Belimo VAV-Compact D3 Product Information

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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

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 – L

ONWORKS

/Modbus systems

– Fan optimiser systems

• With additional switch-on option for sensors and switches

• Diagnostic socket for Service and PCTool

• 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, energysaving 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 U

(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) L

ONWORKS

/ 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 mm

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

U Y

AC 24 V

DC 24 V

23 15

PC-Tool ZTH-GEN

..MV-D3-MP

U Y

AC 24 V

DC 24 V

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

U Y

AC 24 V DC 24 V

23 15

PC-Tool ZTH-GEN

..MV-D3-MP

U Y

2 3 1 5

PC-Tool ZTH-GEN

..MV-D3-MP

U Y

AC 24 V DC 24 V

23 15

PC-Tool ZTH-GEN

..MV-D3-MP

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

–

black

– T

AC/DC 24V supply

~ red ~ +

Y white Reference signal VAV/CAV

U 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

..MV-D3-MP

U Y

AC 24 V

DC 24 V *

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

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

U Y

AC 24 V

DC 24 V

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

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

U Y

AC 24 V

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

U Y

AC 24 V

2 3 15

– + DC 24 V

PC-Tool ZTH-GEN

..MV-D3-MP

U Y

AC 24 V

2 3 15

– + DC 24 V

*) e.g. window contact

MP address: 1 … 8

No. Designation Wire colour Function

–

black

– T

AC/DC 24V supply

~ red ~ +

Y white

Input for – Sensor interface – Override control

U 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 VAVCompact 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

USB

ZK1-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

USB

ZK2-GEN

1 2

GND 24 V

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

11622

Dimensional drawings SMV-D3-

139

131

Dimensional drawings LHV-D3-..

3.2

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

124

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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

Operating volumetric flow setting 

min

/ 

mid

/ 

max

Reference signal Y 14 Actual value signal U

Actual value signal U5 – volumetric flow 15 Actual value signal U

– damper position 15

Actual value signal U

– differential pressure 16

Actual value signal U

– 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

+–

+ –

z w 



min max

cw ... ccw …

PP/MP

+–



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.

∆



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

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.

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

Intermediate position between 

min

and 

max

* The minimum volumetric flow setting 

min

varies according to the type of

VAV unit

Requires CAV setting: NMV-D2M-compatible, see page 6.

Not available with DC 24 V supply.

[V]



nom

NW..

NW100

NW..

Volumetric ﬂow actual value signal U

Volumetric ﬂow [m3/h]

Smallest nominal width

Largest

nominal width

OEM unit range

Volumetric ﬂow

0/2 V

10 V



min



max

nom



max



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



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)



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



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



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 U

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 U

–

Volumetric ﬂow

Damper position – Actual value signal U

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 U

(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 U

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 U

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 U

(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 U

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 U

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 U

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 U

–

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



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

– 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.

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 U

8 6 2 4

30 40

100% 30 40 20 50 60 70 80 90

0 100 10 20 50 60 70 80 90

[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

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 U

– 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

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



max



max



min

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

•100



max

M • 

nom



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 m

/ 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

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VAV-Compact D3

Functions

Parallel connection

Room pressure ratio

In a parallel connection, the two VAV units are operated independently of one another with a common reference signal. The operating volumetric ﬂows of the supply and exhaust air units must be set according to the required room pressure ratio.

The supply and exhaust air controllers work independently of one another, i.e. if a fault occurs in the supply or exhaust air system, the room pressure ratio is impaired for technical reasons. In the worst case, the unit tolerances may be accumulated. This circumstance must be taken into account by the project planning engineer.

When are parallel connections used?

• If air volume controllers operate with parallel supply and exhaust air (controlled by a common reference variable)

• If the supply and exhaust air devices have different sizes and different minimum and maximum volumetric flow settings

• If constant differential control is active between the supply and exhaust air

• In systems with several supply and exhaust air devices

• In circulating air systems for airtight rooms.

Operating volumetric ﬂow settings

The 

max

and 

min

values used for the required volumetric ﬂow must be

set on each VAV controller.

CAV application

In constant air volume applications, operating mode control (CLOSED / min etc.) is set on both controllers.

Setting if the room pressure ratio is balanced

Owing to the proportional assignment of the reference signal to the value ranges for 

max

and 

min

, it is possible to operate VAV units with different nominal widths and differentiated ranges parallel to one another.

Setting if the room pressure ratio is unbalanced

The operating volumetric ﬂows of the supply and exhaust air units must be set according to the difference:

• Positive pressure ratio in the room

Supply air volume > exhaust air volume

• Negative pressure ratio in the room

Exhaust air volume > supply air volume

SUPPLY

ABL

SUP. EXH.

Room

Principle:

The reference signal of the temperature controller is connected in a parallel circuit with the reference value inputs of the supply and exhaust air controllers. The operating volumetric ﬂows 

max

and 

min

are set on both controllers.

For connection diagram, see page 5 … 6

0 100 10 30 40 50 60 70 80 90

100% 30 40 20 50 60 70 80 90

[V]



min



min



max



max

Volumetric ﬂow [%

nom

]

Volumetric ﬂow actual value signal U

, example with

mode 0 … 10V

Constant Supply/exhaust air difference

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VAV-Compact D3

Functions

Operation

Tool connection (1)

Enables the direct connection of a Belimo operating device, e.g.: PC-Tool, ZTH-GEN service tool for adjusting or checking the VAV-Compact. This connection is also available with an active MP integration.

Gear disengagement (2)

At the time of commissioning, the damper blade can be adjusted by hand with the aid of the push-button (2) on the VAV-Compact. Manual overrides are possible at any time – even under voltage – without limiting the functioning of the device. In order to avoid deviations in control mode, a synchronisation is carried out after each manual override – with visual display (4, Status LED).

Power and operating display (3)

The status of the 24V voltage supply and the operational readiness of the VAV-Compact is displayed by the green LED (Power).

