Belimo VAV-Compact D3 User manual

www.belimo.eu S4-VAV-Compact D3 • en • v2.1 • 02.2017 • Subject to changes 1 / 48
Product information VAV-Compact D3
VAV solutions for comfort applications
Table of contents
Product range overview volumetric flow and section pressure control 2
Technical data sheet
Brief description 3
Type overview 3
Technical data 4
Connection 5
VAV – variable operation min…max
5
CAV – step mode CLOSED / min / mid / max / OPEN 6
MP-Bus operation – VAV / CAV function 7
Dimensioning of supply and connecting cable 7
Tool connection 8
Compatibility 9
Safety notes 9
Dimensions 10
Functions
Table of contents 11
Conventional applications
Table of contents 27
MP-Bus Integration
Table of contents 33
Functional check
Table of contents 43
FCC: US-relevant notes 47

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VAV-Compact D3 Product range overview
volumetric flow and section pressure control
*
Function VAV Compact VAV Universal
LON/MOD types MP types VRP-M system solutions Universal program
Sensors
Controller
Actuators
Bus integration
Ventilator
optimisation DDC with
Optimiser function
Smartphone App
Service tool
Parameterisation
and Service
software
Room controllers
Positioners
Information: Documents on VAV-Compact LON version, VRP-M system solution, VAV-Universal, single room controllers CR24, CRA24, CRP24,
Fan Optimiser COU24-A-MP and Tools and Interfaces can be accessed as separate documents under www.belimo.eu.
* exclusively for VAV-Compact MP with integrated NFC interface (starting 2015).
LMV-D3LON
NMV-D3LON
LMV-D3-MP
NMV-D3-MP
LHV-D3-MP
VFP..
VRP-M
LMQ24A-SRV-ST
NMQ24A-SRV-ST
NM24A-V-ST
SF24A-V-ST with emergency
control function
VRD3
VRP
VRP-STP
LM24A-V
NM24A-V
SM24A-V
LF24-V with emergency
control function
SF24A-V with emergency
control function
ZTH-GEN
PC-Tool MFT-P
CR24..
CRA24..
SG..
VFP..
CRP24..
VFD3
LMV-D3-MOD
NMV-D3-MOD
ZTH EU
Into field bus systems via MP-Gateway.
LonWorks
®: Gateway UK24LON
Konnex: Gateway UK24EIB
Modbus RTU: Gateway UK24MOD
BACnet MS/TP: Gateway UK24BAC
Fan Optimiser COU24-A-MP
DDC with Optimiser function
Belimo
Assistant App *

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Technical data sheet VAV-Compact D3
VAV-Compact controller with integrated
pressure sensor, VAV controller and
damper actuator for pressure-independent
VAV and CAV applications in the comfort
zone
• Control:
DC 0/2 … 10V / MP-Bus
• Integration in bus systems
– DDC controller with MP interface
– LONWORKS®/Modbus systems
– Fan optimiser systems
• With additional switch-on option for
sensors and switches
• Diagnostic socket for Service and PC-
Tool
• NFC interface for Smartphone operation
Brief description
Application The digital VAV-Compact has PI control characteristics and is used for pressure-independent
control of VAV units in the comfort zone.
Pressure measurement The integrated maintenance-free Belimo D3 pressure valve sensor is also suitable for very small
volumetric flows. It is for this reason that it enables versatile applications in the comfort zone,
e.g. in residential construction, offices, hospitals, hotels, cruise ships, etc.
Actuator Three versions available, depending on the size of the VAV unit: 5 / 10 / 20 Nm.
– Rotary actuator, depending on the size
– Linear actuator 150 N with 100, 200 or 300 mm linear movement
Control function VAV-CAV or Open-Loop operation for integration in an external VAV control loop.
Feedback Damper position for fan optimiser systems, current volumetric flow or pressure value.
VAV – variable volumetric flow For variable volumetric flow applications with a modulating reference variable, e.g. room
temperature controller, direct digital control or bus system, it enables demand-related, energy-
saving ventilation of individual rooms or zones. The operating range min …max can be
connected via selectable mode.
The following are available: DC 2 … 10V / 0 … 10V / adjustable division / bus operation
CAV – constant volumetric flow For constant volumetric flow applications, e.g. in step mode, controlled by means of a switch.
The following operating modes can be selected from: CLOSED / min / (mid) / max / OPEN
Bus function Up to eight Belimo MP devices (VAV / damper actuator / valve actuator) can be connected
together over the MP-Bus and integrated into the following systems:
– LONWORKS® applications with Belimo UK24LON interface
– Konnex applications with Belimo UK24EIB interface
– Modbus RTU applications with Belimo UK24MOD interface
– BACnet applications with Belimo UK24BAC interface
– DDC controller with integrated MP-Bus protocol
– Fan optimiser applications with optimiser COU24-A-MP or DDC with Optimiser function
A sensor (0...10V or passive), e.g. a temperature sensor or a switch, can optionally be integrated
into the higher-level direct digital control or bus system via the MP-Bus.
Operating and service devices MP types: onboard NFC interface for Android Smartphone Assistant App.
PC-Tool or service tool ZTH.., pluggable on the VAV-Compact (PP connection) or via MP-Bus.
Assembly and connection The VAV-Compact device is connected using the prefabricated connecting cable.
Test function / test display The VAV-Compact features two LEDs with a functional readiness display for commissioning and
functional checking. Extended information with ZTH.. .
OEM factory settings The VAV-Compact is mounted on the VAV unit by the unit manufacturer, who adjusts and tests it
according to the application. The VAV-Compact is sold exclusively via the OEM channel for this
reason.
Type overview
Type Torque Power consumption Rating Weight
LMV-D3-MP 5 Nm 2 W 3.5 VA (max. 8 A @ 5 ms) Approx. 500 g
NMV-D3-MP 10 Nm 3 W 5 VA (max. 8 A @ 5 ms) Approx. 700 g
SMV-D3-MP 20 Nm 3 W 5.5 VA (max. 8 A @ 5 ms) Approx. 830 g
LHV-D3-MP 150 N 2.5 W 4.5 VA (max. 8 A @ 5 ms) Approx. 550 g
LMV-D3-MP NMV-D3-MP
SMV-D3-MP LHV-D3-MP

