HFL - Air flow Management

Linear airflow management unit

Accurate linear damper for constant low-pressure applications. Airflow characteristic is linear in relation to damper position and control signal. Insulated damper with excellent sound level.

  • Linear airflow control unit for constant low-pressure applications
  • Airflow characteristic is linear in relation to damper position and control signal
  • Circular duct connection with rubber gasket
  • Product insulated with polyester fiber
  • Galvanized steel design

PRODUCT MODELS &ACCESSORIES

  • Sound attenuator as an accessory
  • Outlet plenum as an accessory

The flow characteristic of the airflow control damper shall be linear in relation to control signal input and damper position. The unit shall operate in constant low-pressure ductworks.

The linear airflow unit shall be made of galvanised steel.
Circular duct connections D=160…315 mm shall include rubber gaskets.
The casing shall be acoustically insulated with 25 mm thick polyester fibre to avoid airborne noise emission to the duct and radiated noise through the damper casing.
The unit shall have an access hatch for cleaning purposes.

Should the generated noise level require it, an attenuator shall be provided. The attenuator module with the same cross-section dimensions shall be installed directly to the linear damper and shall be equipped with an access hatch.

The unit outlet shall have an outlet plenum option with two circular duct connections. The outlet plenum shall be equipped with an access hatch.

Introduction

HFL

Linear airflow control damper

  • Linear airflow control unit for constant low-pressure applications
  • Airflow characteristic is linear in relation to damper position and control signal
  • Circular duct connection with rubber gasket
  • Product insulated with polyester fibre
  • Galvanised steel design
     

Product Models & Accessories

  • Sound attenuator as an accessory
  • Outlet plenum as an accessory

Dimensions


DIMENSIONS

 


 

NS L L1 W H H1 kg
160 458 584 432 222 111 19.3
200 618 744 592 272 136 21.5
250 618 744 592 336 168 22.0
315 618 744 592 382 191 25.8

 

Nominal size (NS) refers to ductwork connection size.
 

Material


MATERIAL


PART  MATERIAL 
Casing Galvanised steel
Control plate Galvanised steel
Duct gaskets 1C-polyurethane hybrid
Shaft Zinc coated steel
Shaft bearing Polyacetal plastic
Linear plate bearings Steel
Insulation material Polyester fibre
Measurement tap Polyurethane


Accessories


ACCESSORIES

ACCESSORY  CODE  DESCRIPTION 
Actuator   Included in delivery
Sound attenuator SA  
Outlet plenum OP  


Actuator


As standard delivery and part of the product code, the HFL is equipped with Belimo NM24A-MF damper actuator.

ACTUATOR  TORQUE  CONTROL
ARRANGEMENT
 
OPERATING
VOLTAGE
 
POWER
CONSUMPTION
 
NM24A-MF 10 Nm Control signal input 0...10 VDC
Operating range 0...10 VDC (0...100%)
Manual override operation
Mechanical position limit
24 VAC 3 VA



Function


FUNCTION


The linear HFL airflow control unit contains a linear airflow damper and an actuator. The airflow characteristic is linear in relation to control signal and damper position on constant pressure ductwork. Changing the damper blade position controls airflow rate.

The minimum and maximum airflow rates can be adjusted by limiting the damper actuator rotation angle either mechanically or electrically. Mechanical limits are typically used, if the HFL is connected to a local room controller. Electrical bounds can be used especially when the HFL is connected to a building management system.

Actuator control signal input is 0-10 VDC with operating range of 0-10 VDC corresponding to damper movement of 0-100%.

Performance values and airflow rates for 0-opening are directive.



Sound Attenuator


SOUND ATTENUATOR

 


 

NS ØD L1 L2 L3 W1 H Wt., kg
160 160 600 0 / 65 65 432 222 10.2
200 200 600 0 / 65 65 592 272 12.4
250 250 600 0 / 65 65 592 336 13.5
315 315 600 0 / 65 65 592 382 15.8




Sound attenuator connection (L2) can be selected on site to either male or female. The male interface is used for duct connection between the sound attenuator and the HFL. The female interface is used for direct connection between the sound attenuator and the HFL. Interface (L3) of the sound attenuator is always a male connection.

The sound attenuator has an access hatch for cleaning purposes.

Outlet Plenum


OUTLET PLENUM

 

 

NS ØD ØD2 L1 L2 W1 W2 H Wt., kg
160 160 125 600 0 / 65 432 65 222 8.1
200 200 160 600 0 / 65 592 65 272 10.8
250 250 200 600 0 / 65 592 65 336 11.8
315 250 250 600 0 / 65 592 65 382 13.8


Outlet plenum inlet connection (L2) can be selected on site to either male or female. The male interface is used for duct connection between the outlet plenum and the HFL or sound attenuator. The female interface is used for direct connection between the outlet plenum and the HFL or sound attenuator. Outlet interfaces (W2) of the outlet plenum are always male connections.


