VAV dual duct terminal units for dual duct systems with variable volume flows in buildings with demanding acoustic requirements
Optional equipment and accessories
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 V_{max}. 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 V_{min} 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.
l/s  m³/h 
① Pa 
② Pa  ± %  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


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 V_{min} and V_{max}. 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, TVMS
② TVM, TVMS with secondary silencer TS
③ TVMD, TVMSD
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).
Readytocommission 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. Factoryassembled 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.
TVMS
TVMSD
TVM
TVMD
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 
BM0J6  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  Fastrunning actuator, integral 
Universal controller, dynamic  
B13  Volume flow rate  Universal controller TROX/Belimo  Dynamic, integral  Actuator 
LK0: Only for variants TVM and TVMD (not for TVMS and TVMSD)
Attachments: VARYCONTROL control components
Easy controller  Dynamic  
Easy  V  Integral  Integral  ①  ●  ●  ●  ●  ●  ●  ●  ●  
Compact controller  Dynamic  
BC0  V  MP bus  Integral  Integral  ②  ●  ●  ●  ●  ●  ●  ●  ●  
BF0  V  MP bus  Integral  Integral  ②  ●  
BL0  V  LonWorks  Integral  Integral  ②  ●  ●  ●  ●  ●  ●  ●  
BM0  V  Modbus  Integral  Integral  ②  
BM0J6  V  Modbus and plugin connecting cable  Integral  Integral  ②  
XG0  V  Integral  Integral  ③  ●  
XB0  V  Integral  Integral  ③  ●  ●  ●  ●  ●  ●  ●  
LN0  V  Integral  Integral  ⑤  ●  ●  ●  ●  ●  ●  ●  
LK0  V  KNX  ⑤  
LY0  V  Integral  Integral  ⑤  ●  
Compact controller  Static  
SA0  V  Integral  Integral  ④  
SC0  Δp  Integral  Fastrunning actuator, integral  ④  
Universal controller  Dynamic  
B11  V  Integral  Actuator, torque for TVT  ②  ●  
B13  V  Integral  Actuator  ②  ●  ●  ●  ●  ●  ●  
B27  V  Integral  Actuator  ②  ●  
B1B  V  Integral  Spring return actuator  ②  ●  ●  ●  ●  ●  ●  ●  
XC3  V  Integral  Spring return actuator  ③  ●  ●  ●  ●  ●  ●  ●  
Universal controller  Static  
BP1  V  MP bus  Separate part  Actuator, torque for TVT  ②  ●  
BP3  V  MP bus  Separate part  Actuator  ②  ●  ●  ●  ●  ●  ●  ●  ●  
BPB  V  MP bus  Separate part  Spring return actuator  ②  ●  ●  ●  ●  ●  ●  ●  ●  
BPG  V  MP bus  Separate part  Fastrunning actuator  ②  ●  ●  ●  ●  ●  ●  ●  ●  ●  
BB1  V  Separate part  Actuator, torque for TVT  ②  ●  
BB3  V  Separate part  Actuator  ②  ●  ●  ●  ●  ●  ●  ●  ●  
BBB  V  Separate part  Spring return actuator  ②  ●  ●  ●  ●  ●  ●  ●  
XD1  V  Integral  Actuator  ③  ●  ●  ●  ●  ●  ●  ●  ●  
XD3  V  Integral  Spring return actuator  ③  ●  ●  ●  ●  ●  ●  ●  ●  
BR1  Δp  MP bus  100 Pa  Actuator, torque for TVT  ②  ●  
BR3  Δp  MP bus  100 Pa  Actuator  ②  ●  ●  ●  ●  ●  ●  ●  
BRB  Δp  MP bus  100 Pa  Spring return actuator  ②  ●  ●  ●  ●  ●  ●  ●  ●  
BRG  Δp  MP bus  100 Pa  Fastrunning actuator  ②  ●  ●  ●  ●  ●  ●  
BS1  Δp  MP bus  600 Pa  Actuator, torque for TVT  ②  ●  
BS3  Δp  MP bus  600 Pa  Actuator  ②  ●  ●  ●  ●  
BSB  Δp  MP bus  600 Pa  Spring return actuator  ②  ●  ●  ●  ●  
BSG  Δp  MP bus  600 Pa  Fastrunning actuator  ②  ●  ●  ●  ●  
BG1  Δp  100 Pa  Actuator, torque for TVT  ②  ●  
BG3  Δp  100 Pa  Actuator  ②  ●  ●  ●  ●  ●  ●  ●  
BGB  Δp  100 Pa  Spring return actuator  ②  ●  ●  ●  ●  ●  ●  ●  ●  