Synchronisation (2) – with visual display (4)

In order to prevent permanent deviations caused by an actuation of the gear disengagement (2), a synchronisation of the position calculation is carried out. This ensures a correct position modulation of the damper blade.

The progress of the function can be seen on the Status LED (4)

. Deviations caused by a manual override are excluded as a result. This synchronisation acts at the same time as a simple functional check. The synchronisation behaviour can be adjusted in accordance with the utilisation.

Angle of rotation adaption (3) – with visual display (4)

This function detects the upper and lower spindle end stops and stores them in the VAV-Compact. The running time and the working range are adapted to the available angle of rotation. Detection of the mechanical end stops enables a gentle approach to the end position and protects the actuator and damper mechanisms. The progress of the function can be seen on the Status LED (4). The adaption behaviour can be adjusted in accordance with the utilisation.

Bus function – Addressing (4)

During the addressing, the VAV-Compact is assigned an MP-Bus address (MP1 … 8) and the device is switched in bus function. For the process, see the section: MP-Bus integration

Display of active MP-PP communication (4)

During the addressing, the VAV-Compact is assigned an MP-Bus address (MP1 … 8) and the device is switched in bus function.

NFC logo (5) and NFC antenna range (6)

Devices with NFC logo (5) have the antenna in the area marked (6)

Operating and display elements: 1 Tool connection with cover

2 Gear disengagement 3 Button 1 «Adaption» LED 1 «Power» 4 Button 2 «Address» LED 2 «Status» 5 NFC logo 6 NFC antenna range

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VAV-Compact D3

Functions

LED function table

Application Function Description / action LED pattern

Adaption

LED 1 Power LED 2 Status

Address

N1 operation Status information

– 24V power supply OK – VAV-Compact ready for operation

LED 1

LED 2

S1 service function Synchronisation

Synchronisation started by: a) Operating / service device b) Manual disengagement on the

VAV-Compact

c) Power On behaviour

LED 1

LED 2

LED 1

LED 2

S2 service function Adaption

Adaption started by: a) Operating / service device b) Button on VAV-Compact

LED 1

LED 2

LED 1

LED 2

LED 1

LED 2

B1 bus control

Addressing via MP master: (acknowledgement on VAV-Compact)

a) Addressing triggered on the MP master

LED 1

LED 2

LED 1

LED 2

LED 1

LED 2

LED 1

LED 2

LED 1

LED 2

LED 1

LED 2

LED 1

LED 2

LED 1

LED 2

b) Press the address pushbutton

LED indicates active communication again as soon as the addressing function has finished

LED 1

LED 2

LED 1

LED 2

LED 1

LED 2

LED 1

LED 2

LED 1

LED 2

LED 1

LED 2

LED 1

LED 2

LED 1

LED 2

LED 1

LED 2

B2 bus control

Addressing via MP master (with serial number)

Addressing triggered on the MP master, LED indicates active communication again as soon as the addressing function has ﬁnished

LED 1

LED 2

LED 1

LED 2

LED 1

LED 2

LED 1

LED 2

LED 1

LED 2

LED 1

LED 2

LED 1

LED 2

LED 1

LED 2

LED 1

LED 2

LED 1

LED 2

B3 bus control communication

MP-PP communication

Indicates active communication with the MP master or an operating / service device

LED 1

LED 2

LED 1

LED 2

LED 1

LED 2

LED 1

LED 2

LED 1

LED 2

LED 1

LED 2

LED 1

LED 2

LED 1

LED 2

LED 1

LED 2

LED 1

LED 2

LED 1

LED 2

Legend:

Green LED (power) lit Yellow LED (status) lit

Yellow LED lit intermittently

Start Sync time

Start Adaption time

On event MP communication

Not addressed MP communication

MP communication

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VAV-Compact D3

Functions

Settings

Function Adjustment values, limits

Operating device

Remarks, notes

PC-Tool

V3.9.2

ZTH-GEN

System-speciﬁc settings



max

20 … 100% of 

nom

r / w r / w



min

0 … 100% of 

nom

r / w r / w Mode 0 … 10V / 2 … 10V r / w r / w – Reference signal Y

(terminal 3)

– Start value: 0.6 ... 30V – Stop value: 2.6 ... 32V

r / w –

Actual value signal U (terminal 5)

– Start value: 0.6 ... 8V – Stop value: 2.6 ... 10V

r / w –

Address MP1 … MP8 r / w r / w MP-Bus address Position 16 characters r / w r Display in operating and bus devices Designation 16 characters r / w r Display in operating and bus devices

Feedback U

– function

Volumetric ﬂow / damper position differential pressure

r / w –

Controller function Volumetric ﬂow / open loop r / w –

Unit-speciﬁc settings



nom

Unit-speciﬁc value r / (w) r

Value is permanently set by the OEM at the

time of calibration

∆p @ 

nom

Unit-speciﬁc value r / (w) r Unit manufacturer-speciﬁc setting parameters

Reset OEM values w w Reactivating OEM basic values (

max

/ 

min

)

NFC interface

– read only – reading and writing

r / (w) – Function is permanently set by the OEM

Range of rotation

– Adapted 30 … 95° – Electronically limited 30 … 95°

r / w

–

Direction of rotation for Y = 100%

– cw – ccw

r / w r / w

Torque 100 / 75 / 50 / 25% r / w –

Special settings

Response when switched on

– No action – Adaption – Synchronisation

r / w – Power On behaviour

Synchronisation behaviour

– Y = 0% – Y = 100%

r / w – Synchronisation to Y = 0 or 100%

Bus fail position

– Last setpoint – CLOSED – 

min

– 

max

– OPEN

r / w –

MP-Bus function: Behaviour with bus master failure

Sensitivity Normal / muted r / w – Setting for open loop input signal

CAV functions

– Standard 0.1V shut-off – Standard 0.5V shut-off – Old generation (NMV-D2M)

r / w –

Displays

Control loop display Actual – set volume deviation r r Display: Setpoint, actual value

Version overview

– Firmware – Config table ID

r r

r –

Operating data

– Operating time – Running time – Ratio

r r r

–

Alarm messages

– Setting range enlarged – Mechanical overload – Stop & Go ratio too high

r / w

–

Series number nnnnn-nnnnn-nnn-nnn r r Belimo designation: ID and series number Type Type designation r r Belimo product designation

Note: Setting data can be saved and printed out with the PC-Tool (V3.9.2 or higher).

