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 control technique
  • 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

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)

Technical information

  • 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.

Nominal sizes125 – 250 mm
Volume flow rate range8 – 300 l/s or 30 – 1080 m³/h
Volume flow rate control rangeApprox. 10 to 100 % of the nominal volume flow rate
Minimum differential pressure5 – 30 Pa
Maximum differential pressure600 Pa
Operating temperature10 – 50 °C


Quick sizing: Sound pressure level at differential pressure 50 Pa

Nominal sizeVVAir-regenerated noiseAir-regenerated noiseAir-regenerated noiseAir-regenerated noiseCase-radiated noise
Nominal sizeVV
Nominal sizeVVLPALPA1LPA1LPA1LPA2
Nominal sizel/sm³/hdB(A)dB(A)dB(A)dB(A)dB(A)
125 8 29 27<15<15<15<15
125 30 108 352417<1517
125 55 198 3930242121
125 75 270 4234282523
160 12 43 2919<15<15<15
160 50 180 3426231919
160 85 306 3628232022
160 120 432 3831262324
200 20 72 3121<15<15<15
200 75 270 3526191719
200 135 486 3628222022
200 190 684 3628232124
250 30 108 3124181617
250 120 432 3628221925
250 210 756 3628222028
250 300 1080 3629232131

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.

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

 

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Contact

Thank you for your message!

Visual contact Visual contact

Your message is send and will be processed shortly.
Our department for Service-Requests will contact you asap.
For general question regarding products or services you can also call:
Tel.: +49 (0)2845 / 202-0 | Fax: +49 (0)2845/202-265