Rectangular VAV terminal units for standard applications regarding the supply air or extract air control in variable air volume systems
Optional equipment and accessories
Application
Special characteristics
Nominal sizes
Parts and characteristics
Attachments
Useful additions
Construction features
Materials and surfaces
Mineral wool
Installation and commissioning
Maintenance
Maintenance-free as contruction and materials are not subject to wear
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.
*1 = LPA without attenuator TX
*2 = LPA with attenuator TX
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
Materials and surfaces
Mineral wool
Technical data
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
Electrical connections with screw terminal
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 |
Note
Controls enclosure size is dependent on the type of controller used
Standard maximum control enclosure size is 400 (L) x 350 (H) x 120 (D)
Description
VAV terminal unit, Variatn TVL
Dimensions
1 Compressible seal to be provided by others
2 Air duct profile to be provided by others
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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Tel.: +60 6 678 8188 | Fax: +60 6 678 8288 (388)
Contact
We are here for you
Please specify your message and type of request.
Tel.: +60 6 678 8188 | Fax: +60 6 678 8288 (388)
Contact
Thank you for your message!
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)