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Technical Data
Supply
Nominal voltage AC 24V, 50/60 Hz
DC 24V
Operating range AC 19.2 … 28.8 V
DC 21.6 … 28.8 V
Differential pressure sensor
Type, principle of operation Belimo D3 sensor, dynamic response
Operating range 0 … 500 Pa
Overload capability ±3000 Pa
Installation position Any, no reset necessary
Materials in contact with medium Glass, epoxy resin, PA, TPE
Control function – VAV-CAV
– Open-loop operation
Adjustment values
nom OEM-specific nominal volumetric flow setting, suitable for the VAV unit
∆p @ nom 38 ... 450 Pa
max 20 … 100% of nom
min 0 … 100% of nom
mid 50% of min to max
Classic control
VAV mode for reference value input Y
(Connection 3)
– DC 2 … 10V / (4 … 20 mA with 500 Ω resistance)
– DC 0 … 10V / (0 … 20 mA with 500 Ω resistance)
– Adjustable DC 0 … 10V
Input impedance min. 100 kOhm
Mode for actual value signal U5
(Connection 5)
– DC 2 … 10V
– DC 0 … 10V
– adjustable: volumetric flow, damper position or differential
pressure
max. 0.5 mA
CAV operating modes (constant volumetric flow) CLOSED / min / (mid *) / max / OPEN * (* only with AC 24V supply)
MP-Bus function
Address in bus operation MP1 … 8 (classic operation: PP)
LONWORKS® / Konnex / Modbus RTU / BACnet with BELIMO Interface UK24LON / UK24EIB / UK24MOD / UK24BAC
1 … 8 BELIMO MP devices (VAV / damper actuator / valve)
DDC controller DDC controllers/programmable controller with an integrated MP interface from various manufacturers
Fan optimiser (fan control) with BELIMO Fan Optimiser COU24-A-MP
Sensor integration Passive (Pt1000, Ni1000, etc.) and active sensors (0…10V), e.g. temperature, humidity
2-point signal (switching capacity 16 mA @ 24V), e.g. switches, occupancy switches
Operation and servicing MP types: onboard NFC interface for Android Smartphone Assistant App,
Pluggable / PC-Tool (V3.9 or higher) / service tool ZTH..
Communication PP/MP-Bus, max. DC 15V, 1200 baud
Push-button Adaption / addressing
LED display – 24V supply
– Status / bus function
Actuator Brushless, non-blocking actuator with power-save mode
Direction of rotation left / right or ↑ / ↓
Adaptation Capture of setting range and resolution to control range
Gear disengagement Push-button self-resetting without functional impairment
Sound power level max. 35 dB (A), SMV-D3-MP max. 45 dB (A)
Actuator - rotating
Angle of rotation 95° , adjustable mechanical or electronic limiting
Position Indication Mechanical with pointer
Spindle holder – Spindle clamp, spindle round 10 ... 20 mm / spindle square 8 ... 16 mm
– Form fit in various versions, e.g. 8 x 8 mm
Actuator – linear
Stroke 100, 200 or 300 mm, adjustable mechanical or electronic limiting
Connection Cable, 4 x 0.75 mm2
Safety
Protection class III Safety extra-low voltage
Degree of protection IP54
EMC CE according to 89/336/EEC
FCC: see US-relevant notes on page 47
VAV-Compact D3 Technical data sheet

