• Duct pressure control application
• The static pressure control damper HFS is designed to be used in combination with static pressure measurement unit MSS to maintain the desired constant duct pressure
• Circular duct connection equipped with integrated rubber gaskets
• Shut-off operation available, tightness fulfills EN 1751, class 4 requirements
• Casing tightness classification: EN 1751, Class C
• Galvanized steel design

Product models and Accessories

• Model with extended actuator platform to allow insulation work on site
• Insulated model with external metal sheet cover
• Integrated flow measurement unit (manual or with 0…10 V output signal) as an accessory
• Several sound attenuator models

The static pressure control damper shall be made of galvanised steel. An additional airflow measurement probe is made of aluminium.

The tightness of the control damper in closed position shall conform to standard EN1751 class 4 and casing tightness to EN1751 class C.
Duct connection shall include integral airtight rubber gaskets.

The control damper section shall contain pressure controller and damper actuator and optionally airflow measurement. The damper shall be used in combination with Halton MSS pressure measurement unit.

The damper shall be equipped with a sound attenuator in order to meet the sound level requirement for the room. As an optional extra, the sound attenuator shall have an access panel for cleaning purposes

• Dimensions and weight
• Material
• Function
• Product Models
• Sound Attenuators
• Installation
• Commissioning
• Technical Specification
• Order Code

Halton HFS

Static Pressure Control Damper

• Duct pressure control application
• The static pressure control damper Halton HFS is designed to be used in combination with static pressure measurement unit Halton MSS to maintain the desired constant duct pressure
• Circular duct connection equipped with integrated rubber gaskets
• Shut-off operation available, tightness fulfils EN 1751, class 4 requirements
• Casing tightness classification: EN 1751, Class C
• Galvanised steel design

Product Models and Accessories

• Model with extended actuator platform to allow insulation work on site
• Insulated model with external metal sheet cover
• Integrated flow measurement unit (manual or with 0…10 V output signal) as an accessory
• Several sound attenuator models

Dimensions and weight ▲

Halton HFS/G, without measurement unit (MU=NA)

Weight

Halton HFS/E, without measurement unit, with extended actuator plattform (MU=NA)

Halton HFS/G, with manual measurement (MU=A)

Halton HFS/G, with electrical measurement unit  0…10 V (MU=B)

Halton HFS/I, with manual measurement unit and insulation (MU=A)

Halton HFS/I, with electrical measurement unit  0…10 V and insulation (MU=B)

Material ▲

Duct connection gaskets are vulcanised to the casing.

Function ▲

The static pressure control damper Halton HFS maintains the desired constant duct pressure based on a static pressure measurement signal from Halton MSS unit (0...10 VDC).

Halton HFS features:

• For supply and exhaust installations
• Complete shut-off function
• Static pressure set point range of 0...1000 Pa (see MSS specifications)
• Maximum differential pressure over the damper of 500 Pa
• Operating range: ambient temperature of 0 to 50 ºC
• Ambient relative humidity < 95%, non-condensing
   

Optimal and steady operation is ensured by using the Halton MSS static pressure measurement unit. The given safety distances shall be applied. Do not use any other pressure measurement units in order to ensure proper control accuracy.

The Halton MSS has several pressure measurement ranges, 0…100 Pa, 0…200 Pa (default), 0…500 Pa and 0…1000 Pa.

Airflow measurement may be done manually using model HFS-A and manometer.
Using model Halton HFS-B actual airflow rate is available as 0…10 VDC or 2…10 VDC signal.

The Halton HFS control damper contains a pressure controller (PC), which controls the damper actuator (FG) based on the feedback signal from the Halton MSS pressure transmitter (PE) so that the set value is realised.


 

Product Models ▲

Halton HFS static pressure control damper is available in several versions.
The blade gasket enables airtight shut-off operation, and external insulation is used to attenuate radiated sound into the space and reduce heat transfer. Insulation model is covered with metal casing.

The Halton HFS control damper contains a pressure controller (PC), which controls the damper actuator (FG) based on the feedback signal from the MSS pressure transmitter (PE) so that the set value is realised.


