TROX TVM mixed flow variable air volume terminal with circular spigots

TROX TVM inlet section with airflow measuring cross on mixed flow terminal

TROX TVM circular duct connection on mixed flow VAV terminal

TROX TVM mixed flow VAV terminal outlet section

VDI 6022 hygiene certification badge for TROX TVM

TROX TVM – VAV for Dual Duct Systems

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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 various applications
Closed blade air leakage to EN 1751, up to class 4
Casing leakage to EN 1751, Class B

Optional equipment and accessories

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

Type

Spigot arrangement

Acoustic cladding

Nominal size [in]

Accessories

Attachments (control component)

(control voltage for

Operating mode

Signal voltage range

Operating values for factory setting

SKU: TVM Category: Variable Air Volume Regulators (VAV) Tag: TVM

General Information

Application

VAV dual duct terminal unit for use in ventilation and air conditioning systems
Supply air control in dual-duct volume flow 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 (by others)

Special features

Integral effective pressure sensor with 0.1 in 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 according to VDI 6022

Nominal sizes

TVM-S: 5, 6, 8
TVM: 5, 6, 8, 10, 12, 16

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 effective pressure sensors for volume flow rate measurement, one in the cold air flow and in the total air flow respectively
Damper blade
Integral attenuator
Inspection access
Factory-mounted control components complete with wiring and tubing
Aerodynamic functional testing on a special test rig before shipping of each unit
Set-up data is given on a label affixed to the unit
High control accuracy (even with upstream bend R = 1D)

Attachments

Compact controller: Compact unit consisting of controller with potentiometers, effective pressure transducer and actuator

Accessories

Double 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 double lip seal
Connection on the room end suitable for ducts
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
Effective pressure sensor made of aluminium
Plastic plain bearings
Shaft and linkage made of galvanised steel

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
Non-hazardous to health thanks to being highly biosoluble in accordance with the Ordinance on Hazardous Substances and Note Q of the European Directive (EC) No. 1272/2008
Faced with glass fibre fabric as a protection against erosion from airflow velocities of up to 20 m/s
Inert to fungal and bacterial growth

Standards and guidelines

Fulfils the hygiene requirements of

EN 16798, Part 3
VDI 6022
DIN 1946, Part 4
Further standards, guidelines in accordance with hygiene certificate

Casing leakage

EN 1751, Class B

Closed blade leakage
Nominal sizes 5 and 6

EN 1751, Class 3
Fulfilment of the general requirements of DIN 1946, Part 4, with regard to the acceptable closed blade air leakage

Nominal sizes 8 to 16

EN 1751, Class 4
Fulfilment of the increased requirements of DIN 1946, Part 4, with regard to the acceptable closed blade air leakage

Maintenance

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

Function

The VAV terminal unit is fitted with two effective 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 effective pressure transducers that transform the effective pressure into an electric signal, two controllers, and two actuators; as 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 administers the cold air volume flow controller and indicates the setpoint value for the cold air flow rate between 0 and a maximum volume flow qᵥ_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/overall

controller is set to the minimum volume flow rate qᵥ_min and controls the damper blade in the heat duct. 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.

Schematic Illustration of the TVM-S

1 Damper blade for q_v,cold

2 Double lip seal

3 Effective pressure sensor for q_v,cold

4 Control components, e. g. a Compact controller

5 Inspection access

6 Effective pressure sensor for q_v,tot

7 Noise insulation

8 Damper blade for q_v,warm

Specification Text

Specification text

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 8, an angle of 60° is also possible and is therefore ideal 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 effective 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 sound attenuator. Factory-mounted control components complete with wiring and tubing. Effective pressure sensor with 0.1 in measuring holes, hence resistant to contamination. Spigot on the fan end with groove for double lip seal, suitable for ducts according to EN 1506 or EN 13180. Room end suitable for the connection of flanges. 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 can be seen from the outside at the shaft extension. Closed blade air leakage to EN 1751, class 4 (nominal sizes 5 and 6, class 3). Casing leakage according to EN 1751, class B. Meets the hygiene requirements of VDI 6022, EN 16798, Part 3, VDI 3803 as well as DIN 1946 Part 4.

Special features

Integral effective pressure sensor with 0.1 in 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 according 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
Aluminium sensor tubes
Plastic plain bearings
Shaft and casing made of galvanised steel

Mineral wool:

To EN 13501, fire rating class A1, non-combustible
RAL quality mark RAL-GZ 388
Non-hazardous to health thanks to being highly biosoluble in accordance with the Ordinance on Hazardous Substances and Note Q of the European Directive (EC) No. 1272/2008
Faced with glass fibre fabric as protection against erosion through airflow velocities of up to 3937 fpm
Inert to fungal and bacterial growth

Connection

Spigot with groove for double lip seal, suitable for ducts according to EN 1506 or EN 13180
Room end suitable for the connection of flanges

Technical data

Nominal sizes: 5 to 16 in
Volume flow rate range: 123.6 – 4468.9 cfm
Volume flow rate control range: approx. 30 – 100 % of the nominal volume flow rate
Minimum differential pressure: up to 0.81 in WG (without secondary silencer TS)
Maximum differential pressure: 4.02 in WG

Specification text for attachment
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, volt-free switches: CLOSE, OPEN, qᵥmin and qᵥmax
Volume flow rate control range: approx. 30 – 100 % of the nominal volume flow rate

Variants

Material

Standard construction

Order code detail	Part	Material
–	Casing	Galvanised sheet steel
	Effective pressure sensor (cold)	Aluminium tube
	Effective pressure sensor (total)	Aluminium
	Damper blade	Galvanised sheet steel
	Damper blade seal	Thermoplastic elastomer (TPE)
	Shaft and linkage	Galvanised steel
	Plain bearings	Thermoplastic elastomer (TPE)

With acoustic cladding (optional)

Order code detail	Part	Material
D	Lining	Mineral wool to EN 13501, fire rating class A1, non-combustible
	Acoustic cladding casing	Galvanised sheet steel
	Insulation of structure-borne noise	Polyethylene, PE

Option double lip seal

Order code detail	Part	Material
D2	Double lip seal	Rubber, EPDM

VAV Dual Duct Terminal Unit, Variant 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°

Product Details

Installation and commissioning

Horizontal (return edges of the casing with suspension holes at the top) and vertical installation orientation
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 Δqᵥ 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. The upstream conditions apply primarily to the duct connection at the cold air spigot. Since the hot air spigot does not contain a sensor, the upstream section here has no effect on the volume flow rate accuracy; however, unfavourable upstream sections can also lead to increased sound pressure levels.

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.