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VAV-Compact D3 Technical data sheet
Connection
Connecting cable The connection is made using the connecting cable mounted to the VAV-Compact device.
Note
– Supply via safety isolating transformer!
– Connections 1 and 2 (AC/DC 24V) and
5 (MP signal) must be routed to accessible
terminals (room temperature controller, floor
distributor, control cabinet, etc.) in order to enable
access with the tool for diagnostic and service
work.
!
VAV – Variable operation min…max
Wiring diagrams Example 1:
VAV with analogue reference signal
Example 2:
VAV with shut-off (CLOSE), 2 ... 10V mode
PC-Tool
ZTH-GEN
..MV-D3-MP
~ T
+
_
U Y
AC 24 V
DC 24 V
T
_
~
+
T
23 15
PC-Tool
ZTH-GEN
..MV-D3-MP
~ T
+
_
U Y
AC 24 V
DC 24 V
T
_
~
+
T
23 15
Example 3:
VAV with analogue reference signal
supply/exhaust air in parallel operation
Example 4:
VAV with analogue reference signal,
in Master/Slave operation
PC-Tool
ZTH-GEN
..MV-D3-MP
~ T
+
_
U Y
AC 24 V
DC 24 V
T
_
~
+
T
23 15
PC-Tool
ZTH-GEN
..MV-D3-MP
~ T
+
_
U Y
2 3 1 5
PC-Tool
ZTH-GEN
..MV-D3-MP
~ T
+
_
U Y
AC 24 V
DC 24 V
T
_
~
+
T
23 15
PC-Tool
ZTH-GEN
..MV-D3-MP
~ T
+
_
U Y
2 3 1 5
VAV reference signal
0 … 10V / 2 … 10V
Tool / Actual value signal
0 … 10V / 2 … 10V
VAV reference signal
2 … 10V
Switching CLOSED / VAV mode
Tool / Actual value signal
0 … 10V / 2 … 10V
VAV reference signal
0 … 10V / 2 … 10V
Tool / Actual value signal
0...10V / 2...10V
Tool / Actual value signal
0 … 10V / 2 … 10V
Supply air
Exhaust air
VAV reference signal
0 … 10V / 2 … 10V
Tool / Actual value signal
0...10V / 2...10V
Tool / Actual value signal
0 … 10V / 2 … 10V
Master
Slave
CLOSED VAV
Technical data (continued)
Safety
Mode of operation Type 1 (in acc. with EN 60730-1)
Rated impulse voltage 0.5 kV (in accordance with EN 60730-1)
Control pollution degree 2 (in accordance with EN 60730-1)
Ambient temperature 0 … +50°C
Non-operating temperature –20 … +80°C
Ambient humidity 5 ... 95% r.h., non-condensing (in accordance with EN 60730-1)
Maintenance Maintenance-free
Reference signal Slave
No. Designation Wire colour Function
1
T –
black
– T
AC/DC 24V supply
2+ ~ red ~ +
3Y white Reference signal VAV/CAV
5U orange – Actual value signal
– MP-Bus connection

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VAV-Compact D3 Technical data sheet
CAV – Step mode CLOSED / min / mid / max / OPEN
CAV control Three options are available for the CAV control:
– CAV function Standard: 0.1 V shut-off level: CLOSED – min – max – OPEN (default setting)
– CAV function Standard: 0.5 V shut-off level: CLOSED – min – max – OPEN
– CAV function Old Generation (NMV-D2M): CLOSED – min – mid – max – OPEN
Wiring diagrams
a b c d e
T
..MV-D3-MP
~ T
+
_
U Y
AC 24 V
DC 24 V *
T
_
~
+
23 15
PC-Tool
ZTH-GEN
* Not available with DC 24 V supply.
CAV function: Standard
Mode
setting
–
0 … 10 V 0 … 10 V 0 … 10 V 0 … 10 V
2 … 10 V 2 … 10 V 2 … 10 V 2 … 10 V 2 … 10 V
Signal
T
0 … 10 V ~ ~ ~
– 2 … 10 V +
Function 3 3 3 3 3
Damper
CLOSED a) CLOSED c) CLOSED *
min ... max b) VAV
CAV – min All open – min active **
Damper
OPEN e) OPEN *
CAV – max d) max
Legend
Contact closed, function active
Contact closed, function active, only in 2 ... 10 V mode
Contact open
* Not available with DC 24 V supply
** The damper is closed when the 0.5 V shut-off level is used.
Example:
CAV application CLOSED – min – max
(mode 2 … 10 V)
PC-Tool
ZTH-GEN
..MV-D3-MP
~ T
+
_
U Y
AC 24 V
DC 24 V
T
_
~
+
2 3 1 5
a d
Note
In order to use the CAV step mid, the Old
Generation (NMV-D2M) CAV function must be
selected.
CAV function: Old Generation (NMV-D2M)
Mode
setting
–
0 … 10 V 0 … 10 V 0 … 10 V 0 … 10 V
2 … 10 V 2 … 10 V 2 … 10 V 2 … 10 V 2 … 10 V
Signal
T
0 … 10 V ~ ~ ~
– 2 … 10 V +
Function 3 3 3 3 3
Damper
CLOSED a) CLOSED
min ... max b) VAV
CAV – min All open – min active
Damper
OPEN e) OPEN *
CAV – max d) max
CAV – mid c) mid *
Legend
Contact closed, function active
Contact closed, function active, only in 2 ... 10 V mode
Contact open
* Not available with DC 24 V supply
Example:
CAV application min – mid – max
(Mode 0 … 10 or 2 … 10 V)
PC-Tool
ZTH-GEN
..MV-D3-MP
~ T
+
_
U Y
AC 24 V
T
~
2 3 1 5
c d
Note
– Supply via safety isolating transformer!
– Connections 1 and 2 (AC/DC 24V) and
5 (MP signal) must be routed to accessible
terminals (room temperature controller, floor
distributor, control cabinet, etc.) in order to enable
access with the tools for diagnostic and service
work.
!
VAV reference signal
Note
The contacts are mutually interlocking!
MP / Actual value signal
0 … 10V / 2 … 10V
Damper CLOSED CAV step min CAV step max
CAV step min CAV step mid CAV step max
MP / Actual value signal
Setting CAV function:
Standard (Default)
MP / Actual value signal
Setting CAV function:
Old Generation (NMV-D2M)
Note
«Standard 0.5 V shut-off» not use at:
– Mode 2 ... 10 V and MP bus operation
– Mode 2 ... 10 V and CAV control

