Type TVM

For dual duct systems

VAV dual duct terminal units for dual duct systems with variable volume flows in buildings with demanding acoustic requirements

Individual temperature control for each room or zone
Highly effective integral attenuator
Electronic control components for different applications (Compact and Universal)
Suitable for airflow velocities up to 13 m/s
Closed blade air leakage to EN 1751, up to class 4
Casing air leakage to EN 1751, class A

Optional equipment and accessories

Acoustic cladding for the reduction of case-radiated noise
Secondary silencer Type TS for the reduction of air-regenerated noise

VAV dual duct terminal unit, variant TVM 00132456_0

Tested to VDI 6022

Application

VARYCONTROL VAV dual duct terminal units of Type TVM for the supply air control in dual duct variable or constant air volume systems
Closed-loop volume flow control using an external power supply
For maximum acoustic and thermal comfort
Demand-based mixing of cold and warm air
Shut-off by means of switching (equipment supplied by others)

Special characteristics

Integral differential pressure sensor with 3 mm measuring holes (resistant to dust and pollution)
Integral attenuator with at least 26 dB insertion loss at 250 Hz
Factory set-up or programming and aerodynamic function testing
Volume flow rate can later be measured and adjusted on site; additional adjustment device may be necessary
Inspection access for cleaning to VDI 6022

Nominal sizes

TVM-S: 125, 160, 200
TVM: 125, 160, 200, 250, 315, 400

Variants

TVM-S Dual duct unit, 60° spigot arrangement
TVM-S-D Dual duct unit with acoustic cladding, 60° spigot arrangement
TVM: Dual duct unit, 90° spigot arrangement
TVM-D: Dual duct unit with acoustic cladding, 90° spigot arrangement
Units with acoustic cladding and/or secondary silencer Type TS for very demanding acoustic requirements
Acoustic cladding cannot be retrofitted

Parts and characteristics

Ready-to-commission unit which consists of mechanical parts and control components.
Averaging differential pressure sensors for volume flow rate measurement, one in the cold air spigot and one in the silencer
Damper blade
Integral attenuator
Inspection access
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 control accuracy (even with upstream bend R = 1D)

Attachments

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

Accessories

Lip seals (factory fitted)

Useful additions

Secondary silencer Type TS

Construction features

Rectangular casing
Spigot on the fan end suitable for circular ducts to EN 1506 or EN 13180
Spigot with groove for lip seal
Connection on the room end suitable for air duct profiles
Baffle plate is fitted after the damper blade for optimum aerodynamic performance
Position of the damper blade indicated externally at shaft extension
Thermal and acoustic insulation (lining)

Materials and surfaces

Casing and damper blade made of galvanised sheet steel
Damper blade seal made of TPE plastic
Lining is mineral wool
Differential pressure sensor made of aluminium
Plastic bearings

Variant with acoustic cladding (-D)

Acoustic cladding made of galvanised sheet steel
Lining is mineral wool
Rubber elements for the insulation of structure-borne noise

Mineral wool

To EN 13501, fire rating class A1, non-combustible
RAL quality mark RAL-GZ 388
Biosoluble and hence hygienically safe according to the German TRGS 905 (Technical Rules for Hazardous Substances) and EU directive 97/69/EG
Faced with glass fibre fabric as protection against erosion through airflow velocities of up to 20 m/s
Inert to fungal and bacterial growth

Standards and guidelines

Hygiene conforms to VDI 6022
VDI 2083, air cleanliness class 3, and US standard 209E, class 100
Closed blade air leakage to EN 1751, class 4 (nominal sizes 125 and 160, class 3).
Nominal sizes 125 and 160 meet the general requirements, nominal sizes 200 – 400 meet the increased requirements of DIN 1946, part 4, with regard to the acceptable closed blade air leakage
Casing air leakage to EN 1751, class A

Maintenance

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

Technical information

Function, Technical data, Quick sizing, Specification text, Order code, Related Products

Schematic illustration of the TVM-S

① Damper blade – cold air
② Lip seal
③ Differential pressure sensor – cold air
④ Control components, e. g. a Compact controller
⑤ Inspection access
⑥ Differential pressure sensor – total air
⑦ Acoustic insulation
⑧ Damper blade – warm air

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.

