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Circular airflow management damper
Circular airflow management damper

Halton Max Flex Circular (MFC) – Airflow management damper

Terminated as of 1st March 2021
-> replaced with Halton Max One Circular (MOC)

Circular airflow management damper for standard VAV applications. Easy and convenient adjustment of airflow rate limits on site with a mobile application or a dial [manual adjustment].

In the product development phase of Halton Max Flex, special attention has been put to preventing dirt from affecting the measurement, thus prolonging the product lifetime.

Materials and components are proven to meet demanding longterm requirements. The high-precision pick up tubes are engineered for sensitivity in low airflows and low noise generation in high airflows.

Overview

Terminated as of 1st March 2021
– replaced with Halton Max One Circular (MOC)

Circular airflow management damper for standard VAV applications. Easy and convenient adjustment of airflow rate limits on site with a mobile application or a dial.

  • Averaging cross measurement tubes, actuators adjustable on site, 1-10 m/s airflow velocity
  • Suitable for both supply and exhaust installations

Product models and options

  • Models with blade gasket (EN 1751, class 4 tightness) and/or external insulation available
  • Several connection sizes between 100-630 mm
  • Galvanised steel and stainless steel (EN 1.4404, AISI 316L) as material options
  • Several actuator options
  • Sound attenuators and reheat coils available as accessory

Other product characteristics

  • Maximum differential pressure: 1000 Pa over the damper
  • Operating range: ambient temperature of 0-50 ºC
  • Ambient relative humidity: < 95%, non-condensing

Related products and solutions: Halton Max One Circular (MOC)

Product Models

The Halton Max Flex Circular airflow control dampers are available in four product models:
G, H, I and J:

  • Product models G and I include a blade gasket for airtight shut-off operation.
  • Product models I and J include a 50 mm insulation for sound attenuation.
 Feature Product
model
G
Product
model
H
Product
model
I
Product
model
J
 Blade gasket x x
 50 mm
external insulation
x x
 Tightness EN 1751,
class C and class 4
x x
 Tightness EN 1751,
class C
x x
 Minimum torque 5 Nm Sizes
100-250
Sizes
100-630
Sizes
100-250
Sizes
100-630
 Minimum torque 10 Nm Sizes
315-630
Sizes
315-630
 Complete shut-off function x x

Quick Selection

Airflow ranges for Halton Max Flex Circular with an air velocity of 1-10 m/s.
Applies to dampers with blade gasket (models G and I).

NS (mm) qv
min-max (l/s)
qv
min-max (m3/h)
100 8 – 79 28 – 283
125 12 – 123 44 – 442
160 20 – 201 72 – 724
200 31 – 314 113 – 1131
250 49 – 491 177 – 1767
315 78 – 779 281 – 2806
400 126 – 1257 452 – 4524
500 296 – 1964 707 – 7069
630 312 – 3117 1122 – 11222

Airflow ranges for Halton Max Flex Circular with an air velocity of 2-10 m/s.
Applies to models without blade gasket (models H and J).

NS (mm) qv
min-max (l/s)
qv
min-max (m3/h)
100 16 – 79 57 – 283
125 25 – 123 88 – 442
160 40 – 201 145 – 724
200 63 – 314 226 – 1131
250 98 – 491 353 – 1767
315 156 – 779 561 – 2806
400 251 – 1257 905 – 4524
500 393 – 1964 1414 – 7069
630 623 – 3117 2244 – 11222

Material

 Part  Material option:
Galvanised steel
(order code MA=CS)
 Material option:
Stainless steel
(order code MA=AS)
 Casing  Galvanised steel  Stainless steel
(EN 1.4404/AISI 316L)
 Damper blade  Galvanised steel  Stainless steel
(EN 1.4404/AISI 316L)
 Shaft  Galvanised steel  Stainless steel
 Blade gasket
(models G and I)
 EPDM Rubber  EPDM Rubber
 Duct gaskets
(vulcanised to the casing)
 1C-polyurethane hybrid  1C-polyurethane hybrid
 Measurement probe  Aluminium  Stainless steel
 External insulation
(models I and J)
 Mineral wool  Mineral wool
 Measurement tubes  PU plastic  PU plastic


Fig.1. Halton Max Flex Circular, stainless steel model (EN 1.4404/AISI 316L )

Actuators

A range of actuators are available for various application needs.

All actuators include 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.

