Halton Max MOC – Airflow management damper (VAV)

Overview

Circular airflow management damper for a wide variety of standard VAV applications. Quick and easy commissioning with factory-set airflow rate limits according to customer-specific needs.

• Averaging cross measurement tubes, basic actuators, 1-10 m/s airflow velocity
• Suitable for both supply and exhaust installations
• Available also for Halton Vita OR operating room and Halton Workplace applications

Product models and options

• Models with blade gasket (EN 1751, class 4 tightness) and/or external insulation available
• Casing tightness fulfills EN 1751, class C requirements
• 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

Operating principle

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.

Key technical data

The Halton Max One MOC airflow management dampers are available in four product models:
G and I:

• Product models G and I include a blade gasket for airtight shut-off operation.
• Product model I include a 50 mm insulation for air radiated sound.

Quick selection

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

System package

Halton Workplace WRA room automation system package for Halton Max MOC airflow management damper

Halton Workplace WRA is part of the Halton Workplace solution offering.

Fig.1. Halton Jaz JDA static diffuser and Halton Max MOC circular VAV damper combined with a Halton Workplace room automation controller.

Halton Workplace WRA is a controller especially designed for controlling the automation system of office spaces and meeting rooms. It is used for controlling the ventilation airflow, room temperature, and indoor air quality.

The Halton Workplace WRA room automation package consists of a controller unit and optional components depending on customer needs: a wall panel and sensors for temperature, CO₂, occupancy, pressure, and condensation.

There are options available for the controller unit and wall panel, depending on the number of controls and sensors required. The Halton Workplace WRA room automation controller is always combined with other Halton products for adaptable and high-level indoor climate.

Application area

• Controlling the ventilation airflow, room temperature, and indoor air quality in office spaces and meeting rooms
• The Halton Workplace WRA room automation controller is an important part of the Halton Workplace system, controlling room units and airflow control dampers
• Overall Halton Workplace System includes:
  • Room air conditioning applications with Halton Workplace WRA room automation controller:
    • Active chilled beams
    • Exhaust units
    • VAV dampers
    • Active VAV diffuser
• Halton Max MDC, zone control dampers
• Halton Workplace WSO, system optimiser

Key features

• Factory-tested controller and wiring, easy to install
• Pre-installed project-specific parameters, quick to commission
• Several operating modes based on occupancy, thermal comfort, and indoor air quality
• Enables fully flexible layout solutions for changing needs in office environments
• Highly energy-efficient and reliable system operation

Operating principle

The Halton Workplace WRA room automation controller operates with Variable Air Volume (VAV) dampers and active chilled beams of the Halton Workplace system. These are used for adjusting the ventilation airflow, room temperature, and indoor air quality in office spaces.

Each room unit in an office space can have its own dedicated Halton Workplace WRA room automation controller, or a single controller can control multiple room units. The Halton Workplace WRA room automation controller can automatically adjust the system according to the indoor environment level preferred by users. Each room unit having its own dedicated controller brings maximum flexibility.

Room automation: Halton Jaz JDA and Halton Max MOC VAV damper controlled with Halton Workplace WRA room automation controller

Fig.2. Halton Jaz JDA diffuser and Halton Max MOC airflow management damper, controlled with Halton Workplace WRA room automation controller in a single office room

Room automation description

In this configuration, the Halton Workplace WRA room automation controller (type DXR2.E12P-102A) controls a Halton Jaz JDA diffuser that is combined with a Halton Max MOC airflow management damper. External CO₂ and occupancy sensors are installed in the room. The temperature sensor is integrated into the wall panel (type QMX3.P34). The system also includes an exhaust VAV damper and radiator heating water valve control. One Halton Workplace WRA room automation controller can individually control up to four room units, and there can be several Halton Workplace WRA room automation controllers in the room.

Design criteria for room automation

• Supply airflow control
• Exhaust airflow control
• Window switch control
• External CO₂ and occupancy sensors
• Wall panel with temperature sensor and display
• Radiator heating water valve control

Schematic drawing

Fig.3. Schematic drawing: Halton Jaz JDA diffuser and Halton Max MOC airflow management damper, controlled with Halton Workplace WRA room automation controller

Equipment list

Wiring diagram

For the wiring diagram of similar configuration, see the product pages of the Halton Workplace WRA room automation controller.

Components and order code examples for the system

• 1 x Passive diffuser: Halton Jaz JDA
  – JDA/S-125(R4) WS=NA, CO=W, ZT=N + TRI/S-125-125(N)
• 1 x VAV damper: Halton Max One Circular
  – MOC/G-125, MA=CS
• 1 x Exhaust unit: Halton AGC Exhaust grille + Halton PRL Plenum for grilles
  – AGC/N-400-100 FS=CL, ME=A, FI=PN, CO=W, ZT=N+PRL/F-400-100-160
• 1 x VAV damper: Halton Max MOC
  – MOC/G-160, MA=CS
• Automation package: 1 x Halton Workplace WRA room automation controller unit with related components
  – WRA/MOC-E21-EV-EX4, WP=34, LC=NA, SE=NA, SW=NA, ST=NA, SL=OE, PM=NA, TC=NA, CV=NA, RV=RA, ZT=N

Note: For more information, see the product pages of the Halton Workplace WRA room automation controller.

