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Halton Max MLC – Airflow management damper

The Halton Max MLC airflow management damper can be installed without safety distances in all installation cases!

It can operate either in duct static pressure control mode or duct airflow control mode depending on chosen control unit. The airflow management damper is designed to function also at very low air velocity and pressure.

The Halton Max MLC airflow management damper is particularly suitable for demand-based office applications.

  • Air velocity range 0,5 — 6 m/s
  • Shut-off operation tightness fulfils EN 1751 class 4
  • Pressure-independent operation

Link to Revit model (MagiCAD Cloud)

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Overview

The Halton Max MLC airflow management damper can be installed without safety distances in all installation cases. It can operate either in duct static pressure control mode or duct airflow control mode depending on chosen control unit. The airflow management damper is designed to function also at very low air velocity and pressure.

Applications

  • For demanding and flexible office space requirements as minimal need of safety distance
  • Supply and exhaust installations

Key features

  • Air velocity range 0,5 — 6 m/s
  • Airflow is measured with calibrated orifice plate
  • Pressure-independent operation
  • Duct static pressure control and airflow rate control modes are available
  • For duct static pressure control used with the Halton MSS
  • Insensitive to dust collection in ductwork
  • Project specific settings are preset at the factory
  • Wide range of control units available (analog, Modbus, BACnet/IP, LON,…).
  • Can be connected to Buildings Management System (BMS)

Standards

  • Casing tightness EN 1751 class C
  • Shut-off operation tightness fulfils EN 1751 class 4

Operating principle

Fig.1. Halton Max MLC, airflow direction  

The damper contains airflow measurement with orifice plate, a VAV airflow controller, an actuator and a blade with gasket. Depending on the actuator model, the VAV controller is a separate unit or integrated into the actuator.

The damper can operate either as a supply or an exhaust unit. It maintains the required airflow level or pressure level through static pressure measurement. For ductwork static pressure control, static pressure measurement unit (MSS) with pressure transmitter is used for zone ductwork static pressure measurement.

Changes in room conditions can be adjusted manually from an end-user interface or by different sensors such as occupancy or room pressure sensors, thermostats or timers. The conditions can also be managed remotely from a building management system (BMS). The control signal and the airflow measurement data from the pickup tubes are processed in the VAV controller. The VAV controller gives the actuator a command to change the position of the damper blade, in order to keep the airflow at the predefined setpoint.

The airflow setpoint can be modified between minimum and maximum settings from the room controller interface or a BMS. The VAV controller can also send 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.

For more information about the available actuator models, see section Control units.

Key technical data

Feature Value
Duct connection sizes ø125-500 mm
Material Galvanised steel
Air velocity range
  • 0.5 – 6 m/s for airflow control
  • 0.5 – 5 m/s for static pressure control (up to 4 m/s for most optimal operation)
Operating range (ambient temperature) 0-50 ℃
Ambient relative humidity (non-condensing) < 95%
Operating modes

  • Static pressure control
  • Airflow control
  • Complete shut off function
  • Maximum differential pressure over the damper 500 Pa
  • Static pressure setpoint range 40 to 200 Pa in static pressure control mode
Accessories
  • Insulation 50 mm mineral wool for air radiated sound and condensation purposes
Standards and certifications
  • Building material declaration, declaration of conformity
  • Casing tightness EN 1751 class C
  • Shut-off operation tightness fulfils EN 1751 class 4

Quick selection

The operable airflow range for Halton Max MLC corresponds to duct air velocities 0.5-6 m/s.

The below example shows the airflow ranges and noise levels with damper blade fully open.

Structure and materials

No. Part Material
1 Blade gasket EPDM rubber
2 Shaft Galvanised steel
3 Blade Galvanised steel
4 Duct seal gasket Rubber
5 Control unit Plastic, steel, PVC cable
6 Casing Galvanised steel
7 Orifice plate gasket EPDM rubber
8 Orifice plate Galvanised steel
9 Tube connectors Polyacetal
10 Measurement tabs Polyurethane

Control units

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

All control units include an integrated dynamic differential pressure sensor with a low bypass airflow rate through the sensor element. Therefore not to be used in highly contaminated environments. Airflow rate limits are set at the factory.