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VAV-Compact D3

Functions

Operation and malfunction messages

Recording of operating data

The VAV-Compact controller records the following operating data, which can be uploaded via the PC-Tool or, in the case of MP-Bus integrations, via the MP-Bus master:

Operating time

Operating hours during which the VAV-Compact was connected to the supply.

Active time

Operating hours during which the VAV-Compact was mechanically in movement and was connected to the supply.

Stop & Go ratio

Ratio of active time/operating time (calculation = active time [h] / operating time [h] x 100)

The VAV-Compact generates the error messages described below under corresponding operating conditions. The error messages are legible with the PC-Tool and are displayed in the bus master with MP-Bus integrations.

"Actuation path increased"

If, in the case of an angle of rotation that is limited, e.g. to 60°, a mechanical defect (angle of rotation limitation incorrectly set or loose) causes the setting range to be suddenly >60°. This is detected by the VAV-Compact and the aforesaid message is generated.

Mechanical overload

The actuator is stopped before the expected end position of 0% or 100%. Possible causes include incorrect adaption, mechanical obstacle or that the damper requires an excessively high torque (is damaged, ageing). If this message is present , then the ring running of the damper and the area should be checked. Afterwards, the actuator should be readapted and the message deleted.

"Stop & Go ratio too high"

If the Stop & Go ratio exceeds 20% – i.e. the actuator is too often in movement in terms of its operating time – then the message "Stop & Go ratio too high" will be generated. Possible cause: an unstable reference signal, e.g. caused by swings in the upstream room temperature cascade.

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VAV-Compact D3

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Conventional applications VAV-Compact D3

Table of contents

Single duct plant

CAV room solution with motion detector 28 VAV room solution with 0 … 10V control 29 VAV room solution with room controller CR24 30

Dual duct installations

VAV two-duct solution with room controller CR24 31

Additional VAV applications, including material lists and speciﬁcation texts, can be found in the Applications library CR24 at www.belimo.eu

Energy-optimised VAV/CAV system solutions for fan regulations in the room ventilation applications.

Function and product description plus typical applications can be found in the System Documentation Optimiser COU24-A-MP at www.belimo.eu

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VAV-Compact D3

Conventional applications

AC 24 V

CAV 2

2) 1)

CAV 1

Single-duct systems

IRC-VAV

CAV room solution with motion detector

Wiring diagram

Notes

• Connection and terminal designations of the motion detector in accordance with the manufacturer‘s specification

• Mode setting on the CAV controller: 0 … 10 V oder 2 … 10 V

Master-Slave

parallel

CAV single-duct plant, occupancy-controlled

Volumetric ﬂow 

max



min

Brief description

Control solution for CAV single-room application

CAV single-duct system, occupancy-controlled Stand-alone operation or integrated in a building automation system (I/O integration)

Functions

The CAV controller is controlled by means of the motion detector in two modes on the basis of room occupancy 

min

… 

max

– Room unoccupied: constant air volume 

min

– Room occupied: constant air volume 

max

Motion detector

With switching output for low switching capacity (load 0.24 mA)

VAV-Compact control device

..MV-D3-MP

VAV-Compact control device for supply air, exhaust air or mixing units, comprising a sensor, VAV controller and actuator for pressure-independent air volume controls.



min

Motion detector

Room occupied

Room not occupied



max

Actual value

signal

Actual value

signal

Functional diagram

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VAV-Compact D3

Conventional applications

Wiring diagram

Notes

• Connection and terminal designations in accordance with the controller manufacturer’s specification

• Mode setting on the VAV controller: 0 … 10 V

VAV single-duct system, room temperature-controlled

0 … 10V

Brief description

Control solution for VAV single-room application

VAV single-duct system, room temperature-controlled Stand-alone operation or integrated in a building automation system (I/O integration)

Functions

The 0 … 10 V single-room or DDC controller controls the VAV controller with a variable air volume in the range from 

min

… 

max

, depending on the room cooling needs.

Single-room or DDC controller

With 0 … 10 V output signal (cooling sequence). Controller functions in accordance with the manufacturer‘s speciﬁcation.

VAV-Compact control device

..MV-D3-MP

VAV-Compact control device for supply air, exhaust air or mixing units, comprising a sensor, VAV controller and actuator for pressure-independent air volume controls.

Single-duct systems

(continued)

IRC-VAV

VAV room solution with 0 … 10 V control

[V]

ao1

[°C]

Functional diagram

Volumetric ﬂow 

max



min

AC 24 V

VAV 2

2) 1)

VAV 1

Reference signal 0 … 10 V

Actual value signal 0 … 10 V *

* Input or auxiliary terminal

Room / DDC controller

Master-Slave

parallel

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VAV-Compact D3

Conventional applications

CR24-B1

EHO St-By

AC 24 V

12 786

ao1

di2

ai1/di

VAV 2

2) 1)

VAV 1

0...10V

Wiring diagram Input and output assignment

VAV single-duct system, room temperature-controlled

EHO

CLOSED

Brief description

Control solution for VAV single-room application

VAV single-duct system, room temperature-controlled Stand-alone operation or integrated in a building automation system (I/O integration)

Functions

The CR24-B1 single-room controller controls the connected VAV controllers with a variable air volume in the range from 

min

… 

max

, depending on the room cooling needs. Other functions can be optionally connected (e.g. with a motion detector): energy hold off, standby, etc.

