Trox Technik TVRK User manual

VAV terminal unit
TVRK
Assembly and operating instructions
Read the instructions prior to performing any task!
VARYCONTROL
GB/en

CD10014, 2, GB/en
© TROX GmbH 2023
TROX GmbH
Heinrich-Trox-Platz
47504 Neukirchen-Vluyn
Germany
Telephone: [phone]
Fax: [phone]
E-mail: [email protected]
Internet: www.troxtechnik.com
01/2024
VAV terminal unit TVRK2

General information
Information about installation and commissioning
instructions
This installation and commissioning manual enables
operating or service personnel to use the variable air
terminal unit (hereinafter also referred to as VAV ter-
minal unit or unit) safely and efficiently.
The manual must be kept near the unit to be available
for use at all times.
The personnel performing work on the device must read
and understand this manual carefully before starting
any work. The basic prerequisite for safe working is to
comply with the safety notes and all instructions in this
manual.
The local regulations for health and safety at work and
the general safety regulations for the area of application
of the ventilation unit also apply.
Illustrations in this manual are mainly for information
and may differ from the actual design.
Other applicable documentation
In addition to these instructions, the following docu-
ments must be observed:
Product data sheets
Instructions for the electrical control components
(assemblies)
Project-specific wiring documents, if any
TROX Technical Support
To ensure that your request is processed as quickly as
possible, please have the following information ready:
Product designation
TROX order number
Delivery date
Issue or fault log
Ä Chapter 8.1 ‘Troubleshooting’
on page 23
Online www.troxtechnik.com
Phone [phone]
Safety notes
Symbols are used in this manual to alert readers to
areas of potential hazard. Signal words express the
degree of the hazard.
Comply with all safety instructions and proceed carefully
to avoid accidents, injuries and damage to property.
DANGER!
Imminently hazardous situation which, if not avoided,
will result in death or serious injury.
WARNING!
Potentially hazardous situation which, if not avoided,
may result in death or serious injury.
CAUTION!
Potentially hazardous situation which, if not avoided,
may result in minor or moderate injury.
NOTICE!
Potentially hazardous situation which, if not avoided,
may result in property damage.
ENVIRONMENT!
Environmental pollution hazard.
Tips and recommendations
Useful tips and recommendations as well as informa-
tion for efficient and fault-free operation.
General information
VAV terminal unit TVRK 3

Safety notes as part of instructions
Safety notes may refer to individual instructions. In
this case, safety notes will be included in the instruc-
tions and hence facilitate following the instructions. The
above listed signal words will be used.
Example:
1. Loosen the screw.
2.
CAUTION!
Danger of finger entrapment when closing
the lid.
Be careful when closing the lid.
3. Tighten the screw.
Specific safety notes
The following symbols are used in safety notes to alert
you to specific hazards:
Warning signs Type of danger
Warning – hand injuries.
Warning – high-voltage.
Warning – danger zone.
General information
VAV terminal unit TVRK4

1 Safety ................................................................ 6
1.1 Correct use ................................................ 6
1.2 Safety signs ............................................... 6
1.3 Dangers when handling the unit ................ 6
1.3.1 Electric shock hazards ........................... 7
1.4 System owner's responsibility ................... 7
1.5 Qualified staff ............................................. 8
1.6 Personal protective equipment .................. 8
1.7 Repair and replacement parts ................... 8
1.8 General safety measures .......................... 8
2 Transport, storage and packaging ................. 9
2.1 Delivery check ........................................... 9
2.2 Transport on site ........................................ 9
2.3 Storage ...................................................... 9
2.4 Packaging .................................................. 9
3 Product description ....................................... 10
3.1 Product overview ..................................... 10
3.2 Functional description ............................. 10
3.3 Display of the damper blade position ....... 11
3.4 Labelling on unit ....................................... 11
3.4.1 Rating plate ........................................... 11
3.4.2 Adjustment sticker ................................ 12
3.4.3 CE marking / declaration of incorpora-
tion ........................................................ 12
4 Installation ...................................................... 13
4.1 Safety ...................................................... 13
4.2 General installation information ............... 13
4.2.1 Installation of sound attenuators, fire
dampers and heat exchangers ............. 13
4.2.2 Installation orientation .......................... 14
4.2.3 Airflow direction .................................... 14
4.2.4 Upstream conditions ............................. 15
4.3 Fixing/suspension .................................... 16
4.4 Installation of the circular silencer ........... 16
4.5 Connecting the air duct ........................... 16
5 Electrical connection .................................... 18
5.1 Safety notes ............................................ 18
5.2 Installation instructions ............................ 18
6 Commissioning and operation ..................... 19
6.1 Factory preparation ................................. 19
6.2 Requirement for commissioning .............. 19
6.3 Commissioning ........................................ 19
6.3.1 Installation and connection ................... 19
6.3.2 Parameterisation by others and settings
............................................................... 19
6.3.3 Control components for duct pressure
control ................................................... 19
6.3.4 Control components for room pressure
control ................................................... 20
6.3.5 Functional test ...................................... 20
6.4 Operation ................................................. 20
6.5 Volume flow rate measurement ............... 20
6.5.1 Volume flow rate calculation ................. 21
6.5.2 C values ............................................... 21
7 Maintenance ................................................... 22
7.1 System owner's responsibility ................. 22
7.2 Maintenance ............................................ 22
7.3 Inspection measures ............................... 22
7.4 Repair ...................................................... 22
7.5 Maintenance service ............................... 22
8 Faults .............................................................. 23
8.1 Troubleshooting ....................................... 23
9 Decommissioning .......................................... 26
9.1 Safety ...................................................... 26
9.2 Disassembly ............................................ 26
9.3 Disposal ................................................... 26
10 Technical data ................................................ 27
10.1 General data .......................................... 27
10.2 Control component/attachments ........... 27
11 Index................................................................ 30
Table of contents
VAV terminal unit TVRK 5

