part 4, with regard to the acceptable closed blade air leakage
  • Casing air leakage to EN 1751, class A

Maintenance

  • Maintenance-free as construction and materials are not subject to wear

Technical information

Function, Technical data, Quick sizing, Specification text, Order code, Related Products

  • Function
  • Technical data
  • Quick sizing
  • Specification text
  • Order code
  • RELATED PRODUCTS
Schematic illustration of the TVA 00181201_0
① Integral attenuator
② Lip seal
③ Damper blade
④ Differential pressure sensor
⑤ Control components, e.g. an Easy controller


Functional description

The VAV terminal unit is fitted with a differential pressure sensor for measuring the volume flow rate.

The control components (attachments) include a differential pressure transducer that transforms the differential pressure (effective pressure) into an electric signal, a controller, and an actuator; the control functions can be achieved with an Easy controller, with a Compact controller, or with individual components (Universal or LABCONTROL).

For most applications, the setpoint value comes from a room temperature controller.

The controller compares the actual value with the setpoint value and alters the control signal of the actuator if there is a difference between the two values.

An integral attenuator reduces the noise that is created by the restriction of the airflow.

The airflow velocity at the room end is, due to the larger rectangular cross section, about half the velocity in the circular duct.

Volume flow rate ranges

The minimum differential pressure of VAV terminal units is an important factor in designing the ductwork and in rating the fan including speed control.

Sufficient duct pressure must be ensured for all operating conditions and for all control units. The measurement points for fan speed control must be selected accordingly.

The volume flow rates given for VAV terminal units depend on the nominal size and on the control component (attachment) that is installed. The table gives the minimum and maximum values for a VAV terminal unit. Some control components may only have a limited volume flow rate range. This applies in particular to control components with a static differential pressure transducer. For volume flow rate ranges for all control components refer to our Easy Product Finder design programme.

Nominal size
V
l/s
V
m³/h

∆pst min
Pa

∆pst min
Pa
∆V
± %
125 15 54 5 5 19
125 60 216 25 35 8
125 105 378 75 95 7
125 150 540 150 190 5
160 25 90 5 5 19
160 100 360 25 30 8
160 175 630 75 85 7
160 250 900 150 170 5
200 40 144 5 5 19
200 160 576 30 35 8
200 280 1008 95 105 7
200 405 1458 190 210 5
250 60 216 5 5 19
250 250 900 25 30 8
250 430 1548 75 85 7
250 615 2214 150 170 5
315 100 360 5 5 19
315 410 1476 30 35 8
315 720 2592 90 110 7
315 1030 3708 180 220 5
400 170 612 5 5 19
400 670 2412 25 35 8
400 1175 4230 75 95 7
400 1680 6048 150 190 5


Nominal sizes

125 – 400 mm

Volume flow rate range

15 – 1680 l/s or 54 – 6048 m³/h

Volume flow rate control range (unit with dynamic differential pressure measurement)

Approx. 10 to 100% of the nominal volume flow rate

Minimum differential pressure

5 – 190 Pa

Maximum differential pressure

1000 Pa

Operating temperature

10 – 50 °C




Quick sizing tables provide a good overview of the room sound pressure levels that can be expected. Approximate intermediate values can be interpolated. Precise intermediate values and spectral data can be calculated with our Easy Product Finder design programme.

The first selection criteria for the nominal size are the actual volume flow rates Vmin and Vmax. The quick sizing tables are based on generally accepted attenuation levels. If the sound pressure level exceeds the required level, a larger air terminal unit and/or a silencer is required.

