Type TVLK

Optimised for use in laboratories and on fume cupboards

Plastic circular VAV terminal units for aggressive extract air in laboratories and production facilities

  • Casing and damper blade made of flame-resistant polypropylene
  • Compact construction, only 400 mm long
  • High control accuracy even in case of unfavourable upstream conditions
  • Combination with fast-running actuators (air management systems)
  • Volume flow rate measurement with bluff body or nozzle
  • Slide-out sensor tubes allow for easy cleaning
  • Closed blade air leakage to EN 1751, class 4
  • Casing air leakage to EN 1751, class C


Optional equipment and accessories

  • With flanges on both ends
  • Plastic secondary silencer Type CAK for the reduction of air-regenerated noise

VAV terminal unit, variant TVLK, with nozzle and flange 00131763_0
  • Application
  • Description

Application

  • Circular LABCONTROL VAV terminal units of Type TVLK, made of plastic, to control the volume flow rate of fume cupboards and fume hoods
  • Suitable for contaminated air
  • Closed-loop volume flow control using an external power supply
  • Shut-off by means of switching (equipment supplied by others)

Special characteristics

  • High control accuracy even in case of unfavourable upstream conditions
  • Integral slide-out differential pressure sensor with 3 mm measuring holes (resistant to dust and pollution)
  • No metal parts come into contact with the airflow
  • Factory set-up or programming and aerodynamic function testing
  • Volume flow rate can be measured and subsequently adjusted on site; additional adjustment tool or configuration software may be necessary

Nominal sizes

  • Bluff body: 250 – 100, 250 – 160
  • Nozzle: 250 – D08, 250 – D10, 250 – D16
  • Bluff body available in two sizes and nozzle available in three sizes for different volume flow rate ranges

Variants

  • TVLK: VAV terminal unit
  • TVLK-FL: VAV terminal unit with flanges on both ends

Parts and characteristics

  • Ready-to-commission unit which consists of mechanical parts and control components (attachments)
  • Averaging differential pressure sensor for volume flow rate measurement; can be removed for cleaning
  • Damper blade
  • Factory assembled control components (attachments) complete with wiring and tubing
  • Aerodynamic functional testing on a special test rig prior to shipping of each unit
  • Unit carries test label with relevant data

Attachments

  • LABCONTROL: Control components (attachments) for air management systems
  • Universal controller: Controller, differential pressure transducer and actuators for special applications

Zubehör

  • Beidseitig mit Gegenflansch und Dichtung

Useful additions

  • Plastic secondary silencer Type CAK for demanding acoustic requirements

Construction features

  • Circular casing
  • Short casing: 392 mm without flange, 400 mm with flange
  • Spigot suitable for ducts according to DIN 8077
  • Both spigots with same diameter (250 mm)
  • Position of the damper blade indicated externally at shaft extension

Materials and surfaces

  • Casing and damper blade made of flame-resistant polypropylene (PP), flammability to UL 94, V-0
  • Differential pressure sensor (with bluff body, or nozzle) and plain bearing made of polypropylene (PP)
  • Damper blade seal made of thermoplastic elastomers (TPE)

Standards and guidelines

  • Hygiene conforms to VDI 6022
  • Closed blade air leakage to EN 1751, class 4
  • Meets the increased requirements of DIN 1946, part 4, with regard to the acceptable closed blade air leakage
  • Casing air leakage to EN 1751, class C

Maintenance

  • Maintenance-free as construction and materials are not subject to wear
  • Zero point correction of the static differential pressure transducer should be carried out once per year (recommendation)

Technische Information

Function, Technical data, Quick sizing, Specification text, Order code, Produktbeziehungen

  • Function
  • Technical data
  • Quick sizing
  • Specification text
  • Order code
Skjematisk framstilling av TVLK 00137305_0

① Nozzle (optional)

② EASYLAB control component

③ Casing

④ Actuator

⑤ Bluff body and sensor tubes

Functional description

For measuring the volume flow rate the VAV terminal unit is fitted either with a bluff body and a differential pressure sensor or with a nozzle.

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.

  • Fume cupboard control: The volume flow rate setpoint depends on the control strategy for the fume cupboard and is based on the face velocity, the sash position, or a constant value.
  • Volume flow control: The volume flow rate setpoint comes from an external unit.

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.

Volumenstrombereiche

Die Mindestdruckdifferenz der VVS-Regelgeräte ist eine wichtige Größe zur Planung des Kanalnetzes und zur Dimensionierung des Ventilators einschließlich der Drehzahlsteuerung.