BH1  Δp  600 Pa  Actuator, torque for TVT  ②  ●  
BH3  Δp  600 Pa  Actuator  ②  ●  ●  ●  
BHB  Δp  600 Pa  Spring return actuator  ②  ●  ●  ●  ●  
XE1  Δp  Integral, 100 Pa  Actuator  ③  ●  ●  ●  ●  ●  ●  ●  ●  
XE3  Δp  Integral, 100 Pa  Spring return actuator  ③  ●  ●  ●  ●  ●  ●  ●  ●  
XF1  Δp  Integral, 600 Pa  Actuator  ③  ●  ●  ●  ●  
XF3  Δp  Integral, 600 Pa  Spring return actuator  ③  ●  ●  ●  ● 
① TROX, ② TROX/Belimo, ③ TROX/Gruner, ④ Sauter, ⑤ Siemens
☒ order code detail, V volume flow rate, Δp differential pressure
Attachments: VARYCONTROL control components
Easy controller  Dynamic  
Easy  V  Integral  Integral  ①  ●  ●  ●  ●  ●  ●  ●  ●  
Compact controller  Dynamic  
BC0  V  MP bus  Integral  Integral  ②  ●  ●  ●  ●  ●  ●  ●  ●  
BF0  V  MP bus  Integral  Integral  ②  ●  
BL0  V  LonWorks  Integral  Integral  ②  ●  ●  ●  ●  ●  ●  ●  
BM0  V  Modbus  Integral  Integral  ②  
BM0J6  V  Modbus and plugin connecting cable  Integral  Integral  ②  
XG0  V  Integral  Integral  ③  ●  
XB0  V  Integral  Integral  ③  ●  ●  ●  ●  ●  ●  ●  
LN0  V  Integral  Integral  ⑤  ●  ●  ●  ●  ●  ●  ●  
LK0  V  KNX  ⑤  
LY0  V  Integral  Integral  ⑤  ●  
Compact controller  Static  
SA0  V  Integral  Integral  ④  
SC0  Δp  Integral  Fastrunning actuator, integral  ④  
Universal controller  Dynamic  
B11  V  Integral  Actuator, torque for TVT  ②  ●  
B13  V  Integral  Actuator  ②  ●  ●  ●  ●  ●  ●  
B27  V  Integral  Actuator  ②  ●  
B1B  V  Integral  Spring return actuator  ②  ●  ●  ●  ●  ●  ●  ●  
XC3  V  Integral  Spring return actuator  ③  ●  ●  ●  ●  ●  ●  ●  
Universal controller  Static  
BP1  V  MP bus  Separate part  Actuator, torque for TVT  ②  ●  
BP3  V  MP bus  Separate part  Actuator  ②  ●  ●  ●  ●  ●  ●  ●  ●  
BPB  V  MP bus  Separate part  Spring return actuator  ②  ●  ●  ●  ●  ●  ●  ●  ●  
BPG  V  MP bus  Separate part  Fastrunning actuator  ②  ●  ●  ●  ●  ●  ●  ●  ●  ●  
BB1  V  Separate part  Actuator, torque for TVT  ②  ●  
BB3  V  Separate part  Actuator  ②  ●  ●  ●  ●  ●  ●  ●  ●  
BBB  V  Separate part  Spring return actuator  ②  ●  ●  ●  ●  ●  ●  ●  
XD1  V  Integral  Actuator  ③  ●  ●  ●  ●  ●  ●  ●  ●  
XD3  V  Integral  Spring return actuator  ③  ●  ●  ●  ●  ●  ●  ●  ●  
BR1  Δp  MP bus  100 Pa  Actuator, torque for TVT  ②  ●  
BR3  Δp  MP bus  100 Pa  Actuator  ②  ●  ●  ●  ●  ●  ●  ●  
BRB  Δp  MP bus  100 Pa  Spring return actuator  ②  ●  ●  ●  ●  ●  ●  ●  ●  
BRG  Δp  MP bus  100 Pa  Fastrunning actuator  ②  ●  ●  ●  ●  ●  ●  
BS1  Δp  MP bus  600 Pa  Actuator, torque for TVT  ②  ●  
BS3  Δp  MP bus  600 Pa  Actuator  ②  ●  ●  ●  ●  
BSB  Δp  MP bus  600 Pa  Spring return actuator  ②  ●  ●  ●  ●  
BSG  Δp  MP bus  600 Pa  Fastrunning actuator  ②  ●  ●  ●  ●  
BG1  Δp  100 Pa  Actuator, torque for TVT  ②  ●  
BG3  Δp  100 Pa  Actuator  ②  ●  ●  ●  ●  ●  ●  ●  
BGB  Δp  100 Pa  Spring return actuator  ②  ●  ●  ●  ●  ●  ●  ●  ●  
BH1  Δp  600 Pa  Actuator, torque for TVT  ②  ●  
BH3  Δp  600 Pa  Actuator  ②  ●  ●  ●  
BHB  Δp  600 Pa  Spring return actuator  ②  ●  ●  ●  ●  
XE1  Δp  Integral, 100 Pa  Actuator  ③  ●  ●  ●  ●  ●  ●  ●  ●  
XE3  Δp  Integral, 100 Pa  Spring return actuator  ③  ●  ●  ●  ●  ●  ●  ●  ●  
XF1  Δp  Integral, 600 Pa  Actuator  ③  ●  ●  ●  ●  
XF3  Δp  Integral, 600 Pa  Spring return actuator  ③  ●  ●  ●  ● 
① TROX, ② TROX/Belimo, ③ TROX/Gruner, ④ Sauter, ⑤ Siemens
☒ order code detail, V volume flow rate, Δp differential pressure
Attachments: LABCONTROL control components
