Trox Technik LVC Installation and operation manual

Control component
BC0-Compact
for VAV terminal units
Installation and commissioning instructions
Read the instructions prior to performing any task!
LVC • TVR • TVJ • TVT • TZ-/TA-Silenzio • TVZ • TVA • TVM
GB/en

A00000088377, 1, GB/en
© TROX GmbH 2019
TROX GmbH
Heinrich-Trox-Platz
47504 Neukirchen-Vluyn, Germany
Germany
Telephone: [phone]
Fax: [phone]
E-mail: [email protected]
Internet: www.trox.de
06/2021
Control component BC0-Compact for VAV terminal units
2

General information
Information about installation and commissioning
instructions
These installation and commissioning instructions
enable the safe and efficient handling of the BC0-Com-
pact type control components and the associated VAV
terminal unit. Also referred to as control component or
compact controller in the following document.
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.
In addition, the local health and safety regulations and
general safety regulations apply to the area of applica-
tion of the device.
Illustrations in this manual are mainly for information
and may differ from the actual unit design.
Other applicable documentation
In addition to these instructions, the following docu-
ments must be observed:
Installation and commissioning instructions of the
VAV terminal unit
Product data sheets
Project-specific wiring documents of the system
planner if any
TROX Technical Service
To ensure that your request is processed as quickly as
possible, please keep the following information ready:
Product name
TROX order number
Delivery date
Brief description of the fault
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
Control component BC0-Compact for VAV terminal units 3

Safety notes as part of instructions
Safety notes may refer to individual instructions. In this
case, safety notes will be included in the instructions
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 – high-voltage.
Warning – danger zone.
General information
Control component BC0-Compact for VAV terminal units4

1 Safety ................................................................ 6
1.1 Correct use ................................................ 6
1.2 Safety signs ............................................... 6
1.3 Residual risks ............................................ 6
1.3.1 Electric shock hazards ........................... 7
1.4 System owner's responsibility ................... 7
1.5 Staff ........................................................... 7
1.6 Personal protective equipment .................. 8
1.7 General safety measures .......................... 8
1.8 Repair and replacement parts ................... 8
2 Transport, storage and packaging ................. 9
2.1 Delivery check ........................................... 9
2.2 Transport on site ........................................ 9
2.3 Bearing ...................................................... 9
2.4 Packaging .................................................. 9
3 Structure and functional description ........... 10
3.1 Product overview ..................................... 10
3.2 Position of the damper blade ................... 11
3.3 Function description ................................. 11
3.4 Operating modes ..................................... 12
3.4.1 Operation with constant volume flow
rate setpoint value ................................ 12
3.4.2 Operation with variable volume flow rate
setpoint value ....................................... 13
3.4.3 Override control .................................... 13
3.4.4 Supply/extract air tracking control ........ 14
3.5 Characteristics ......................................... 15
4 Installation ...................................................... 17
5 Wiring ............................................................. 18
5.1 Installation instructions ............................ 18
5.2 Connection diagrams .............................. 18
6 Information on the MP bus ........................... 21
7 Commissioning and operation ..................... 22
7.1 Setting of the control component ............. 23
7.1.1 Control ranges of VAV terminal units .... 23
7.1.2 Factory settings .................................... 25
7.1.3 Setting constant volume flow control .... 25
7.1.4 Setting variable volume flow control ..... 25
7.2 Functional test ......................................... 26
7.2.1 with service tool .................................... 26
7.2.2 with voltmeter ....................................... 26
7.3 Switching the direction of rotation ........... 27
8 Troubleshooting ............................................ 28
8.1 Common mistakes ................................... 28
8.1.1 Volume flow rate deviation due to unfav-
ourable installation situation ................. 28
8.1.2 Incorrect wiring ..................................... 28
8.1.3 System pressure too low ...................... 28
8.1.4 Use outside the control area ................ 28
8.1.5 Deviation between setpoint value and
actual value signal ................................ 29
8.2 Systematic troubleshooting ..................... 29
8.3 Further diagnostic options ....................... 29
8.3.1 Use of voltmeters to control setpoint
values and feedback signals ................ 29
8.3.2 Sample calculations ............................. 29
8.3.3 Order of replacement control compo-
nents ..................................................... 30
9 Disposal .......................................................... 31
10 Technical data ................................................ 32
11 Declaration of conformity ............................. 34
12 Index................................................................ 35
Appendix......................................................... 37
A ZTH menu structure ................................... 38
B Systematic troubleshooting ........................ 39
Table of contents
Control component BC0-Compact for VAV terminal units 5