Room temperature controller

CR24-B1

(automatic) CR24-A1

Room temperature controller (15 … 36°C) with an integrated or external temperature sensor

• Mode selection with a pushbutton and three LEDs: AUTO, ECO (reduced room temperature for

standby or night operation) and MAX (flushing operation with 15’ timer)

• Room protection function (frost / excess temperature)

• Inputs for energy hold off, standby operation, external temperature sensor, summer / winter

compensation

• VAV system output

• Self-resetting start-up and service function

• Tool connection for diagnostics, settings and trend recordings

VAV-Compact control device

..MV-D3-MP

VAV-Compact control device for supply air, exhaust air or mixing units, comprising a sensor, VAV controller and actuator for pressure-independent air volume controls.

Note

For technical data and a detailed description of functions, see CR24 product information.

Single-duct systems

(continued)

IRC-VAV

VAV room solution with CR24 room controller

]

ao1

[°C]

Functional diagram



min



max

Notes

• Further VAV applications such as boost (fast heat up), night cool down (air heated with water or electrically), night cooling, combination available with chilled ceiling. See www.belimo.eu

• Mode setting for VAV controller for this application: 2 … 10 V

Master-Slave

parallel

External

temperature sensor

External

shift

Note

Terminal designations in accordance with the Belimo ﬁnal controlling element.

Functions Description Assignment

VAV VAV system output (0) 2 ... 10 V Output ao1

Optional functions Description Assignment

EHO Energy hold off (window) Input di1 Sensor External temperature sensor NTC 5K Input ai1 Shift External shift 0 ... 10 V

(Summer / Winter compensation)

Input ai2

Conﬁguration, settings

DIP switches

P-Band

normal

wide

di2

Stand by

Change over

Setpoint WH range: 15 … 36 °C

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VAV-Compact D3

Conventional applications

CR24-B1

AC 24 V

12 786

ao1

di2

ai1/di

0...10V



max



max



min

[°C]

Dual-duct systems

IRC-VAV

VAV dual-duct solution with CR24 room controller

VAV dual-duct system, room temperature-controlled

P-band cooling

Brief description

Control solution for VAV single-room application

VAV dual-duct system, room temperature-controlled Stand-alone operation or integrated in a building automation system (I/O integration)

Functions

The two air volume controllers mix the hot and cold air supplied by the dual-duct air conditioning system to obtain the condition requested by the CR24-B1 room temperature controller. The constant air volume (CAV) controller for the hot air adjusts to the set 

max

volume for heating. The variable air volume (VAV) controller for the cold air adds the variable amount of cold air requested by the room temperature controller. If cooling needs exceed the hot air volume, the hot-air part is shut off and only cold air is supplied.

Optional: The cold-air part can be shut off by means of a switching contact at input d1.

Room temperature controller

CR24-B1

(automatic) CR24-A1

Room temperature controller (15 … 36°C) with an integrated or external temperature sensor

• Mode selection with a pushbutton and three LEDs: AUTO, ECO (reduced room temperature for

standby or night operation) and MAX (flushing operation with 15’ timer)

• Room protection function (frost / excess temperature)

• Inputs for cold air shut-off, external temperature sensor, summer / winter compensation

• VAV system output

• Self-resetting start-up and service function

• Tool connection for diagnostics, settings and trend recordings

VAV-Compact control device

..MV-D3-MP

VAV-Compact control device for supply air, exhaust air or mixing units, comprising a sensor, VAV controller and actuator for pressure-independent air volume controls.

Information

For technical data and a detailed description of functions, see CR24 product information.

Mixing range

Heating Cooling

kü

Supply air temperature

Volumetric ﬂow

Hot air

Cold air

kü

Hot

Cold

Functional diagram

Wiring diagram Input and output allocation

External NTC

temperature sensor

External

shift

Cold air shut-off

VAV controller for adding cold air

CAV controller for hot air

St-By

Functions Description Assignment

VAV VAV system output (0) 2 ... 10 V Output ao1

Optional functions Description Assignment

Shut-off CA Cold air shut-off Input di1 Sensor External temperature sensor NTC 5K Input ai1 Shift External shift 0 ... 10 V

(Summer / Winter compensation)

Input ai2

Conﬁguration, settings

DIP switches

P-Band

normal

wide

di2

Stand by

Change over

Setpoint WH range: 15 … 36 °C

Notes

• Terminal descriptions correspond to the Belimo actuator connection.

• Mode setting for VAV controller for this application: 2 … 10 V

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VAV-Compact D3

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MP-Bus Integration VAV-Compact D3

Table of contents

MP-Bus Integration

General 34 Principle of operation 34 Integration for L

ONWORKS

34 Integration for EIB/KNX systems 35 Integration with direct digital control/programmable controllers 35 Integration with Fan Optimiser COU24-A-MP 35 Addressing 36 Connection, MP-Bus topology, power supply and cabling 36 Signal cable lengths 37 Control / operating volumetric flow settings 39 Bus fail function 40 Sensor integration 41

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VAV-Compact D3

MP-Bus Integration

Principle of operation

MP address

The assignment of an MP address turns a standard VAV-Compact into a bus-capable system controller with considerable added value.

In bus mode, the VAV-Compact controller is supplied with a reference signal over the MP-Bus from the higher-level building automation system and adjusts to the speciﬁed volumetric ﬂow. The VAV-Compact is switched to MP-Bus mode automatically as soon as it is assigned an MP address. One active or passive sensor or one switch can be connected to each VAV-Compact. This input value can be used in the higher-level system, e.g. for VAV control in room temperature or other applications.

