Type LVC

For low airflow velocities and low duct pressures

Circular VAV terminal units for supply air and extract air systems with variable volume flows, low airflow velocities and low duct pressures

  • New measurement principle, optimised for airflow velocities from 0.6 to 6 m/s
  • High control accuracy even in case of unfavourable upstream conditions
  • Electronic control components for different applications (Easy, Compact)
  • Easy handling due to innovative controls
  • Casing length of only 310 mm for all nominal sizes
  • Any installation orientation
  • Closed blade air leakage to EN 1751, up to class 2
  • Casing air leakage to EN 1751, class C


Optional equipment and accessories

  • Secondary silencer Type CA, CS or CF for the reduction of air-regenerated noise
  • Hot water heat exchanger Type WL and electric air heater Type EL for reheating the airflow

VVS-Regelgerät Serie LVC 00131433_0
  • Application
  • Description

Application

  • Circular VAV terminal units of Type LVC for the precise supply air or extract air flow control in variable air volume systems with low airflow velocities.
  • Closed-loop volume flow control using an external power supply
  • For low airflow velocities and low duct pressures
  • Effective pressure (differential pressure) as the result of two measurements, one upstream and one downstream of the damper blade
  • The relation between damper blade position and differential pressure is stored as a characteristic relationship in the controller
  • Shut-off by means of switching (equipment supplied by others)

Special features

  • Optimised for low airflow velocities from 0.6 to 6 m/s
  • High control accuracy even in case of unfavourable upstream conditions
  • Any installation orientation
  • Volume flow rate control with Easy or Compact controller
  • Casing length of only 310 mm

Nominal sizes

  • 125, 160, 200, 250

Parts and characteristics

  • Ready-to-commission unit which consists of mechanical parts and control components.
  • Plastic nozzle with integral damper blade to measure the volume flow rate
  • Easy controller with potentiometers, indicator light, terminals, damper blade position indicator, and protective cover
  • Wire clamping bracket
  • Double lip seal
  • 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

Useful additions

  • Secondary silencer Type CA, CS or CF for demanding acoustic requirements

Construction features

  • Circular casing
  • Spigot with lip seal, for circular connecting ducts to EN 1506 or EN 13180
  • Position of the damper blade indicated externally at shaft extension


Easy controller

  • Screw terminals for the electrical connection
  • Double terminals for looping the supply voltage, i.e. for the simple connection of voltage transmission
  • Wire clamping bracket fixed to the casing


Compact controller

  • Cable for the electrical connection

Materials and surfaces

  • Casing made of galvanised sheet steel
  • Nozzle, damper blade, and plain bearings made of ABS plastic, UL 94, flame retardant (V-0)
  • Damper blade seal made of TPV (plastic)

Standards and guidelines

  • Hygiene conforms to VDI 6022
  • Closed blade air leakage to EN 1751, class 2 (nominal sizes 160 – 250, class 1)
  • Nominal size 125 meets the general 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

Technische Information

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

  • Function
  • Technical data
  • Quick sizing
  • Specification text
  • Order code
Schematic illustration of the LVC 00100229_0

① Plastic nozzle

② Damper blade

③ Lip seal

④ Easy controller

⑤ Volume flow rate scale

⑥ Wire clamping bracket

Functional description

A new measurement principle makes it possible to measure low volume flow rates. The pressure is measured by means of a nozzle with tappings before (upstream) and after (downstream) the damper blade. The Easy controller or the Compact controller of the LVC determines the resulting differential pressure (effective pressure) and compares it to the stored characteristic.

This measurement principle is characterised by small measuring tolerances, and the upstream conditions do not have to meet any special requirements.

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

∆pst min
Pa

∆pst min
Pa
∆V
± %
125 8 29 5 5 5 5 15
125 30 108 5 5 5 6 12
125 55 198 16 17 18 19 8
125 75 270 30 32 34 35 5
160 12 43 5 5 5 5 15
160 50 180 5 5 6 6 12
160 85 306 15 16 16 17 8
160 120 432 30 32 33 34 5
200 20 72 5 5 5 5 15
200 75 270 5 5 5 5 12
200 135 486 15 16 16 16 8
200 190 684 30 31 32 33 5
250 30 108 5 5 5 5 15
250 120 432 5 5 5 5 12
250 210 756 15 15 15 16 8
250 300 1080 30 31 32 32 5


Nominal sizes

125 – 250 mm

Volume flow rate range

8 – 300 l/s or 30 – 1080 m³/h

Volume flow rate control range

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

Minimum differential pressure

5 – 30 Pa

Maximum differential pressure

600 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.

