Halton Max Ultra Circular (MUC) – Airflow management damper

Quick to install due to the individually pre-calibrated airflow values. This airflow damper is maintenance free because the dust doesn´t effect the measurement sensors.
Halton Max Ultra Circular (MUC) has wide measurement range.

Application areas

• Variable (VAV) and constant (CAV) airflow control applications
• Supply and exhaust installations

Key features

• Insensitive to dust collection
• Enables flexibility in terms of space layout design
• Individually calibrated for higher accuracies
• Low pressure loss for reducing the noise level
• Can be connected to Buildings Management System (BMS)
• Halton Max Ultra Circular (MUC) technical performance:
  Velocity range 0,5 — 10,0 m/s
  General Measurement Uncertainty
  Accuracy ±5 %
  Minimum Safety distance 1D
  Expected Measurement Uncertainty, when correct installation parameter is applied ± % or l/s depending, which is the greatest of the percentage or the absolute value for the specific product size.
  Dim. 100 = ±5 % or ±1,00 l/s
  Dim. 125 = ±5 % or ±1,25 l/s
  Dim. 160 = ±5 % or ±2,5 l/s
  Dim. 200 = ±5 % or ±4,0 l/s
  Dim. 250 = ±5 % or ±6,5 l/s
  Dim. 315 = ±10 % or ±10 l/s
  Note: The measurement uncertainty is defined in laboratory conditions and may be greater in practical installations, where non-optimal installation situations or multiple consequent disturbances may exist.

The damper can function either as a supply or an exhaust unit. It maintains the required airflow through ultrasound measurement, regardless of airflow and pressure variations in the ductwork.

The damper has an airflow controller, two ultrasound sensors for airflow measurement, airflow temperature sensor and an actuator for controlling the damper blade. The airflow controller has a control panel for displaying the measurement values and setting the operation parameters.

The airflow controller can receive the airflow control signal via

• Modbus RTU network variable,
• the control panel input,
• an analogue standard signal.

All three control modes are synchronized between each other. The airflow measurement includes temperature and duct type compensations, providing accurate and reliable airflow measurements even at short distances from airflow disturbances in the ductwork.

The operable airflow range for Halton Max Ultra Circular corresponds to duct air velocities 0.5 – 15 m/s.

The below example shows the airflow ranges and noise levels with air velocity 1-10 m/s.

Fig.1. Quick selection for Halton Max Ultra Circular within air velocity range 1-10 m/s

Airflow control unit

The Halton Max Ultra Circular airflow controller LAC-1.UO1-controls the airflow using ultrasound technology. It provides accurate airflow measurements with two ultrasound sensors.

Technical data

Actuator

The actuator includes an integrated dynamic differential pressure sensor. The pressure sensor has a low bypass airflow rate through the sensor element. Depending on the model, airflow rate limits are adjusted on site with a mobile application or a dial for manual adjustment.

Pressure-independent variable airflow control damper for supply and exhaust installations.

Construction

• Damper includes airflow controller with the control panel, two airflow ultrasound measurement sensors, temperature sensors 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.

Material

• Galvanised or stainless steel (EN 1.4404, AISI 316L).

Electrical data

• Modbus connection or analogue
• Analogue airflow controller control signal input range is 0…10 VDC or 2 …10 VDC and output range 0…10 VDC for airflow feedback
• Power supply voltage 24 V DC/AC

Parameter setting

• Design airflow range limits are calibrated at the factory.
• Controller settings are adjustable on site with Modbus connection or manually from the control panel

Accessories

• Sound attenuator for noise reduction. An access panel can be added for easy maintenance.
• Electric reheat coil with an 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 an internal heating controller. Power supply 230 VAC. A safety overheat thermostat with both automatic and manual reset is incorporated in the heater. A room controller is required to control the duct heater with a 0…10 VDC control signal.

Installation options

There are three options to position the damper. Sensors can be directed outwards, side or inwards in respect to duct parts like bend or T-branch subsequent in the airflow direction.

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.

To ensure the accuracy of the airflow measurement, the minimum safety distance has to be longer or equal to one duct diameter distance.

NOTE: The recommended safety distance is longer or equal to three duct diameters’ distance, to ensure optimal accuracy.

Wiring

The wiring must be carried out by professional technicians following local regulations. For the power supply, a safety-isolating transformer must be used.

Controller connections

Controller settings

Wiring diagram for master-slave configuration

Wiring diagram for parallel configuration

Control scheme for Halton Max Ultra Circular with a master-slave configuration
In the following example, the supply unit is controlling the exhaust unit.

Control scheme for Halton Max Ultra Circular with a parallel configuration

Before the system startup the controller, installation parameter and optionally the Modbus communication parameters have to be set.

The airflow rates for Halton Max Ultra Circular are preset at the factory. If the airflow rates are not specified by the customer, the default factory settings are:

• 0 l/s for the minimum airflow rate
• the maximum airflow rate corresponds to 10 m/s airflow velocity

The maximum airflow rates in the following table are given with an airflow velocity of 10 m/s.

Table 1. Halton Max Ultra Circular factory settings

NOTE: Step-by-step instructions on how to perform the commissioning can be found in the Halton Max Ultra Circular Installation, commissioning and maintenance guide (see section Downloads).

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

Reheat coil dimensions

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

NOTE: For further information, contact Halton Sales.

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

Sound attenuators dimensions and weight

NOTE: Sizes 400 and 500 are not available for Halton Max Ultra Circular (MUC).

Examples of attenuation data:

Attenuation data, L = 600 mm, material = PEF

Attenuation data, L = 1000 mm, material = PEF

NOTE: For further information, contact Halton Sales.

MUC/S-D, MA-CU-FS-SA-RH-ZT

S = Model
G    With blade gasket

D = Size of duct connection (mm)
100, 125, 160, 200, 250, 315

Other options and accessories

MA  = Material
GS     Galvanised steel
AS     Stainless steel (EN 14404/AISI 316L)

CU  = Control unit
G2      GDB 161.1E, 5 Nm

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

SA  = Sound attenuator
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

RH = Electric reheat coil
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)

Code example

MUC/G-100, MA=GS, CU=G2, FS=DC, SA=NA, RH=NA, ZT=N