Actuator  Notes Torque
Nm
Damper
size
 Communication
interface
 Order code
Halton
EC
 Actuator 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-F.1 HI
Halton
EE
 Actuator with NFC
connectivity for mobile
onsite parameter adjustment
(Belimo Assistant App).
Analogue or MPbus.
Manufacturer: Belimo
10 315-630  Belimo MP bus
or 0..10V/2..10V
 EE=
NMV-D3-MP-F.1 HI
Halton
EO
 Rotary actuator
with screwdriver dial for
onsite parameter adjustment.
Analogue or Modbus.
Manufacturer: Grüner
5 100-250  Modbus
or 0..10V/2..10V
 EO=
227VMZ-024-05-MByEx
Halton
EP
 Rotary actuator
with screwdriver dial for
onsite parameter adjustment.
Analogue or Modbus.
Manufacturer: Grüner
10 315-630  Modbus
or 0..10V/2..10V
 EP=
227VMZ-024-10-MByEx

Dimensions

Halton Max Flex Circular, models G and H (non insulated)

NS D L L1 L2 H
100 99 248 176 82 110
125 124 248 176 82 135
160 159 331 259 82 170
200 199 331 259 82 210
250 249 331 259 82 260
315 314 331 259 82 325
400 399 500 428 82 410
500 499 630 558 149 508
630 629 630 558 149 638

Halton Max Flex Circular, models I and J (insulated)

NS D L L1 L2 H1
100 99 248 176 82 200
125 124 248 176 82 225
160 159 331 259 82 260
200 199 331 259 82 300
250 249 331 259 82 350
315 314 331 259 82 415
400 399 500 428 82 500
500 499 630 558 149 600
630 629 630 558 149 730

Function

Key
1.    Damper
2.    Airflow direction
3.    Measurement probe
4.    VAV airflow controller
5.    Actuator
6.    Blade

The damper contains a cross-type airflow measurement probe, a VAV airflow controller, an actuator and a blade (with or without gasket). Depending on the actuator model, the VAV controller is a separate unit or integrated into the actuator.

The damper can function either as a supply or an exhaust unit. It maintains the required airflow through accurate measurement and airflow control, regardless of variations in the room conditions or duct pressure.The airflow measurement is based on a differential pressure generated by high-precision pickup tubes of the measurement probe. The tubes are engineered for sensitivity in low airflows and for low noise generation in high airflows.

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 Actuators.

Installation

Safety distances

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.

In order to ensure the accuracy of the airflow measurement, the minimum safety distances between the measuring unit and airflow disturbances must be respected.

For airflow control applications, the minimum safety distance is 1xD after an elbow bend and 3xD for T-branches. The safety distance between the damper and a sound attenuator is 2xD.

Install the unit into the ductwork so that the safety distances and direction of the airflow are as indicated in the following figures. Please refer to project-specific job drawings for more details.

Fig.1.  Bend (90° elbow)


Fig.2.  T-branch


Fig.3.  With sound attenuator

Space requirements

Sufficient space must be reserved to allow access to accessories during commissioning and maintenance.

Wiring

The wiring must be carried out by professional technicians in accordance with local regulations. For the power supply, a safety-isolating transformer must be used.

The responsibilities between Halton and 3rd party are specified in the following example wiring diagram for a typical variable airflow control application:

Key
1     (G0) 24 VAC system neutral
2     (~) 24 VAC live
3     (w) 2…10- or 0…10-VDC airflow setpoint signal input
5     (U5) 2…10- or 0…10-VDC airflow feedback signal output

Commissioning

Airflow control

The airflow rate limits for Halton Max Flex Circular are adjusted on site with a mobile application or a dial, depending on actuator model

The nominal airflow rates in the following table are given with a pressure level of 150 Pa. Applies to Halton Max Flex Circular EC and EE actuators.

Vnom (l/s)
@ 150 Pa
Vnom (m3/h)
@ 150 Pa
100 78 282
125
123
441
160
221
794
200 353 1270
250 574 2068
315 881 3170
400 1484 5344
500 2387 8593
630 3895 14021

The nominal airflow rates for Halton Max Flex Circular dampers with the Halton EO and EP actuators are given for a pressure level of 250 Pa.

