LVC_img_01psd.png
VAV terminal unit Type LVC

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Easy controller LMV-D3A-F

Easy controller

 

LMV-D3L-MP-F_img_01psd.png
Compact controller LMV-D3L-MP-F

Compact controller

LVC_img_03psd.png
Nozzle for effective pressure measurement

Nozzle for effective pressure measurement

LVC_gc_05ai.png
For all upstream conditions

For all upstream conditions

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Tested to VDI 6022

Tested to VDI 6022

LVC_img_01psd.png
Easy_LMV-D3A-F_img_04psd.png
LMV-D3L-MP-F_img_01psd.png
LVC_img_03psd.png
LVC_gc_05ai.png
doc_graphic_000009.png

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 to use thanks to innovative control technology
  • 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

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General Informationen

Application

  • Circular VAV terminal units for use in ventilation and air conditioning systems
  • For controlling, restricting, or shutting off supply and extract air flows
  • For low airflow velocities and low duct pressures
  • Closed-loop volume flow control using an external power supply
  • For variable or constant volume flow systems
  • Shut-off by means of switching (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
  • Effective pressure measurements upstream and downstream of the damper blade
  • The relation between damper blade position and differential pressure is stored as a characteristic relationship in the controller



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
  • Wire clamping bracket
  • Double lip seal
  • Factory assembled control components complete with wiring and tubing
  • Aerodynamic functional testing on a special test rig before 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, effective pressure transducer and actuator
  • Compact controller: Compact unit consisting of controller with potentiometers, effective pressure transducer and actuator



Useful additions

  • Circular silencer Type CA, CS or CF



Construction features

  • Circular casing
  • Spigot with double lip seal, for circular 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

Meets the hygiene requirements of

  • EN 16798, Part 3
  • VDI 6022, Sheet 1
  • DIN 1946, Part 4
  • For other applicable standards and guidelines refer to the hygiene certificate

Casing leakage

  • EN 1751, Class C

Closed blade air leakage:

Nominal size 125

  • EN 1751, Class 2
  • Meets the general requirements of DIN 1946, part 4, with regard to the acceptable closed blade air leakage

Nominal sizes 160 – 250

  • EN 1751, Class 1

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 LVC LVC_gc_01ai.png

① Plastic nozzle

② Damper blade

③ Double lip seal

④ Easy controller

⑤ Volume flow rate scale

⑥ Wire clamping bracket


A new measurement principle makes it possible to measure low volume flow rates. The pressure is measured by means of a nozzle with pressure taps upstream and downstream of the damper blade. The Easy controller or the Compact controller of the LVC determines the resulting 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.

 


Nominal sizes125 – 250 mm
Volume flow rate range

9 – 300 l/s or 30 – 1080 m³/h


Volume flow rate control rangeApprox. 10 – 100 % of the nominal volume flow rate
Minimum differential pressure

Up to 33 Pa (without circular silencer)


Maximum differential pressure600 Pa
Operating temperature10 to 50 °C



 


Quick sizing tables provide a good overview of the minimum differential pressures, the volume flow rate accuracy and the room sound pressure levels that can be expected. Intermediate values may be achieved by interpolation.

The sound power levels for calculating the sound pressure levels were measured in the TROX laboratory according to DIN EN ISO 5135 - see "Basic information and nomenclature".

Precise results and spectral data for all control components can be calculated with our Easy Product Finder design program. The first selection criteria for the nominal size are the actual volume flow rates qvmin and qvmax.


Volume flow rate ranges and minimum differential pressure values

The minimum differential pressure of VAV terminal units is an important factor in designing the ductwork and in rating the fan including speed control. It must be ensured that for all operating conditions and for all terminal units a sufficient pressure differential is applied to each controller (Δpstat,min). 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.


Volume flow rate ranges and minimum differential pressure values

Controller for dynamic measurements

Attachment: Easy, BC0

NSqv [l/s]qv [m³/h]Δpstmin [Pa]Δqv [±%]
125930111115
1253111066779
12553190161819217
12575270333639416
1601345111116
1604817356669
16084302151617187
160119430303234366
2002070111116
2007627556669
200133480151617177
200190685313233356
25031110111116
25012043356669
250210757151616177
2503001080313233346

① Basic unit
② Basic unit with circular silencer CS/CF, insulation thickness 50 mm, length 500 mm
③ Basic unit with circular silencer CS/CF, insulation thickness 50 mm, length 1000 mm
④ Basic unit with circular silencer CS/CF, insulation thickness 50 mm, length 1500 mm

Quick sizing table for sound pressure level


The quick sizing tables are based on generally accepted attenuation and insulation levels. If the sound pressure level exceeds the required level, a larger air terminal unit and/or a silencer or acoustic cladding is required. For more information on the acoustic data, see basic information and nomenclature.