1 Safety
1.1 Correct use
The electronic control component type BC0-Compact is
used in combination with a TROX air terminal unit for
variable volume flow rate control in ventilation and air
conditioning systems.
The Compactregler is designed for use indoors to con-
trol clean indoor air.
Supply air area of application:
–The usual conditioning in ventilation and air con-
ditioning systems allows use in the supply air
without additional dust protection measures.
Extract air area of application:
– Extract air with a low content of dust or lint (e.g.,
office) allows use without additional dust protec-
tion measures.
– For dry extract air with a higher proportion of
dust or lint, a suitable filter must be used in front
of the VAV terminal unit.
– For extract air with a high content of dust, lint or
sticky components, or extract air with aggressive
operating fluids, use a TROX controller with a
static differential pressure transducer.
– Do not use VAV terminal units in extract air sys-
tems in commercial kitchens unless the extract
air has been cleaned as much as possible with
high-efficiency aerosol separators; see
VDI 2052.
In unspecified applications, or when combined with con-
taminated air (e.g., dust) and moisture, a TROX con-
troller with static differential pressure transducer should
be used.
Incorrect use
WARNING!
Danger of injury or risk of damage to property
due to incorrect use!
Misuse of the control component can lead to dan-
gerous situations.
Never use the control component/device:
–in explosion-proof areas
– in aircraft
– outdoors without sufficient protection against the
effects of weather
– in humid air (even temporarily, i.e., in wet areas,
such as bathrooms with showers)
– for areas of application that are not described in
this manual
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 Residual risks
The VAV terminal unit is state of the art and designed in
accordance with current safety requirements. Residual
risks cannot be excluded, however, and you should pro-
ceed with caution. This section describes the residual
risks that have been identified in a risk assessment.
Always follow the safety notes in this manual to reduce
health hazards and prevent any hazardous situations.
Safety
Residual risks
Control component BC0-Compact for VAV terminal units6

1.3.1 Electric shock hazards
Electric current
DANGER!
Danger of death due to electric current!
Danger of electric shock! Do not touch any live com-
ponents! Damaged insulation or damaged parts are
a life threatening hazard.
– Have work on the electrical system carried out
only by skilled qualified electricians.
–If the insulation is damaged, switch off the supply
voltage immediately and have the insulation
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 power supply.
– 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 observe the local fire regu-
lations.
Hygiene requirements
The system owner has to comply with the local regula-
tions and harmonised standards for hygiene require-
ments. These include, among other things, compliance
with the corresponding maintenance and test intervals.
1.5 Staff
Qualification
The work described in this manual has to be carried out
by individuals with the qualification, training, knowledge
and experience described below:
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 regu-
lations and instructions. HVAC technicians are individ-
uals who have in-depth knowledge and skills related to
HVAC systems; they are also responsible for the profes-
sional 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.
Safety
Staff
Control component BC0-Compact for VAV terminal units 7

