Application
Special characteristics
Nominal sizes
Variants
Parts and characteristics
Attachments
Accessories
Useful additions
Construction features
Materials and surfaces
Variant with acoustic cladding (-D)
Mineral wool
Standards and guidelines
Maintenance
Functional description
The VAV terminal unit is fitted with two differential pressure sensors for measuring the volume flow rates, one in the cold air flow and one in the total air flow.
The control components (attachments) include two differential pressure transducers that transform the differential pressure (effective pressure) into an electric signal, two controllers, and two actuators; the control functions can be achieved with a Compact controller or with individual components.
In most cases, the setpoint value for the dual duct terminal unit comes from a room temperature controller.
The room temperature controller 'leads' the cold air volume flow controller and alters the setpoint for the cold air flow rate between 0 and the maximum volume flow Vmax. The controller compares the actual value with the setpoint value and alters the control signal of the damper actuator if there is a difference between the two values.
The warm/total air controller is set to the minimum volume flow rate Vmin and controls the warm air damper blade. As a consequence, a corresponding proportion of warm air is added. As the demand for cooling increases, the warm air damper blade closes such that eventually only cold air flows.
An integral attenuator reduces the noise that is created by the restriction of the airflow.
The airflow velocity at the room end is, due to the larger rectangular cross section, about half the velocity in the circular duct.
Volume flow rate ranges
The minimum differential pressure of VAV terminal units is an important factor in designing the ductwork 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.
The volume flow rates given for VAV terminal units depend on the nominal size and on the control component (attachment) that is installed. The table gives the minimum and maximum values for a VAV terminal unit. Some control components may only have a limited volume flow rate range. This applies in particular to control components with a static differential pressure transducer. For volume flow rate ranges for all control components refer to our Easy Product Finder design programme.
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① Pa |
② Pa | ± % | ||
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Nominal sizes | 125 – 400 mm |
Volume flow rate range | 45 – 1680 l/s or 162 – 6048 m³/h |
Volume flow rate control range | Approx. 30 to 100% of the nominal volume flow rate |
Minimum differential pressure | 120 Pa |
Maximum differential pressure | 1000 Pa |
Operating temperature | 10 – 50 °C |
Quick sizing tables provide a good overview of the room sound pressure levels that can be expected. Approximate intermediate values can be interpolated. Precise intermediate values and spectral data can be calculated with our Easy Product Finder design programme.
The first selection criteria for the nominal size are the actual volume flow rates Vmin and Vmax. The quick sizing tables are based on generally accepted attenuation levels. If the sound pressure level exceeds the required level, a larger air terminal unit and/or a silencer is required.
TVM, Sound pressure level at differential pressure 150 Pa
125 | 45 | 162 | 25 | 15 | 25 | 21 |
125 | 60 | 216 | 28 | 19 | 28 | 24 |
125 | 100 | 360 | 34 | 24 | 32 | 29 |
125 | 150 | 540 | 38 | 29 | 36 | 33 |
160 | 75 | 270 | 25 | 16 | 35 | 26 |
160 | 100 | 360 | 28 | 19 | 36 | 28 |
160 | 170 | 612 | 34 | 25 | 39 | 33 |
160 | 250 | 900 | 37 | 28 | 41 | 37 |
200 | 120 | 432 | 24 | 15 | 30 | 25 |
200 | 180 | 648 | 28 | 18 | 33 | 28 |
200 | 280 | 1008 | 31 | 21 | 36 | 33 |
200 | 405 | 1458 | 34 | 25 | 39 | 37 |
250 | 185 | 666 | 18 | 8 | 25 | 20 |
250 | 270 | 972 | 23 | 12 | 29 | 24 |
250 | 470 | 1692 | 30 | 19 | 34 | 30 |
250 | 615 | 2214 | 34 | 24 | 37 | 33 |
315 | 310 | 1116 | 21 | 8 | 30 | 27 |
315 | 420 | 1512 | 24 | 11 | 32 | 30 |
315 | 720 | 2592 | 31 | 18 | 35 | 33 |
315 | 1030 | 3708 | 37 | 26 | 38 | 35 |
400 | 505 | 1818 | 18 | 6 | 28 | 25 |
400 | 710 | 2556 | 23 | 9 | 32 | 29 |
400 | 1250 | 4500 | 31 | 16 | 37 | 35 |
400 | 1680 | 6048 | 37 | 21 | 40 | 38 |
① TVM, TVM-S
② TVM, TVM-S with secondary silencer TS
③ TVM-D, TVM-S-D
Rectangular VAV dual duct terminal units for dual duct systems with variable and constant volume flows, available in 6 nominal sizes.
Connecting spigots for warm and cold air arranged at an angle of 90°. Up to nominal size 200 an angle of 60° is also possible, hence ideal for for the refurbishment of older systems with dual duct units.
High control accuracy (even with upstream bend R = 1D).
Ready-to-commission unit which consists of the mechanical parts and the electronic control components. Each unit contains two averaging differential pressure sensors for volume flow rate measurement, one in the cold air flow and one in the total air flow, two damper blades, and an integral attenuator. Factory-assembled control components complete with wiring and tubing.
Differential pressure sensor with 3 mm measuring holes (resistant to dust and pollution)
On the fan end, spigot with groove for lip seal, suitable for connecting ducts to EN 1506 or EN 13180.
Room end suitable for the connection of air duct profiles.
Two baffle plates, one fitted after each damper blade for optimum acoustic and aerodynamic performance.
Casing with acoustic and thermal insulation.
Position of the damper blade indicated externally at shaft extension.
