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MDC_Overview_left_620_350
MDC_Overview_left_620_350

Halton Max MDC – Zone control damper for Halton Workplace system

This airflow management damper operates as a fundamental element of the supply and exhaust ductwork zones in the Halton Workplace system.

  • Airflow is measured with calibrated orifice plate
  • Pressure-independent operation

Overview

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.

Application

  • Airflow is measured with calibrated orifice plate
  • Airflow control damper for Halton Workplace zone control applications
  • Circular pressure-independent variable airflow control damper
  • Supply and exhaust installations

Key features

  • 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
  • Enables flexibility in terms of space layout
  • Project specific settings are preset at the factory
  • Controller settings are easily adjustable on site with BACnet/IP connection or web browser
  • Can be connected to Buildings Management System (BMS)
  • Velocity range 0,5 — 6 m/s
  • General measurement uncertainty: Accuracy ±10 %

Operating principle

MDC_Function

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

  • BACnet/IP

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%
Communication interface BACnet/IP
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
  • Sound attenuator
  • Insulation 50 mm mineral wool for air radiated sound and condensation purposes
Protection class
  • Controller: IP20
Power supply
  • AC 24 V -15%/+20%
Standards and certifications
  • controller CE marking, quality standard ISO9001 compliance
  • building material declaration, declaration of conformity
  • environmental standard ISO14001
  • casing tightness EN 1751 class C
  • shut-off operation tightness fulfils EN 1751 class 4
Maintenance Maintenance-free

Quick selection

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.

MDC_G_2

Structure and materials

MDC_Material

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

Dimensions and weight

Model without insulation

MDC_Dimensions

NS ⌀D L L1 L2 L3 H Weight (kg)
125 124 329 257 184 134 5,5
160 159 329 257 219 169 5,8
200 199 494 422 15 259 209 6,5
250 249 494 422 38 309 259 7,2
315 314 494 422 70 374 324 8,0
400 399 620 545 115 459 409 9,9
500 499 620 545 95 559 509 17,7

Model with insulation (50 mm)

MDC_Dimensions_insulated

NS ⌀D L L1 L2 L4 H1 Weight (kg)
125 124 329 257 305 225 6,3
160 159 329 257 340 260 6,7
200 199 494 422 15 380 300 8,2
250 249 494 422 38 430 350 9,2
315 314 494 422 70 495 415 10,3
400 399 620 545 115 580 500 13,7
500 499 620 545 95 680 600 22,4

Specification

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.

Construction

  • Damper includes airflow measurement with orifice plate, controller, pressure measurement sensor 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 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

Electrical data

  • Communication protocol BACnet/IP
  • Power supply voltage 230 V AC
  • Maximum load for transformer 20 VA

Parameter settings

  • Project specific parameters are preset at the factory
  • Controller settings are adjustable on site with BACnet/IP connection or web browser

Accessories

  • Sound attenuator for noise reduction. An access panel can be added for easy maintenance.

Installation

Installation options

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.

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.

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.

MDC_90_after_safety_distance_1xD

Fig. 1. After 90° elbow

MDC_T_side_flow_safety_distance_3xD

Fig. 2. T-branch side flow

Fig. 3. After enlarger

MDC_reduction_decrease_safety_distance_5xD

Fig. 4. After reducer

MDC_T_after_3D_safety_distance_5xD

Fig. 5. Before T-branch

The recommended safety distance between Halton Max MDC control damper and Halton MSS measuring unit is 5 x D.

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.

Pin Description Terminal Module Channel
1, 2 Ethernet 2x RJ45 interface for 2-port ethernet switch
11, 12 KNX KNX connection +, –
USB USB interface
51…52 power 24 V AC Power supply SELV / PELV AC 24 V V~
System neutral
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
System neutral
73…77 Digital input D1 1 1
Universal inputs X1, X2 1 5, 6
System neutral
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
Service Service button SVC
Display Operation LED RUN

Wiring examples

Pressure control_attenuator
Fig.6.  Halton Max MDC with static pressure control

Airflow control_attenuator

Fig.7. Halton Max MDC with airflow control

Commissioning

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]
125 7.5 27.0
160 11.3 40.6
200 21.7 78.0
250 27.7 99.7
315 44.1 158.8
400 67.3 242.3
500 101.8 366.5
NS 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 40.0 467.0 144.0 1682.0
400 63.5 753.6 229.0 2713.0
500 99.5 1177.0 358.0 4237.0

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.

K_factor

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.

Duct pressure 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.

Product selection examples

Zone exhaust concepts

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).

Centralised exhaust concept

Exhaust airflows are transferred through ceiling or wall grilles towards the common exhaust unit.

Central exhaust

Individual room or zone exhaust concept

Exhaust airflows are transferred through ceiling or wall grilles directly to room branch ducts and via the main branch to the main riser duct.

Room specific exhaust

Hybrid (mixed) exhaust concept

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)

Mixed exhaust

Sound attenuators

Sound20attenuator_overview_right

Description

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:

  • Three lengths: 600, 1000 and 1250mm
  • 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 connection (D1).
  • 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 maintenance purposes

Technical data

259378 - Dimensions

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.

MOC_MFC_sound_attenuator_dimension_table

NOTE: Sizes 100 and 630 are not available for Halton Max MDC.

Examples of attenuation data

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

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

NOTE: For further information, contact Halton Sales.

Order code

MDC/S-D, MA-CU-CM-SA-ZT

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

Other options and accessories

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
N         No
Y         Yes

Code example

MDC/G-160, MA=GS, CU=S1, CM=F1, ZT=N

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Halton Max MDC – Zone control damper for Halton Workplace system
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