TVA, Sound pressure level at differential pressure 150 Pa

Nominal size V Air-regenerated noise Case-radiated noise
Nominal size V
Nominal size V LPA LPA1 LPA2 LPA3
Nominal size l/s m³/h dB(A)

125

15

54

18

16

15

<15

125

60

216

24

21

26

21

125

105

378

26

23

30

25

125

150

540

25

25

33

27

160

25

90

16

15

15

<15

160

100

360

28

23

24

20

160

175

630

28

23

29

24

160

250

900

23

22

32

27

200

40

144

15

<15

16

<15

200

160

576

20

17

24

20

200

280

1008

23

18

30

25

200

405

1458

26

25

32

27

250

60

216

16

<15

15

<15

250

250

900

19

16

25

20

250

430

1548

20

18

29

24

250

615

2214

27

27

33

28

315

105

378

17

15

15

<15

315

410

1476

26

21

28

23

315

720

2592

25

22

34

29

315

1030

3708

27

27

37

32

400

170

612

16

<15

17

<15

400

670

2412

18

<15

32

26

400

1175

4230

23

19

37

32

400

1680

6048

32

29

42

38

① TVA

② TVA with secondary silencer TS

③ TVA-D


Rectangular VAV terminal units for variable and constant air volume systems, suitable for extract air, available in 6 nominal sizes.

High volume flow rate control accuracy.

Ready-to-commission unit which consists of the mechanical parts and the electronic control components. Each unit contains an averaging differential pressure sensor for volume flow rate measurement, a damper blade, and an integral attenuator. Factory-assembled control components complete with wiring and tubing.

Differential pressure sensor with 3 mm measuring holes (resistant to dust and pollution)

On the fan end, spigot with groove for lip seal, suitable for connecting ducts to EN 1506 or EN 13180.

Room end suitable for the connection of air duct profiles.

Baffle plate is fitted after the damper blade for optimum acoustic and aerodynamic performance.

Casing with acoustic and thermal insulation.

Position of the damper blade indicated externally at shaft extension.

Closed blade air leakage to EN 1751, class 4 (nominal sizes 125 and 160, class 3).

Casing air leakage to EN 1751, class B.

Complies with VDI 2083, clean room class 3, and US standard 209E, class 100. Hygiene complies with VDI 6022, DIN 1946, part 4, as well as EN 13779 and VDI 3803.

Special features

  • Integral attenuator with at least 26 dB insertion loss at 250 Hz
  • Hygiene tested and certified
  • Factory set-up or programming and aerodynamic function testing
  • Volume flow rate can later be measured and adjusted on site; additional adjustment device may be necessary

Materials and surfaces

  • Casing and damper blade made of galvanised sheet steel
  • Damper blade seal made of TPE plastic
  • Lining is mineral wool
  • Differential pressure sensor made of aluminium
  • Plastic bearings


Variant with acoustic cladding (-D)

  • Acoustic cladding made of galvanised sheet steel
  • Lining is mineral wool
  • Rubber elements for the insulation of structure-borne noise


Mineral wool

  • To EN 13501, fire rating class A1, non-combustible
  • RAL quality mark RAL-GZ 388
  • Biosoluble and hence hygienically safe according to the German TRGS 905 (Technical Rules for Hazardous Substances) and EU directive 97/69/EG
  • Faced with glass fibre fabric as protection against erosion through airflow velocities of up to 20 m/s
  • Inert to fungal and bacterial growth

Technical data

  • Nominal sizes: 125 to 400 mm
  • Volume flow rate range: 15 to 1680 l/s or 54 to 6048 m³/h
  • Volume flow rate control range (unit with dynamic differential pressure measurement): approx. 10 to 100 % of the nominal volume flow rate
  • Minimum differential pressure: 5 – 190 Pa
  • Maximum differential pressure: 1000 Pa

Attachments

Variable volume flow control with electronic Easy controller to connect an external control signal; actual value signal can be integrated into the central BMS.

  • Supply voltage 24 V AC/DC
  • Signal voltages 0 – 10 V DC
  • Possible override controls with external switches using volt-free contacts: CLOSED, OPEN, Vmin and Vmax
  • Potentiometers with percentage scales to set the volume flow rates Vmin and Vmax
  • The actual value signal relates to the nominal volume flow rate such that commissioning and subsequent adjustment are simplified
  • Volume flow rate control range: approx. 10 – 100 % of the nominal volume flow rate
  • Clearly visible external indicator light for signalling the functions: Set, not set, and power failure

Electrical connections with screw terminals. Double terminals for looping the supply voltage, i.e. for the simple connection of voltage transmission to the next controller.