Es muss sichergestellt sein, dass unter allen Betriebsbedingungen an allen Regelgeräten ein ausreichender Kanaldruck ansteht. Der Messpunkt oder die Messpunkte für die Drehzahlsteuerung des Ventilators sind dementsprechend auszuwählen.

Die Volumenstrombereiche von VVS-Regelgeräten sind von der Nenngröße und von der verwendeten Regelkomponente (Anbauteil) abhängig. Die dargestellten Tabellenwerte sind die Minimal- und Maximalwerte des VVS-Regelgerätes. Für bestimmte Regelkomponenten gelten eingeschränkte Bereiche. Dies gilt insbesondere für Regelkomponenten mit statischem Differenzdrucktransmitter. Volumenstrombereiche für alle Regelkomponenten enthält das Auslegungsprogramm Easy Procuct Finder.

Nominal sizes

250 mm

Volume flow rate range

30 – 515 l/s or 108 – 1854 m³/h

Volume flow rate control range

Approx. 15 to 100 % of the nominal volume flow rate

Minimum differential pressure

5 – 130 Pa

Maximum differential pressure

1000 Pa

Operating temperature

10 – 50 °C






Die Schnellauslegung gibt einen guten Überblick über die zu erwartenden Schalldruckpegel im Raum. Ungefähre Zwischenwerte können interpoliert werden. Zu exakten Zwischenwerten und Spektraldaten führt die Auslegung mit unserem Auslegungsprogramm Easy Product Finder.

Die Auswahl der Nenngröße erfolgt zunächst nach den gegebenen Volumenströmen Vmin und Vmax. In der Schnellauslegung sind praxisgerechte Dämpfungswerte berücksichtigt. Liegt der Schalldruckpegel über dem zulässigen Wert, sind ein größeres Volumenstrom-Regelgerät und/oder ein Schalldämpfer erforderlich.

TVLK with EASYLAB, 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
Nominal size l/s m³/h dB(A)

250-100

55

198

40

33

29

26

26

250-100

140

504

46

38

34

31

33

250-100

220

792

47

39

35

31

37

250-100

360

1296

48

39

35

32

42

250-160

30

108

37

32

28

25

22

250-160

80

288

41

35

31

28

29

250-160

120

432

43

37

33

30

32

250-160

195

702

49

42

38

35

40

250-D08

95

342

36

26

23

20

23

250-D08

210

756

40

31

27

24

29

250-D08

315

1134

41

32

29

26

33

250-D08

515

1854

44

34

31

28

38

250-D10

55

198

36

28

24

21

24

250-D10

140

504

42

34

30

27

31

250-D10

220

792

43

35

31

28

35

250-D10

360

1296

45

37

33

29

38

250-D16

30

108

33

28

24

22

21

250-D16

80

288

39

33

30

28

28

250-D16

120

432

42

36

33

30

31

250-D16

195

702

47

42

38

36

38

① TVLK

② TVLK with circular silencer CAK, insulation thickness 50 mm, length 500 mm

③ TVLK with circular silencer CAK, insulation thickness 50 mm, length 1000 mm

④ TVLK with circular silencer CAK, insulation thickness 50 mm, length 1500 mm


TVLK with VARYCONTROL Universal controller, 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
Nominal size l/s m³/h dB(A)

250-100

65

234

41

34

30

27

27

250-100

180

648

46

38

34

31

35

250-100

290

1044

47

39

35

31

40

250-100

360

1296

48

39

35

32

42

250-160

35

126

38

33

29

26

23

250-160

100

360

42

36

32

29

30

250-160

160

576

45

37

34

31

34

250-160

195

702

49

42

38

35

40

250-D08

95

342

36

26

23

20

23

250-D08

210

756

40

31

27

24

29

250-D08

315

1134

41

32

29

26

33

250-D08

515

1854

44

34

31

28

38

250-D10

65

234

37

30

26

22

25

250-D10

180

648

43

35

31

28

33

250-D10

290

1044

44

36

32

29

36

250-D10

360

1296

45

37

33

29

38

250-D16

35

126

34

29

25

23

22

250-D16

100

360

41

35

32

29

30

250-D16

160

576

43

37

34

32

32

250-D16

195

702

47

42

38

36

38

① TVLK

② TVLK with circular silencer CAK, insulation thickness 50 mm, length 500 mm

③ TVLK with circular silencer CAK, insulation thickness 50 mm, length 1000 mm

④ TVLK with circular silencer CAK, insulation thickness 50 mm, length 1500 mm


Circular VAV terminal units made of flame-resistant plastic, for variable air volume systems and fume cupboards. Suitable for the control of extract air containing aggressive media since all components coming into contact with the airflow are made of plastic (no interior metal parts).