1 Safety
1.1 Correct use
The VAV terminal unit from the TVRK type is used for
variable volume flow rate control, throttling or shut-off in
ventilation systems within closed rooms.
If the air is contaminated with dust, fluff, moisture or
sticky particles, only VAV terminal units that use a con-
trol component with a static differential pressure trans-
ducer may be used.
The VAV terminal unit type TVRK is used in particular
in ventilation systems with chemical contamination (e.g.
extract air from fume cupboards). For this application,
only control components with static differential pressure
transducers may be used. We recommend control com-
ponents with static differential pressure transducer and
room air induction.
The VAV terminal unit may only be used in kitchen
extract air systems if it is ensured that the extract air
is cleaned by highly effective aerosol separators (>90
%); observe VDI 2052.
In addition, shortened inspection and cleaning intervals
must be included in the maintenance plan.
Incorrect use
WARNING!
Danger of injury or risk of damage to property
due to unauthorised use!
Incorrect use of the VAV terminal unit can lead to
dangerous situations.
Do not use the VAV terminal unit:
– in areas with potentially explosive atmospheres
(EX)
– in aircraft
– outdoors without sufficient protection against the
effects of weather
– in wet areas
– for areas of application that are not described in
the product brochure
Modifying the unit or using replacement parts that have
not been approved by TROX is not permitted.
1.2 Safety signs
The following symbols and signs are usually found in
the work area. They apply to the very location where
they are found.
WARNING!
Danger due to illegible signage!
Over time, stickers and signs may fade or become
otherwise illegible, meaning that hazards cannot
be identified and necessary operating instructions
cannot be followed. There is then a risk of injury.
– Ensure that all of the safety, warning and oper-
ating information is clearly legible.
– Replace illegible signs or stickers immediately.
Electrical voltage
Only skilled qualified electricians are allowed to work in
areas marked as having electrical voltage.
Unauthorised people must not enter areas, open cabi-
nets or work on components where an electrical voltage
is present and which are hence marked with this
symbol.
1.3 Dangers when handling the unit
The unit is a state-of-the-art product and meets current
safety requirements. Residual risks cannot be excluded,
however, and you should proceed with caution. This
section describes the residual risks that have been iden-
tified in a risk assessment.
Always follow the safety notes in this manual to reduce
health hazards and prevent any hazardous situations.
Safety
Dangers when handling the unit
VAV terminal unit TVRK6