Sizing data

  • V _______________________ [m³/h]
  • Δpst _______________________ [Pa]

Air-regenerated noise

  • LPA _______________________ [dB(A)]

Case-radiated noise

  • LPA _______________________ [dB(A)]

This specification text describes the general properties of the product. Texts for variants can be generated with our Easy Product Finder design programme.

Order example: TVA-D/160/D1/BC0/E0/200–800 m³/h

Acoustic cladding

With

Nominal size

160 mm

Accessories

Lip seal

Attachment

Compact controller

Operating mode

Single

Signal voltage range

0 – 10 V DC

Volume flow rate

200 – 800 m³/h


Order example: TVA/200/ELAB/RE/TZ/CLR

Acoustic cladding

Without

Nominal size

200 mm

Attachment

EASYLAB controller TCU3 with fast-running actuator

Equipment function

Extract air control (Room Exhaust)

Expansion modules

EM-TRF for 230 V AC, EM-AUTOZERO Solenoid valve for automatic zero point correction

Additional function

Supply air led system (clean rooms), room management function is active


 

Variants, Attachments, Dimensions and weight, Product details

  • Variants
  • ATTACHMENTS
  • Dimensions and weight
  • Product details

TVA

  • VAV terminal unit for the control of variable extract air volume flows

TVA-D

  • VAV terminal unit with acoustic cladding for the control of variable extract air volume flows
  • For rooms where the case-radiated noise of the unit is not sufficiently reduced by a false ceiling
  • The circular ducts for the room under consideration must have adequate acoustic insulation (provided by others) on the fan end
  • Acoustic cladding cannot be retrofitted

TVA, VARYCONTROL control components

Order code detail Controlled variable Controller Differential pressure transducer Actuator