MP-Bus

The VAV-Compact can be interconnected with up to eight Belimo MP devices (damper actuators, valve actuators, VAV-Compact controllers) thanks to the integrated communication principle over the Belimo MP-Bus. These slave devices are supplied by the higher-level bus master with a digital control signal over the MP-Bus and then opened to the position dictated by this signal.

Integration for LONWORKS

The  certiﬁed UK24LON gateway connects the Belimo MP-Bus with LONWORKS®. Up to eight MP actuators can be connected on the MP-Bus side. The UK24LON allows the actuators to be digitally controlled via the MP-Bus and send back their current operating status. It converts the digital information from the controller and the feedback into standardised network variables (SNVTs). The functions of the ﬁeld devices can thus be directly integrated into LONWORKS®.

Damper actuator object #8110

The actuator object is used to map the functions of the MP actuators to the LONWORKS® network. There are eight of these objects in the UK24LON, i.e. one per MP actuator.

Open loop sensor object #1

An optional sensor or switch can be connected to each MP actuator. The open loop sensor object transfers the linked sensor values to the LONWORKS® network. VAV controllers are also available in a  certiﬁed LON version as an alternative to costeffective integration via the UK24LON: LMV-D3LON / NMV-D3LON.

Controller object #8060

A temperature controller is integrated in each actuator. This makes it easy to implement individual room control solutions.

For more detailed information, see UK24LON Product Information.

For the direct integration of VAV controllers in a LONWORKS® system there are new VAV-Compact controllers available in a certiﬁed  version:

• LMV-D3LON

• NMV-D3LON

MP-Bus

LONWORKS

UK24LON

Ethernet

Node Object #0

nviRequest SNVT_obj_request

nvoStatus SNVT_obj_status

nvoFileDirectory SNVT_address

Conﬁguration Properties

SCPTdevMajVer (165) SCPTdevMinVer (166) SCPTobjMajVer (167) SCPTobjMinVer (168)

Damper Actuator Object #8110

nviRelStpt SNVT_lev_percent

nviActuatState SNVT_switch

nvoActualValue SNVT_lev_percent

nvoAbsAngle SNVT_angle_deg

nvoAbsAirFlow SNVT_ﬂow

Conﬁguration Properties

nviManOvrd SNVT_hvac_overid

SCPTobjMajVer (167) SCPTobjMinVer (168)

SCPTminSendTime (52) SCPTmaxSendTime (49) SCPTmaxRcvTime (48) SCPTminDeltaAngl (43) SCPTminDeltaFlow (47)

SCPTactuatorType (41) SCPToemType (61) SCPTlocation (17) SCPTnomAngle (58) SCPTnomAirFlow (57) SCPTminSetpoint (53) SCPTmaxSetpoint (50) SCPTdriveTime (45) SCPTdirection (44)

LONWORKS

Open Loop Sensor Object

SNVT_xxx

MP-Bus

General

Conventional or via MP-Bus

VAV-Compact controllers can be controlled either conventionally or via the MP-Bus. Integrations in LONWORKS®, EIB/Konnex, Modbus RTU, BACnet MS/TP or DDC systems with an MP interface can thus be realised simply and inexpensively.

Up-to-date and more detailed information about bus solutions: www.belimo.eu.

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VAV-Compact D3

MP-Bus Integration

VAV 1

VAV 8

DDC

MP-Bus

Integration for EIB/Konnex, Modbus RTU and BACnet MS/TP systems

The respective Belimo Gateway allows up to eight MP actuators or VAV-Compact controllers to be digitally controlled via the MP-Bus and to report back their current operating status. The digital information from the controller and the feedback are translated in the Gateway into telegrams of the respective ﬁeld bus system. The functions of the MP ﬁeld devices can thus be directly integrated into these systems.

Sensor connection

An optional sensor or switch can be connected to each MP actuator. The analogue sensor values are digitised in this way and transferred to the higher-level system.

For more detailed information, see product information UK24EIB, UK24MOD und UK24BAC.

MP-Bus

Integration with DDC / PLC controllers

DDC / PLC devices with an MP interface are available from several manufacturers. These control devices can thus communicate directly and digitally with the connected MP ﬁeld devices.

Sensor integration

An optional sensor or switch can be connected to each MP actuator. The analogue sensor values are digitised in this way and supplied to the DDC / PLC system for its control functions.

MP-Bus protocol

DDC / PLC manufacturers who would like to implement the MP-Bus protocol in their controllers can be provided with the technical speciﬁcations on request.

For more information, please contact the DDC / PLC supplier or your Belimo representative.

MP-Bus

Integration with COU24-A-MP Fan Optimiser

MP-Bus controlled variable and constant air volume systems for room ventilation applications

with fans controlled by a frequency converter. The system is operated by the Fan Optimiser with optimum damper positions based on the

current demand signals. The objective is to keep the pressure loss through the VAV units as low as possible and thus permanently reduce operating costs by decreasing the fan output.The damper positions of each VAV-Compact controller are recorded, transferred via the MP-Bus to the Fan Optimiser and used there as a control variable for regulating the fan controlled by the frequency converter.

As a result of this technology – which is based on the Belimo MP-Bus – up to 50% energy savings can be achieved compared to conventional systems with fans controlled by air-duct pressure.

System size: Any Number of VAV / CAV units per Fan Optimiser: 1 … 8

For more detailed information, see

• COU24-A-MP Fan Optimiser system description

• COU24-A-MP product information

MP-Bus

Frequency converter

Ventilator

Room 1

Room 8

Room 9 …

Fan Optimiser

Expandable

Field bus

UK24EIB UK24MOD UK24BAC

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VAV-Compact D3

MP-Bus Integration

Addressing

Each device in a bus system must be uniquely identiﬁable. Each MP slave must therefore be assigned an address. Address range: MP1 … 8

The slaves can be addressed either directly on the MP master unit or by means of a Belimo operating device. They are addressed using the serial number (numerical / barcode) or with the address pushbutton on the MP device.