1.3.1 Electric shock hazards
Electric current
DANGER!
Danger of death due to electric current!
Contact with live parts poses an immediate danger
to life due to electric shock. Damaged insulation or
damaged parts are a life threatening hazard.
– Work on the electrical system must only be car-
ried out by skilled qualified electricians.
– If the insulation is damaged, disconnect the
power supply immediately and have the insula-
tion repaired.
– Before you start working on electric systems and
equipment, switch off the supply voltage and
secure it against being switched on accidentally.
Comply with the following safety rules:
– Switch off the supply voltage.
– Secure it against being switched on acciden-
tally.
– Ensure that no voltage is present.
– Connect to the earth; short circuit connection.
– Do not bypass or disable any circuit breakers. Be
sure to maintain the correct current rating when
you replace a circuit breaker.
– Ensure that live parts do not come into contact
with moisture. Moisture can cause a short circuit.
1.4 System owner's responsibility
System owner
The system owner is a natural or legal person who for
commercial or business purposes owns or manages the
ventilation system or component or allows third parties
to use or operate it, but continues to bear legal respon-
sibility for the safety of users, staff or third parties while
the product is in use.
System owner's obligations
The unit is intended for commercial use. The system
owner is therefore subject to the legal obligations of
occupational health and safety regulations.
In addition to the safety notes in this manual, the appli-
cable regulations for safety, accident prevention and
environmental protection must also be complied with.
In particular:
The system owner must be aware of the applicable
occupational health and safety regulations and carry
out a risk assessment to determine any additional
hazards that may exist or result from the specific
working conditions at the installation location. The
system owner has to create operating instructions
for the unit that reflect the results of this risk assess-
ment.
The system owner has to ensure, throughout the
entire operating period of the unit, that these oper-
ating instructions conform to applicable standards
and guidelines; in case of any deviation, the system
owner has to adapt the instructions.
The system owner must secure the unit to prevent
access by unauthorised individuals.
The system owner must clearly define the responsi-
bilities for operation, maintenance, cleaning, trouble-
shooting and removal.
The system owner has to ensure that all individuals
who handle or use the unit have read and under-
stood this manual.
The system owner must provide the employees with
the required personal protective equipment.
The system owner must comply with the local fire
regulations.
Hygiene requirements
The system owner has to comply with the local regu-
lations and harmonised standards for hygiene require-
ments. These include, among other things, compliance
with the corresponding maintenance and test intervals.
Safety
System owner's responsibility
VAV terminal unit TVRK 7

1.5 Qualified staff
WARNING!
Danger of injury due to insufficiently qualified
individuals!
Incorrect use may cause considerable injury or
damage to property.
– Only specialist personnel must carry out work.
The following degrees of qualification are required for
the work described in the operating manual:
HVAC technician
HVAC technicians are individuals who have sufficient
professional or technical training in the field they are
working in to enable them to carry out their assigned
duties at the level of responsibility allocated to them
and in compliance with the relevant guidelines, safety
regulations and instructions. HVAC technicians are indi-
viduals who have in-depth knowledge and skills related
to HVAC systems; they are also responsible for the pro-
fessional completion of the work under consideration.
HVAC technicians are individuals who have sufficient
professional or technical training, knowledge and actual
experience to enable them to work on HVAC systems,
understand any potential hazards related to the work
under consideration, and recognise and avoid any risks
involved.
Skilled qualified electrician
Skilled qualified electricians are individuals who have
sufficient professional or technical training, knowledge
and actual experience to enable them to work on elec-
trical systems, understand any potential hazards related
to the work under consideration, and recognise and
avoid any risks involved.
1.6 Personal protective equipment
Personal protective equipment is equipment that pro-
tects the user against health or safety risks at work.
Personal protective equipment must be worn for var-
ious types of work; the protective equipment required
is listed in this manual together with the description of
each type of work.
Description of personal protective equipment
Industrial safety helmet
Industrial safety helmets protect the head from falling
objects, suspended loads, and the effects of striking the
head against stationary objects.
Protective gloves
Protective gloves protect hands from friction, abrasions,
punctures, deep cuts, and direct contact with hot sur-
faces.
Safety shoes
Safety shoes protect the feet from crushing, falling parts
and prevent slipping on a slippery floor.
1.7 Repair and replacement parts
The devices must be repaired by qualified personnel
using genuine replacement parts only. This particularly
applies to work on the electrical equipment. For safety
reasons, defective devices should therefore be repaired
by the TROX Technical Service, Ä ‘TROX Technical
Support’ on page 3 .
1.8 General safety measures
Large temperature differences
Be careful when there is a large temperature difference.
If the unit has been kept in an unheated area, wait two
hours before switching on the supply voltage. Conden-
sation may damage the electronic components beyond
repair. Only after about 2 hours will the system have
reached room temperature.
Foreign matter and liquids
Be careful when objects or liquids have got into the
casing, or if the unit emits a smell or smoke. Decommis-
sion the unit and have it checked by the manufacturer.
Safety
General safety measures
VAV terminal unit TVRK8

