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NEW! Halton Max MOS – Airflow management damper (VAV)

Halton Max MOS is a rectangular airflow management damper that needs no safety distances.

This airflow management damper is also designed to function at very low air velocity.

It uses advanced and patented airflow measurement based on the combination of the blade opening and the pressure difference between the blades.

  • Variable (VAV) and constant (CAV) airflow control applications
  • Supply and exhaust installations

Link to Revit object  (MagiCAD Cloud)

 

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Overview

Halton Max MOS is a rectangular airflow management damper that needs no safety distances. This airflow management damper is also designed to function at very low air velocity.

It uses advanced and patented airflow measurement based on the combination of the blade opening and the pressure difference between the blades.

Application areas

  • Variable (VAV) and constant (CAV) airflow control applications
  • Supply and exhaust installations

Key features

  • 0.5-8 m/s airflow velocity
  • Maximum differential pressure: 500 Pa over the damper
  • Can be connected to Building Management System (BMS)

Operating principle


Fig. 1. Halton Max MOS measuring pressure difference between blades.

Thanks to short (<330mm) and smooth damper casing and uniquely positioned walled measurement probes therein, the flow measurement is based on amplified pressure difference of the damper which enables accurate (±10%) and undisturbed flow control even at low flow velocity (≥0,5m/s).

It also enables challenging flow conditions without the need for in-duct structures, which would cause unnecessary initial pressure losses and challenges for damper cleaning or additional duct sections for safety distance (0-distance). These would cause high additional costs and challenge for damper positioning and installation in other dampers. Also, eventual cleaning of the measurement probes may be done with pressurized air outside of the unit without the need to access measurement tubes or damper blades inside the damper.

Depending on the selected airflow controller, it can receive the airflow control signal via

  • Modbus RTU network variable
  • BACnet MSTP network variable
  • An analog standard signal

The airflow setpoint can be modified between the minimum and maximum settings from the room controller interface or a BMS. The VAV controller can also send the actual value data back to the room interface controller. The communication protocol used for the signal between the room control interface and the VAV controller depends on the actuator model.

Key technical data

 Features  Description
Duct connection sizes 200×150 mm up to 800×400 mm
Material Galvanised steel or stainless steel (EN 1.4404/AISI 316L)
Air velocity range 0.5 – 8 m/s
Operating range (ambient temperature) 0-50℃
Ambient relative humidity (non-condensing) < 95%
Communication interface Modbus RTU, BACnet MST, analog
Accessories
  • Attenuator: several size and material options available
  • Reheat coil: models with or without internal heating controller available
Standards and certifications
  • Building material declaration, declaration of conformity
  • Casing tightness EN 1751 class C
  • Shut-off operation tightness fulfils EN 1751 class 3
Maintenance According to the building maintenance program

Features and options

Category Feature
(order code)
Option
(order code)
Description
Size Width of duct connection size
W
200, 250, 300, 400, 500, 600, 800 Seven nominal width sizes. Units are in millimetres.
Height of duct connection size
H
150, 200, 250, 300, 400 Five nominal height sizes. Units are in millimetres.
Options System package
SP
N No
Material
MA
GS Galvanised steel
AS Stainless steel (EN 1.4404/AISI 316L)
Insulation
IN
NA No insulation material on the damper body
I3 Damper body is insulated with 50 mm mineral wool (see Fig.2.)
Control unit
CU
EX Control unit with analog signal (0…10V or 2…10V)
EY Control unit with Modbus RTU or BACnet MSTP
Sound attenuator, SA
(subproduct*)
Sound attenuator material
AT
W Mineral wool
P Polyester fibre
Reheater, RH
(subproduct*)
Model type
RT
E Electrical heater
W Water coil for heating or cooling
Control type, electrical
RE
NA Not assigned
1 Own room panel to adjust setpoint and measure temperature
2 On/off controller, need external controller to switch heater on or off
3 External 0-10V control signal to adjust heating element power
4 External PWM control signal to adjust heating element power
Control type, water
RW
NA Not assigned
H Coil for heating
C Coil for heating or cooling. Drip tray included.

* Ordered separately

 


Fig. 2. Halton Max MOS, insulated model (IN=I3).

Control units

A range of control units are available for various application needs.

The control unit includes an integrated dynamic differential pressure sensor. The pressure sensor has a low bypass airflow rate through the sensor element. Depending on the model, airflow rate limits are adjusted on site with a mobile application or a dial for manual adjustment.

Code Actuator Torque Damper size Communication interface Order code
EX Belimo 10 Nm 200 x 150 –
800 x 400
Analog
0..10V/2..10V
EX = NMVD3W- MP.1
(DC 0/2…10 V), 10 Nm
EY Belimo 10 Nm 200 x 150 –
800 x 400
Bus
Modbus RTU
BACnet MSTP
EY = NMVD3W- MOD.1
(Modbus RTU/ BACnet
MSTP), 10 Nm

 

Quick selection

The operable airflow range for the Halton Max MOS corresponds to the duct air velocities of 0.5-8 m/s.