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.
TROX Technical Service
Staff of TROX Technical Service or of service partner
companies approved and assigned by TROX GmbH.
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 various
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 General safety measures
NOTICE!
Risk of damage to property due to large tempera-
ture differences
If any electronic components have been kept in an
unheated area, condensation may form and damage
the electronic components beyond repair.
– Before you start commissioning, make sure that
all devices have warmed up to the ambient tem-
perature. Only after about 2 hours will the system
have reached ambient temperature.
Foreign matter and liquids
NOTICE!
Risk of damage to property due to foreign matter
and liquids!
Foreign matter and liquids that get into the unit may
damage the electronic parts.
–Do not use any liquids for cleaning.
– Remove foreign matter, if any.
– If the device emits a smell or smoke, have it
checked by the manufacturer.
– If liquid gets into the module, let the module com-
pletely dry before commissioning.
1.8 Repair and replacement parts
Only qualified personnel can repair the devices, and
only genuine replacement parts are allowed to be used.
This applies to work on the electrical equipment. There-
fore, for safety reasons, have defective devices repaired
by TROX Technical Service, Ä ‘TROX Technical
Service’ on page 3 .
Safety
Repair and replacement parts
Control component BC0-Compact for VAV terminal units8

2 Transport, storage and
packaging
Sharp edges and sheet metal parts
CAUTION!
Danger of injury from sharp edges and sheet
metal parts.
– Always wear protective gloves when handling the
unit.
Damage to the VAV terminal unit
NOTICE!
Risk of damage to the VAV terminal unit!
– Handle the unit with care.
–Do not lift the VAV terminal 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 case of any
damage or an incomplete shipment, contact the ship-
ping company and your supplier immediately.
The delivery is typically completed mounted on a VAV
terminal unit.
Check the following items on delivery:
Compactregler
– mounted on the VAV terminal unit and fixed with
anti-rotation lock
– Measuring hoses without kinks connected to the
VAV terminal unit
– Adjustment sticker on the VAV terminal unit
With replacement controllers:
– Check differential or effective pressure connec-
tions for blockage and cleanliness.
2.2 Transport on site
If possible, transport the VAV terminal unit to the
installation location in the shipping container.
Do not remove the protective wrapping until just
before installation.
2.3 Bearing
If the product must be stored:
Moisture and lack of ventilation can lead to oxida-
tion, even on galvanised components. Remove any
plastic wrapping in order to avoid oxidation.
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.
After storage and prior to installation, first allow the
unit to acclimatise to the installation temperatures
for at least 2 hours.
2.4 Packaging
Properly dispose of packaging material.
Transport, storage and packaging
Packaging
Control component BC0-Compact for VAV terminal units 9

3 Structure and functional description
3.1 Product overview
Fig. 1: BC0 Compact controller mounted on the terminal unit e.g., TVR
1 BC0 Compact controller
2 Test hoses
3 VVS basic unit
4 Damper blade
Fig. 2: BC0 Compact controller
1 Type designation
2 Gear release button
3 Tube connections differential pressure
4 Service socket
5 Connecting cable
6 NFC interface
7Power/Test push button LED (green) function see table
Ä 11
8Status LED (yellow) function see table
Ä 11
9 Rotation stop
10 Axle mounting (clamping device or positive connection)
Structure and functional description
Product overview
Control component BC0-Compact for VAV terminal units10

Detection of operating states
Power LED (green)
State Operating status
OFF No supply voltage or fault
ON Operation
Press key Triggering of the rotation angle
adaptation (CLOSED-OPEN)
Status LED (yellow)
State Operating status
OFF Normal operation
ON Adaptation or synchronisation
process active
Flashing (irreg-
ular)
MP communication active
Flashing (reg-
ular)
Request for addressing from the
MP master or connected ZTH.
Press key Triggering of the addressing
3.2 Position of the damper blade
The position of the damper blade corresponds to the
mark on the shaft and is thus recognisable from the out-
side.
Positive lock connection
Fig. 3: Controller with lock connection
1 Shaft with marking for position indication
2 Damper blade
Clamping device (frictional connection)
Fig. 4: Controller with clamping device
1 Shaft with marking for position indication
2 Damper blade
3.3 Function description
Basic function
The Compactregler is an electronic control component
for variable volume flow control for various TROX VAV
terminal units. Its functional units consist of a dynamic
differential pressure transducer, the controller elec-
tronics and the actuator.
Closed control circuit
The controller operates in closed control circuit, i.e., to
measure – compare – control.
Fig. 5: Principle of operation of control components
1 Compact controller
2 Differential pressure transducer
3 Volume flow controller
4 Actuator
5 Setpoint value signal
6 Differential pressure sensor
The determination of the current volume flow rate takes
place by the differential pressure sensor (6) measuring
a differential pressure (effective pressure). The effective
pressure is forwarded through the measuring hoses to
the differential pressure transducer (2) integrated in the
control component and converted here into a voltage
signal.
Structure and functional description
Function description
Control component BC0-Compact for VAV terminal units 11