2 Transport, storage and
packaging
Safety notes on handling the unit
CAUTION!
Danger of injury from sharp edges and sheet
metal parts.
– Always wear protective gloves when handling the
unit.
NOTICE!
Risk of damage to the unit!
– Handle the unit with care.
– Do not lift the unit by its control components, the
damper blade or differential pressure sensor.
– Lift the unit only by lifting the entire casing.
2.1 Delivery check
Check delivered items immediately after arrival for
transport damage and completeness. In the case of
any damage or an incomplete shipment, contact the
shipping company and your supplier immediately.
2.2 Transport on site
If possible, take the product in its transport pack-
aging up to the installation location.
Do not remove the protective wrapping until just
before installation.
2.3 Storage
If the product has to be stored temporarily:
Moisture and lack of ventilation can lead to oxida-
tion, even on galvanised components.
Remove any plastic wrapping in order to avoid oxi-
dation.
Protect the product from dust and contamination.
Store the product in a dry place and away from
direct sunlight.
Do not store the product below -10 °C or above +50
°C.
2.4 Packaging
Properly dispose of packaging material.
Transport, storage and packaging
Packaging
VAV terminal unit TVRK 9

3 Product description
3.1 Product overview
Fig. 1: TVRK product overview
1 Sensor tubes
2 Pull-out sensor head section (with sensor tubes)
3 Hoses between sensor tubes and control compo-
nent
4 Actuator
5 Casing
6 Damper blade
7 Electronic control component
Note: When installing the regulating device, ensure that
the hoses are routed without kinks!
3.2 Functional description
To measure the volume flow rate, the differential pres-
sure is measured at the sensor tubes of the VAV
terminal unit TVRK. The differential pressure is then
passed on to the control component via hoses. The
control component consists of a differential pressure
transducer that converts the pressure into an electrical
signal, an electronic control circuit and an actuator to
control the damper blade. With the Compact attach-
ments, all components are integrated together in one
housing. In the case of the Universal or LABCONTROL
attachments, the actuator is a separate component.
In most applications, the setpoint value for a air terminal
unit comes from a ambient temperature or air quality
controller. The controller compares the actual value with
the setpoint value and alters the control signal of the
actuator if there is a difference between the two values.
Notes for regulating devices for duct pressure con-
trol
In order to regulate the duct pressure, VAV terminal
units require a suitable control component, a suitable
pressure tapping point in the duct system and a stable
reference measuring point.
In most applications, the set point value for a differen-
tial pressure controller is stored as a fixed value in the
pressure control component.
In the case of duct pressure control, the control com-
ponent must not be connected to the differential pres-
sure sensors of the VAV terminal unit but to the duct
pressure tapping point and a reference measuring
point.
The accessibility of the connections for the differential
pressure sensors on the regulating device may there-
fore be restricted for differential duct pressure control-
lers depending on the design of the regulating device
and the control component.
For duct pressure detection, a so-called pressure tap-
ping set with pressure tap and hose is supplied, with
which the control component for pressure detection is
connected to the air duct.
The atmospheric pressure at the control component
is generally used as the reference measuring point,
provided that it is stable and is not in a pressure-con-
trolled range.
Product description
Functional description
VAV terminal unit TVRK10

Notes on regulating devices for room pressure
control
To regulate the room pressure, VAV terminal units
require a suitable control component, a pressure tap-
ping point in the room and a stable reference meas-
uring point.
In most applications, the set point value for a differen-
tial pressure controller is stored as a fixed value in the
pressure control component.
In the case of room pressure control, the control com-
ponent is not to be connected to the differential pres-
sure sensors of the VAV terminal unit but to the room
pressure tapping point and the reference measuring
point.
The accessibility of the connections for the differential
pressure sensors on the regulating device may there-
fore be restricted for differential room pressure control-
lers depending on the design of the regulating device
and the control component.
The pressurised rooms must be sufficiently tight to
build up the required pressure. In addition, the rooms
must allow overflow so that the control components
can regulate the pressure (at least 10% of the total
extract air in the room as overflow).
A reference measuring point is a room with constant
atmospheric pressure against which the room pressure
to be controlled is measured.
The reference measuring point should take the fol-
lowing aspects into account:
No room that is surrounded by ventilated rooms
or is ventilated itself
No corridor with elevator
No elevator shaft
No wind load on the reference measuring point
3.3 Display of the damper blade posi-
tion
The damper blade position corresponds to the mark on
the shaft and is thus recognisable from the outside.
Clamping device (frictional connection)
Fig. 2: Display with clamping device
1 Shaft with marking for position indication
2 Damper blade
3.4 Labelling on unit
3.4.1 Rating plate
Fig. 3: Type plate (example)
1 Note on observing the operating instructions
2 Order data commission number – item number; if
necessary, serial number if there are several pieces
in the item
3 Order code
4 Order code detail of the control component
5 Information on devices that deviate from the
standard
6 QR code containing the customer text (11) below in
machine-readable form
7 Barcode with the serial number (for manufacturing
processes at TROX)
8 Manufacturer's address
9 Product and type
10 Arrow indicating the airflow direction
Ä Chapter
4.2 ‘General installation information’ on page 13
11 Customer text for installation/use (tagging text from
the order)
12 QR code with link in myTrox to individual product
documentation matching the serial number
13 Serial number of the complete product, including the
installed attachment
Product description
Labelling on unit > Rating plate
VAV terminal unit TVRK 11