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

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

Spigot, suitable for ducts according to DIN 8077.

Position of the damper blade indicated externally at shaft extension.

Closed blade air leakage to EN 1751, class 4.

Casing air leakage to EN 1751, class C.

Special characteristics

  • High control accuracy even in case of unfavourable upstream conditions
  • Integral slide-out differential pressure sensor with 3 mm measuring holes (resistant to dust and pollution)
  • No metal parts come into contact with the airflow
  • Factory set-up or programming and aerodynamic function testing
  • Volume flow rate can be measured and subsequently adjusted on site; additional adjustment tool or configuration software may be necessary

Materials and surfaces

  • Casing and damper blade made of flame-resistant polypropylene (PP), flammability to UL 94, V-0
  • Differential pressure sensor (with bluff body, or nozzle) and plain bearing made of polypropylene (PP)
  • Damper blade seal made of thermoplastic elastomers (TPE)

Technische Daten

  • Nenngrößen: 250 mm
  • Volumenstrombereich: 30 – 515 l/s oder 108 – 1854 m³/h
  • Volumenstromregelbereich: Ca. 15 – 100 % vom Nennvolumenstrom
  • Mindestdruckdifferenz: 5 – 130 Pa
  • Maximal zulässige Druckdifferenz: 1000 Pa

Attachments

Variable volume flow control with electronic EASYLAB controller for fume cupboards.

  • Supply voltage 24 V AC
  • Fast and stable control
  • Static differential pressure measurement
  • Fast-running actuator
  • Easy commissioning due to plug and play communication system
  • Controller is a modular system and can be expanded
  • Volume flow rate monitoring

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.

00132123_0

 Type
TVLK       VAV terminal unit, plastic

 Flange
          No entry: none
FL      Flanges on both ends

 Nominal size
250 – 100 Bluff body 100
250 – 160 Bluff body 160
250 – D08 Nozzle D08
250 – D10 Nozzle D10
250 – D16 Nozzle D16

 Accessories
          No entry: none
GK     Matching flanges for both ends

 Attachments (control component)
ELAB       EASYLAB controller TCU3 with fast-running actuator

 Equipment function
          With face velocity transducer
FH-VS       Face velocity control
          With sash distance sensor
FH-DS        Linear control strategy
FH-DV       Safety-optimised control strategy
          With switching steps for on-site switch con tacts
FH-2P       2 switching steps
FH-3P       3 switching steps
          Without signalling
FH-F       Volume flow rate constant value

 Expansion modules
          Option 1: Supply voltage
          No entry: 24 V AC
T       EM-TRF for 230 V AC
U       EM-TRF-USV for 230 V AC, provides unin terruptible power supply (UPS)
          Option 2: Communication interface
          No entry: none
L      EM-LON for LonWorks FTT-10A
B      EM-BAC-MOD-01 for BACnet MS/TP
M     EM-BAC-MOD-01 for Modbus RTU
I       EM-IP for BACnet/IP, Modbus/IP and webserver
R      EM-IP with real time clock
          Option 3: Automatic zero point correction
          No entry: none
Z       EM-AUTOZERO Solenoid valve for auto matic zero point correction
         Option 4: Lighting
         No entry: none
S       EM-LIGHT Wired socket for the connection 
of lighting and for switching the lighting on/off using the control panel (only with EM-TRF or EM-TRF-USV)

 Operating values [m³/h or l/s]
       Depending on the equipment function
       VS: Vmin – Vmax
       DS: Vmin – Vmax
       DV: Vmin – Vmax
       2P: V1 / V2
       3P: V1 / V2 / V3
       F: V1

Useful additions
          Control panel for fume cupboard controller, for displaying the functions of the control system according to EN 14175
BE-SEG-** OLED display
BE-LCD-01 40-character display

 

Variants, Attachments, Dimensions and weight

  • Variants
  • Attachments
  • Dimensions and weight

TVLK

  • VAV terminal unit for the control of variable air volume flow rates
  • Spigot to make connections to the ducting

TVLK-FL

  • VAV terminal unit for the control of variable air volume flow rates
  • With flanges to make detachable connections to the ductwork

