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
small_tab1_Serie LVC-LowVelocity
  • 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)

Información técnica

  • Function
  • Technik
  • Quick sizing
  • Specification text
  • Order code
lvc

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.

lvc
lvc

 

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 – 250 mm
  • Volume flow rate range:  8 – 300 l/s or 30 – 1080 m³/h
  • Volume flow rate control range: approx. 10 – 100 % of the nominal volume flow rate
  • Running time for 90°: 90°: 110 – 150 s
  • 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 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.

lvc

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Estamos aquí para atenderles

Visual contact Visual contact

Por favor mande su solicitud
Tel.: +34 976 50 02 50 | Fax: +34 976 50 09 04

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Los campos marcados con un (*) sin imprescindibles de cumplimentar

Contacto

Gracias por su mensaje.

Visual contact Visual contact

Su mensaje ha sido enviado correctamente, en breve será atendido.
En seguida nos pondremos en contacto con Vd.
Para información general sobre productos o servicios, por favor llamar al:
Tel.: +34 976 50 02 50 | Fax: +34 976 50 09 04