Procedure: Refer to the documentation for the MP master unit or the PC-Tool online help (<F1> function).

MP1

MP master

MP2

MP4

MP3

MP5

MP8

MP7

MP6

Connection, MP-Bus topology, power supply and wiring

MP-Bus connection

The MP-Bus connection is a network for 1 … 8 Belimo MP devices. Like the VAV-Compact, it consists of a 3-pole connection for MP-Bus communication and the AC or DC 24 V power supply.

Neither special cables nor terminating resistors are required for the wiring.

AC 24 V DC 24 V

5 3 2 1

MP3…8

..MV-D3-MP

PC-Tool ZTH-GEN

..MV-D3-MP

The cable lengths (see calculation overleaf) are limited by: – The sum of the performance data of the connected MP devices,

– The type of supply (AC 24 V via the bus or DC 24 V) – The cable cross-section.

MP-Bus topology

The cables of up to eight MP devices / VAV controllers can be laid in a freely deﬁnable bus topology. The following topologies are permitted: star-shaped, ring-shaped, tree-shaped or mixed forms.

Up to 8 actuators (•)

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VAV-Compact D3

MP-Bus Integration

1000

100

020406080 100 120 140 160 180

Cable lengths

Limits

The cable lengths (see calculation below) are limited by:

• The sum of the performance data of the connected devices, e.g. LMV-D3-MP 4 VA / 2 W

• The type of supply (AC 24 V or DC 24 V)

• The cable cross-section.

MP-Bus cable length for AC 24V supply

via the bus cable

Total power rating of VAV controllers [VA]

Cable length vs. power rating applies to AC supply (minimum transformer voltage AC 21.6 V)

Calculation of the maximum cable lengths (AC 24V)

The power ratings (VA) of the individual devices must ﬁrst be added together. The corresponding cable lengths can then be read from the graph.

Example:

MP-Bus with 5 x LMV-D3-MP Total power rating: 5 x 4 VA = 20 VA

Values read from the graph:

• Cable with wire Ø 0.75 mm

requires: Cable length 28 m

• Cable with wire Ø 1.0 mm

requires: Cable length 40 m

• Cable with wire Ø 1.5 mm

requires: Cable length 54 m

• Cable with wire Ø 2.5 mm

requires: Cable length 100 m

AC 24 V

MP1 MP2 MP8

1 GND 2 AC 24 V 5 MP

L = max. cable length [m]

MP master

Power rating [VA]

Cable length [m]

0.75 mm

1.5 mm

1.0 mm

2.5 mm

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VAV-Compact D3

MP-Bus Integration

1000

100

0102030405060708090 100

Signal cable lengths

(continued)

MP-Bus cable length for DC 24V supply

via the bus cable

Total dimensioning of VAV controllers [W]

Cable length vs active power applies to DC supply (minimum supply voltage AC 24.0 V)

Calculation of the maximum cable lengths

The power consumption [W] of the individual devices must ﬁrst be added together. The corresponding cable lengths can then be read from the graph.

Example:

MP-Bus with 5 x LMV-D3-MP Total power rating: 5 x 2 W = 10 W

Values read from the graph:

• Cable with wire Ø 0.75 mm

requires: Cable length 75 m

• Cable with wire Ø 1.0 mm2 requires: Cable length 100 m

• Cable with wire Ø 1.5 mm2 requires: Cable length 130 m

• Cable with wire Ø 2.5 mm2 requires: Cable length 250 m

Bus cable length for local

AC 24V supply

If the VAV controllers are supplied locally with AC 24V via a separate transformer, the cable lengths can be signiﬁcantly increased. The cable lengths indicated in the table apply regardless of the performance data of the connected actuators.

1 GND 5 MP

L = max. cable length [m]

AC 24V AC 24V AC 24V

Active power [W]

Cable length [m]

0.75 mm

1.5 mm

1.0 mm

2.5 mm

DC 24 V

MP1 MP2 MP8

1 GND 2 + DC 24 V 5 MP

L = max. cable length [m]

MP master

Maximum length of bus cable for local AC 24 V supply

Wire Ø mm2 L = max. cable length [m]

0.75

8001.0

1.5

MP1 MP2 MP8

MP master

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VAV-Compact D3

MP-Bus Integration



max



min



min



max



nom

Control / operating volumetric ﬂow settings

Reference variable and actual volumetric ﬂow in bus mode

In bus mode, the reference variable is speciﬁed to the VAV-Compact as a digital signal by the higher-level system via the MP-Bus. The actual volumetric ﬂow signal and the current damper position are supplied to this system for display or control functions.

The 0 ... 100% setpoint selected via the MP-Bus is resolved by the 

min

/ 

max

setting of the VAV-Compact controller, i.e.: the – 0% setpoint corresponds to 

min

volume

– 100% setpoint corresponds to 

max

volume

Operating volumetric ﬂow setting 

min/max

* The 

min

must be set to 0% for shut-off operation. For VAV operation, on the other hand, a minimum value

higher than the minimum setting limit should be used. See page 14.

Open operating volumetric ﬂow setting

The 

min

/ 

max

setting can be open if necessary, i.e. the two values can be set to 0 and 100%. In this case, the volumetric ﬂow must be limited in the higher-level system. This operating setting allows the limitation of the volumetric ﬂow to be adjusted without altering the parameters on the VAV controller. Responsibility for the limiting function passes from the OEM to the system supplier or integrator.

Master / slave and parallel control

Master / slave control

The actual volumetric ﬂow is read from the master VAV controller by the higher-level system and speciﬁed to the slave controller as a reference signal.

Parallel control

If the VAV units are operated in parallel, the setpoints for the supply and exhaust air VAV units are transferred in parallel to the two VAV controllers.

Positive and negative room pressure

If a system with positive or negative room pressure is planned, the room pressure ratio must be taken into account in the setpoint calculation.