Controller Notes Torque
Nm
Damper
size
Communication
interface
Order code
Halton
EM
Analogue controller
Manufacturer:
Belimo
5 100-250 DC0..10V/
2..10V
EM =
LMV-D3-MF-F.1 HI (DC 0/2…10 V), 5 Nm
Halton
EK
Analogue controller
Manufacturer:
Belimo
10 100-500 DC0..10V/
2..10V
 EK =
NMV-D3-MF-F.1 HI (DC 0/2…10 V), 10 Nm
Halton
EC
Controller with NFC
connectivity for mobile
onsite parameter adjustment
(Belimo Assistant App).
Analogue or MPbus.
Manufacturer: Belimo
5 100-250 Belimo MP bus
or 0..10V/2..10V
EC = LMV-D3-MP (MP bus), 5 Nm
Halton
EE
Controller with NFC
connectivity for mobile
onsite parameter adjustment
(Belimo Assistant App).
Analogue or MPbus.
Manufacturer: Belimo
10 100-500 Belimo MP bus
or 0..10V/2..10V
EE = NMV-D3-MP (MP bus), 10 Nm
Halton
ER
Controller with
KNX
Manufacturer:
Belimo
5 100-250  KNX ER =
LMV-D3-KNX (KNX bus), 5 Nm
Halton
ES
Controller with
KNX
Manufacturer:
Belimo
10 100-500  KNX ES =
NMV-D3-KNX (KNX bus), 10 Nm
Halton
ET
Controller with
Modbus
Manufacturer:
Belimo
5 100-250  Modbus ET =
LMV-D3-MOD (Modbus RTU), 5 Nm
Halton
EU
Controller with
Modbus
Manufacturer:
Belimo
10 100-500  Modbus EU = NMV-D3-MOD (Modbus RTU), 10 Nm
Halton
EH
Analogue controller
Manufacturer:
Siemens
5 100-250 DC0..10V/
2..10V
EH = GDB181.1E/3 (DC 0/2…10 V), 5 Nm
Halton
EG
Analogue controller
Manufacturer:
Siemens
10 100-500 DC0..10V/
2..10V
EG =
GLB181.1E/3 (DC 0/2…10V), 10 Nm
Halton
EV
Controller with
KNX
Manufacturer:
Siemens
5 100-250 KNX
communication
EV =
GDB181.1E/KN (KNX bus), 5 Nm
Halton
V1
Analogue controller
Manufacturer:
Belimo
5 100-250 DC0..10V/
2..10V
V1 =
LM24A-VST, (DC 0/2…10 V), 5 Nm+VRU-D3-BAC
Halton
V2
Analogue controller
Manufacturer:
Belimo
10 100-500 DC0..10V/
2..10V
V2 =
NMQ24A-VST,  (DC 0/2…10 V), 10 Nm + VRU-D3-BAC
Halton
V3
Analogue controller
Manufacturer:
Belimo
4 100-250 DC0..10V/
2..10V
V3 =
LMQ24A-VST, 2.5 sec (DC 0/2…10 V), 4 Nm + VRU-D3-BAC
Halton
V4
Analogue controller
Manufacturer:
Belimo
8 100-500 DC0..10V/
2..10V
V4 =
NMQ24A-VST, 4 sec (DC 0/2…10 V), 8 Nm + VRU-D3-BAC
Halton
EW
Actuator with
KNX
Manufacturer:
Siemens
10 100-500 KNX
communication
EW =
GLB181.1E/KN (KNX bus), 10 Nm
Halton
EB
Actuator with
Modbus RTU (RS-485)
Manufacturer:
Siemens
5 100-250 Modbus communication EB = GDB181.1E/MO (Modbus RTU), 5 Nm
Halton
EF
Actuator with
Modbus RTU (RS-485)
Manufacturer:
Siemens
10 100-500 Modbus communication EF = GLB181.1E/MO (Modbus RTU), 10 Nm
Halton
HM
Controller include actuator with
LonWorks
Manufacturer:
Distech
5 100-250 LonWorks communication HM = ECL-VAV-S, HAV (LonWorks), 5Nm
Halton
HK
Modulating actuator from Belimo:
Controller
LonWorks
Manufacturer:
Distech
10 100-500 LonWorks communication HK = ECL-VAV-N, HAV + NM24A-SR (LonWorks), 10 Nm