Fig.1. Pressure control damper with manual air flow measurement


Fig.2. Pressure control damper with air flow measurement unit
 

Control unit (CU)

All HFS models are equipped with pressure controller Belimo VRP-STP and actuator NM24A-V (CU=EP). When model Halton HFS/S-D-B is chosen, Halton HFS has an integrated flow measurement unit (Halton MSD) and an analog signal transmitter for measured flow.

Set point can be adjusted locally by set point potentiometer or remotely using 2-10Vdc signal.

See Halton MSS and Halton MSD technical data from HIT section for those in question.

Sound Attenuators ▲

Sound attenuators are available with optional outlet diameters with mineral wool (MW) or polyester fibre (PEF) insulation materials and with 600 mm and 1000 mm lengths. Optionally the attenuator can be equipped with an access panel for cleaning and inspection purposes.

H1...H8 Attenuator without access panel
H11...H18 Attenuator with access panel

The connection (D1) is female type for direct connection to the Halton HFS pressure control damper. The duct connection (D2) is male type and either damper size or one size larger. Technical information is based on bigger of the duct connections (D2).

Attenuator dimensions

Fig.1. Supply air installation. In exhaust installation the airflow direction is vice versa, from D2 to D1.

Attenuation data

Material:  Mineral wool (MW), frequency band (Hz)

Material: Polyester fibre (PEF), frequency band (Hz)

Installation ▲

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.
The pressure control damper is installed taking into account the recommended safety distances for accurate and stable control.

Minimum safety distances of all Halton HFS models

Fig.1. Bended duct                                             Fig.2. T-branch; supply


Fig.3. T-branch; exhaust                               Fig.4. Installation with sound attenuator

Static pressure measurement unit MSS should be installed in a ductwork in a place where static pressure is most suitable. Usually the place is in supply and exhaust duct 3/4 of ductwork length. Also safety distance before MSS unit must be observed.

Minimum safety distance between Halton HFS and Halton MSS

Fig.5. Supply air

Fig.6.  Exhaust air

Airflow measurement with Halton MSD

The pressure control damper with air flow measurement unit 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 in accordance with local regulations and by professional technicians. For the power supply of all control options, a safety-isolating transformer shall be used.

Degree of protection

• Actuator NM24A-V: IP54
• Pressure controller VRP-STP: IP40
• Flow controller VRD3: IP40

The wiring instructions are presented for following applications

1A     HFS; CU=EP     Constant zone pressure control, set point adjusted locally
1B     HFS; CU=EP     Constant zone pressure control, set point adjusted remotely
1C     HFS; CU=EP     Overriding controls
2A     HFS-B; CU=EP  Constant zone pressure control with air flow measurement unit

Control unit (CU)
EP       Belimo VRD2 + NM24A-V (10 Nm)

1.  Halton HFS; CU=EP - duct pressure control

Fig. 7. 1A = Typical duct pressure control local pressure set point.

Fig.8. 1B = Set point adjusted externally

1. Halton HFS; CU=EP - duct pressure control with override controls

Fig.9. 1C = Duct pressure control with over-riding controls

Code Description
Halton           Delivered by Halton
3rd party       Delivered by a third party

1 (^)              24 VAC system neutral
2 (~)             24 VAC live
3 (w1)           2...10 VDC pressure set point signal input,
                    when set point adjusted remotely
5 (U5)           2...10 VDC pressure feedback signal output
6 y               Override input
7 z               Override input
*)                 Jumper 2-4 factory-fitted for potentiometer set point;
                    remove if 2...10-VDC input w1 is used
**)                Diode 1N 4007

2. HFS-B; CU=EP - duct pressure control with air flow measurement unit

Fig.10.  2A = Duct pressure control with air flow measurement

Code Description
Halton          Delivered by Halton
3rd party       Delivered by a third party

VRP-STP      Pressure controller
1 (^)              24 VAC system neutral
2 (~)             24 VAC live
3 (w1)           2...10 VDC pressure set point signal input.
                    when set point adjusted remotely
5 (U5)           2...10 VDC pressure feedback signal output
6 y               Override input
7 z               Override input
*)                 Jumper 2-4 factory-fitted for potentiometer set point;
                   remove if 2...10-VDC input w1 is used
**)                Diode 1N 4007

VRD3           Air flow measurement
1 (^)             24 VAC system neutral
2 (~)            24 VAC live
5 (U5)           ...10 VDC pressure feedback signal output (actual airflow rate)

The output signal 5 (U5) can be used to control an eventual exhaust airflow control damper.

