TYPE TVL

FOR NORMAL AND HIGH VOLUME FLOW RATE RANGE

Rectangular VAV terminal units for standard applications regarding the supply air or extract air control in variable air volume systems

  • Suitable for the control of volume flow rate, room pressure or duct pressure
  • Electronic control components for different applications (Easy, Compact, Universal)
  • High control accuracy
  • For volume flow rate ranges up to 36,360 m³/h or 10,000 l/s
  • Suitable for airflow velocities up to 10 m/s
  • Operation pressure 

Optional equipment and accessories

  • Secondary silencer Type TX for the reduction of air-regenerated noise
  • Hot water heat exchanger of Type WT for reheating the airflow
  • APPLICATION
  • DESCRIPTION

Application

  • Rectangular VARYCONTROL VAV terminal units of the typeTVL for supply air or extract airflow control in variable air volume systems
  • Closed-loop volume flow control using an external power supply
  • For controlling, restricting, or shutting off the airflow in air conditioning systems
  • Shut-off by means of switching (equipment supplied by others)


Special characteristics

  • Factory set-up or programming and aerodynamic function testing
  • Volume flow rate can later be measured and adjusted on site; additional adjustment device maybe necessary


Nominal sizes

  • 39 nominal sizes from 200 x 100 to 1000 x 1000

Parts and characteristics

  • Ready-to-commission unit which consists of mechanical parts and control components
  • Averaging differential pressure sensor for volume flow rate measurement
  • Damper blade
  • Factory assembled control components complete with wiring and tubing
  • Aerodynamic functional 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 volume flow rate control accuracy


Attachments

  • Easy controller : Compact unit consisting of controller with potentiometers, differential pressure transducer and actuator
  • Universal controller : Controller, differential pressure transducer and actuators for special applications


Useful additions

  • Secondary silencer Type TX for demanding acoustic requirements
  • Hot water heat exchanger Type WT (for more details, please contact TROX Malaysia)


Construction features

  • Rectangular casing
  • Aerofoil type damper blade in opposed blade confirguration
  • Position of the damper blade indicated externally at shaft extension



Materials and surfaces

  • Galvanized sheet steel contruction
  • Casing mode of galvanized sheet steel
  • Shaft made of galvanized steel
  • Damper blades and differential pressure sensor made of aluminum
  • Sintered bronze bearings


Mineral wool

  • Internal fibre glass insulation lining
  • Faced with woven glass fabric as protection against fibre erosion through air flow velocities of up to 20 m/s
  • Resistant to fungal and bacterial growth


Installation and commissioning

  • Damper blades have to be horizontal
  • Return edges of the casing with drilled holes suitable for M8 threaded rods


Maintenance

Maintenance-free as contruction and materials are not subject to wear

Technical information

Function, Quick selection, Aero dynamic data, Specification text, Order code

  • FUNCTION
  • QUICK SELECTION
  • AERO DYNAMIC DATA
  • SPECIFICATION TEXT
  • ORDER CODE
Schematic illustration of the TVL

Functional description

The VAV terminal unit is fitted with a differential pressure sensor for measuring the volume flow rate. The control components (attachments) include a differential pressure transducer that transforms the differential pressure (effective pressure) in to an electric signal, a controller, and an actuator; the control functions can be achieved with an Easy controller, with a Compact controller, or with individual components.

For most applications, the setpoint value comes from a room temperature controller. The controller compares the actual value with the setpoint and alters the control signal of the actuator if here is a difference between the two values.

Voume flow rate ranges

Quick selection tables provide a good overview of the room sound pressure levels that can be expected. Approximate intermediate values can be interpolated. Precise intermediate values please contact TROX Malaysia.

The first selection criteria for the nominal size are the actual volume flow rates Vmin and Vmax. The quick sizing tables are based on normally accepted attenuation levels. If the sound pressure level exceeds the required level, a larger VAV terminal unit and/or a silencer is required.

Air regenerated noise

The minimum differential pressure of VAV terminal units is an important factor in designing the duct work 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.

Rectangular VAV terminal units for variable and constant air volume systems, suitable for supply or extract air, available in 30 nominal sizes. high volume flow rate control accuracy. 

Ready-to-commission unit which consists of the mechanical parts and the electronic control components. Each unit contains an averaging differential pressure sensor for colume flow rate measurement, a damper blade. Factory assembles control components complete with wiring and tubing. Differential pressure sensor with measuring holes (resistant to duct and pollution), both ends suitable for the connection of ducts. Position of the damper blade indicated externally at shaft extension.

Special characteristics

  • Factory set-up or programming and aerodynamic function testing


Materials and surfaces

  • Casing made of galvanised sheet steel
  • Shafts made of galvanised steel
  • Damper blade and differential pressure sensor made of aluminium
  • Sintered bronze bearings

Mineral wool

  • Internal fibre glass insulation lining
  • Faced with Woven glass fabric as protection against erosion through airflow velocities of up to 20 m/s
  • Resistant to fungal and bacterial growth.


Technical data

  • Nominal sizes: 200 x 100 to 1000 x 1000 mm
  • Volume flow rate range: 45 to 10,100 l/s or 162 to 36,360 m³/h
  • Volume flow rate control range (unit with dynamic differential pressure measurement) : Approx. 20 to 100 % of the nominal volume flow rate
  • Minimum differential pressure: 50 Pa
  • Maximum differential pressure: 1000 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 to controller 24 V AC
  • Transformer step down from 230 V AC to 24 V
  • Signal voltages 0(2) - 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 taht commisioning and subsequent adjusmetn are simplified
  • Volume flow rate control range: approx. 20 - 100% of the nominal volume flow rate
  • Clearly visible external indicator light for signaling the functions: Set, notset and power failure

Electrical connections with screw terminal

VARYCONTROL

1 Type

    TVL       VAV terminal unit


2  Nominal size (mm)

    B x H


3  Attachments (control component)

    Specific controller name


4  Design flow range (l/s or CFM), differential 

    pressure (Pa)

    Vmin and Vmax for factory setting or Δpmin for factory        setting



Order example: TVL / 700 x 200 / 00 / 0 / 290 - 1450 l/s

Construction variation

normal

Norminal size

700 x 200 mm

Attachement

Controller

Volume flow rate

290 - 1450 l/s


 

Dimensions and weight

  • DIMENSIONS AND WEIGHT

Description

VAV terminal unit, Variatn TVL


Dimensions

1  Compressible seal to be provided by others

2  Air duct profile to be provided by others

Installation details

  • INSTALLATION DETAILS

Upstream conditions

The volume flow rate accuracy Δp 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. Some installation situations require straight duct sections upstream.

Bend

A bend - with a straight duct section of at least 2H upstream of the VAV terminal unit - has only a negligible effect on the volume flow rate accuracy.


Junction

A junction causes strong turbulence. The stated volume flow rate accuracy ΔV can only be achieved with a straight duct section of at least 4H upstream. Shorter upstream sections require a perforated plate in the branch and before the VAV terminal unit. If there is no straight upstream section at all, the control will not be stable, even with a perforated plate.


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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.: +60 6 678 8188 | Fax: +60 6 678 8288 (388)