LVC, Sound pressure level at differential pressure 50 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)

125

8

29

27

<15

<15

<15

<15

125

30

108

35

24

17

<15

17

125

55

198

39

30

24

21

21

125

75

270

42

34

28

25

23

160

12

43

29

19

<15

<15

<15

160

50

180

34

26

23

19

19

160

85

306

36

28

23

20

22

160

120

432

38

31

26

23

24

200

20

72

31

21

<15

<15

<15

200

75

270

35

26

19

17

19

200

135

486

36

28

22

20

22

200

190

684

36

28

23

21

24

250

30

108

31

24

18

16

17

250

120

432

36

28

22

19

25

250

210

756

36

28

22

20

28

250

300

1080

36

29

23

21

31

① LVC

② LVC with secondary silencer CS/CF, insulation thickness 50 mm, length 500 mm

③ LVC with secondary silencer CS/CF, insulation thickness 50 mm, length 1000 mm

④ LVC with secondary silencer CS/CF, insulation thickness 50 mm, length 1500 mm


Circular VAV terminal units for variable air volume systems with low airflow velocities, suitable for supply or extract air, available in four nominal sizes.

Measurement and control of low volume flow rates based on a new measurement principle. Plastic nozzle with damper blade for measuring the differential pressure upstream and downstream of the damper blade (effective pressure). The relation between damper blade position and differential pressure is stored as a characteristic relationship in the Easy or Compact controller. This results in high control accuracy even in case of unfavourable upstream conditions.

Selection based on nominal size determination.

Ready-to-commission unit which consists of the mechanical parts and the electronic control components. Units are equipped with a plastic nozzle with integral damper blade.

The averaging differential pressure sensor is resistant to dust and pollution.

Spigot with lip seal, for circular connecting ducts to EN 1506 or EN 13180.

Position of the damper blade indicated externally at shaft extension. Damper blade is factory set to open position which allows ventilation airflow even without control.

Closed blade air leakage to EN 1751, at least class 1.

Casing air leakage to EN 1751, class C.

Special features

  • Optimised for low airflow velocities from 0.6 to 6 m/s
  • High control accuracy even in case of unfavourable upstream conditions
  • Any installation orientation
  • Volume flow rate control with Easy or Compact controller
  • Casing length of only 310 mm

Materials and surfaces

  • Casing made of galvanised sheet steel
  • Nozzle, damper blade, and plain bearings made of ABS plastic, UL 94, flame retardant (V-0)
  • Damper blade seal made of TPV (plastic)

Technical data

  • Nominal sizes: 125 to 250 mm
  • Volume flow rate range: 8 to 300 l/s or 30 to 1080 m³/h
  • Volume flow rate control range: approx. 10 – 100 % of the nominal volume flow rate
  • Minimum differential pressure: 5 – 30 Pa
  • Maximum differential pressure: 600 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.

00134806_0

 Type
LVC       VAV terminal unit

 Nominal size [mm]
125
160
200
250

 Attachments (control component)
Easy       Easy controller
BC0       Compact controller

 

 Operating mode
E       Single
M       Master
S       Slave
F       Constant value

 Signal voltage range
       For the actual and setpoint value signals
0       0 – 10 V DC
2       2 – 10 V DC

 Volume flow rates [m3/h or l/s]
       Vmin – Vmax for factory setting

 

Attachments, Dimensions and weight, Product details

  • Attachments
  • Dimensions and weight
  • Product details

LVC, 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





BC0

Volume flow rate

Compact controller with MP bus interface TROX/Belimo

Dynamic, integral

Integral


Nominal size
ØD
mm
m
kg
125 124 1.5
160 159 1.9
200 199 2.1
250 249 2.7



The Easy principle

Installation details, Basic information and nomenclature

  • Installation details
  • Basic information and nomenclature

Installation and commissioning

  • Any installation orientation
  • Selection based on nominal size determination
  • Damper blade is factory set to open position which allows ventilation airflow even without control
  • Can be installed at a junction

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

370

200

300

Compact controller

370

200

200


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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Per domande di carattere generale riguardanti i nostri prodotti o servizi, è possibile contattare:
Tel.: +39 029829741 | Fax: +39 029829760