Operating range [l/s]
Width [mm] 200 250 300 400 500 600 800
Height
[mm]
150 15-240 19-300 23-360 30-480 28-600 45-720
200 20-320 25-400 30-480 40-640 50-800 60-960 80-1280
250 31-500 38-600 50-800 63-1000 75-1200 100-1600
300 45-720 60-960 75-1200 90-1440 120-1920
400 80-1280 100-1600 120-1920 160-2560

Table 1. Operating range, min – max [l/s]

Operating range [m3/h]
Width [mm] 200 250 300 400 500 600 800
Height
[mm]
150 54-864 68-1080 81-1296 108-1728 135-2160 162-2592
200 72-1152 90-1440 108-1728 144-2304 180-2880 216-3456 288-4608
250 113-1800 135-2160 180-2880 225-3600 270-4320 360-5760
300 162-2592 216-3456 270-4320 324-5184 432-6912
400 288-4608 360-5760 432-6912 576-9216

Table 2. Operating range, min – max [m3/h]

Stucture and materials


Fig. 3. Structure of Halton Max MOS

No. Part Description Note
1 Casing Galvanised steel Stainless steel (EN 1.4404/AISI 316L) also available.
2 Measurement probe Polyurethane
3 Blade Galvanised steel Sandwich design. Stainless steel (EN 1.4404/AISI 316L) also available.
4 Blade gasket Silicone Heat-proof model: LTE silicone
5 Blades end gasket Silicone
6 Measurement tube Silicone
7 Rectangular drive shaft Stainless steel (AISI 316L) 12×12 mm
8 Control unit Plastic, steel PVC cable
9 Tube connector Plastic POM
10 Gear sector Plastic

Dimensions and weight

Fig. 4. Dimensions of Halton Max MOS

 

Fig. 5. Dimensions of Halton Max MOS, insulated model

WxH
[mm]
Weight
[kg]
Weight, insulated
[kg]
200×150 4.0 6.4
200×200 4.4 7.0
250×150 5.4 8.1
250×200 4.7 7.6
250×250 5.1 8.3
300×150 4.8 7.6
300×200 5.2 8.3
300×250 5.7 9.0
300×300 6.3 9.9
400×150 5.5 8.7
400×200 6.0 9.4
400×250 6.5 10.2
400×300 7.4 11.4
400×400 8.4 13.0
500×150 6.2 9.9
500×200 6.8 10.6
500×250 7.3 11.5
500×300 8.3 12.8
500×400 9.5 14.5
600×150 6.8 11.0
600×200 7.4 11.7
600×250 8.0 12.6
600×300 9.0 13.9
600×400 10.2 15.7
800×200 9.3 14.5
800×250 9.9 15.4
800×300 11.3 17.0
800×400 12.9 19.1

Specification

Rectangular pressure-independent variable multiblade airflow control damper for supply and exhaust installations, fulfilling the following requirements:

Construction

  • Short (<330mm) and smooth damper casing and uniquely positioned walled measurement probes therein.
  • The flow measurement is based on amplified pressure difference of the damper. Accurate (±10%) and undisturbed flow control even at low flow velocity (≥0,5m/s) and challenging flow conditions. Control range at least 1:15
  • Closed damper blade air leakage according to EN 1751 class 3.
  • Casing air leakage according to EN 1751 class C.
  • No internal structures that would cause unnecessary initial pressure losses and challenges for damper cleaning. Eventual cleaning of the measurement probes to be done with pressurized air outside of the unit without the need to access measurement tubes/vanes or damper blades inside the damper.
  • No need to install additional duct sections for safety distance (zero safety distance).

Material

  • Galvanised or stainless steel (EN 1.4404, AISI 316L)

Electrical data

  • Modbus RTU, BACnet MSTP, or analogue connection
  • Control signal range of analogue control mode is for input 0…10 VDC or 2 …10 VDC
  • Feedback signal range of analogue control mode for output follows the selected control signal range 0…10 VDC
  • Power supply voltage 24 V DC/AC

Parameter settings

  • Designed airflow range can be set at the factory.
  • Controller settings are adjustable on site with bus communication or external service tool.

Accessories

  • Sound attenuator for noise reduction. Model with access panel available for easy maintenance.
  • Electric reheat coil with an internal heating controller.
  • Water coil for heating and cooling

Order code

Main options
W = Width of duct connection [mm] 200, 250, 300, 400, 500, 600, 800
H = Height of duct connection [mm] 150, 200, 250, 300, 400
Other options and accessories
SP = System package
N No
MA = Material
GS Galvanised steel
AS Stainless steel (EN 1.4404/AISI 316L)
IN = Insulation
NA Not assigned
I3 Insulated, 50 mm
CU = Control unit
EX NMV-D3W-MP.1 (DC 0/2…10V), 10 Nm
EY NMV-D3W-MOD.1 (Modbus RTU/BACnet MSTP), 10 Nm
ZT = Tailored product
N No
Y Yes (ETO)
Sub products and accessories (ordered separately)
SA Sound attenuator
RH Reheat coil

Order code example

MOS-400-200; SP=N, MA=GS, IN=NA, CU=EX, ZT=NA

Installation

The Halton Max MOS airflow control damper can be installed to T-branch and curve, without safety distances. The accuracy of the measured airflow is given in a table below. Install the unit into the ductwork in such a way that the airflow direction through the unit is as indicated with the arrow label in the unit casing.