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VAV-Compact D3 Technical data sheet
MP-Bus operation – VAV / CAV operation
Connecting cable The connection to the MP-Bus is made using the connecting cable mounted to the VAV-Compact
device.
Note
– Supply via safety isolating transformer!
– Connections 1 and 2 (AC/DC 24V) and
5 (MP signal) must be routed to accessible
terminals (room temperature controller, floor
distributor, control cabinet, etc.) in order to enable
access with the tools for diagnostic and service
work.
!
Wiring diagrams Control via MP-Bus
For detailed information, see section «MP-Bus
integration»
MP-Bus control with integrated switch
For detailed information on sensor integration,
see section «MP-Bus integration»
Note
– For further information about the connection,
override controls, MP-Bus cables, etc., see
section «MP-Bus integration»
– This is a connection description. Depending on
the application, the terminal allocation may vary.
The connection and commissioning must be
carried out by trained personnel. PC-Tool
ZTH-GEN
..MV-D3-MP
~ T
+
_
U Y
AC 24 V
T
~
2 3 15
MP
– + DC 24 V
PC-Tool
ZTH-GEN
..MV-D3-MP
~ T
+
_
U Y
AC 24 V
T
~
2 3 15
MP
– + DC 24 V
*)
*) e.g. window contact
MP address:
1 … 8
No. Designation Wire colour Function
1
T –
black
– T
AC/DC 24V supply
2+ ~ red ~ +
3Y white
Input for
– Sensor interface
– Override control
5U orange MP-Bus connection
MP address:
1 … 8
Dimensioning of supply and connecting cable
General In addition to the actual wire sizing, attention must also be paid to the surrounding area and
the cable routing.Signal cables must not be laid in the vicinity of load cables, objects liable to
cause EMC interference etc. if possible. Paired or layer stranded cables improve immunity to
interference.
24 V supply, dimensioning and cabling The dimensioning and installation of the AC 24V supply, the fuse protection and the cables
are dependent on the total operated load and local regulations. Account must be taken of the
following performance data, including the starting currents of the actuators:
– Dimensioning values VAV-Compact controller, see Technical data
– Dimensioning values of further controlling elements etc. can be found in the current data
sheets and product information
– Other devices which are intended to be connected to the same 24 V supply
– Reserve capacity for subsequent expansion, if planned.
MP-Bus integration – supply, dimensioning
and cabling See S4-VAV-Compact D3, MP-Bus integration, page 33 … 42

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VAV-Compact D3 Technical data sheet
Tool connection
Settings and diagnostics For simple checking and adaptation of the VAV unit, the VAV-Compact can be operated via the
integrated NFC interface using the Android Smartphone.
The more comprehensive settings and diagnostics of the connected VAV-Compact controller can
– thanks to MP bus technology – be checked and adjusted easily and rapidly with the Belimo
PC-Tool or with the ZTH.. service tool.
Smartphone – Belimo Assistant App The NFC antenna range of the VAV-Compact is located between Belimo or the OEM logo and
the NFC mark.
Align NFC-capable Android Smartphone, with Assistant App loaded, in such a way on the VAV-
Compact that the two NFC antennas are above one another.
Depending on the model of
the Smartphones, its antenna
could be located at a different
position
(see documentation for the
Smartphone).
On-board service connection The service connection integrated in the VAV-Compact enables rapid connection of the
operating devices ZTH.. and PC-Tool.
For the PC-Tool connection, the PC is connected per USB cable with the level converter ZTH EU
or ZIP-USB-MP.
BELIMO
PC-Tool
RJ12
USBZK1-GEN
1
2
GND
24 V
ZTH EU
(or ZIP-USB-MP)
MP connection (5) The VAV-Compacts can also communicate with the Service tools via the MP connection
(connection wire 5). The connection be set up during operations on-site, i.e. in the connection
socket, on the tool socket of the Belimo room temperature controller CR24 or at the tier or
control cabinet terminals.
white = GND
green = MP
blue not connected
BELIMO
PC-Tool
RJ12
USBZK2-GEN
1
2
GND
24 V
5
MP
GND
ZTH EU
(or ZIP-USB-MP)
NFC-capable devices
– LMV-D3-MP, NMV-D3-MP, SMV-D3-MP and
LHV-D3-MP with printed NFC mark
Non-NFC-capable versions
– All devices without NFC mark
– LMV-D3-MF
– ..-D3LON, ..-MOD and ..-KNX
Belimo VAV operating and service devices
Smartphone operation – Belimo Assistant App
Service tool
– ZTH-GEN (replace by ZTH EU)
– Service tool ZTH EU
Belimo PC-Tool, with level converter
– ZIP-USB-MP
– ZTH EU (with integrated MP-USB converter)
The Belimo Assistant App can be downloaded
via the Google Play Store (www.google.xx).