Dimensions and weight

Model without insulation

NS
[mm]
⌀D
[mm]
L
[mm]
L1
[mm]
L2
[mm]
L3
[mm]
H
[mm]
Weight
[kg]
125 124 329 257 184 134 2.3
160 159 329 257 219 169 2.6
200 199 494 422 15 259 209 3.3
250 249 494 422 38 309 259 3.9
315 314 494 422 70 374 324
400 399 620 545 115 459 409
500 499 620 545 95 559 509

Model with insulation (50 mm)

NS
[mm]
⌀D
[mm]
L
[mm]
L1
[mm]
L2
[mm]
L4
[mm]
H
[mm]
Weight
[kg]
125 124 329 257 305 225 2.7
160 159 329 257 340 260 3.6
200 199 494 422 15 380 300 4.4
250 249 494 422 38 430 350 5.3
315 314 494 422 70 495 415
400 399 620 545 115 580 500
500 499 620 545 95 680 600

Specification

The pressure-independent variable airflow management damper is made of galvanised steel, airflow measurement with orifice plate.

Duct connection shall include integral airtight rubber gaskets.

The management damper shall contain airflow measurement, flow controller and damper actuator.

It can operate either in duct static pressure control mode or duct airflow control mode.

The airflow management damper can be installed without safety distances.

Construction

  • Damper includes airflow measurement with orifice plate and damper control unit.
  • Duct connection includes integral airtight rubber gaskets.
  • Damper with blade gasket: the tightness of the control damper in closed position conforms to standard EN1751 class 4 and casing tightness to EN 1751 class C.
  • Damper with optional external insulation include a 50 mm mineral wool insulation layer
  • Closing blade with gasket ensure complete shut-off function

Material

  • Galvanised steel

Parameter settings

  • Project specific parameters are preset at the factory according to customer specific requirements.

Installation

Installation options

The Halton Max MLC airflow control damper can be installed without safety distances. Accuracy of the measured airflow is given in a table below. Install the unit into ductwork in such a way that the airflow direction through the unit is as indicated with the arrow label in the unit casing.

Space requirements

Disturbances in the ductwork such as duct bends, T-branches and sound attenuators cause turbulence and an uneven airflow. This can lead to fluctuation and inaccuracy in measurement values.

The space between airflow damper and above mentioned disturbance can be set to 0D. Picture below demonstrates what 0xD means (see Fig. 2.). The accuracy varies according airflow and unit size (see chapter below: Accuracy of measurement with different airflows)

Fig.2. Safety distance examples

Fig.3. Installation cases

Nr. Installation cases Safety distance
1. T-branch, side duct 0D
2. T-branch, main duct 0D
3. Reducer, < D 0D
4. Reducer, > D 0D
5. Bend, elbow 90° 0D

Table 1. Safety distances of Halton Max MLC

Accuracy of measurement with different airflows

Size Airflow [l/s] Airflow [m3/h] Accuracy of measurement
with 0D [%]
125 7 24.8 15
28 100 10
53 190 8
74 266 5
160 10 36 15
40 145 10
81 290 8
121 434 5
200 16 56.5 15
63 226 10
126 452 8
188 678 5
250 25 90 15
98 354 10
197 710 8
294 1060 5
315 39 140 15
153 562 10
312 1123 8
468 1685 5
400 63 227 15
251 904 10
503 1811 8
754 2714 5
500 98 353 15
393 1415 10
785 2826 8
1178 4241 5

Pressure control

In pressure control operation, the recommended safety distance between Halton Max MLC airflow damper and Halton MSS measuring unit is min. 5D (Fig.4.)

Fig.4. Halton Max MLC and Halton MSS, safety distance min. 5D

Commissioning

Airflow control

Airflow rate ranges of the Halton Max MLC are presented in the table below. The airflow rate range is valid both for pressure and airflow control applications.