Easy controller





Easy

Volume flow rate

Easy controller TROX

Dynamic, integral

Integral

Compact controller, dynamic





BC0

Volume flow rate

Compact controller with MP bus interface TROX/Belimo

Dynamic, integral

Integral

BL0

Volume flow rate

Compact controller with LonWorks interface TROX/Belimo

Dynamic, integral

Integral

BM0

Volume flow rate

Compact controller with Modbus RTU interface (with connecting cable) TROX/Belimo

Dynamic, integral

Integral

BM0-J6

Volume flow rate

Compact controller with Modbus RTU interface (with socket) TROX/Belimo

Dynamic, integral

Integral

XB0

Volume flow rate

Compact controller TROX/Gruner

Dynamic, integral

Integral

LN0

Volume flow rate

Compact controller Siemens

Dynamic, integral

Integral

LK0

Volume flow rate

Compact controller with KNX interface Siemens

Dynamic, integral

Integral

Compact controller, static





SA0

Volume flow rate

Compact controller with SLC interface Sauter

Static, integral

Integral

SC0

Volume flow rate

Compact controller with SLC interface Sauter

Static, integral

Fast-running actuator, integral

Universal controller, dynamic





B13

Volume flow rate

Universal controller TROX/Belimo

Dynamic, integral

Actuator

B1B

Volume flow rate

Universal controller TROX/Belimo

Dynamic, integral

Spring return actuator

XC3

Volume flow rate

Universal controller TROX/Gruner

Dynamic, integral

Spring return actuator

Universal controller, static





BP3

Volume flow rate

Universal controller with MP bus interface TROX/Belimo

Static

Actuator

BPB

Volume flow rate

Universal controller with MP bus interface TROX/Belimo

Static

Spring return actuator

BPG

Volume flow rate

Universal controller with MP bus interface TROX/Belimo

Static

Fast-running actuator

BB3

Volume flow rate

Universal controller TROX/Belimo

Static

Actuator

BBB

Volume flow rate

Universal controller TROX/Belimo

Static

Spring return actuator

XD1

Volume flow rate

Universal controller TROX/Gruner

Static, integral

Actuator

XD3

Volume flow rate

Universal controller TROX/Gruner

Static, integral

Spring return actuator

BR3

Differential pressure

Universal controller with MP bus interface TROX/Belimo

Static, integral 100 Pa

Actuator

BRB

Differential pressure

Universal controller with MP bus interface TROX/Belimo

Static, integral 100 Pa

Spring return actuator

BRG

Differential pressure

Universal controller with MP bus interface TROX/Belimo

Static, integral 100 Pa

Fast-running actuator

BG3

Differential pressure

Differential pressure controller TROX/Belimo

Static, integral 100 Pa

Actuator

BGB

Differential pressure

Differential pressure controller TROX/Belimo

Static, integral 100 Pa

Spring return actuator

XE1

Differential pressure

Differential pressure controller TROX/Gruner

Static, integral 100 Pa

Actuator

XE3

Differential pressure

Differential pressure controller TROX/Gruner

Static, integral 100 Pa

Spring return actuator


TVA, LABCONTROL control components

Order code detail Controlled variable Controller Differential pressure transducer Actuator

EASYLAB





ELAB

Room extract air Room pressure Single controller

EASYLAB controller TCU3

Static, integral

Fast-running actuator

Nominal size
ØD
mm
L
mm
B3
mm
H3
mm
B
mm
B1
mm
H
mm
H1
mm
A
mm
m
kg
125 124 1220 300 236 198 232 152 186 185 21
160 159 1205 410 236 308 342 152 186 170 25
200 199 1460 560 281 458 492 210 244 138 33
250 249 1540 700 311 598 632 201 235 97 55
315 314 1685 900 361 798 832 252 286 245 73
400 399 1995 1000 446 898 932 354 388 176 118


Nominal size
ØD
mm
L
mm
B3
mm
H3
mm
B
mm
B1
mm
H
mm
H1
mm
A
mm
m
kg
125 124 1220 380 316 198 232 152 186 145 41
160 159 1205 490 316 308 342 152 186 130 50
200 199 1460 640 361 458 492 210 244 98 63
250 249 1540 780 391 598 632 201 235 57 95
315 314 1685 980 441 798 832 252 286 205 133
400 399 1995 1080 526 898 932 354 388 136 193




Detail of flange 00137158_0
① Compressible seal, to be provided by others
② Flange


Installation details, Basic information and nomenclature

  • Installation details
  • Basic information and nomenclature

Installation and commissioning

  • Any installation orientation (except units with static differential pressure transducer)
  • Return edges of the casing with drilled holes suitable for M10 threaded rods
  • TVA-D: For constructions with acoustic cladding, ducts on the room side should have cladding up to the acoustic cladding of the controller

Upstream conditions

The volume flow rate accuracy ΔV applies to a straight upstream section of the duct. Bends, junctions or a narrowing or widening of the duct cause turbulence that may affect measurement. Duct connections, e.g. branches off the main duct, must comply with EN 1505. Some installation situations require straight duct sections upstream.

Space required for commissioning and maintenance

Sufficient space must be kept clear near any attachments to allow for commissioning and maintenance. It may be necessary to provide sufficiently sized inspection access openings.

Space required

Attachments
Attachments mm

VARYCONTROL




Easy controller

400

300

300

Compact controller

400

300

300

Universal controller

700

300

300

LABCONTROL




EASYLAB

900

350

400


Principal dimensions

ØD [mm]

VAV terminal units made of stainless steel: Outside diameter of the spigot

VAV terminal units made of plastic: Inside diameter of the connecting spigot

ØD₁ [mm]

Pitch circle diameter of flanges

ØD₂ [mm]

Outside diameter of flanges

ØD₄ [mm]

Inside diameter of the screw holes of flanges

L [mm]

Length of unit including connecting spigot

L₁ [mm]

Length of casing or acoustic cladding

B [mm]

Duct width

B₁ [mm]

Screw hole pitch of flange (horizontal)

B₂ [mm]

Outside dimension of flange (width)

B₃ [mm]

Width of device

H [mm]

Duct height

H₁ [mm]

Screw hole pitch of flange (vertical)

H₂ [mm]

Outside dimension of flange (height)

H₃ [mm]

Unit height

n [ ]

Number of flange screw holes

T [mm]