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VAV-Compact D3 Technical data sheet
Compatibility
Current overview An overview of the compatibility of the VAV-Compact controller with current and replaced
products can be found under www.belimo.eu.
VAV-Compact – Customer versions A VAV-Compact in a customer version is a device which has been specially produced for a
VAV unit manufacturer (OEM). These versions are adapted specifically for the sensors, damper
spindles and fastening systems of the OEM.
Retrofit – old Belimo or VAV controllers from
third-party manufacturers A special retrofit set is available for replacing old VAV controllers. Please contact your local
Belimo representative!
Replacement devices When replacement devices are ordered, they are parameterised at the OEM factory in
accordance with the installed system.
The VAV-Compact controller is sold exclusively via the OEM channel for this reason.
Tool versions See www.belimo.eu
Safety notes
!
• The device is not allowed to be used outside the specified field of application,
especially in aircraft or in any other airborne
means of transport.
• It may only be installed by suitably trained personnel.
Legal regulations and regulations issued by authorities must be observed during
installation.
• The device may only be opened at the manufacturer's site. It does not contain any parts that
can be replaced or repaired by the user.
• The cable must not be removed from the device.
• When calculating the torque required, the specifications supplied by the damper
manufacturers (cross-section, construction, place of installation), and the ventilation
conditions must be observed.
• The device contains electrical and electronic components and is not allowed to be disposed
of as household refuse. All locally valid regulations and requirements must be observed.
Designation: ..V-D3-MP yyy
1 2
1 Product designation, 2 Customer designation

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VAV-Compact D3 Technical data sheet
Dimensions [mm]
Dimensional drawings LMV-D3-.. Dimensional drawings NMV-D3-..
116
61
11622
66
41
Dimensional drawings SMV-D3-
139
64
88
131
30 41
Dimensional drawings LHV-D3-..
97
66
28
3.2
7
94
67
A
B
66
Type Max. stroke A B
LHV-D3-MP100 100 233-5 264.2
LHV-D3-MP200 200 333.5 364.2
LHV-D3-MP300 300 433.5 464.2
12125
80
41
124
62

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Functions VAV-Compact D3
Table of contents
Volumetric flow measurement / setting
Principle of operation VAV-Compact 12
Volumetric flow measurement 12
Nominal volumetric flow nom 13
Operating volumetric flow setting min / mid / max 13
Reference signal Y 14
Actual value signal U5
Actual value signal U5 – volumetric flow 15
Actual value signal U5 – damper position 15
Actual value signal U5 – differential pressure 16
Actual value signal U5 – adjustment 16
Control functions 17
Master-Slave sequential switching 20
Parallel circuit 21
Operation 22
LED function table 23
Settings 24
Operation and malfunction messages 25

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VAV-Compact D3 Functions
Volumetric flow measurement / setting
+–
+
–
D
A
Q
.
D
A
z
w



min
max
cw ... ccw
…
U
5
PP/MP
M
+–
10

2
0
Principle of operation VAV-Compact
Block diagram
The pressure value signal from the sensor is converted in the
measuring component (sensor electronics) into a signal proportional to
the volumetric flow. The reference signal w is conditioned as a setpoint
signal according to the operating volumetric flow setting min/max.
The current system deviation acts as the control signal for the
integrated actuator. The current volumetric flow is made available as an
actual value signal for indicating and controlling slave VAV controllers.
In combination with a precise differential pressure sensor, the specially
designed running time logic of the VAV-Compact guarantees high
control quality for the VAV unit in which it is installed.
You can choose between control with a classic control signal or via the
MP-Bus, depending on the application.

 = v · A
∆p
v
A
c

Volumetric flow measurement
The principle of the volumetric flow measurement is a pick-up device
which is usually installed in the air duct in the form of a measuring
diaphragm, a venturi nozzle or a measuring nozzle. Several measuring
procedures have established themselves on the market for the
recording of the volumetric flow.
Reliable and accurate differential pressure measurement – the key to
exact volumetric flow control
The differential pressure measurement used by Belimo permits a
reliable, averaging measurement, even with unfavourable inflow
conditions.
Each of the sensors used for recording the differential pressure has its
own dynamic behaviour. The influence of this measuring element in the
volumetric flow calculation is designated the device constant «c».
The sensor element is comprised of a centrally located heating element
with two temperature sensors aligned in the direction of the flow. A
temperature 'dome' forms above the heating element which is deformed
by the air flow in the direction of the flow. The resulting temperature
difference between the two temperature sensors is a measure of the
existing differential pressure on the sensor.
Features of the Belimo differential pressure sensor D3:
– Precise, proven heat transport measuring principle
– Minimal flow rate through the sensor, therefore insensitive to
contamination
– Null measurement required neither at the time of commissioning nor
during operation
– Suitable for every installation position
– maintenance-free and with long-term stability for versatile applications
– Parallel measurements are possible thanks to the very low air flow rate
– Display of the current differential pressure of –600 … 600 Pa
– The direction of flow is detected
Supply Δp microprocessor
Reference variable w
Sensor
electronics
Δp sensor Memory
Δp @ nom
Communication
Halomo
ASIC
controller
Actual value signal
AD
AD
Calibration data
Temperature
compensation
Linearization
PC interface
Amplifier Sensor
Chip
Legend:
 = Volumetric flow
c = Geometry-related constant of the
baffle device
Δp = Differential pressure
ρ = Medium density