Vnom (l/s)
@ 250 Pa
Vnom (m3/h)
@ 250 Pa
100 101 364
125
158
569
160
285
1025
200 455 1639
250 742 2670
315 1137 4092
400 1916 6899
500 3082 11094
630 5028 18101

The actual airflow rate is calculated as a function of differential pressure at the measurement probe and the measurement probe k factor.

where

  • qv           Actual airflow rate [l/s]
  • k             k factor
  • Δpm        Differential pressure of measurement probe [Pa]

The actuators are equipped with a pressure sensor, and there is a very low airflow through the differential pressure sensor of the controller. Therefore, a manual differential measurement manometer can be connected in parallel to the airflow controller (for example with tube T-branches) and both measurements can operate in parallel with continuous control.
The k factors for the different sizes are listetd in the following table:

NS k factor (l/s)
100
6.4
125
10.0
160
18.0
200
28.8
250 46.9
315 71.9
400 121.2
500 194.9
630 318.0

Sound Attenuators

Description

Halton offers high-quality rectangular sound attenuators with round duct connection for reducing noise levels in the duct. Sound attenuators are available as accessory and the following options are available:

  • Three lengths: 600, 1000 and 1250 mm
  • Connection types
    • D2=D1
      The duct (D2) and damper (D1) connections are the same size
    • D2>D1
      The duct connection (D2) is one size larger than the damper (D1) connection
  • Insulation material options:
    • Polyester fibre (PEF), tested according to ISO 7235, class C tightness level
    • Mineral wool (MW), class C tightness level
  • Available with or without access panel for maintanance purposes

Technical data

D1 is connected directly to the damper with female-type connection. D2 is attached to the duct with male-type connection. The above picture depicts supply air installations. In exhaust installations, the airflow direction is from D2 to D1. The damper is always connected to D1.

Dimensions (mm) and weights

Key

  • MW    Mineral wool
  • PEF   Polyester fibre

Examples of attenuation data:


Fig.1.  Attenuation data, L = 600 mm, material = PEF


Fig.2.  Attenuation data, L = 1000 mm, material = PEF

For further information, contact Halton sales.

Order code

SA = choose model code from clumn Code, H1 – H18.

Code Length (mm) Connection type Insulation material Access panel
H1 600 D2=D1 MW No
H2 1000/1250* D2=D1 MW No
H3 600 D2=D1 PEF No
H4 1000/1250* D2=D1 PEF No
H5 600 D2>D1 MW No
H6 1000/1250* D2>D1 MW No
H7 600 D2>D1 PEF No
H8 1000/1250* D2>D1 PEF No
H11 600 D2=D1 MW Yes
H12 1000/1250* D2=D1 MW Yes
H13 600 D2=D1 PEF Yes
H14 1000/1250* D2=D1 PEF Yes
H15 600 D2>D1 MW Yes
H16 1000/1250* D2>D1 MW Yes
H17 600 D2>D1 PEF Yes
H18 1000/1250* D2>D1 PEF Yes

Key

  • D1        Damper connection
  • D2        Duct connection
  • MW      Mineral wool
  • PEF     Polyester fibre
  • *           For sizes ⌀D 400 or 500. See Dimensions and Weight table.

Reheat Coils

Description

Reheat coils are available as accessory. Main features:

  • Product models:
    • Model RM
      Without internal heating controller, PWM control signal input
    • Model RC
      With internal heating controller, 0…10-VAC control signal input. Built-in alarm relay with potential-free changeover contact for remote alarm monitoring. The alarm is triggered by manual overheating protection or heater power loss.
  • Sinlge-phase heater with 230 VAC, less than 16 A
  • Increased heater safety with two internal overheating protection devices (automatic and manual), connected in series.
  • EN 15727 class C tightness level
  • Available for duct sizes 100 – 400 mm
  • Power 600 – 3000 W

Technical data

Key
D   100, 125, 160, 200, 250, 315, 400 mm
1    Resetting of manual overheating protection

The heater can be installed in vertical or horizontal ducts. The safety distance is 2xD.

The heater must always be interlocked towards the fan or towards the airflow going through the heater. The interlocking function is connected to the duct heater power supply or, if the heater has an internal heating controller (model RC), it can also be connected directly to the controller.

The power supply to the duct heater must be switched off when the fan is switched off or when the airflow rate is too low.

When selecting the airflow control damper and reheat coil, ensure that the airflow velocity is above 2 m/s in order to guarantee a proper control function.
Heating capacity with low air velocity of 2 m/s

NS Power (W) qv l/s qv m3/h dT(max) K
100 600 16 57 32
125 900 25 88 31
160 1500 40 145 31
200 2100 63 226 28
250 3000 98 353 25
315 3000 156 561 16
400 3000 251 905 10

Heating capacity with an air velocity of 6 m/s

NS Power (W) qv l/s m3/h dT(max) K
100 600 47 170 11
125 900 74 265 10
160 1500 121 434 10
200 2100 188 679 9
250 3000 295 1060 8
315 3000 468 1683 5
400 3000 754 2714 3

For further information,  contact Halton Sales.