The volume flow rate actual value is thus available to
the internal control loop as well as an external use, e.g.,
central BMS or master-slave sequential circuit, either as
analogue voltage signal 0-10 V / 2-10 V or as digital MP
bus information.
The volume flow rate setpoint (5) is specified as a con-
stant value either by an analogue voltage signal or digi-
tally via MP bus at the setpoint value input. In regular
operation, the integrated actuator (4) is controlled by
permanent evaluation of the system deviation (setpoint
value-actual) of the volume flow controller (3) that
adjusts the damper blade of the air terminal unit via the
axle mounting and thus regulates the volume flow rate
to the setpoint value.
Due to the factory adjustment, the maximum output
value 10 VDC always corresponds to the nominal flow
rate (qvnom) indicated on the adjustment sticker on the
VAV terminal unit. The factory-set qvmin and qvmax values
can also be taken from the adjustment sticker or the
order code. The qvmin and qvmax value can be individually
adjusted at any time using the corresponding service
tools.
Setpoint value control independent of the duct pres-
sure
Fig. 6: Pressure independent control characteristics
The controller detects and corrects changes of the duct
pressure that may occur, for example, due to volume
flow rate changes from other units. The Compact con-
troller thus operates independently of the duct pressure,
and pressure fluctuations cause no lasting changes to
the volume flow rate.
In order to prevent the volume flow control from
becoming unstable, the controller maintains a dead
band (hysteresis) within which the damper blade is not
moved. This dead band and the tolerances of the meas-
urement lead to a volume flow rate deviation Δqv in
accordance with the product data sheets of the VAV ter-
minal units. If the conditions specified in the product
data sheets (e.g., minimum differential pressure,
upstream conditions) are not met, the controller will no
longer function correctly or more significant system
deviations can be expected.
Diagnostic options
A functional test is possible by means of test push
button ( Fig. 1 /8) and LED indicator light ( Fig. 1 /9).
The LED makes it possible to distinguish between oper-
ating and fault states.
Setting the controller,
Ä 7.1 ‘Setting of the control
component’ on page 23 .
3.4 Operating modes
3.4.1 Operation with constant volume flow
rate setpoint value
3.4.1.1 Operation with a fixed setpoint value
Fig. 7: Constant control
1 Compact controller
2 Factory-set volume flow rate setpoint value (qvmin)
3 Volume flow rate actual value as analogue voltage
signal or digital via MP bus e.g., to the central BMS
or slave controller
In the simplest case, the controller is operated with a
constant volume flow rate setpoint value specification.
The constant setpoint value (qvmin) is already set by the
factory presetting. Adaptation of the factory-set constant
values,
Ä 7.1 ‘Setting of the control component’
on page 23 .
The control signal at terminal Y is not allowed to be con-
nected in this case.
Structure and functional description
Operating modes > Operation with constant volume flow rate setpo...
Control component BC0-Compact for VAV terminal units12