Flange thickness

m [kg]

Unit weight including the minimum required attachments (e.g. Compact controller)

Acoustic data

fm [Hz]

Octave band centre frequency

LPA [dB(A)]

A-weighted sound pressure level of air-regenerated noise of the VAV terminal unit, system attenuation taken into account

LPA1 [dB(A)]

A-weighted sound pressure level of air-regenerated noise of the VAV terminal unit with secondary silencer, system attenuation taken into account

LPA2 [dB(A)]

A-weighted sound pressure level of case-regenerated noise of the VAV terminal unit, system attenuation taken into account

LPA3 [dB(A)]

A-weighted sound pressure level of case-regenerated noise of the VAV terminal unit with acoustic cladding, system attenuation taken into account


All sound pressure levels are based on 20 μPa.

Volume flow rates

Vnom [m³/h] and [l/s]

Nominal volume flow rate (100 %)

  • The value depends on product type and nominal size
  • Values are published on the internet and in technical leaflets, and stored in the Easy Product Finder design software.
  • Reference value for calculating percentages (e.g. Vmax)
  • Upper limit of the setting range and maximum volume flow rate setpoint value for the VAV terminal unit

Vmin unit [m³/h] and [l/s]

Technically possible minimum volume flow rate

  • The value depends on product type, nominal size and control component (attachment)
  • Values are stored in the Easy Product Finder design software
  • Lower limit of the setting range and minimum volume flow rate setpoint value for the VAV terminal unit
  • Depending on the controller, setpoint values below Vmin unit (if Vmin equals zero) may result in unstable control or shut-off

Vmax [m³/h] and [l/s]

Upper limit of the operating range for the VAV terminal unit that can be set by customers

  • Vmax can only be smaller than or equal to Vnom
  • In case of analogue signalling to volume flow controllers (which are typically used), the set maximum value (Vmax) is allocated to the setpoint signal maximum (10 V) (see characteristic)

Vmin [m³/h] and [l/s]

Lower limit of the operating range for the VAV terminal unit that can be set by customers

  • Vmin should be smaller than or equal to Vmax
  • Do not set Vmin smaller than Vmin unit, otherwise the control may become unstable or the damper blade may close
  • Vmin may equal zero
  • In case of analogue signalling to volume flow controllers (which are typically used), the set minimum value (Vmin) is allocated to the setpoint signal minimum (0 or 2 V) (see characteristic)

V [m³/h] and [l/s]

Volume flow rate

ΔV [± %]

Volume flow rate tolerance from setpoint value

ΔVwarm [± %]

Volume flow rate tolerance for the warm air flow of dual duct terminal units

Differential pressure

Δpst [Pa]

Static differential pressure

Δpst min [Pa]

Static differential pressure, minimum

  • The static minimum differential pressure is equal to the pressure loss of the VAV terminal unit when the damper blade is open, caused by flow resistance (sensor tubes, damper mechanism)
  • If the pressure on the VAV terminal unit is too low, the setpoint volume flow rate may not be achieved, not even when the damper blade is open
  • Important factor in designing the ductwork and in rating the fan including speed control
  • Sufficient duct pressure must be ensured for all operating conditions and for all terminal units, and the measurement point or points for speed control must have been selected accordingly to achieve this

Construction

Galvanised sheet steel

  • Casing made of galvanised sheet steel
  • Parts in contact with the airflow as described for the product type
  • External parts, e.g. mounting brackets or covers, are usually made of galvanised sheet steel

Powder-coated surface (P1)

  • Casing made of galvanised sheet steel, powder-coated RAL 7001, silver grey
  • Parts in contact with the airflow are powder-coated or made of plastic
  • Due to production, some parts that come into contact with the airflow may be stainless steel or aluminium, powder-coated
  • External parts, e.g. mounting brackets or covers, are usually made of galvanised sheet steel

Stainless steel (A2)

  • Casing made of stainless steel 1.4201
  • Parts in contact with the airflow are powder-coated or made of stainless steel
  • External parts, e.g. mounting brackets or covers, are usually made of galvanised sheet steel

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