Quick sizing table for air-regenerated noise LPA
Controller including silencer


NSqv [l/s]qv [m³/h]150 Pa500 Pa
1259303920< 15< 1550312216
125311104732262358423631
125531905037322961474137
125752705240363263504541
16013454027211552383125
160481734533272356433631
160843024735312759453935
1601194304837333060464138
20020704230241953413429
200762754634292557453834
2001334804736312859464036
2001906854736322958464037
250311104334302654474239
2501204334739343059514642
2502107574739343059514642
25030010804739343059514642

Air-regenerated noise LPA [dB(A)] with static differential pressure Δpst of 150 or 500 Pa

① Basic unit

② Basic unit with circular silencer CS/CF, insulation thickness 50 mm, length 500 mm

③ Basic unit with circular silencer CS/CF, insulation thickness 50 mm, length 1000 mm

④ Basic unit with circular silencer CS/CF, insulation thickness 50 mm, length 1500 mm

 

Quick sizing table for case-radiated noise LPA

NSqv [l/s]qv [m³/h]150 Pa500 Pa
1259302234
125311102841
125531903143
125752703345
16013452134
160481732942
160843023245
1601194303447
20020702235
200762752943
2001334803246
2001906853448
250311102840
2501204333548
2502107573851
25030010804053

Case-radiated noise LPA [dB(A)] with static differential pressure Δpst of 150 or 500 Pa

 Note:

Information on case-radiated noise for combinations of basic unit and secondary silencer can be found in the Easy Product Finder design program.


Specification text


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 effective pressure upstream and downstream of the damper blade. 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 effective pressure sensor is resistant to contamination. Spigots with double lip seal, suitable for 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, class 2 (nominal sizes 160 – 250, class 1). Casing air leakage to EN 1751, class C. Meets the hygiene requirements of EN 16798, Part 3, of VDI 6022, Sheet 1, and of DIN 1946, Part 4.


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
  • Effective pressure measurements upstream and downstream of the damper blade
  • The relation between damper blade position and differential pressure is stored as a characteristic relationship in the controller


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



Equivalence criteria



  • Declaration of hygiene conformity in accordance with VDI 6022, Sheet 1 (01/2018), ÖNORM H 6020 (02/2007) and ÖNORM H 6021 (09/2003)
  • Setting the volume flow rates without adjustment device via Vmin-  and Vmaxpotentiometers
  • Electrical connections with screw terminals, no additional terminal boxes required
  • Aerodynamic functional testing of each volume flow controller on a test rig before shipping (test result on a sticker on the controller)
  • No upstream section required
  • Acoustic data to ÖNORM EN ISO 5135:1999
  • Maximum control deviation of 6 % at qvmax, without upstream section
  • Test


Connection


  • Spigot with groove for lip seal, suitable for connecting ducts according to EN 1506 or EN 13180.


Technical data

  • Nominal sizes: 125 to 250 mm
  • Volume flow rate range: 9 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: up to 33 Pa (without circular silencer)
  • Maximum differential pressure: 600 Pa


    Attachments


    Variable volume flow control with electronic Easy controller for applying a reference value and capturing an actual value to be integrated with 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: CLOSE, OPEN, qvmin and qvmax
    • Potentiometers with percentage scales to set the volume flow rates qvmin and qvmax
    • 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



    Order code for volume flow control (with Easy attachment)

    LVC / 160 / Easy
    |||
    123

    1 Type 
    LVC VAV terminal unit
     
    2 Nominal size [mm]
    125
    160
    200
    250
     
    3 Attachments (control components)
    Easy Volume flow controller, dynamic, analogue interface, setting qvmin and qvmax with potentiometers

     Order example: LVC/160/Easy

    Nominal size160 mm
    Attachments (control components)Easy controller


     Order code for volume flow control (with Compact controller attachment)


    LVC / 160 / BC0 / V0 / 80 – 400 [m³/h]
    ||||||
    123456


    1 Type
    LVC VAV terminal unit


    2 Nominal size [mm]
    125
    160
    200
    250 

    3 Attachments (control components)
    BC0 Compact controller 

    4 Operating mode

    F Constant value (one setpoint value)
    V Variable (setpoint value range) 

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

    6 Operating values for factory setting
    Volume flow rates [m3/h or l/s]
    qvconst (with operating mode F)
    qvmin – qvmax (with operating mode V)


    Order example: LVC/125/BC0/V2/100–200 m³/h
    Nominal size125 mm
    Attachments (control components)Compact controller, dynamic transducer, analogue and MP bus interfaces
    Operating modeVariable
    Signal voltage range2 – 10 V DC
    Operating valuesqvmin = 100 m³/hqvmax = 200 m³/h

    Attachments, Dimensions and Weight, Product details

    • VARIANTS
    • DIMENSIONS AND WEIGHT
    • PRODUCT DETAILS
    VAV terminal unit Type LVC LVC_img_01psd.png


    • VAV terminal unit for variable volume flow control
    • Spigot with double lip seal


    • Runde VVS-Regelgeräte für den Einsatz in raumlufttechnischen Anlagen (RLT-Anlagen)
    • Für Regel-, Drossel- und Absperraufgaben im Zuluft- oder Abluftbereich
    • Für niedrige Luftgeschwindigkeiten und niedrige Kanaldrücke
    • Volumenstromregelung im geschlossenen Regelkreis mit Hilfsenergie
    • Für variable oder konstante Volumenstromsysteme
    • Absperrung durch kundenseitige Zwangsschaltung

    NS∅Dkg
    1251241.5
    1601591.9
    2001992.1
    2502492.7


    VARYCONTROL control components


    AttachmentControlled variableInterfaceEffective pressure transducerActuatorManufacturer
    Easy controller, dynamic
    Easy

    qv

    0 – 10 Vintegralslow-running

    integral
    Compact controller, dynamic
    BC0

    -


    0 – 10 V or 2 – 10 V or MP bus interfaceintegralslow-running

    integral

    qv Volume flow rate

    ① TROX, ② TROX/Belimo



    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 Δqᵥ 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.


    Installation details

    • INSTALLATION DETAILS

     

    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 for attachments


    Attachment

    VARYCONTROL












    Easy controller: Easy


    370200300


    Compact controller: BC0


    370200200

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