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VAV-Compact D3 Functions
Volumetric flow measurement / setting (continued)
Nominal volumetric flow nom
Energy and acoustic considerations mean that the specific volumetric
flow for each duct diameter is not allowed to exceed a defined value.
The binding nominal volumetric flowis fixed by the unit manufacturer,
who is also responsible for the functionality of the VAV units.The
nominal volumetric flow setting entails adapting the VAV-Compact to
the installed VAV unit. The size, the nominal volumetric flow and the
operating parameters are taken into account and set. nom corresponds
to the maximum volumetric flow of the VAV unit at which the pressure
drop and noise are still within the permissible operating conditions.
The active calibration method used by Belimo, i.e. calibration with
a reference volumetric flow, compensates any deviations due to
mechanical tolerances in the manufacturing process.Since these values
and the operating data of each VAV unit are unique, this process is
carried out by the manufacturer when the unit is assembled in the
factory.
No subsequent settings are necessary on the system – helping to
significantly reduce installation and commissioning time and costs.
Operating volumetric flow setting min / mid / max
The linear characteristic curve of the air volume controller enables the
operating volumetric flows on the system side to be set easily.
This setting is usually carried out either by the unit manufacturer or
when the system is commissioned. max acts as the upper limit value
as a function of the nominal volumetric flow. min can be set as a
percentage of the required nom.
For constant air volume (CAV), an intermediate position mid at 50%
between min and max is available as needed. 1)
Function Volumetric flow Range
nom Nominal OEM-specific value, depending on the
VAV unit type and the application
max Maximum 20 … 100% of nom
min Minimum *0 … 100% von nom
(* OEM-specific)
mid 1) Intermediate position between min and max
* The minimum volumetric flow setting min varies according to the type of
VAV unit .
1) Requires CAV setting: NMV-D2M-compatible, see page 6.
Not available with DC 24 V supply.
0
[V]

nom
10
2
4
6
8
NW..
NW..
NW100 NW..
Volumetric flow
actual value signal U5
Volumetric flow
[m3/h]
Smallest
nominal width
Largest
nominal width
OEM unit range
Volumetric flow
0/2 V
0%
10 V
0%

min

max
nom

max
no
m

min max
20%
Range
Reference signal w

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VAV-Compact D3 Functions
Reference signal Y
Behaviour in the lower control range
The following descriptions explain the behaviour of the
VAV-Compact D3 in the lower control range. The different behaviours
arise on the one hand from the setting of the reference signal
(0 ... 10V / 2 ... 10V) and on the other hand from the set value for min .
0 V 10 V
0%

min

max
nom

[w]
0.5 V
Volumetric flow
Control limit
Reference signal 0 ... 10V and min >0%
As soon as the reference signal [w] which is connected to terminal 3 [Y]
of the controller falls below 0.5V, the volumetric flow unit adjusts to min
or to the lowest adjustable differential pressure.
0 V2 V
(0.6 ... 30 V)
10 V
(2.6 ... 32 V)
ZU

min

max
nom

[w]
0.1 V
(0.5 V)
Volumetric flow
Control limit
Reference signal 2 ... 10V (or adjustable) and min > 0%
As soon as the reference signal [w] which is connected to terminal 3
[Y] of the controller falls below 2.0V, the volumetric flow unit adjusts to
min or to the lowest adjustable differential pressure. The shut-off level
(damper CLOSED) is fixed at 0.1V, but can if necessary be set with the
PC-Tool to 0.5 V.
0 V0.55 V 10 V
ZU

min

max
nom

[w]
0.45 V
Volumetric flow
Control limit
Reference signal 0 ... 10V and min = 0%
The damper will close as soon as the reference signal [w] which is
connected to terminal 3 [Y] of the controller falls below 0.45V. The
controller will return to control mode when the signal rises again above
0.55V.
2 V2.44 V 10 V
ZU

min

max
nom

[w]
2.36 V
Volumetric flow
Control limit
Reference signal 2 ... 10V and min = 0%
The damper will close as soon as the reference signal [w] which is
connected to terminal 3 [Y] of the controller falls below 2.36V. The
controller will return to control mode when the signal rises again above
2.44V.
Note
«Standard 0.5 V shut-off» not use at:
– Mode 2 ... 10 V and MP bus operation
– Mode 2 ... 10 V and CAV control

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VAV-Compact D3 Functions
Actual value signal U5
Three measured variables
The VAV-Compact provides three measured values to choose from as
actual value signal:
• Volumetric flow as 0 … 100% nom (default setting)
• Damper position as 0 … 100% of the available angle of rotation
• ∆p actual value from 0 ... 100% of ∆p @ nom
The setting can be switched with PC-Tool (Version V3.6 or higher).
Actual value signal U5 – volumetric flow
The volumetric flow actual value signal U5 indicates the current
volumetric flow measured through the pick-up device of the VAV unit.
This value corresponds to 0 … 100% of the set nominal volumetric flow.
nom is set in the factory by the unit manufacturer and indicated on the
VAV unit nameplate
Example
with Mode
0 … 10V
Volumetric flow
[% nom]
Damper position
[% range of
rotation]
Range of
rotation
Example
with Mode
0 … 10V
Actual value signal U5 –
Volumetric flow
Damper position –
Actual value signal U5
0 10020 40 60 80
0 2 4 6 8 10 [V]
0 10020 40 60 80
0 2 4 6 8 10 [V]
Note
We recommend installing connection U5 (actual value signal / MP connection)
of each VAV controller in an accessible position, e.g.: room temperature
controller (CR24-Bx), floor controller, control cabinet. This allows you to use
setting and control functions without direct access to the VAV controller.
The actual value signal U5 – volumetric flow:
– Corresponds to 0 … 100% of nom
– Indicates the current actual volumetric flow
– Is not influenced by the min and max settings
– Has a shape that can be influenced by the mode and/or variable settings
– Must not be interconnected with the U5 signals of other VAV-Compact
controllers in conventional operation
Application:
• Reference signal for the slave unit in master / slave applications
• Volumetric flow indication, e.g. on BMS, totalising function
The actual value signal U5 – damper position:
– Corresponds to 0 … 100 % of the adapted damper range of rotation
– Indicates the current damper position
– Cannot be used to determine the current volumetric flow but is primarily
a function of the prevailing system supply pressure
– Has a shape that can be influenced by the mode and/or variable settings
– Must not be interconnected with the U5 signals of other VAV-Compact
controllers in conventional operation
Application:
• Indication, e.g. display on BMS
• Evaluation of the damper position for analogue-controlled fan
optimisation
Actual value signal U5 – damper position
The damper position actual value signal indicates the current damper
position.
The value is shown as 0 … 100% of the adapted, i.e. available, damper
setting range.