Closed blade air leakage to EN 1751, class 4 (nominal sizes 125 and 160, class 3).
Casing air leakage to EN 1751, class B.
Complies with VDI 2083, clean room class 3, and US standard 209E, class 100. Hygiene complies with VDI 6022, DIN 1946, part 4, as well as EN 13779 and VDI 3803.
Special characteristics
Materials and surfaces
Variant with acoustic cladding (-D)
Mineral wool
Technical data
Attachments
Variable volume flow control with electronic Compact controller to switch an external control signal and an actual value signal for integration into the central BMS.
Sizing data
This specification text describes the general properties of the product. Texts for variants can be generated with our Easy Product Finder design programme.
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Order example: TVM/160/BF0/E0/300–900 m³/h/0–900 m³/h
Spigot arrangement | 90° |
Acoustic cladding | Without |
Nominal size | 160 mm |
Attachment | Compact controller |
Operating mode | Single |
Signal voltage range | 0 – 10 V DC |
Volume flow rate, warm | 300 – 900 m³/h |
Volume flow rate, cold | 0 – 900 m³/h |
Attachments
Type Compact, dynamic
Type Compact, static
Type Universal, dynamic
Additional products
Type TS
TVM-S
TVM-S-D
TVM
TVM-D
TVM, VARYCONTROL control components
Easy controller | ||||
Easy | Volume flow rate | Easy controller TROX | Dynamic, integral | Integral |
Compact controller, dynamic | ||||
BC0 | Volume flow rate | Compact controller with MP bus interface TROX/Belimo | Dynamic, integral | Integral |
BM0 | Volume flow rate | Compact controller with Modbus RTU interface (with connecting cable) TROX/Belimo | Dynamic, integral | Integral |
BM0-J6 | Volume flow rate | Compact controller with Modbus RTU interface (with socket) TROX/Belimo | Dynamic, integral | Integral |
XB0 | Volume flow rate | Compact controller TROX/Gruner | Dynamic, integral | Integral |
LN0 | Volume flow rate | Compact controller Siemens | Dynamic, integral | Integral |
LK0 | Volume flow rate | Compact controller with KNX interface Siemens | Dynamic, integral | Integral |
Compact controller, static | ||||
SA0 | Volume flow rate | Compact controller with SLC interface Sauter | Static, integral | Integral |
SC0 | Volume flow rate | Compact controller with SLC interface Sauter | Static, integral | Fast-running actuator, integral |
Universal controller, dynamic | ||||
B13 | Volume flow rate | Universal controller TROX/Belimo | Dynamic, integral | Actuator |
LK0: Only for variants TVM and TVM-D (not for TVM-S and TVM-S-D)
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mm | mm | mm | mm | mm | mm | mm | mm | mm | mm | mm | mm | mm | mm | kg | |
Installation and commissioning
Upstream conditions
The volume flow rate accuracy ΔV 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. Some installation situations require straight duct sections upstream.
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.
Principal dimensions
ØD [mm]
VAV terminal units made of stainless steel: Outside diameter of the spigot
VAV terminal units made of plastic: Inside diameter of the connecting spigot
ØD₁ [mm]
Pitch circle diameter of flanges
ØD₂ [mm]
Outside diameter of flanges
ØD₄ [mm]
Inside diameter of the screw holes of flanges
L [mm]
Length of unit including connecting spigot
L₁ [mm]
Length of casing or acoustic cladding
B [mm]
Duct width
B₁ [mm]
Screw hole pitch of flange (horizontal)
B₂ [mm]
Outside dimension of flange (width)
B₃ [mm]
Width of device
H [mm]
Duct height
H₁ [mm]
Screw hole pitch of flange (vertical)
H₂ [mm]
Outside dimension of flange (height)
H₃ [mm]
Unit height
n [ ]
Number of flange screw holes
T [mm]
Flange thickness
m [kg]
Unit weight including the minimum required attachments (e.g. Compact controller)
Acoustic data
fm [Hz]
Octave band centre frequency
LPA [dB(A)]
A-weighted sound pressure level of air-regenerated noise of the VAV terminal unit, system attenuation taken into account
LPA1 [dB(A)]
A-weighted sound pressure level of air-regenerated noise of the VAV terminal unit with secondary silencer, system attenuation taken into account
LPA2 [dB(A)]
A-weighted sound pressure level of case-regenerated noise of the VAV terminal unit, system attenuation taken into account
LPA3 [dB(A)]
A-weighted sound pressure level of case-regenerated noise of the VAV terminal unit with acoustic cladding, system attenuation taken into account
All sound pressure levels are based on 20 μPa.
Volume flow rates
Vnom [m³/h] and [l/s]
Nominal volume flow rate (100 %)
Vmin unit [m³/h] and [l/s]
Technically possible minimum volume flow rate
Vmax [m³/h] and [l/s]
Upper limit of the operating range for the VAV terminal unit that can be set by customers
Vmin [m³/h] and [l/s]
Lower limit of the operating range for the VAV terminal unit that can be set by customers
V [m³/h] and [l/s]
Volume flow rate
ΔV [± %]
Volume flow rate tolerance from setpoint value
ΔVwarm [± %]
Volume flow rate tolerance for the warm air flow of dual duct terminal units
Differential pressure
Δpst [Pa]
Static differential pressure
Δpst min [Pa]
Static differential pressure, minimum
Construction
Galvanised sheet steel
Powder-coated surface (P1)
Stainless steel (A2)
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We are here for you
Please specify your message and type of request.
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Our department for Service-Requests will contact you asap.
For general question regarding products or services you can also call:
Tel.: +971 4 3417448 | Fax: +971 4 3417449