Structure and materials

Fig.4. Halton Max One 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 with a low bypass airflow rate through the sensor element. Therefore not to be used in highly contaminated environments. Airflow rate limits are set at the factory.

* Only for airflow measurements

Dimensions and weight

Halton Max MOC, G-model (non insulated)

Halton Max MOC, I-model (insulated)

*⁾    Body length changed as of 1st January 2021 (248 -> 331 mm)
^**)  Control unit is included in weight

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 insulation layer.

Material

• Galvanised steel, with an airflow measurement probe of aluminium
• Stainless steel, with measurement probe of stainless steel

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

• Design airflow range limits are calibrated at the factory.

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.

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.5.  Bend (90° elbow)

Fig.6.  T-branch

Fig.7.  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 rates for Halton Max MOC are preset at the factory. If the airflow rates are not specified by the customer, the default factory settings are 0 for the minimum airflow rate and the nominal value (Vnom) for the maximum rate.

The nominal airflow rates in the following table are given with a pressure level of 150 Pa. Applies to all Halton Max MOC actuator models.

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

where

• q_v            Actual airflow rate [l/s]
• k              k factor of the product
• Δp_m         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 listed in the following table:

Accessories

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

Fig.9.  Attenuation data, L = 1000 mm, material = PEF

For further information, contact Halton sales.

Order code

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

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

Heating capacity with an air velocity of 6 m/s

For further information,  contact Halton Sales.

Order code

RH=RM or RH=RC

Order code

MOC/S-D, MA-CU-FS-SE-TF-SA-RH-ZT

S = Model
G      With blade gasket
I       With blade gasket and insulation (50 mm)

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

Other options and accessories

SP  = System package
N       No
Y       Yes

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

CU  = Control unit
EM        LMV-D3-MF-F.1 HI (DC 0/2…10 V), 5 Nm
EK        NMV-D3-MF-F.1 HI (DC 0/2…10 V), 10 Nm
EC        LMV-D3-MP (MP bus), 5 Nm
EE        NMV-D3-MP (MP bus), 10 Nm
ER        LMV-D3-KNX (KNX bus), 5 Nm
ES        NMV-D3-KNX (KNX bus), 10 Nm
ET        LMV-D3-MOD (Modbus RTU), 5 Nm
EU        NMV-D3-MOD (Modbus RTU), 10 Nm
EH        GDB181.1E/3 (DC 0/2…10 V), 5 Nm
EG        GLB181.1E/3 (DC 0/2…10V), 10 Nm
EV        GDB181.1E/KN (KNX bus), 5 Nm
EW      GLB181.1E/KN (KNX bus), 10 Nm
EB        GDB181.1E/MO (Modbus RTU), 5 Nm
EF        GLB181.1E/MO (Modbus RTU), 10 Nm
V1        LM24A-VST, (DC 0/2…10 V), 5 Nm+VRU-D3-BAC (only for airflow measurements)
V2        NM24A-VST, (DC 0/2…10 V), 10 Nm+VRU-D3-BAC (only for airflow measurements)
V3        LMQ24A-VST, 2.5 sec (DC 0/2…10 V), 4 Nm+VRU-D3-BAC (only for airflow measurements)
V4        NMQ24A-VST, 4 sec (DC 0/2…10 V), 8 Nm+VRU-D3-BAC (only for airflow measurements)
HM       ECL-VAV-S, HAV (LonWorks), 5Nm
HK        ECL-VAV-N, HAV + NM24A-SR (LonWorks), 10 Nm

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

SE = Sensors
NA        Not assigned
DS1      Duct sensor (CO₂G, Duct CO₂)
P1         Differential pressure transmitter (HDP-PE)

TF = Transformer
NA      Not assigned
TF1     230/24 transformer (35VA)

SA  = Sound attenuator (accessory)
-> only available from Kausala, Finland
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 pane
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)
-> only available from Kausala, Finland
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
N       No
Y       Yes (ETO)

Sub-products

RD      Room sensor, CO₂ (default settings, TCO₂)
RP       Room sensor, CO₂ (customer specified settings, TCO₂)
HW     Occupancy sensor, wall (HOS-OE1)
HC      Occupancy sensor, ceiling (HOS-OE2)

Code example

MOC/G-100, SP=N, MA=CS, CU=EM, FS=DC, SE=NA, SA=NA, RH=NA, ZT=N