3.4.2 Adjustment sticker
The adjustment sticker documents the factory setting
and the test steps stored for these variants.
Type and variant information only includes the order
code details required for this process.
Fig. 4: Adjustment sticker example for TVE type with
control components XM0 and XS0
1 Commission number. Item number
2 Type designation of VAV terminal unit
3 nominal size
4 Control component
5 Operating mode
M ð Modbus
F ð constant value
V ð variable
0 or 2 ð characteristic type
6 Characteristics 0 – 10 V or 2 – 10 V
7 Volume flow rate ranges qvmin – qvmax or constant
value
8 Nominal volume flow rate qvnom
9 Hardware type designation
10 Control component:
OF ð equipped at the factory
SP ð replacement part
11 Serial number
12 Test ID number
3.4.3 CE marking / declaration of incorpo-
ration
The TVRK unit complies with the Machinery Directive
2006/42/EC as partly completed machinery, as it does
not fulfil an independent function on its own. A CE mark
and a Declaration of Conformity are therefore not per-
mitted in accordance with the Machinery Directive.
In accordance with the Machinery Directive, partly com-
pleted machinery obtains a Declaration of Incorporation.
This Declaration of Incorporation confirms that the basic
safety aspects of the Machinery Directive and any other
directives are observed.
The Declaration of Incorporation can be accessed via
the QR code on the rating plate. You can download the
document on the Internet at www.troxtechnik.com .
Product description
Labelling on unit > CE marking / declaration of incorporation
VAV terminal unit TVRK12

4 Installation
4.1 Safety
Personnel:
HVAC technician
Protective equipment:
Protective gloves
Safety shoes
Industrial safety helmet
Only specialist personnel are allowed to perform the
described work on the VAV terminal unit.
Only skilled qualified electricians are allowed to work on
the electrical system.
CAUTION!
Danger of injury from sharp edges and sheet
metal parts.
– Always wear protective gloves when handling the
unit.
NOTICE!
Risk of damage to the unit!
– Handle the unit with care.
– Do not lift the unit by its control components, the
damper blade or differential pressure sensor.
– Lift the unit only by lifting the entire casing.
4.2 General installation information
ATTENTION: Pay attention to the arrow indi-
cating the correct airflow direction on the unit!
Ä 3.4 ‘Labelling on unit’ on page 11
Select the installation location such that the VAV ter-
minal unit, inspection accesses and the control com-
ponents remain accessible for the following work:
– Wiring
– Adjustment work (service socket if necessary)
– Servicing and maintenance, e.g. to replace con-
trol components, if necessary in several parts
(controllers, transducers, actuators).
– Cleaning removable sensor tubes
For information on space requirements, see product
data sheets.
Do not swap supply and extract air units.
Do not swap over units that belong together in
command and tracking controls (e.g. supply air and
extract air).
Installation in kitchen extract air systems may only
take place downstream of aerosol separators (>90
%); observe VDI 2052.
4.2.1 Installation of sound attenuators, fire
dampers and heat exchangers
If additional components are arranged upstream of a
regulating device in the airflow direction, the clearances
specified in the table must be observed. Shorter dis-
tances lead to measurement inaccuracies on the ter-
minal unit. The components can be arranged directly
behind the terminal unit.
Distances to other components
Component Clearance in airflow
direction
in front of TVRK
Plastic circular silencer
without core CAK
No clearance
Fire damper At least 3D
Heat exchanger Behind terminal unit only
Installation
General installation information > Installation of sound attenuators, fire damper...
VAV terminal unit TVRK 13