The outlet plenum has an access hatch for cleaning purposes.

 

Installation

Installation


Halton HFL
 

Safety distances
 

It is recommended to install the product horizontally.

The airflow control damper is installed taking into account the required safety distances. Install the unit into ductwork in such a way that the air flow direction through the unit is as indicated with the arrow in the unit casing.


 

Wiring

The wiring shall be carried out by professional technicians in accordance with local regulations.
For all control options a safety-isolating transformer shall be used.

Wiring of HFL damper actuator (NM24A-MF) to third party controller or building management system


 

Commissioning

Commisioining


Halton HFL

The Halton HFL airflow rate is defined as a function of the pressure difference over the damper and the damper position. The actual airflow rate can be read from the diagrams below or calculated using the equation below.

The minimum and maximum airflow rates can be adjusted by limiting the damper actuator rotation angle either mechanically or electrically.

Mechanical limits are usually used, if the Halton HFL is connected to local room controller. Electrical bounds can be used in particular when the HFL is connected to building management system.

If minimum and maximum airflow rate are adjusted by setting the actuator mechanical end-stops, press the actuator reset button twice to synchronise the limited rotation angle to a full 0-10 VDC control signal range. The operating range of 0-10 VDC control signal is corresponding to a damper movement of 0-100%.

Performance valuea and airflow rates for 0-opening are directive.

Recommended maximum pressure loss is 150 Pa.



Damper position can be read from actuator scale, where

  • actuator indication value 1 = damper fully closed (0%)
  • actuator indication value 0 = damper fully open (100%)
     

The k value of damper is a function of damper position. In the table below the k values are presented on some specific damper openings. Between these opening, the k value can be interpolated.

For example, the damper opening of HFL-160-160 is 30%:

  • the k value at 20% is 4.0 
  • the k value at 40% is 6.8
  • therefore, k value at 30% is (4.0 + 6.8)/2 = 5.4
     

Unit size Position %
(Indicator value)
   0% (1) 20% 40% 60% 80% 100% (0)
160-160  0.4 4.0 6.8 9.9 13.5 17.3
200-200  0.7 8.6 13.1 17.8 21.8 24.7
250-250  0.7 11.5 18.0 24.3 30.1 35.1
315-315  0.8 20.1 30.6 42.0 54.3 66.7


When the k value and measurement tabs pressure difference is known, the actual airflow can be calculated as:



qv           Actual airflow rate [l/s]
k            The k value of the actual damper position
dP_m     Measurement tabs pressure difference [Pa]
 

Servicing

 

SERVICING

Cleaning the ductwork

To clean the ductwork, remove the bottom panel of the HFL by unscrewing the butterfly nuts (see figure). You will then have access to the exhaust ductwork. It is recommendable to install a separate access hatch in the ductwork on the supply side of the HFL unit, in a suitable position to enable cleaning the ductwork.


 

Specification


SUGGESTED SPECIFICATIONS


The flow characteristic of the airflow control damper shall be linear in relation to control signal input and damper position. The unit shall operate in constant low-pressure ductworks.

The linear airflow unit shall be made of galvanised steel.
Circular duct connections D=160…315 mm shall include rubber gaskets.
The casing shall be acoustically insulated with 25 mm thick polyester fibre to avoid airborne noise emission to the duct and radiated noise through the damper casing.
The unit shall have an access hatch for cleaning purposes.

Should the generated noise level require it, an attenuator shall be provided. The attenuator module with the same cross-section dimensions shall be installed directly to the linear damper and shall be equipped with an access hatch.

The unit outlet shall have an outlet plenum option with two circular duct connections. The outlet plenum shall be equipped with an access hatch.

Product Code


PRODUCT CODE


HFL-D

   D = Connection size
    160, 200, 250, 315

 

Specifics and accessories

   SA = Sound attenuator
    NA  Not assigned
    P1  Connection 160
    P2  Connection 200
    P3  Connection 250
    P4  Connection 315

   OP = Outlet plenum
    NA  Not assigned
    FC  Inlet 160 - outlet 125+125
    FD  Inlet 200 - outlet 160+160
    FE  Inlet 250 - outlet 200+200
    FF  Inlet 315 - outlet 250+250

Code example

   HFL-160, SA=NA, OP=NA

Downloads & Media

Halton HFL - se
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