Nominal size	V l/s	V m³/h	① ∆p_{st min} Pa	② ∆p_{st min} Pa	∆V ± %	∆V_warm
125	45	162	120	160	8	17
125	60	216	120	160	7	15
125	100	360	120	160	5	12
125	150	540	120	160	5	7
160	75	270	120	140	8	17
160	100	360	120	140	7	15
160	170	612	120	140	5	12
160	250	900	120	140	5	7
200	120	432	120	140	8	17
200	180	648	120	140	7	15
200	280	1008	120	140	5	12
200	405	1458	120	140	5	7
250	185	666	120	145	8	17
250	270	972	120	145	7	15
250	470	1692	120	145	5	12
250	615	2214	120	145	5	7
315	310	1116	120	160	8	17
315	420	1512	120	160	7	15
315	720	2592	120	160	5	12
315	1030	3708	120	160	5	7
400	505	1818	120	160	8	17
400	710	2556	120	160	7	15
400	1250	4500	120	160	5	12
400	1680	6048	120	160	5	7

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

Nominal size	V		Air-regenerated noise		Case-radiated noise
Nominal size	V		①	②	①	③
Nominal size	V		L_PA	L_PA1	L_PA2	L_PA3
Nominal size	l/s	m³/h	dB(A)
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

Integral differential pressure sensor with 3 mm measuring holes (resistant to dust and pollution)
Integral attenuator with at least 26 dB insertion loss at 250 Hz
Factory set-up or programming and aerodynamic function testing
Volume flow rate can later be measured and adjusted on site; additional adjustment device may be necessary
Inspection access for cleaning to VDI 6022

Materials and surfaces

Casing and damper blade made of galvanised sheet steel
Damper blade seal made of TPE plastic
Lining is mineral wool
Differential pressure sensor made of aluminium
Plastic bearings

Variant with acoustic cladding (-D)

Acoustic cladding made of galvanised sheet steel
Lining is mineral wool
Rubber elements for the insulation of structure-borne noise

Mineral wool

To EN 13501, fire rating class A1, non-combustible
RAL quality mark RAL-GZ 388
Biosoluble and hence hygienically safe according to the German TRGS 905 (Technical Rules for Hazardous Substances) and EU directive 97/69/EG
Faced with glass fibre fabric as protection against erosion through airflow velocities of up to 20 m/s
Inert to fungal and bacterial growth

Technical data

Nominal sizes: 125 to 400 mm
Volume flow rate range: 45 to 1680 l/s or 162 to 6048 m³/h
Volume flow rate control range: approx. 30 – 100 % of the nominal volume flow rate
Minimum differential pressure: 120 Pa
Maximum differential pressure: 1000 Pa

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.

Supply voltage 24 V AC/DC
Signal voltages 0 – 10 V DC or 2 – 10 V DC
Possible override controls with external switches using volt-free contacts: CLOSED, OPEN, V_min and V_max
Volume flow rate control range: approx. 30 – 100 % of the nominal volume flow rate

Sizing data

V_{warm, min}– V_{warm, max}[m³/h]
V_{cold, min}– V_{cold, max}[m³/h]
Δp_st[Pa]
L_PA air-regenerated noise[dB(A)]
L_PA Case-radiated noise[dB(A)]

This specification text describes the general properties of the product. Texts for variants can be generated with our Easy Product Finder design programme.