3.4.1.2 Operation with two fixed setpoint values
(min./max. switching)
Fig. 8: Min./max. switching
1 Compact controller
2 Factory set volume flow rate setpoint values (qvmin
and qvmax)
3 Switch or relay for switching between qvmin and qvmax
4 Volume flow rate actual value as analogue voltage
signal or digital via MP bus e.g., to the central BMS
The factory-set constant values (qvmin and qvmax) can be
activated alternately by volt-free switch contacts.
Switching is accomplished by switches or relays, e.g.,
day/night switching. Adaptation of the factory-set con-
stant values with adjustment device,
Ä 7.1 ‘Setting of
the control component’ on page 23
3.4.2 Operation with variable volume flow
rate setpoint value
Fig. 9: Variable volume flow control
1 Compact controller
2 Factory-set volume flow rate setpoint value (qvmin
and qvmax)
3 Control signal as analogue voltage signal or digitally
via MP bus as setpoint value specification e.g., from
room temperature controller or DDC outstation or
the like.
4 Volume flow rate actual value as analogue voltage
signal or digital via MP bus e.g., to the central BMS
For the use of variable volume flow rate setpoint values,
the specification of an electrical control signal must be
made by a higher-level controller (e.g., room tempera-
ture controller, air quality controller, central building
management system, etc.). If the input signal is
changed, the controller adjusts the volume flow rate to
the new setpoint. The variable volume flow rate is
limited to a minimum and maximum volume flow rate
value,
Ä Chapter 3.5 ‘Characteristics’ on page 15 .
Adaptation of the factory-set constant values,
Ä 7.1
‘Setting of the control component’ on page 23
3.4.3 Override control
The constant or variable control can be disabled by
override controls, e.g., when the sash is open, a window
switch stops ventilation of the room by closing the
damper blade.
Further application examples:
Circuits for intensive ventilation (boost / qvmax)
Opening the damper blade
Structure and functional description
Operating modes > Override control
Control component BC0-Compact for VAV terminal units 13

3.4.4 Supply/extract air tracking control
Fig. 10: Supply/extract air tracking control
1 Master controller, e.g., Compact controller
2 Slave controller, e.g., Compact controller
3 Volume flow rate limit specification (qvmin and qvmax)
4 Room temperature controller (control signal for
supply air controller)
5 Volume flow rate actual value as analogue voltage
signal or digital via MP bus to the extract air con-
troller
6 Volume flow rate actual value as analogue voltage
signal or digital via MP bus e.g., to the central BMS
In individual rooms and closed-off office areas, where the balance between supply and extract air flow rate has to be
maintained. Otherwise, annoying whistling noises can occur at door gaps, and the doors can be difficult to open. For
this reason, the extract air should also have variable control in a VAV system.
The control signal from the room temperature controller is switched to the supply air controller in this example. The
actual value signal of the supply air controller is then connected to the extract air controller (slave controller) as a
setpoint value signal. The volume flow rate actual value of the supply air controller (master) is used as a reference
variable for the extract air controller (slave). The connection can be made as an analogue signal or digitally via the
Modbus. As a consequence, the extract air always follows the supply air.
Setting for the slave controller in the simplest case (same VAV terminal units and dimensions):
qvmin = 0 m³/h
qvmax = qvnom
ð qvnom is specified on the adjustment sticker.
When using different air terminal unit types or dimensions for tracking control, special setting instructions for qvmin
and qvmax of the slave controller must be observed due to the different nominal volume flow rates.
Alternatively, the control signal of the room temperature controller can also be connected in parallel to the supply air
and the extract air controller. The limitation due to the technical data of the controller outputs (current) and the con-
troller inputs (input resistances) must be observed.
Structure and functional description
Operating modes > Supply/extract air tracking control
Control component BC0-Compact for VAV terminal units14