Order Code

RH=RM or RH=RC

Specification

Pressure-independent variable airflow control damper for supply and exhaust installations.

Construction

  • Damper includes an airflow measurement probe, airflow controller and damper actuator.
  • 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/C.
  • Damper without blade gasket: the tightness of the control damper in closed position conforms to standard EN1751/C.
  • Damper with external insulation include a 50mm mineral wool or polyester fibre insulation layer.

Material

  • Galvanised steel, with an airflow measurement probe of aluminium
  • Stainless steel, with measurement probe of stainless steel (EN 1.4404/AISI 316L)

Electrical data

  • Digital bus and/or analogue connection available, depending on the actuator
  • Analogue airflow controller control signal input range is 0…10 VDC or 2 …10 VDC and output range 0…10 VDC for airflow feedback
  • Supply voltage 24 VAC

Parameter settings

  • Controller settings are adjustable on site with a mobile application or a dial

Accessories

  • Sound attenuator for noise reduction. An access panel can be added for easy maintenance.
  • Electric reheat coil with internal heating controller. Power supply 230 VAC, less than 16A. A safety overheat thermostat with both automatic and manual reset as well as an alarm relay with the possibility of remote alarm monitoring are incorporated in the heater. A room controller is required to control the duct heater with a 0…10 VDC control signal.
  • Electric reheat coil without internal heating controller. Power supply 230 VAC (pulse width modulation). A safety overheat thermostat with both automatic and manual reset is incorporated in the heater. A room controller required to control the duct heater with a 0…10 VDC control signal.

Order Code

MFC/S-D, MA-CU-FS-SA-RH-ZT

S = Model
G      With blade gasket
H      No blade gasket
I       With blade gasket and insulation (50 mm)
J       No blade gasket, with insulation (50 mm)

D = Connection size (mm)
100, 125, 160, 200, 250, 315, 400, 500, 630

Other Options and Accessories

MA  = Material
CS     Galvanised steel
AS     Stainless steel (EN 1,4404/AISI 316L)

CU  = Control unit
EC         LMV-D3-MP-F1 HI           (sizes 100-250)
EE         NMV-D3-MP-F1 HI           (sizes 315-630)
EO         227VMZ-024-05-MByEx   (sizes 100-250)
EP         227VMZ-024-10-MByEx   (sizes 315-630)

FS   = Factory-set airflow limits
DS         Default factory settings (Vnom)
DC         Customer specified settings

SA  = Sound attenuator (accessory)
NA       Not assigned
H1       L = 600 mm; Outlet = Inlet; Mineral wool
H2       L = 1000/1250 mm; Outlet = Inlet; Mineral wool
H3       L = 600 mm; Outlet = Inlet; Polyester fibre
H4       L = 1000/1250 mm; Outlet = Inlet; Polyester fibre
H5       L = 600 mm; Outlet > Inlet; Mineral wool
H6       L = 1000/1250 mm; Outlet > Inlet; Mineral wool
H7       L = 600 mm; Outlet > Inlet; Polyester fibre
H8       L = 1000/1250 mm; Outlet > Inlet; Polyester fibre
H11     L = 600 mm; Outlet = Inlet; Mineral wool; Access panel
H12     L = 1000/1250 mm; Outlet = Inlet; Mineral wool; Access panel
H13     L = 600 mm; Outlet = Inlet; Polyester fibre; Access panel
H14     L = 1000/1250 mm; Outlet = Inlet; Polyester fibre; Access panel
H15     L = 600 mm; Outlet > Inlet; Mineral wool; Access panel
H16     L = 1000/1250 mm; Outlet > Inlet; Mineral wool; Access panel
H17     L = 600 mm; Outlet > Inlet; Polyester fibre; Access panel
H18     L = 1000/1250 mm; Outlet > Inlet; Polyester fibre; Access panel

RH = Electric reheat coil (accessory)
NA       Not assigned
RM       No internal heating controller,
PWM control signal input (230 VAC, pulse width modulation)
RC       With internal heating controller (0…10-VAC control signal input)

ZT  = Tailored product (ETO)
N       No
Y       Yes

Code example

MFC/G-100, MA=CS, CU=EC, FS=DS, SA=NA, RH=NA, ZY=N

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