                                                                              Type
                                                                                                                                                                  TVM       Dual duct terminal unit

                                                                              Spigot arrangement
                                                                                    No entry: 90°
                                                                                                                                                                  S       60° (up to nominal size 200)

                                                                              Acoustic cladding
                                                                                    No entry: none
                                                                                                                                                                  D       With acoustic cladding

                                                                              Nominal size [mm]
                                                                                                                                                                  125
                                                                                                                                                                  160
                                                                                                                                                                  200
                                                                                                                                                                  250
                                                                                                                                                                  315
                                                                                                                                                                  400

                                                                              Accessories
                                                                                    No entry: none
                                                                                                                                                                  D2       Lip seal

                                                                              Attachments (control component)
                                                                                    Example
                                                                                                                                                                  BC0       Compact controller
                                                                                                                                                                  B13       Universal controller

                                                                              Operating mode
                                                                                                                                                                  E       Single
                                                                                                                                                                  M       Master
                                                                                                                                                                  F       Constant value

                                                                              Signal voltage range
                                                                                    For the actual and setpoint value signals
                                                                                                                                                                  0       0 – 10 V DC
                                                                                                                                                                  2       2 – 10 V DC

                                                                              Volume flow rates [m³/h or l/s]
                                                                                    V_{warm, min} – V_{warm, max} / V_{cold, min} – V_{cold, max}       for factory setting

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

Variants, Attachments, Dimensions and weight, Product details

VAV dual duct terminal unit, variant TVM-S

TVM-S

VAV terminal unit for the control of variable supply air volume flows
Connecting spigots for warm and cold air arranged at an angle of 60°

TVM-S-D

VAV terminal unit with acoustic cladding for the control of variable supply air volume flows
Connecting spigots for warm and cold air arranged at an angle of 60°
For rooms where the case-radiated noise of the unit is not sufficiently reduced by a false ceiling
The circular ducts for the room under consideration must have adequate acoustic insulation (provided by others) on the fan end
Acoustic cladding cannot be retrofitted

TVM

VAV terminal unit for the control of variable supply air volume flows
Connecting spigots for warm and cold air arranged at an angle of 90°

TVM-D

VAV terminal unit with acoustic cladding for the control of variable supply air volume flows
Connecting spigots for warm and cold air arranged at an angle of 90°
For rooms where the case-radiated noise of the unit is not sufficiently reduced by a false ceiling
The circular ducts for the room under consideration must have adequate acoustic insulation (provided by others) on the fan end
Acoustic cladding cannot be retrofitted

TVM, VARYCONTROL control components

Order code detail	Controlled variable	Controller	Differential pressure transducer	Actuator
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)

TVM-S

① Inspection access
② Keep clear to provide access to attachments

Nominal size	ØD mm	L mm	B₃ mm	H₃ mm	L₁ mm	B mm	B₁ mm	H mm	H₁ mm	A mm	B₄ mm	W mm	m kg
125	124	1385	300	236	1190	198	232	152	186	245	525	173	30
160	159	1630	410	236	1360	308	342	152	186	335	690	173	35
200	199	1920	560	281	1660	458	492	210	244	340	800	173	50

Nominal size	ØD mm	L mm	B₃ mm	H₃ mm	L₁ mm	B mm	B₁ mm	H mm	H₁ mm	A mm	B₄ mm	W mm	m kg
125	124	1385	380	316	1215	198	232	152	186	225	525	160	45
160	159	1630	490	316	1410	308	342	152	186	295	690	180	55
200	199	1920	640	361	1710	458	492	210	244	300	800	180	80

Nominal size	ØD mm	L mm	B₃ mm	H₃ mm	L₁ mm	B mm	B₁ mm	H mm	H₁ mm	A mm	A₁ mm	C mm	C₁ mm	W mm	m kg
125	124	1355	300	236	1205	198	232	152	186	150	170	125	240	265	28
160	159	1455	410	236	1255	308	342	152	186	200	150	145	295	265	34
200	199	1790	560	281	1590	458	492	210	244	200	125	170	350	265	50
250	249	2015	700	311	1765	598	632	201	235	250	160	200	415	540	65
315	314	2090	900	361	1840	798	832	252	286	250	130	240	535	540	90
400	399	2575	1000	446	2325	898	932	354	388	250	180	290	625	540	130