4.2.2 Installation orientation
For terminal units with diaphragm pressure transducers,
the installation orientation of the control component
(TROX Universal or EASYLAB controller) must be taken
into account. The actual installation orientation must be
compared with the variants on the sticker. If necessary,
the position of the membrane pressure transducer must
be adjusted, ( Fig. 5 ).
Fig. 5: Sticker showing installation orientations
The installation orientation of the control component
matches the factory installation position of the dia-
phragm pressure transducer
For the installation orientation of the control compo-
nent, the position of the membrane pressure trans-
ducer must be adjusted according to the figure.
4.2.3 Airflow direction
It is imperative that air terminal units are installed
in their intended airflow direction. An arrow indicating
the correct airflow Ä Chapter 3.4.1 ‘Rating plate’
on page 11 is attached to the VAV terminal unit for this
purpose.
Installation
General installation information > Airflow direction
VAV terminal unit TVRK14

4.2.4 Upstream conditions
The volume flow rate accuracy of the unit 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. The upstream conditions
explained below must be adhered to in order to achieve the specified volume flow rate accuracy.
Bend Junction from a main duct
A bend with a curvature radius of at least 1D – without
an additional straight duct section upstream of the unit –
has only a negligible effect on the volume flow rate accu-
racy Δqᵥ.
A junction from main duct causes strong turbulence.
The stated volume flow rate accuracy Δqᵥ can only be
achieved with a straight duct section of at least 5D
upstream.
4.2.4.1 Inflow via an open duct (extract air mode)
When flow enters the open end of a duct, the following
conditions must be observed with regard to the posi-
tioning of the air terminal units in order to obtain a lam-
inar flow and thus sufficient measuring accuracy.
Inflow via an open duct
Fig. 6: Upstream conditions at open duct end
The inflow at the open end of a duct causes strong
turbulence.
The stated volume flow rate accuracy can only be ach-
ieved with the following upstream straight duct sections:
At least 5D
Inflow via inflow aid
Alternatively, an inflow aid must be installed at the open
duct end upstream of the VAV terminal unit:
Fig. 7: Upstream conditions with inflow aid
The stated volume flow rate accuracy is achieved when
an inflow aid is connected directly to the VAV terminal
unit.
Fig. 8: Dimensions of inflow aid [mm]
Installation
General installation information > Upstream conditions
VAV terminal unit TVRK 15

4.3 Fixing/suspension
General installation information
When designing and constructing ventilation and air
conditioning systems, take into account the require-
ments of VDI 6022, in particular:
– Hygienic, clean installation of all components
and their air distribution surfaces.
– Planning inspection/cleaning openings in the
ducting system.
– Avoidance of leaks.
Affix the unit proficiently and only to load-bearing
components.
Load suspension systems only with the weight of
the unit. Adjacent components and connecting ducts
must be supported separately.
Only use approved and sufficiently dimensioned
suspensions for fixing. Secure screw connections
against self-loosening, e.g., by locking them. Fixing
material is not included in the supply package.
For fixing, only use drilling screws that are as short
as possible; these must not be screwed into the
movement and sealing area of the damper blade or
the differential pressure sensor.
Fig. 9: Installation example using a VAV terminal unit
TVR-*
1 VAV terminal unit, round, e.g. TVR
2 Air direction arrow e.g., on the scale sticker
3 Drilling screw for fixing to the ducting
4 Pipe clamp
5 Suspension, e.g., with threaded rod
Fig. 10: Examples of fixings for circular units
1 Fixing to pipe clamps
2 Fixing to suspension element
4.4 Installation of the circular silencer
Circular silencers are supplied separately and must be
installed at the installation location between the VAV
terminal unit and the room. Detach the sound attenuator
separately, Ä Installation manual for circular silencers.
4.5 Connecting the air duct
When connecting the ducting, the customer must
ensure that the connection points are installed as air-
tight as possible in order to avoid negative influences
from leakages such as air volume deviations, power
consumption, etc. Unless otherwise stated, the con-
necting material is not included in the supply package.
In the case of one-sided connection of the ductwork,
intervention in the damper blade is to be prevented by
suitable measures (for example, grilles).
Before connecting the ducting:
Check the inside of the unit for damage and loose
parts.
Remove any contamination from the ducting.
Fig. 11: Plastic flanges
Matching flanges, including seal available as acces-
sories
Screw connection M8 (to be provided by others)
Installation
Connecting the air duct
VAV terminal unit TVRK16