Higher-level system with MP-Bus interface

Ofﬁce 1

Ofﬁce 2

Ofﬁce 3

Ofﬁce 4

MP-Bus interface

Data

MP-Bus

Ofﬁce 1

Ofﬁce 2

Ofﬁce 3

Ofﬁce 4

VAV controller with MP-Bus connection

Reference signal

e.g. UK24LON nviRelStpt

Volumetric ﬂow [% 

nom

]

Actual volumetric ﬂow signal e.g. UK24LON nvoActualValue

Reference signal

e.g. UK24LON nviRelStpt

Example: VAV application with UK24LON

Function Volumetric ﬂow Range



nom

Nominal OEM-speciﬁc value, depending on the

application and the VAV unit type



max

Maximum 20 … 100% of 

nom



min

Minimum 0 *… 100% of 

nom

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VAV-Compact D3

MP-Bus Integration

Bus fail function

Response to bus failure

It is possible to specify the response to an MP-Bus failure, essential maintenance work, faults, etc. on each VAV-Compact controller. This setting can be displayed or changed in PC-Tool (Version V3.9 or higher).

The following functions are available:

• CLOSED

• 

min

• 

max

• OPEN

• Last value (default setting, last setpoint command received from the bus master)

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VAV-Compact D3

MP-Bus Integration

Sensor integration

Mode of operation

An additional sensor or switch can be connected to the VAV-Compact in MP-Bus mode independently of the VAV control loop. The sensor signal is connected to the reference value input that is not used in MP-Bus mode (connection 3). The VAV-Compact then acts as an analogue / digital converter for transmitting the sensor signal to the higher-level system. This system must know the physical address (which sensor is connected to which MP device) and be capable of interpreting the corresponding sensor signal. If possible, the sensors should be connected using separate cables to prevent compensation currents. The sensor ground (GND) cable, as a minimum, should be laid separately from the power supply cable over as long a distance as possible.

MP-Bus cycle time

Typical value 2 … 8 s Dependent on the number of connected MP devices and sensors.The cycle time must be taken into account in the application and / or implementation!

Switching contact connection

For external switching contacts with control functions in the higher-level system, e.g. window switch for energy hold-off when the window is open, light switch (auxiliary contact) for occupancy-controlled standby circuit. The cycle time must be taken into account in the implementation!

Switching contact requirement

The switching contact must be able to accurately switch a current of 16 mA at 24V.

Reference signal Y setting if a switch is connected

The VAV-Compact must be set to 2 ... 10 V mode to enable the states of a connected switch to be evaluated: The setting can be changed with PC-Tool or a ZTH.. .

See «Settings», page 24.

Passive sensor connection

Passive resistance sensors, e.g: Pt1000, Ni1000, NTC, for open and closed-loop control functions in the higher-level system, such as a temperature sensor for monitoring the minimum room temperature. The cycle time must be taken into account in the implementation!

Reference signal Y setting for passive sensor integration

No special settings are required.

Active sensor connection

Active 0...10 V sensors for open and closed-loop control functions in the higher-level system, such as a humidity or CO2 sensor. The cycle time must be taken into account in the implementation!

Reference signal Y setting for active sensor integration

No special settings are required.

Signals that can be linked in

• Active sensor with DC 0 … 10 V signal

• Passive resistance sensor, e.g. Pt1000, Ni1000, NTC

• Switching contacts

PC-Tool ZTH-GEN

..MV-D3-MP

U Y

AC 24 V

2 3 15

– + DC 24 V

*) e.g. window contact

MP address: 1…8

PC-Tool ZTH-GEN

..MV-D3-MP

U Y

AC 24 V

2 3 1 5

– + DC 24 V

MP address: 1…8

Room temperature sensor e.g. Pt1000

PC-Tool ZTH-GEN

..MV-D3-MP

U Y

AC 24 V

2 3 1 5

– + DC 24 V

0…10V

e.g. moisture sensor

MP address: 1…8

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VAV-Compact D3

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Functional check VAV-Compact D3

Table of contents

Functional check

Procedure 44 Analysis of faulty behaviour 44 Error description, symptoms, causes and rectification 45

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VAV-Compact D3

Functional check

Example:

Analysing faulty behaviour

Symptoms, causes and rectiﬁcation

Various fault symptoms, their possible causes and recommended rectiﬁcation steps are described below. Based on past experience, the faulty behaviour is probably due to the settings or control mode rather than to the air volume controller itself. A structured approach is essential to identify the most efﬁcient remedy regardless of the particular malfunction:

Flow chart

Report to manufacturer

Possible cause: Damper already in end position

Check:

• Move damper manually into mid-position

Reaction: Actuator moves to end

position Actuator does not move

Functional check

Press manual pushbutton for

gear disengagement Reaction: Actuator moves to end

position Actuator does not move

Possible cause: No 24 V supply

Check:

• Is power LED (green) on device lit? If not:

• Measure power supply in control cabinet and on VAVCompact

• Correct fault

Possible cause: Damper blocked

Check:

• Check damper mobility by means of manual adjustment

• Correct fault

Step 1:

Determine and make a note of the actual state

Step 4:

• Rectify the fault

• Check the functions

Actual state

Volumetric ﬂow too low Supply air unit (master) Damper (100%) → open

Exhaust air unit (slave): Damper in control range

Note the state:

– Reference signal w (#3)

6.5 V – Actual value U5 (#5): 3.5 V – Damper position 100%

Functional check

Compare

Damper 100% and volumetric ﬂow too low

↕

«Insufﬁcient volumetric ﬂow, damper open in end position»

Rectify

• Check the supply air fan

• Rectify the fault

Cause

Supply air fan output too low

Functional check

Step 2:

Functional check

Step 3:

Compare the faulty behaviour with the described symptoms

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VAV-Compact D3

Functional check

Fault descriptions, symptoms, causes and rectiﬁcation

Insufﬁcient volumetric ﬂow, damper OPEN in end position

Symptom Possible cause Rectiﬁcation steps

Set volume not reached although damper is 100% open (end stop)

