Halton Max MSB – Slim airflow management damper

Overview

Slim damper, ideal for renovation, corridors and other spaces where the height of damper is critical. Easy to install as no safety distance is required.

Applications

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

Key features

• Rectangular low-profile airflow management damper
• Suitable for VAV supply or exhaust applications
• Can be installed without the need for straight duct lengths
• Highly accurate airflow measurement
• Can be used in both air volume or air pressure control applications
• Integrated sound attenuation
• Can be connected to Buildings Management System (BMS)

Operating principle

Fig.1. Halton Max MSB, supply

The Halton Max MSB includes a closed loop controller, comprising an aluminium differential pressure measuring probe, an actuator mounted on the damper blade spindle and a controller. This system allows the air volume to be accurately regulated independently of variations in upstream pressure. It can be used in a supply or exhaust application.

Measurements made by the differential pressure sensor are sent to the controller which compares these values with the required room setpoint value. The controller compares the actual values with the setpoint value and sends a signal to the actuator which adjusts the position of the damper to compensate for the difference.

It can be used in a supply or exhaust application. Measurements made by the differential pressure sensor are sent to the controller which compares these values with the required room setpoint value. The controller compares the actual values with the setpoint value and sends a signal to the actuator which adjusts the position of the damper to compensate for the difference. An analogue signal to alter the setpoint value can also be sent to the controller and the flow rate will then be adjusted to the new setpoint. Volume flow rates are regulated between the pre-set min. and max. values in the controller.

Fig.2. Halton Max MSB, supply

Fig.3. Halton Max MSB, exhaust

The Halton Max MSB is used for the following applications:

• Constant airflow
  To get a stable airflow without influenced by the pressure variation ductwork
• Variable airflow
  The airflow is managed according the CO₂ or occupancy in the room
• Duct pressure
  To get a stable pressure in the ductwork for specific terminal like diffuser, chilled beam that can be required a constant pressure.

Key technical data

Quick selection

Structure and materials

Control units

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.

Dimensions and weight

Specification

The Halton Max MSB airflow management unit can be applied in both supply and exhaust Variable Air Volume applications. Its compact, low profile design permits installation into challenging spaces where access is limited or where room and false ceiling heights are restricted. The dynamic pressure measurement system allows an accurate measurement of the airflow without upstream safety distances.

The Halton Max MSB comprises:
• an airflow control damper blade
• an aluminium airflow differential pressure measurement probe installed centrally inside the plenum
• an integrated silencer

The pressure differential probe measures the average pressure across the whole surface, and from that accurately determines the actual volume of air passing through the unit. The position of the damper blade is then constantly calculated and adjusted by the actuator mounted on the spindle of the damper blade, in response to the measurements from the dynamic pressure sensor and electronic controller.

The selection of the VAV box is done according to the range of airflow it is designed to control based on performance data compiled from results of performance tests carried out in our Innovation Hubs and Laboratories. Each plenum is calibrated and the controls are pre-set at our factory to the minimum and maximum airflow conditions specified by the client. Factory pre-set parameters and project reference identification information are clearly marked on each unit. The acoustic properties of the Halton Max Slim Box are improved by the inclusion of a symmetrical attenuator containing Euroclass A2 s1 d0 high density mineral wool.

Minimum and maximum airflow values stated are indicative only and can differ by control type or brand, so please check with Halton prior to ordering.

Installation

The Dynamic Measuring System within the Halton Max MSB allows it to be installed directly after a T, elbow or reduction or even on to a main riser duct without affecting the accuracy of the air volume measurement.

Therefore, there is no requirement for safety distances.

Key
1.   Rivet nut M8

The Halton Max MSB is connected to the ductwork thank to the rivet nut M8 (1).

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.

Key
1     (G0) 24 VAC system neutral
2     (~) 24 VAC live
3     (Y) 2…10- or 0…10-VDC airflow setpoint signal input
5     (U) 2…10- or 0…10-VDC airflow feedback signal output

The wiring instructions are presented for following applications

1A and 1B
CU = EM/EC (LMV-D3-MP/MF HI) or EK/EE (NMV-D3-MP/MF HI)
– typical application and overriding controls

1A Typical variable airflow control application 1B Overrides All options

Key
VAV     Halton Max Slim Box (MSB)
1          (G0)  24 VAC system neutral
2          (~) 24 VAC live
3          (Y) 2…10- or 0…10-VDC airflow setpoint signal input
5          (U) 2…10- or 0…10-VDC airflow feedback signal output
*)          Diode 1N 4007

Operating mode

Shut-off with control signal w:
In addition to relay override command situations, the damper will be fully closed if:

• 0…10 VDC: the Halton Max MSB minimum airflow is set to 0% (0 l/s or 0 m3/h) and control signal w falls below 0.45 VDC
• 2…10 VDC : the Halton Max MSB control signal w falls below 0.5 VDC
• Both 0…10 VDC and 2…10 VDC: the airflow setpoint voltage falls below a value corresponding to an air velocity of less than 0.5 m/s

1C and 1D
CU = EM/EC (LMV-D3-MP/MF HI) or EK/EE (NMV-D3-MP/MF HI)
– variable airflow control with a room controller or a building management system

1C Room controller application                    1D Building management system application

Key
VAV       Halton Max MSB
1            (G0) 24 VAC system neutral
2             (~)  24 VAC live
3             (Y)  0…10-VDC airflow setpoint signal input
5             (U)  0…10-VDC airflow feedback signal output
RC           Room controller
PLC         Building management system
C (AO)    Airflow setpoint control signal
F (AI)      Actual airflow feedback input

1E
CU = EM/EC (LMV-D3-MP/MF HI) or EK/EE (NMV-D3-MP/MF HI)
– parallel airflow control with a building management system

1E  Parallel airflow control with building management system

Key
1             (G0) 24 VAC system neutral
2             (~) 24 VAC live
3             (Y) 0…10-VDC airflow setpoint signal input
5             (U) 0…10-VDC airflow feedback signal output
PLC         Building management system
C             (AO) Airflow setpoint control signal
F             (AI) Actual airflow feedback input

3A and 3B
CU=EG (GLB181.1E/3)
– typical variable airflow control and position and constant airflow control

3A Typical airflow control application      3B  Position and constant airflow control

Key
VAV       Halton Max MSB
2            (G0) 24 VAC system neutral
1            (G) 24 VAC live
8            (YC) 2…10- or 0…10-VDC airflow setpoint signal input
9            (U) 2…10- or 0…10-VDC airflow feedback signal output
6            (Y1) Override input
7            (Y2) Override input

Commissioning

The actual airflow rate can be calculated as a function of differential pressure at the measurement probe and the measurement probe k factor. The proper k factor can be found in the documentation supplied with the product and in the table below (supply and exhaust).

q_v             Actual airflow rate [l/s]
k               k factor value
Δp_m          Differential pressure of measurement probe [Pa]

Order code

MSB-M-W-H; CU-SE-TF-ZT

Order code example

MSB-S-200-150; CU=EM, SE=NA, TF=TF1, ZT=N