NS
[mm]
l/s min
@ 0.5 m/s
l/s max
@ 6 m/s
m3/h min
@ 0.5 m/s
m3/h max
@ 6 m/s
125 6,9 74.0 24.8 266.0
160 10.0 121.0 36.0 434.0
200 15.9 188.4 56.5 678.0
250 25.0 294.4 90.0 1060.0
315 39.0 468.0 140.0 1683.0
400 63.0 754.0 226.0 2714.0
500 98.0 1178.0 353.0 4241.0

The actual airflow rate can be calculated as a function of differential pressure at the Halton Max MLC measurement probe and the measurement probe k factor. The proper k factor can be found in an attachment for the product.

K_factor

qv        Actual airflow rate [l/s] or [m3/h]
Δpm   Differential pressure of measurement probe [Pa]
k          k factor (see table below)

NS [mm] k factor [l/s] k factor [m3/h]
125 7.5 27.0
160 11.3 40.6
200 21.7 78.0
250 27.7 99.7
315 35.8 128.9
400 50.2 180.7
500 101.8 366.5

Duct pressure control

The actual measured static pressure can be read from the LED display of the Halton MSS static pressure measurement unit with pressure transmitter. Pressure values can be read as network variables.

Accessories

Duct sensor (DS1 = CO2G, Duct CO2)

The transmitter designed to be installed in HVAC return air ducts. The size of the board and the dimensions of the case have been optimized to place the transmitter in small, i.e. 160 mm diameter, return air ducts. This product offers a sleek design, a simple analog output, and it is easy to install. The transmitter includes mounting hardware and installation instructions.

More information: Link to manufacture’s datasheet

Differential pressure transmitter (P1 = HDP-PE)

The Halton HDP-PE differential pressure sensor is a pressure-measuring device, used to measure differential pressures in the duct. It gives an accurate measurement of the airflow. The influence of process disturbances can be filtered by increasing the time constant.

More information: Link to manufacture’s datasheet

Transformer (TF1 = 230/24 transformer (35VA)

Transmitter 35 VA for DIN rail installation.

More information: Link to manufacture’s datasheet

Order code

MLC/S-D, MA-CU-SE-TF-ZT

Main options
S = Model
G Damper with blade gasket
I Damper with blade gasket, insulation 50 mm
D = Duct connection size [mm] 125, 160, 200, 250, 315, 400, 500
Other options and accessories
MA = Material
GS Galvanised steel
CU = Control unit
EM LMV-D3-MF-F.1 HI (DC 0/2…10 V), 5 Nm
EK NMV-D3-MF-F.1 HI (DC 0/2…10 V), 10 Nm
EC LMV-D3-MP (MP bus), 5 Nm
EE NMV-D3-MP (MP bus), 10 Nm
ER LMV-D3-KNX (KNX bus), 5 Nm
ES NMV-D3-KNX (KNX bus), 10 Nm
ET LMV-D3-MOD (Modbus RTU), 5 Nm
EU NMV-D3-MOD (Modbus RTU), 10 Nm
EH GDB181.1E/3 (DC 0/2…10 V), 5 Nm
EG GLB181.1E/3 (DC 0/2…10V), 10 Nm
EV GDB181.1E/KN (KNX bus), 5 Nm
EW GLB181.1E/KN (KNX bus), 10 Nm
EB GDB181.1E/MO (Modbus RTU), 5 Nm
EF GLB181.1E/MO (Modbus RTU), 10 Nm
V1 LM24A-VST, (DC 0/2…10 V), 5 Nm+VRU-D3-BAC
V2 NM24A-VST, (DC 0/2…10 V), 10Nm+VRU-D3-BAC
V3 LMQ24A-VST, 2.5 sec (DC 0/2…10 V), 4 Nm+VRU-D3-BAC
V4 NMQ24A-VST, 4 sec (DC 0/2…10 V), 8 Nm+VRU-D3-BAC
HM ECL-VAV-S, HAV (LonWorks), 5Nm
HK ECL-VAV-N, HAV + NM24A-SR (LonWorks), 10 Nm
SE = Sensors
NA Not assigned
DS1 Duct sensor (CO2G, Duct CO2)
P1 Differential pressure transmitter (HDP-PE)
TF = Transformer
NA Not assigned
TF1 230/24 transformer (35VA)
ZT = Tailored product
N No
Y Yes (ETO)

Order code example

MLC/G-160, MA=GS, CU=ER, SE=P1, TF=NA, ZT=N

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