Dimensions and number of holes in accordance with
EN 12220.
Position the ducting exactly. Do not pull the dis-
tances together via the flange connection.
Fig. 12: Plastic spigot
Installation on ducting in accordance with DIN 8077
– with clamp connectors
– by plastic welding
Installation
Connecting the air duct
VAV terminal unit TVRK 17

5 Electrical connection
5.1 Safety notes
DANGER!
Danger of electric shock! Do not touch any live com-
ponents. Electrical equipment carries a dangerous
electrical voltage.
– Only skilled qualified electricians are allowed to
work on the electrical system.
– Before working on the electrical system, switch
off the supply voltage and secure it against being
switched on again.
5.2 Installation instructions
The VAV terminal unit was manufactured and configured
on a project-specific basis. The control components are
prewired at the factory. For units with electrical control
components, the supply voltage must be connected,
and, if necessary, also signal or bus lines must be con-
nected.
The connection is made according to the information on
the control components or connection diagrams in the
product data sheet or commissioning instructions for the
respective control component, www.troxtechnik.com .
The voltage ranges and terminal connections specified
on the control components must be observed!
Personnel:
Skilled qualified electrician
Observe the following during installation:
Legal and official regulations, in particular VDE
guidelines.
Observe the technical connection rules (TCR) of the
local grid operator.
Wiring work for supply voltage and signal lines on
site.
The rating and manufacturing of customer-side con-
nections and wiring must be carried out in accord-
ance with the recognised rules of electrical engi-
neering.
The responsibility for design, dimensioning and
sizing of the electrical and network installations
as well as their execution by others lies with the
specialist consultant, HVAC contractor and commis-
sioning engineer appointed by the system owner.
This includes, in particular, the dimensioning of the
power supplies as well as cable types and cross
sections.
For network installations, the specification of the
respective network variant must be observed. For
information, see here:
– BACnet MS/TP or BACnet/IP ð BACnet.org
– Modbus RTU or Modbus TCP ð Modbus.org
– KNX bus ð KNX.org
– MP-Bus technology - project planning informa-
tion ð www.belimo.com
Observe wiring guidelines and project-specific circuit
diagrams.
The electrical connection may only be made after
complete installation of the unit.
For units with a 24 V supply voltage, observe the
following:
– Electrical connection only with safety trans-
former
– Make sure that all connected units have the
same GND reference point for the supply
voltage.
Suitable wire clamping brackets must be provided
for all connecting cables.
Electronic components contain no parts that can be
replaced or repaired by the user and may only be
opened by the manufacturer!
Electrical connection
Installation instructions
VAV terminal unit TVRK18

6 Commissioning and opera-
tion
6.1 Factory preparation
TROX VAV terminal units are prepared, calibrated and
tested at the factory. The commissioned operating
parameters are set and the volume flow controller is
tested with regard to air distribution technology.
The following exceptions apply:
For special versions, parameterisation by others
may be necessary.
The factory adjustment is documented on the silver
adjustment sticker,
Ä Chapter 3.4.2 ‘Adjustment
sticker’ on page 12 .
6.2 Requirement for commissioning
Contamination, e.g. dust, can adversely affect the func-
tionality of the VAV terminal unit.
Therefore, the ventilation and air conditioning system
and its components may not be put into operation for
the first time until the rooms connected to the ventila-
tion system have been cleaned of any contamination
resulting from construction work. Contamination of the
ventilation system by construction dust and sucked-in
dirt particles must be eliminated. In the case of systems
that are heavily contaminated due to construction activ-
ities, the system may need to be cleaned before com-
missioning.
6.3 Commissioning
Code of good practice for commissioning
Commissioning is governed by the standard "DIN
EN 12599 Testing and measuring procedures for the
transfer of installed ventilation and air conditioning
systems", and, if applicable, contractually agreed
services between HVAC contractors, system owners
and installation engineers. The standard describes
the essential commissioning steps of the complete-
ness check, function check, function measurement
as well as report generation and handover.
6.3.1 Installation and connection
Once the electrical or pneumatic connections have been
correctly installed and made, the VAV terminal unit is
ready for operation.
6.3.2 Parameterisation by others and set-
tings
Subsequent adjustment of settings
Subsequent adjustments to the volume flow rate oper-
ating range may require manufacturer-specific adjust-
ment devices or PC software, depending on the control
component.
Network integration
Bus-compatible control components may require inte-
gration into the building's network infrastructure to be
performed by others (network commissioning, e.g. set-
ting the subscriber address and communication param-
eters). Manufacturer-specific tools such as adjustment
devices or software packages and associated interface
adapters may be required for this.
Special constructions
VAV terminal units without standardised control compo-
nents (e.g. special versions) may require parameterisa-
tion or network integration to be performed by others.
Manufacturer-specific tools such as adjustment devices
or software packages and associated interface adapters
may be required for this.
6.3.3 Control components for duct pres-
sure control
with integrated differential pressure transducer:
– Prepare the duct pressure sampling point (duct
pressure sampling set) and establish the tubing
to the control component.
with separate differential pressure transducer (only
with TROX UNIVERSAL or EASYLAB):
– Install differential pressure transducer for duct
pressure measurement. Prepare duct pressure
sampling point (duct pressure sampling set)
and establish tubing to the differential pressure
transducer.
– Connect the duct pressure actual value signal of
the differential pressure transducer to the control
component.
– During commissioning, carry out the character-
istic setting in order to inform the pressure con-
trol circuit of the characteristics of the external
transducer, e.g. nominal pressure/working range
and signal characteristics. The EasyConnect
software is required for setting.
Commissioning and operation
Commissioning > Control components for duct pressure control
VAV terminal unit TVRK 19