Easylab controller  Static  
Elab  Room supply air Room extract air Room pressure Single controller  TCU3  Integral  Fastrunning actuator  ●  ●  ●  
Elab  Room supply air Room pressure Single controller  TCU3  Integral  Fastrunning actuator  ●  ●  
Elab  Room extract air Room pressure Single controller  TCU3  Integral  Fastrunning actuator  ●  ●  
Elab  Room supply air Room extract air Room pressure Fume cupboard Single controller  TCU3  Integral  Fastrunning actuator  ●  ●  
Electronic controller  Static  
TMA  Room supply air Room extract air Room pressure  TCULONII with LonWorks interface  Integral  Fastrunning actuator  ●  ●  ●  
TMB  Fastrunning actuator (brushless motor)  ●  ●  ●  
TMA  Room supply air Room pressure  TCULONII with LonWorks interface  Integral  Fastrunning actuator  ●  ●  
TMB  Fastrunning actuator (brushless motor)  ●  ●  
TMA  Room extract air Room pressure  TCULONII with LonWorks interface  Integral  Fastrunning actuator  ●  ●  
TMB  Fastrunning actuator (brushless motor)  ●  ●  
TMA  Room supply air Room extract air Room pressure Fume cupboard  TCULONII with LonWorks interface  Integral  Fastrunning actuator  ●  ●  
TMB  Fastrunning actuator (brushless motor)  ●  ● 
mm  mm  mm  mm  mm  mm  mm  mm  mm  mm  mm  mm  kg  
mm  mm  mm  mm  mm  mm  mm  mm  mm  mm  mm  mm  kg  
mm  mm  mm  mm  mm  mm  mm  mm  mm  mm  mm  mm  mm  mm  kg  
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
f_{m} [Hz]
Octave band centre frequency
L_{PA} [dB(A)]
Aweighted sound pressure level of airregenerated noise of the VAV terminal unit, system attenuation taken into account
L_{PA1} [dB(A)]
Aweighted sound pressure level of airregenerated noise of the VAV terminal unit with secondary silencer, system attenuation taken into account
L_{PA2} [dB(A)]
Aweighted sound pressure level of caseregenerated noise of the VAV terminal unit, system attenuation taken into account
L_{PA3} [dB(A)]
Aweighted sound pressure level of caseregenerated 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
V_{nom} [m³/h] and [l/s]
Nominal volume flow rate (100 %)
V_{min unit} [m³/h] and [l/s]
Technically possible minimum volume flow rate
V_{max} [m³/h] and [l/s]
Upper limit of the operating range for the VAV terminal unit that can be set by customers
V_{min} [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
ΔV_{warm} [± %]
Volume flow rate tolerance for the warm air flow of dual duct terminal units
Differential pressure
Δp_{st} [Pa]
Static differential pressure
Δp_{st min} [Pa]
Static differential pressure, minimum
Construction
Galvanised sheet steel
Powdercoated surface (P1)
Stainless steel (A2)
Share page
Recommend this page
Recommend this page by sending a link by mail.
Share page
Thank you for your recommendation!
Your recommendation has been sent and should arrive shortly.
Contact
We are here for you
Please specify your message and type of request.
Tel.: +61 (02) 8923 2551
Contact
Thank you for your message!
Your message is send and will be processed shortly.
Our department for ServiceRequests will contact you asap.
For general question regarding products or services you can also call:
Tel.: +61 (02) 8923 2551
Contact
We are here for you
Please specify your message and type of request.
Tel.: +61 (02) 8923 2551
Contact
Thank you for your message!
Your message is send and will be processed shortly.
Our department for ServiceRequests will contact you asap.
For general question regarding products or services you can also call:
Tel.: +61 (02) 8923 2551