TVLK, Regelkomponenten VARYCONTROL

Bestellschlüsseldetail Regelgröße Regler Differenzdrucktransmitter Stellantrieb

Universalregler, statisch





BP3

Volumenstrom

Universalregler mit MP-Bus-Schnittstelle Fabrikat TROX/Belimo

Statisch, integriert

Stellantrieb

BPG

Volumenstrom

Universalregler mit MP-Bus-Schnittstelle Fabrikat TROX/Belimo

Statisch, integriert

Schnelllaufender Stellantrieb

BB3

Volumenstrom

Universalregler Fabrikat TROX/Belimo

Statisch, integriert

Stellantrieb


TVLK, Regelkomponenten LABCONTROL

Bestellschlüsseldetail Regelgröße Regler Differenzdrucktransmitter Stellantrieb

EASYLAB





ELAB

Laborabzug Raumzuluft Raumabluft Raumdruck Einzelregler

EASYLAB Regler TCU3

Statisch, integriert

Schnelllaufender Stellantrieb


Anbauteile: VARYCONTROL Regelkomponenten

Regel- größe Schnittstelle Vmin -/ Vmax - Verstellung Differenzdruck- transmitter Stellantrieb Fabrikat LVC TVR TVJ TVT TZ-S TA-S TVZ TVA TVM TVRK TVLK





















Easyregler


Dynamisch















Easy

V



Integriert

Integriert







Compactregler


Dynamisch















BC0

V

MP-Bus


Integriert

Integriert





BF0

V

MP-Bus


Integriert

Integriert












BL0

V

LonWorks


Integriert

Integriert






BM0

V

Modbus


Integriert

Integriert













BM0-J6

V

Modbus und steckerfertiger Anschlussleitung


Integriert

Integriert













XG0

V



Integriert

Integriert












XB0

V



Integriert

Integriert






LN0

V



Integriert

Integriert






LK0

V

KNX
















LY0

V



Integriert

Integriert














Compactregler


Statisch















SA0

V



Integriert

Integriert













SC0

Δp



Integriert

Schnelllaufender Stellantrieb integriert















Universalregler


Dynamisch















B11

V



Integriert

Stellantrieb, Drehmoment für TVT












B13

V



Integriert

Stellantrieb







B27

V



Integriert

Stellantrieb












B1B

V



Integriert

Federrücklaufantrieb






XC3

V



Integriert

Federrücklaufantrieb








Universalregler


Statisch















BP1

V

MP-Bus


Separates Bauteil

Stellantrieb, Drehmoment für TVT












BP3

V

MP-Bus


Separates Bauteil

Stellantrieb





BPB

V

MP-Bus


Separates Bauteil

Federrücklaufantrieb





BPG

V

MP-Bus


Separates Bauteil

Schnelllaufender Stellantrieb




BB1

V



Separates Bauteil

Stellantrieb, Drehmoment für TVT












BB3

V



Separates Bauteil

Stellantrieb





BBB

V



Separates Bauteil

Federrücklaufantrieb






XD1

V



Integriert

Stellantrieb





XD3

V



Integriert

Federrücklaufantrieb





BR1

Δp

MP-Bus


100 Pa

Stellantrieb, Drehmoment für TVT












BR3

Δp

MP-Bus


100 Pa

Stellantrieb






BRB

Δp

MP-Bus


100 Pa

Federrücklaufantrieb





BRG

Δp

MP-Bus


100 Pa

Schnelllaufender Stellantrieb







BS1

Δp

MP-Bus


600 Pa

Stellantrieb, Drehmoment für TVT












BS3

Δp

MP-Bus


600 Pa

Stellantrieb









BSB

Δp

MP-Bus


600 Pa

Federrücklaufantrieb









BSG

Δp

MP-Bus


600 Pa

Schnelllaufender Stellantrieb









BG1

Δp



100 Pa

Stellantrieb, Drehmoment für TVT












BG3

Δp



100 Pa

Stellantrieb






BGB

Δp



100 Pa

Federrücklaufantrieb





BH1

Δp



600 Pa

Stellantrieb, Drehmoment für TVT












BH3

Δp



600 Pa

Stellantrieb










BHB

Δp



600 Pa

Federrücklaufantrieb









XE1

Δp



Integriert, 100 Pa

Stellantrieb





XE3

Δp



Integriert, 100 Pa

Federrücklaufantrieb





XF1

Δp



Integriert, 600 Pa

Stellantrieb









XF3

Δp



Integriert, 600 Pa

Federrücklaufantrieb









① TROX, ② TROX/Belimo, ③ TROX/Gruner, ④ Sauter, ⑤ Siemens

☒ Bestellschlüsseldetail, V Volumenstrom, Δp Differenzdruck


Anbauteile: LABCONTROL Regelkomponenten

Regel- größe Schnittstelle Vmin -/ Vmax - Verstellung Differenzdruck- transmitter Stellantrieb TVR TVJ TVT TZ-S TA-S TVZ TVA TVRK TVLK


