6.3.4 Control components for room pres-
sure control
with integrated differential pressure transducer:
– Carefully select the measuring point for room
pressure and connect the tubing to the control
component.
with separate differential pressure transducer (only
with TROX UNIVERSAL or EASYLAB):
– Install differential pressure transducer for room
pressure measurement. Carefully select the
measuring point for room pressure and connect
the tubing to the differential pressure transducer.
– Connect the room pressure actual value signal
of the differential pressure transducer to the
control component.
– During commissioning, carry out the character-
istic setting in order to inform the pressure con-
trol circuit of the characteristics of the external
transducer, e.g. nominal pressure/working range
and signal characteristics. The EasyConnect
software is required for setting.
6.3.5 Functional test
Prerequisites for the functional test
VAV terminal unit has been correctly installed in the
ducting system:
– Airflow direction, according to airflow direc-
tion arrows
Ä Chapter 3.4.1 ‘Rating plate’
on page 11
– Upstream conditions correct, Ä Chapter
4.2 ‘General installation information’
on page 13
– Correct installation orientation,
Ä Chapter
4.2 ‘General installation information’
on page 13
Electrical or pneumatic connections have been cor-
rectly installed and tested.
Ventilation and air conditioning system is in opera-
tion (fans running).
Air circulation is guaranteed (shut-off dampers and
fire dampers are open).
Supply voltage or the compressed air supply is
switched on.
Measuring hoses between differential pressure
sensor and control component or pressure trans-
ducer are undamaged and kink-free.
1. Check installation orientation and carry out zero
point correction, see instructions for the control
component.
Installation orientation and zero point
correction
Only required for control components with
static diaphragm pressure transducer. Control
components with static diaphragm pressure
transducers can be identified by the installation
orientation sticker,
Ä Chapter 4.2.2 ‘Installa-
tion orientation’ on page 14 .
2. Compare volume flow rate actual value signal with
setpoint value signal. The setpoint value signal
can be variable or constant, depending on the
intended application.
3. Check damper blade positions:
Damper blade in control position
Door open
Door closed
4. Check override control functions
5. Further function tests on the VAV terminal unit can
only be carried out if it is known which control
component has been fitted.
Information on this can be found in the documen-
tation of the TROX control components or in
the product information of the control component
manufacturer.
6.4 Operation
Once commissioning has been completed, the VAV ter-
minal unit will operate in a self-powered manner and
require no intervention from the system owner.
Depending on the area of application of the VAV ter-
minal unit, test specifications and intervals may have
to be observed; for example, when used on fume cup-
boards, an annual functional test must be carried out
and documented.
In case of a malfunction, decommission the VAV ter-
minal unit and have it repaired before commissioning it
again.
6.5 Volume flow rate measurement
For testing the volume flow rate or differential pressure-
transducer, the differential pressure ∆pw (differential
pressure) can be measured directly at the differential
pressure sensor of the VAV terminal unit by means of a
pressure gauge.
Attention: During the measurement, the actuator of the
control component must be switched off, e.g. via a spe-
cial function of a service tool or by switching off the
supply voltage. Otherwise, a comparison measurement
will be influenced by changing blade positions from the
control process.
Commissioning and operation
Volume flow rate measurement
VAV terminal unit TVRK20