This airflow management damper operates as a fundamental element of the supply and exhaust ductwork zones in the Halton Workplace system.
The Halton Max MDC airflow management damper operates as a fundamental element of the supply and exhaust ductwork zones in the Halton Workplace systems.
This management damper can operate either in duct static pressure control mode or duct airflow control mode.
Typically at the Halton Workplace zonal level, supply air is kept at constant pressure with the Halton Max MDC. Exhaust air is operated with the airflow control mode.
For ductwork static pressure control, airflow management damper is used with static pressure measurement unit Halton MSS.
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.
The damper contains airflow measurement with orifice plate, controller, pressure measurement sensor and an actuator for controlling the damper blade.
The airflow controller can receive the airflow control signal via
|Duct connection sizes||ø125-500 mm|
|Air velocity range||
|Operating range (ambient temperature)||0-50 ℃|
|Ambient relative humidity (non-condensing)||＜ 95%|
|Standards and certifications||
The operable airflow range for Halton Max MDC 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.
|1||Control box||Galvanised steel|
|2||Duct seal gasket||Rubber|
|6||Blade gaskets||EPDM rubber|
|7||Orifice plate gasket||EPDM rubber|
|8||Orifice plate||Galvanised steel|
The pressure-independent variable airflow management damper is made of galvanised steel, with an airflow measurement with orifice plate.
Duct connection shall include integral airtight rubber gaskets.
The management damper section shall contain airflow measurement, flow controller and damper actuator.
The variable air volume control damper includes both constant pressure and airflow control applications, and, is available for BACnet/IP communication protocol.
The Halton Max MDC airflow control damper is installed taking into account the required safety distances. 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.
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.
To ensure the accuracy of the airflow measurement, the minimum safety distances are defined for different installation options below. The safety distance is same for all damper sizes.
Fig. 1. After 90° elbow
Fig. 2. T-branch side flow
Fig. 3. After enlarger
Fig. 4. After reducer
Fig. 5. Before T-branch
The recommended safety distance between Halton Max MDC control damper and Halton MSS measuring unit is 5 x D.
|1, 2 Ethernet||2x RJ45 interface for 2-port ethernet switch||–||–||–|
|11, 12 KNX||KNX connection||+, –||–||–|
|51…52 power 24 V AC||Power supply SELV / PELV AC 24 V||V~||–||–|
|64…69 Triac outputs||Switching output AC 24V||Y3…Y6||11||3…6|
|71 Digital output||Positioning output DC 0…10 V||Y10||21||1, 2|
|Universal inputs||X1, X2||1||5, 6|
|ΔP Differential pressure detector||Connected to the higher pressure||P1+||31||1|
|Connected to the lower pressure||P1-||31||1|
|Motor Control Outputs||Shaft turns clockwise (CW)||–||11||2|
|Shaft turns counter clockwise (CCW)||–||11||1|
Fig.6. Halton Max MDC with static pressure control
Fig.7. Halton Max MDC with airflow control
Airflow rate ranges of the Halton Max MDC are presented in the table below. The airflow rate range is valid both for pressure and airflow control applications.
On typical Halton Workplace zone control application, the supply airflow is based on constant pressure control and exhaust airflow is based on airflow control. In this application the actual supply airflow is measured and sent as a setpoint to exhaust airflow controller. Therefore, airflow rate ranges are essential factors both for supply and exhaust air applications.
|NS||k factor [l/s]||k factor [m3/h]|
@ 0.5 m/s
@ 6 m/s
@ 0.5 m/s
@ 6 m/s
The actual airflow rate can be calculated as a function of differential pressure at the Halton Max MDC measurement probe and the measurement probe k factor. The proper k factor can be found in an attachment for the product.
qv Actual airflow rate [l/s]
k k factor of the product
Δpm Differential pressure of measurement probe [Pa]
The Halton Max MDC airflow management damper is 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.
Zone pressure setpoint is set as a network variable. The static pressure setpoint range on Halton Workplace application is 40 to 200 Pa.
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.
The room system options are operated by the zone VAV control damper (MDC) with constant pressure ductwork (pressure dependent) for supply air and constant velocity ductwork for exhaust air (pressure independent).
Exhaust airflows are transferred through ceiling or wall grilles towards the common exhaust unit.
Exhaust airflows are transferred through ceiling or wall grilles directly to room branch ducts and via the main branch to the main riser duct.
Some spaces are equipped with exhaust grilles or diffusers (usually meeting rooms and other separate spaces) and other spaces are transferring the air towards the common exhaust (usually open spaces and other common areas without walls)
Halton offers high-quality rectangular sound attenuators with round duct connection for reducing noise levels in the duct. The sound attenuators are available as accessory with the following options:
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.
NOTE: Sizes 100 and 630 are not available for Halton Max MDC.
Fig. Attenuation data, L=600mm, material=PEF
Fig. Attenuation data, L=1000mm, material=PEF
NOTE: For further information, contact Halton Sales.
S = Model
G Damper with blade gasket
I Damper with blade gasket, insulation 50 mm
D = Connection size (mm)
125, 160, 200, 250, 315, 400, 500
MA = Material
GS Galvanised steel
CU = Control unit
S1 DXR2.E10PL-102B (BACnet/IP), 10 Nm
CM = Control mode
F1 Supply airflow control
P1 Supply pressure control
F2 Exhaust airflow control
P2 Exhaust pressure control
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
ZT = Tailored Product
MDC/G-160, MA=GS, CU=S1, CM=F1, ZT=N