Fig. 6. Example of Halton Max MOS installed to duct with no safety distances

Technical performance

  • Velocity range 0.5﹣8.0 m/s
  • General Measurement Uncertainty
    • Accuracy ±10%
    • The minimum allowed safety distance is 0xD.

Note: The measurement uncertainty is defined in laboratory conditions and may be greater in practical installations, where non-optimal installation situations or multiple consequent disturbances may exist.

Wiring

The wiring must only be carried out by qualified personnel following the local regulations. For the power supply, a safety isolating transformer must be used.

The bus must be implemented according to standard EIA/TIA-485.

Fig. 6. Example: General RS-485 2-wire Topology

For connection and wiring diagrams, see Controller connections and Wiring diagrams in Technical reference data.

Cabling requirements

Field devices:

  • The wires connected to the terminals have a cross-sectional area of at least 0.5 mm2.
  • Twisted-pair cables, shielding recommended.

Modbus RTU or BACnet MSTP cable:

  • Shielding twisted-pair. For example, Belden 3105A or Nomak 2x2x0.5+0.5.
  • Max. bus length 1000 m.
  • To avoid signal reflections, a 120 Ohm termination resistance must be added at the end of the main cable line.

Commissioning

Airflow control

The airflow rates for the Halton Max MOS are preset at the factory. If the airflow rates are not specified by the customer, the default factory settings are 0 for the minimum airflow rate and the nominal value (Vnom) for the maximum rate.

The nominal airflow rates in the following table are given with a pressure level of 200 Pa.

Vnom [l/s]
Width [mm] 200 250 300 400 500 600 800
Height
[mm]
150 300 375 450 600 750 900
200 400 500 600 800 1000 1200 1600
250 625 750 1000 1250 150 2000
300 900 1200 1500 1800 2400
400 1600 200 2400 3200

Table 3. Vnom [l/s]

Vnom [m3/h]
Width [mm] 200 250 300 400 500 600 800
Height
[mm]
150 1080 1350 1620 2160 2700 3240
200 1440 1800 2160 2880 3600 4320 5760
250 2250 2700 3600 4500 5400 7200
300 3240 4320 5400 6480 8640
400 5760 7200 8640 11520

Table 4. Vnom [m3/h]

The actual airflow rate is calculated as a function of different of differential pressure at the measurement probe, blade opening angle and the correct size k factor.

Maintenance

The product is easy to maintain. Normally, the electrical parts do not need maintenance. It is recommended to clean the internal parts of the product when cleaning the ductwork. Refer to the building maintenance program for the maintenance cycle.

Design examples

Office room design example

Description

Office environments place high demands on the ventilation and air quality. Halton Max MOS is perfect for air management in spaces where wide airflow ranges are needed. Silent ventilation system guarantees good working conditions. Minimum maintenance needs prevent creating disturbances in the daily activities.

Design data

  • Office/meeting room area 14 m2
  • Room minimum airflow 30 l/s
  • Room maximum airflow 60 l/s
  • Cooling load 500W, 36W/m2


Fig. 7. Halton Max MOS performance

 

Ventilation design


Fig. 8. Halton Max MOS ventilation design

Components

  • MOS with attenuator 600 length
  • AGC-500-100
  • PRL/F-500-100-200
  • 2 x JDS/S-160

Schematic drawing


Fig. 9.Wiring example for Halton Max MOS with a master-slave configuration

In this example, the supply unit is controlling the exhaust unit.

Accessories

Reheat coils (RH)


Fig. 10. Rectangular duct heater, electrical

Halton offers two models of reheater for ducts:

  • Water heater/cooler coils are designed for cooling the ventilation air in a ventilation system. The reheater/cooler can also be used for heating or cooling individual rooms or zones.
  • Electrical heaters, circular and rectangular, are designed to heat fresh air in a ventilation system.

For more information on the available reheat coils, see section Downloads.

 

Sound attenuators (SA)


Fig. 11. Rectangular sound attenuator

Halton offers high-quality rectangular and circular sound attenuators for reducing noise levels in the duct.

For more information on the available sound attenuators, see section Downloads.

Downloads

  • NEW! Halton Max MOS – Airflow management damper (VAV)

    Data

    en

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  • Halton Max MOS – Fiche technique

    Data

    Français (fr)
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  • Halton SA, sound attenuator – Technical description

    Data

    English (en)
    Shape 2
  • Halton RH, electrical duct heater – Technical description

    Data

    English (en)
    Shape 2
  • Halton RH, reheat coil with water – Technical description

    Data

    English (en)
    Shape 2
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