3.5 Characteristics
Setpoint value signal
Fig. 11: Characteristic of the setpoint value signal
1 Characteristic with signal voltage range 0 – 10 VDC
2 Characteristic with signal voltage range 2 – 10 VDC
qvVolume flow rate
Y Set value input
In order to specify a volume flow rate setpoint value to
the Compactregler, a DC voltage signal in the range of
0–10 VDC or 2–10 VDC must be applied to terminal (Y).
The relationship between the volume flow rate setpoint
value and the associated voltage signal can be calcu-
lated from the formula below. The setting for qvmin and
qvmax must be considered in this case.
0 – 10 V DC
×
(q – q ) + q
qY
10 V
=vmin
vsoll vmin
vmax
2 – 10 V DC
q×(q – q )+q
Y– 2
(10 V– 2 V)
vsoll=vmax vmin vmin
Sample calculations
Ä Chapter 8.3.2 ‘Sample calculations’ on page 29
Actual value signal
Fig. 12: Characteristic of the actual value signal
1 Characteristic with signal voltage range 0 – 10 VDC
2 Characteristic with signal voltage range 2 – 10 VDC
qvVolume flow rate
U Actual value signal
The volume flow rate actual value can be tapped as a
voltage signal at the terminal (U). The measuring range
is factory-set to the size of the VAV terminal unit, so that
the respectively rated nominal flow rate (qvnom) always
corresponds to an actual value signal of 10 VDC.
The current volume flow rate actual value can be calcu-
lated from the measured voltage at the output (U) using
the formula below.
0 – 10 V DC
q× q
U
10 V
vist vnenn
=
2 – 10 V DC
q× q
U – 2
(10 V – 2 V)
vist vnenn
=
Structure and functional description
Characteristics
Control component BC0-Compact for VAV terminal units 15

Activation of override control CLOSED via characteristic
0 – 10 V characteristic 2 – 10 V characteristic
Setpoint value
signal Y
qvmin = 0 qvmin > 0 Setpoint value
signal Y
qvmin = 0 qvmin > 0
≤ 0.5 V Damper
CLOSED
Operation ≤ 2.4 V Damper
CLOSED
Operation
> 0.5 V Operation Operation > 2.4 V Operation Operation
Structure and functional description
Characteristics
Control component BC0-Compact for VAV terminal units16

4 Installation
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.
The Compactregler is delivered mounted on the VAV
terminal unit, so that the work is limited to the electrical
wiring
Ä 5 ‘Wiring’ on page 18 and to the setting Ä
7.1 ‘Setting of the control component’ on page 23 .
When installing the VAV terminal unit, take note of the
following points:
Upstream section
Direction of airflow
Fixing/suspension
Accessibility for service work
Information on this can be found in the VAV terminal unit
installation and commissioning instructions.
Installation orientation
The installation orientation of the VAV terminal unit is
arbitrary due to the dynamic differential pressure trans-
ducer in the Compactregler. The Compactregler can be
mounted on, under or at the side of the duct.
Installation
Control component BC0-Compact for VAV terminal units 17

5 Wiring
Safety instructions
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.
–Switch off the power supply before working on
any electrical equipment.
5.1 Installation instructions
The VAV terminal unit was manufactured and configured
on a project-specific basis. The control components are
factory-mounted and balanced. For installation, the
supply voltage and, if necessary, signal lines, must be
connected for electrical control components.
The connection is made according to the information
given on the control components or connection dia-
grams in this manual. These must be observed for
project-specific wiring diagrams. The voltage ranges
and the terminal connections specified on the control
components must be observed!
Personnel:
Skilled qualified electrician
Please note during installation:
Legal and official regulations, in particular VDE
guidelines.
Consideration of the technical connection rules
(TCR) of the local network operators.
Wiring work for supply voltage and signal lines to be
performed by others.
The rating and manufacture of customer-side con-
nections and wiring must be carried out in accord-
ance with the recognised rules of electrical engi-
neering.
Observe wiring guidelines and project-specific circuit
diagrams of the control component.
The electrical connection to the terminal unit must
only be made if the installation has been carried out
correctly.
The 24 V supply voltage must only be supplied with
a safety transformer.
If several volume flow rate controllers are connected
to a 24 V network, it must be ensured that a
common neutral or ground line is defined and not
interchanged.
The control component contains no parts that can
be replaced or repaired by the user and must only
be opened by the manufacturer.
Lay connecting cables in such a way that they
cannot be accidentally damaged by mechanical
impact or by heat.
Electrical safety
The control component complies with all relevant stand-
ards and guidelines, see declaration of conformity.
5.2 Connection diagrams
Connecting cable
2
+
1
-
Compact
5
U
3
Y
Fig. 13: Connecting cable
No. Function Wire colour
1 Ground, neutral Black (BK)
2 Supply voltage 24 VAC/DC Red (RD)
3 Setpoint value signal (Y)
0–10 or 2–10 VDC
White (WH)
5 Actual value signal (U)
0–10 VDC or 2–10 VDC or MP-
BUS
Orange (OG)
Wiring
Connection diagrams
Control component BC0-Compact for VAV terminal units18