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VAV-Compact D3 Functions
Actual value signal U5(continued)
0 10020 40 60 80
0 2 4 6 8 10 [V]
Actual value signal U5 – differential pressure
The differential pressure actual value signal U5 indicates the current
differential pressure measured with the differential pressure sensor of
the VAV unit.
This value corresponds to 0 … 100% of the set ∆p @ nom. This value
is set in the factory by the unit manufacturer.
Actual value signal U5 – setting
• Influence of the mode setting on the actual value signal U5
The actual value signal U5 is influenced by the set operating range. If
the mode is set to 0 … 10 V, the display range of the U5 signal is
0 … 10 V while if the mode is 2 … 10 V, the display range is 2 … 10 V.
• Adjustable actual value signal U5
The U5 signal can be adapted with the PC-Tool U5 feedback function for
special applications; adjustable operating range:
– Starting point DC 0.0 … 8 V
– End point DC 2.0 … 10 V
The actual value signal U5 – differential pressure:
– Corresponds to 0 … 100% ∆p @ nom
– Indicates the currently existing differential pressure
– Has a shape that can be influenced by the mode and/or variable settings
– Must not be interconnected with the U5 signals of other VAV-Compact
controllers in conventional operation
Application:
• Pressure monitoring in Open Loop operation, e.g. filter monitoring
• Display, e.g: Display on BMS
Example
with Mode
0 … 10V
Differential
pressure
[% ∆p @ nom]
Actual value signal U5 –
Differential pressure

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VAV-Compact D3 Functions
Control functions
100% 30 40 20 50 60 70 80 90
0 100 10 20 30 50 60 70 80 90 40
nom
max
max
mid 1)
min

min
CAV / VAV and open loop control functions
The VAV-Compact can be operated with either of two control functions:
• CAV / VAV operation (default setting)
• Open loop operation
The setting can be switched with PC-Tool (Version V3.6 or higher).
CAV / VAV operation
This control function corresponds to the conventional CAV / VAV
function.
• CAV (constant air volume) control in step mode CLOSED / min /
mid / max / OPEN.
For step control acting on input terminal 3, see page 6.
Application
Step-controlled CAV application, e.g.:
– Occupancy switch min / max or
– Meeting room with veto push-button for flushing mode min / max
The VAV-Compact adjusts the volumetric flow to the fixed selected
value in constant air volume applications. One or more operating
modes can be specified as required.
The following operating modes are available:
CLOSED / min / mid 1) / max / OPEN
– Shut-off operation – damper CLOSED:
The damper is moved into the CLOSED position (0%).
– max / mid / min operating modes:
The VAV-Compact adjusts the volumetric flow to the fixed selected
value.
– Flushing operation – damper OPEN:
The damper can be opened (100%) for maximum ventilation, in which
case air volume control is deactivated.
1) Requires CAV setting: NMV-D2M compatible, see page 6.
Not available with DC 24V supply.
Open
(depending on
supply pressure)
CAV operating
mode 2 … 10 V
Volumetric flow
[%nom]
Constant operation
CLOSED

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VAV-Compact D3 Functions
Control functions (continued)
Volumetric flow
[%nom]
Actual volumetric
actual value signal
U5
8 6 2 4
30 40
100% 30 40 20 50 60 70 80 90
0 100 10 20 50 60 70 80 90
10
0
2
4
6
8
[V] 10 [V]

max

nom
min
min
max
Reference signal Y
Example with
Mode 2 … 10V
Constant
operation
Variable
operation
VAV (variable air volume) controller min … max
Corresponds to the VAV reference value input Y
Application
Room temperature-controlled VAV application, e.g.:
– Belimo CR24 room temperature controller (Mode 2 ... 10V) or
– Third-party controller with 0 … 10V output (Mode 0 ... 10V)
VAV – reference signal Y
The reference signal Y allows the volumetric flow to be controlled
linearly within the bandwidth of the set operating volumetric flows. This
allows ventilation to be controlled according to demand, for example in a
conference room where the volumetric flow increases continuously from
the minimum setting (hygiene ventilation) up to the maximum value as a
function of the room temperature.
The output signal of a master controller or a setpoint generator is
supplied to the reference value input of the VAV-Compact for this
purpose. This signal controls the volumetric flow linearly in the set
operating volumetric flow range.
The reference signal Y
– Controls linearly in the min … max
– Is used to control the VAV-Compact in VAV and CAV applications
– Has a shape that can be influenced by the mode and / or variable
settings
Variable air volume operation (VAV)
The required volumetric flow is specified linearly in the min … max
range by means of an analogue reference signal or via the MP-Bus.
Shut-off operation (CLOSED) with min 0%
If a shut-off function is required in VAV operation, it can be achieved by
setting min to 0%.
Shut-off operation (CLOSED)
The following function can be implemented with a 0 … 10 V signal in
2 … 10 V mode:
Reference signal Y Volumetric flow Function
< 0.1 V * (0.5 V) 0 Damper CLOSED,
VAV controller inactive
0.2 … 2 V (0.6 ... 2 V) min Operating level min active
2 … 10 V min … max Modulating operation
min … max
* Please note: The controller / DDC must be capable of pulling the reference
signal to 0 V.