Pressure transmitter connection between Halton HFS and MSS

Fig.11. Connector cable between Halton HFS (VRP-STP) and Halton MSS

Length of the cable for pressure measurement unit Halton MSS provided with Halton HFS is 0.7 m. Needed extension connection cable is supplied by 3rd party.

Wire Code Description    
1   24 VAC system voltage    
2   Neutral      
3   0...10 VDC pressure measurement signal  
 

Commissioning ▲

Setting duct pressure

The pressure controller has a set point potentiometer for pressure set point adjustment.

Local setting
The pressure controller VRP-STP includes a potentiometer for static pressure set point adjustment (range: 30…100% of the selected Halton MSS unit pressure range).

An example:

• Needed constant pressure set point is 120 Pa
• Choose pressure range of 0…200 Pa in MSS
• Adjust the set point potentiometer Dp% to 60% (=120 Pa / 200 Pa)

Remote setting
Set point can be set externally from building management system, air pressure range 0-100% corresponding to control signal range of 2-10 Vdc. Local set point potentiometer shall be set to 100%.
 

Defining measured duct pressure level

The actual measured static pressure level can be defined by the controller feedback signal (U5).

The actual duct static pressure can also be read from the picture:

Static pressure and output signal:
A = Pressure transmitter range 0…100 Pa
B = Pressure transmitter range 0…200 Pa

Static pressure and output signal:
A = Pressure transmitter range 0…500 Pa
B = Pressure transmitter range 0…1000 Pa
 

Defining the measured airflow

With model Halton HFS,MU=A airflow can be defined manually using integrated airflow measurement unit Halton MSD.

Connect the measurement tubes to the manometer and read the pressure difference. The airflow rate is calculated using the formula below or by reading the airflow rate directly from the diagram:

The k  factor

With model Halton  HFS/B air flow can be defined using integrated air flow measurement unit (Halton MSD + VRD3). The actual measured airflow rate (qv) can be defined by the controller feedback signal (U5) and the nominal airflow (qv_nom) of the airflow measurement unit (VRD3).

Nominal airflow rates of the Halton HFS are presented in the table below.

Technical Specification ▲

The static pressure control damper shall be made of galvanised steel. An additional airflow measurement probe is made of aluminium.

The tightness of the control damper in closed position shall conform to standard EN1751 class 4 and casing tightness to EN1751 class C.
Duct connection shall include integral airtight rubber gaskets.

The control damper section shall contain pressure controller and damper actuator and optionally airflow measurement. The damper shall be used in combination with Halton MSS pressure measurement unit.

The damper shall be equipped with a sound attenuator in order to meet the sound level requirement for the room. As an optional extra, the sound attenuator shall have an access panel for cleaning purposes.

Order Code ▲

HFS/S-D-MU

S  = Construction
        G     Standard unit with blade gasket
        E     Standard unit with blade gasket and extended motor platform
               (for on-site insulation work)
         I      Unit with blade gasket and 50 mm insulation
               (only for models MU=A or MU=B)

D  = Size of duct connection
        200, 250, 315, 400, 500
 

Other options and accessories

MU= Measurement unit
         NA     Not assigned 
         A       Air flow measurement unit MSD (manual)
         B       Air flow measurement unit MSD+VRD3, electrical (0...10V)

CU= Control unit
          EP  VRP-STP+NM24A-V

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

ZT = Tailored product
         N         No
         Y         Yes
 

Code example

         HFS/G-200-B, CU=EP, SA=NA , ZT=N