Air hoses between pick-up device and pressure sensor have been interchanged or are not connected

Monitoring with ZTH-GEN Connect air hoses correctly. Observe + / –

Fan failure Check the fan, including the control functions,

and rectify the fault

Fire dampers tripped, i.e. closed Check whether all ﬁre and/or shut-off dampers

between the fan and the VAV unit are open

Fan air output too low Check whether all ﬁre and/or shut-off dampers

between the fan and the VAV unit are open

Some or all rooms are often set positively (manually) to maximum volumetric ﬂow when the system is started up. Consequence: The fan is unable to produce the required air output (simultaneity factor)

Deactivate override control and/or reduce the reference signal

Insufﬁcient volumetric ﬂow, master damper OPEN / slave damper CLOSED

Symptom Possible cause Rectiﬁcation steps

Set volume not reached:

• Damper of master unit is open

• Damper of slave unit is closed

VAV units in master / slave connection:

• Master in air shortage situation (fan defective or OFF), i.e. damper is 100% open

Check the fan in the line of the master unit and rectify the fault

• Slave does not receive reference signal from master because master does not measure actual volume → damper CLOSED

Check whether all ﬁre and/or shut-off dampers between the fan and the master unit are open

Volumetric ﬂow too high, damper CLOSED

Symptom Possible cause Rectiﬁcation steps

Set volume not reached and damper closed although reference signal is present

see «Behaviour in the lower control range», page 14

Increase the 

min

parameter Adjust the reference signal or correct the VAV-Compact mode setting

Damper closes (0%) instead of opening to 

min

value

VAV-Compact set to 2 … 10 V mode but controlled with 0 … 10 V reference signal

Change the VAV-Compact mode setting to 0 … 10 V

Volumetric ﬂow too high, damper OPEN

Symptom Possible cause Rectiﬁcation steps

Actual volume too high, damper open at end stop Pressure hose squeezed off (jammed) Check the pressure hoses:

– Mark the ± connections – Pull the pressure hoses off of the VAV-Compact – Blow through the hose lines

pick-up device, pressure hose or pressure sensor contaminated

Check the parts and clean them if necessary: – Mark the ± connections –

Pull the pressure hoses off of the VAV-Compact

– Clean and blow out the

pick-up device – Blow through the hose lines – Blow out the pressure sensor on the

VAV-Compact and connect the hand pump to

the (minus) connection. Remove any visible dirt – Mount the pressure hoses – Carry out a functional check

Note:

The differential pressure sensor of the VAV-Compact does not normally need to be cleaned

Volumetric ﬂow too low, damper in control range

Symptom Possible cause Rectiﬁcation steps

Required volumetric ﬂow not reached Reference signal (DDC, room controller) limited

by software

Check the reference signal (DDC, room controller) and adjust the limitation

VAV-Compact set to 2 … 10 V mode but controlled with 0 … 10 V reference signal

Correct the VAV-Compact mode setting

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VAV-Compact D3

Functional check

Fault descriptions, symptoms, causes and rectiﬁcation

(continued)

Volumetric ﬂow too high, damper in control range

Symptom Possible cause Rectiﬁcation steps

Steady-state deviation of volumetric ﬂow (too high) relative to reference signal

VAV-Compact set to 0 … 10 V mode but controlled with 2 … 10 V reference signal

Adjust the reference signal or correct the VAV-Compact mode setting

Positive / negative room pressure, damper in control range

Symptom Possible cause Rectiﬁcation steps

Undesirable positive or negative pressure in room Clamp loose, turns without spindle driver Check the clamp mounting

Room pressure ratio not set correctly Check the operating volumetric ﬂow setting

Master / slave application with limited operating volumetric ﬂow setting on slave controller

Check the operating volumetric ﬂow setting. If the room pressure is balanced, the slave setting should be as follows: 

min

0% / 

max

100% (for

an identical nominal width and air volume)

Wiring incorrect, VAV units interchanged (master / slave or parallel connection)

Example:

Supply air ofﬁce a and exhaust air ofﬁce b Supply air ofﬁce b and exhaust air ofﬁce a

Check the wiring and correct it if necessary

VAV units set to master / slave but controlled in parallel

Air volume controller does not react to reference signal

Symptom Possible cause Rectiﬁcation steps

VAV controller adjusts to ﬁxed value and does not react to reference signal changes

0 / 2 … 10 V reference signal has no reference, i.e. ground connection (GND) is missing

Measure the signal between VAV-Compact terminals 1 (GND) and 3 (0 / 2 … 10 V) Check the wiring and correct it if necessary

Polarity of reference signal and ground (GND) reversed

Measure the signal between VAV-Compact terminals 1 (GND) and 3 (0 / 2 … 10 V) Check the wiring and correct it if necessary

AC 24 V connection reversed. If several devices are connected to the same AC 24 V transformer, this connection must be in phase

Check the wiring and correct it if necessary

Operating mode (override control) active Check the controller

Damper does not move

Symptom Possible cause Rectiﬁcation steps

Damper does not move Clamp loose, turns without spindle driver Check the clamp mounting

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VAV-Compact D3

FCC (relevant only for US market)

FCC notes

This device complies with part 15 of the FCC: Operation is subject to the following two conditions:

1. This device may not cause harmful interference, and

2. this device must accept any interference received, including interference that may cause undesired operation.

The following statement applies to the products covered in this manual, unless otherwise speciﬁed herein. The statement for other products will appear in the accompanying documentation.

NOTE:

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: – Reorient or relocate the receiving antenna. – Increase the separation between the equipment and receiver. – Connect the equipment into an outlet on a circuit different from that to which the receiver is

connected.

– Consult the dealer or an experienced radio / T.V. technician for help.

Page 48

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