Easylabregler


Statisch












Elab

Raumzuluft

Raumabluft

Raumdruck

Einzelregler

TCU3


Integriert

Schnelllaufender Stellantrieb








Elab

Raumzuluft

Raumdruck

Einzelregler

TCU3


Integriert

Schnelllaufender Stellantrieb









Elab

Raumabluft

Raumdruck

Einzelregler

TCU3


Integriert

Schnelllaufender Stellantrieb









Elab

Raumzuluft

Raumabluft

Raumdruck

Laborabzug

Einzelregler

TCU3


Integriert

Schnelllaufender Stellantrieb











Elektronischer Regler


Statisch












TMA

Raumzuluft

Raumabluft

Raumdruck


TCU-LON-II mit LonWorks-Schnittstelle

Integriert

Schnelllaufender Stellantrieb








TMB

Schnelllaufender Stellantrieb (bürstenloser Motor)








TMA

Raumzuluft

Raumdruck


TCU-LON-II mit LonWorks-Schnittstelle

Integriert

Schnelllaufender Stellantrieb









TMB

Schnelllaufender Stellantrieb (bürstenloser Motor)









TMA

Raumabluft

Raumdruck


TCU-LON-II mit LonWorks-Schnittstelle

Integriert

Schnelllaufender Stellantrieb









TMB

Schnelllaufender Stellantrieb (bürstenloser Motor)









TMA

Raumzuluft

Raumabluft

Raumdruck

Laborabzug


TCU-LON-II mit LonWorks-Schnittstelle

Integriert

Schnelllaufender Stellantrieb









TMB

Schnelllaufender Stellantrieb (bürstenloser Motor)












Installation details, Basic information and nomenclature

  • Installation details
  • Basic information and nomenclature

Installation and commissioning

  • Installation orientation must be as shown on the sticker

Anströmbedingungen

Die Volumenstromgenauigkeit ΔV gilt für gerade Anströmung. Formstücke wie Bögen, Abzweige oder Querschnittsveränderungen verursachen Turbulenzen, die die Messung beeinflussen können. Bei Ausführung von Luftleitungsanschlüssen, wie z. B. dem Abzweig von einer Hauptleitung, ist die EN 1505 zu beachten. Für manche Einbausituationen sind gerade Anströmlängen erforderlich.

Platzbedarf für Inbetriebnahme und Instandhaltung

Um die Arbeiten zur Inbetriebnahme und Instandhaltung zu ermöglichen, ausreichenden Bauraum im Bereich der Anbauteile freihalten. Gegebenenfalls sind Revisionsöffnungen in ausreichender Größe erforderlich, sodass die Anbauteile leicht zugänglich sind.

Platzbedarf bei einseitigem Anbau

Anbauteile
Anbauteile mm

VARYCONTROL




Universalregler

300

320

300


Platzbedarf bei zweiseitigem Anbau

Anbauteile
Anbauteile mm

LABCONTROL







EASYLAB

350

350

400

300

250

300


Platzbedarf zur Reinigung der Sensorrohre

Nenngröße
Nenngröße mm

250-1** Staukörper

100

160

D

250-D** Düse

100

160

100

D: Gehäusedurchmesser


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 analog 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 analog 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

Ausführungen

Verzinktes Stahlblech

  • Luftführendes Gehäuse aus verzinktem Stahlblech
  • Im Luftstrom befindliche Teile, wie bei der Serie beschrieben
  • Außenliegende Bauteile, beispielsweise Konsolen und Deckel, in der Regel aus verzinktem Stahlblech

Pulverbeschichtete Oberfläche (P1)

  • Luftführendes Gehäuse aus verzinktem Stahlblech, pulverbeschichtet RAL 7001, silbergrau
  • Im Luftstrom befindliche Teile pulverbeschichtet oder Kunststoff
  • Fertigungsbedingt eventuell einige im Luftstrom liegende Teile aus Edelstahl oder Aluminium pulverbeschichtet
  • Außenliegende Bauteile, beispielsweise Konsolen und Deckel, in der Regel aus verzinktem Stahlblech

Edelstahl (A2)

  • Luftführendes Gehäuse aus Edelstahl Typ 1.4201
  • Im Luftstrom befindliche Teile pulverbeschichtet oder Edelstahl
  • Außenliegende Bauteile, beispielsweise Konsolen und Deckel, in der Regel aus verzinktem Stahlblech

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