Control constant volume flow rate qvmin
-+YU
1
Compact
235
24 V AC/DC
Fig. 14: Constant volume flow rate qvmin
After the 24 V supply voltage is applied, the controller
performs a synchronisation and then restricts the
volume flow rate to qvmin (factory setting). A setpoint
signal is not required. The current volume flow rate
actual value can be tapped at the terminal (U).
Control of constant volume flow rate qvmin or qvmax
(switching)
-+YU
1
Compact
235
24 V AC/DC
S1
Fig. 15: Switching volume flow rate qvmin / qvmax
If the volume flow rate between two constant values can
be switched (i.e., day/night switching), it is possible to
switch over between the volume flow rate setpoint
values qvmin and qvmax (factory setting) using an on-site
volt-free switch contact.
Switch S1 open - qvmin
Switch S1 closed - qvmax
Control constant mode / override controls
If the volume flow rate between several constant values
can be switched (e.g., day/night switching / CLOSED /
OPEN), it is possible to switch between four different
fixed volume flow rate setpoint values using on-site volt-
free switch contacts. A service tool is required to adjust
the volume flow setpoint values,
Ä ‘Overview of the
service tool functions’ on page 23 .
24 V AC/DC
Compact
+YU
1
-
235
TVOC CO2DDC
y
S5
S4
S3
S2
S1
Fig. 16: Staged operation
T Temperature sensor
VOC Room air quality sensor
CO2Carbon dioxide sensor
DDC Building automation
The functions shown in the tables refer to the switch
that is actuated in the case, more than one switch must
never be actuated.
Override controls CLOSED / qvmin / qvmax / OPEN
Switch 0 – 10 V control
input signal
2 – 10 V control
input signal
S1 closed qvmin CLOSED
S2 closed OPEN OPEN
S3 closed CLOSED CLOSED
S4 closed qvmax qvmax
S5 closed Room tempera-
ture control
Room tempera-
ture control
Note:
With DC supply, the functions S2 and S3 are not
available.
Wiring
Connection diagrams
Control component BC0-Compact for VAV terminal units 19

Control of variable volume flow rate qvmin…qvmax
24 V AC/DC
Compact
+YU
1
-
235
TVOC CO2DDC
y
Fig. 17: Variable volume flow control
If the volume flow rate is to be specified by a higher-
level controller (e.g., for room temperature, air quality or
a DDC outstation), its 0 – 10 (2 – 10) VDC output must
be connected by at least 2 wires (wires 1 and 3) to the
wires for the control signal (Y) of the Compact controller
in accordance with the connection diagram. With a
common supply voltage of 24 V, note that wire 1 on the
Compact controller is also ground for the control signal.
Parallel connection
24 V AC/DC
Compact
S1
+YU
1
-
235
+YU
1
-
235
+YU
1
-
235
Compact
Fig. 18: Parallel connection
If several Compact controllers are to be switched simul-
taneously with a switch contact between qvmin und qvmax,
the switch S1 must be designed as a changeover
switch, and the contact for qvmin operation must be con-
nected to the ground (wire 1)
Wiring
Connection diagrams
Control component BC0-Compact for VAV terminal units20