Nominal size	ØD mm	L mm	B₃ mm	H₃ mm	L₁ mm	B mm	B₁ mm	H mm	H₁ mm	A mm	A₁ mm	C mm	C₁ mm	W mm	m kg
125	124	1355	380	316	1245	198	232	152	186	110	130	165	280	305	42
160	159	1455	490	316	1295	308	342	152	186	160	110	185	335	305	51
200	199	1790	640	361	1630	458	492	210	244	160	85	210	390	305	78
250	249	2015	780	391	1805	598	632	201	235	210	120	240	455	580	105
315	314	2090	980	441	1880	798	832	252	286	210	90	280	575	580	140
400	399	2575	1080	526	2365	898	932	354	388	210	140	330	665	580	200

Detail of flange 00137158_0

① Compressible seal, to be provided by others
② Flange

Installation details, Basic information and nomenclature

Bend

A bend with a centre line curvature radius of at least 1D – without an additional straight duct section upstream of the VAV terminal unit – has only a negligible effect on the volume flow rate accuracy.

Installation and commissioning

Any installation orientation
Connecting spigots for warm and cold air arranged at an angle of 60° (TVM-S) or 90° (TVM)
Return edges of the casing with drilled holes suitable for threaded rods

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.

Definition of noise

① Air-regenerated noise
② Case-radiated noise

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)]

A-weighted sound pressure level of air-regenerated noise of the VAV terminal unit, system attenuation taken into account

L_PA1 [dB(A)]

A-weighted sound pressure level of air-regenerated noise of the VAV terminal unit with secondary silencer, system attenuation taken into account

L_PA2 [dB(A)]

A-weighted sound pressure level of case-regenerated noise of the VAV terminal unit, system attenuation taken into account

L_PA3 [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

V_nom [m³/h] and [l/s]

Nominal volume flow rate (100 %)

The value depends on product type and nominal size
Values are published on the internet and in technical leaflets, and stored in the Easy Product Finder design software.
Reference value for calculating percentages (e.g. V_max)
Upper limit of the setting range and maximum volume flow rate setpoint value for the VAV terminal unit

V_{min unit} [m³/h] and [l/s]

Technically possible minimum volume flow rate

The value depends on product type, nominal size and control component (attachment)
Values are stored in the Easy Product Finder design software
Lower limit of the setting range and minimum volume flow rate setpoint value for the VAV terminal unit
Depending on the controller, setpoint values below V_{min unit} (if V_min equals zero) may result in unstable control or shut-off

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_max can only be smaller than or equal to V_nom
In case of analogue signalling to volume flow controllers (which are typically used), the set maximum value (V_max) is allocated to the setpoint signal maximum (10 V) (see characteristic)

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_min should be smaller than or equal to V_max
Do not set V_min smaller than V_{min unit}, otherwise the control may become unstable or the damper blade may close
V_min may equal zero
In case of analogue signalling to volume flow controllers (which are typically used), the set minimum value (V_min) is allocated to the setpoint signal minimum (0 or 2 V) (see characteristic)

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

The static minimum differential pressure is equal to the pressure loss of the VAV terminal unit when the damper blade is open, caused by flow resistance (sensor tubes, damper mechanism)
If the pressure on the VAV terminal unit is too low, the setpoint volume flow rate may not be achieved, not even when the damper blade is open
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 terminal units, and the measurement point or points for speed control must have been selected accordingly to achieve this

Construction

Galvanised sheet steel

Casing made of galvanised sheet steel
Parts in contact with the airflow as described for the product type
External parts, e.g. mounting brackets or covers, are usually made of galvanised sheet steel

Powder-coated surface (P1)

Casing made of galvanised sheet steel, powder-coated RAL 7001, silver grey
Parts in contact with the airflow are powder-coated or made of plastic
Due to production, some parts that come into contact with the airflow may be stainless steel or aluminium, powder-coated
External parts, e.g. mounting brackets or covers, are usually made of galvanised sheet steel

Stainless steel (A2)

Casing made of stainless steel 1.4201
Parts in contact with the airflow are powder-coated or made of stainless steel
External parts, e.g. mounting brackets or covers, are usually made of galvanised sheet steel

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