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VAV-Compact D3 Functions
Control functions (continued)
Open-loop operation
This control function deactivates the integrated CAV / VAV control
function. The VAV-Compact works as a modulating actuator with an
integrated volumetric flow sensor.
• Typical application: Pressure-independent control of CAV / VAV units
in the comfort zone, with utilisation of an external volumetric flow
controller.
• Actuator, control via Y:
– The actuator is controlled by means of an analogue control signal,
e.g. 0 … 10 V, and moves to the defined position.
– Running time: The running time in open loop mode is fixed at 150 s.
• Volumetric flow, measurement via U5:
– Actual value signal: selectable signal (0 … 10 V or 2 … 10 V)
corresponding to 0 … 100% nom. The nom setting is made by the
manufacturer of the VAV unit.
Application
New or retrofit solutions in connection with VAV controllers without
actuator and sensor unit from various third-party manufacturers, e.g.:
– Siemens RXC ...
– TAC Xenta ...
The switching between volumetric flow and differential pressure
display (U5) takes place with the PC-Tool (Version 3.6 or higher).
• Differential pressure measurement via U5:
– Actual value signal: selectable signal (0 … 10 V or 2 … 10 V)
corresponding to 0 … 100% ∆p @ nom. The ∆p @ nom setting is
made by the manufacturer of the VAV unit.
Open loop in MP-Bus mode
The open loop function was developed for analogue control. Open loop
operation is available in principle, even in MP-Bus mode, although the
transfer time of the data is still subject to the cycle time of the MP-Bus.
Implementation of a VAV control loop through the MP-Bus, based on
the open loop function, is for this reason not permitted.
PC-Tool
ZTH-GEN
..MV-D3-MP
U Y
AC 24 V
T
~
~
T
Note
The VAV control circuit – in open loop operation – is the responsibility of the
supplier of the VAV controller.
VAV-Compact
«Open Loop» operation
Third-party VAV controller
0 ... 100% control signal
0 ... 100% volumetric flow

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VAV-Compact D3 Functions
0 10020 40 60 80
[V]
nom
10
0
2
4
6
8
max max
min
T
MS
1
2
Master / slave connection
Room pressure ratio
In a master / slave connection, any changes in the air system of the
master (supply pressure too low, e.g. due to a pressure control fault)
are detected and reported to the slave. This guarantees an equal
percentage ratio of supply air to exhaust air.
In a master / slave configuration, only one controller can act as master.
However, one master controller can control several parallel slave
controllers.
When are master / slave connections used?
• In systems with air volume controllers in the supply and exhaust air
that are required to work sequentially
• When an equal percentage ratio of supply air to exhaust air is
specified.
Operating volumetric flow settings
The max- and min values used for the required volumetric flow are
set on the master and transferred to the slave by means of a reference
signal.
CAV application
In constant air volume applications, operating mode control (CLOSED /
min etc.) is only set on the master controller.
Slave setting if the room pressure ratio is balanced
The min setting on the slave is always 0%. If the room pressure ratio
is 1:1 and all controllers are the same size, the slave controller is set to
max 100% / min 0%.
Slave setting if the room pressure ratio is unbalanced
The min setting on the slave is always 0%.
Setting with % scale on the ZTH-GEN service-tool
The ratio of slave volume to master volume is set as follows with the
max value on the slave controller:
SUPPLY
EXHAUST
Reference signal Y
Example with mode:
0 … 10 V
The ratio is set with the max
parameter on the slave
Volumetric flow
[%nom]
The slave min setting «0%» forms the pivot
and intersection point
Room
Equal percentage
ratio
max S% = max S • nom M •100
max M • nom S
max S% = max value that must be set on the controller in %
nom M = Nominal volume of the master unit in m3/h
max M = Maximum volume of the master unit in m3/h
nom S = Nominal volume of the slave unit in m3/h
max S = Maximum volume of the slave unit in m3/h
Example
Required: Positive pressure in the room with 20% excess air
– Supply air unit: nom 1600 m3/h / max 1500 m3/h
– Exhaust air unit: nom 2400 m3/h / max 1200 m3/h
Find: max setting of the slave controller
Setting with PC-Tool / ZTH-GEN
These two setting tools can be used to enter the volumetric flow ratio
directly in m3/ h, ll/s or cfm, i.e. there is no need to calculate the setting
ratio.
53% = 1200 • 1600 •100
1500 • 2400
Determination of the master controller
If both units have:
– Non-identical nom settings, the controller with the lower
nom.
– Identical nom settings, the controller with the higher air
volume setting acts as master
– Positive pressure in the room
Master: Supply air unit Slave: Exhaust air unit
– Negative pressure in the room
Master: Exhaust air unit Slave: Supply air unit
Principle:
1. A reference signal, e.g. from a room temperature controller, is connected to the master
input. min and max are set on the master controller.
2. The volumetric flow actual value signal from the master acts as a reference signal for the
slave controller. The master is installed on the supply or exhaust air side, depending on
the application. See “Determination of the master controller“.
For connection diagram, see page 5 … 6
Slave Master