Acson Double Skin Modular Air Handling Unit

Introduction

The Acson DM Air Handling Unit is designed based on a modular panelling concept, allowing for subdivision into multiple sections for on-site assembly. It offers a wide variability of airflow range from 195 to 25,000 lps (700 to 90,000 CMH) and up to a total static pressure of 2000 pa (8"W.G) for DM1, DM2, DM2TB, and 2,500pa (10"W.G) for DMA6. The unit can handle both chilled water and direct expansion systems. It is constructed with Double Skin Polyurethane foam (PUR) insulation panels, available in 25mm or 50mm thickness with a density of 40kg/m³. Custom designs for non-standard AHUs are available upon customer request.

Selection software is available for Acson DM AHU to optimize the best arrangement for chilled water or DX systems. Standard components can be selected and placed according to customer requirements. The program provides fan curves, coil performance data, dimensions, and shipment weight.

Nomenclature

The nomenclature for Acson DM Air Handling Units follows a specific structure:

A DM 1 - 10 - 13 B

• A: Acson
• DM: Double Skin Modular
• Panel Thickness: 1 = 25mm, 2 = 50mm, 2TB = 50mm (Thermal Break), A6 = 60mm (Thermal Break)
• 10: Unit Height (1,400mm)
• 13: Unit Width (1,700mm)
• B: Version (only for DM1, DM2, DM2TB)

ADM Cabinet Certifications and Ratings

EUROVENT Certified Ratings

The ADM cabinets are classified according to EN1886 Standard:

AHRI 1350 Certified Ratings

The ADM cabinets are classified according to AHRI Standard 1350 (I-P):

Features

A Complete Line of Accessories for Maximum Flexibility

The modular paneling concept allows for flexible configuration to optimize space utilization. Each section can accommodate various components like dampers, coils, and filters. This enables the creation of compact units or units with ample clearance for maintenance. All Air Handling Units are designed using computer selection for optimal performance.

Two Discharge Direction

Fan discharge direction can be either horizontal or vertical (top and bottom).

Horizontal Arrangement Unit

Diagram showing horizontal arrangement with airflow direction.

Vertical Arrangement Unit

Diagram showing vertical arrangement with airflow direction.

Strong and Rigid Casing/Cabinet

• Low energy consumption and no condensation due to high thermal insulation and airtight casings, certified according to EN 1886 and AHRI 1350.
• Constructed of high-strength extruded round-edge aluminum pentapost and flat surface internal intermediate post.
• Frame channel design allows for rigid frame construction by bolting three identical pieces together to form a composite corner piece.
• Unit walls are made of Double Skin Polyurethane foam (PUR) insulation panels with 0.5 mm high-strength pre-painted steel as external skin and 0.5 mm galvanized steel (GI) as internal skin.
• PU foam insulation thickness is 25mm or 50mm with density 40 kg/m³.

Friendly Access and Maintenance

• Panels can be removed from all unit sections for easy access to components, ensuring unit rigidity through the aluminum frame.
• Access doors or service panels can be supplied with a swing type or removable panel type.
• The unit is mounted on a galvanized steel base frame for easy handling and positioning.
• Internal profile design has been updated from square to round for easier cleaning of the internal compartment.

Maximum Flexibility

• Variable dimensioning features for flexible cabinet sizing (increment of 100mm in height and width).
• Variable coil casing and drain pan material.
• Variable fan selection including forward-curved, backward curved, and airfoil, with AC/EC plug fans.
• Variable frequency drive (VFD) and thermistor options.
• Multiple section depth options.

High Quality Thermal Break Profile

Constructed of two parts of extruded aluminum joined by a thermal barrier nylon strip. This profile is designed to meet BS EN 1886, Class TB2. The thermal break profile is available for cabinets with 50mm thickness.

Benefits:

• Increased Energy Efficiency.
• Minimized unit condensation.
• Elimination of moisture migration into the panel interior, preventing degradation of insulation.
• Improved sound insulation.

Better Air Flow Quality

High-quality and reliable Primary, Secondary, and HEPA filters are available for air filtration. Activated carbon filters are also available to improve indoor air quality by removing common urban contaminants like VOCs, SOx, NOx, and Ozone.

Mechanical Specifications

Coil

• Constructed with aluminum corrugated fins and seamless copper tubes.
• Optional copper fins and hydrophilic fins are available as anti-corrosive materials.
• Optional Ultraviolet Germicidal Irradiation (UVGI) Lamps are available for eradicating germs in cooling coils and drain pans.
• Coils are designed based on application requirements.

Motor

• Internally mounted integral to an isolated fan assembly.
• Various pole options (2, 4, 6, and 8 poles) are available for desired operation speed.
• Motor Options: 380-415 Volt / 3 phase/ 50 Hz (standard), 230/380/440 Volt/ 3 phase/60Hz, Motor efficiency from IE1, IE2, IE3 up to IE4 (EC motor), Dual speed motor, Motor with space heater & Thermistor, Explosion / Flame proof.

Fan

• Fan selection includes forward, backward, airfoil wheel fans, and twin fans with double width double inlet (DWDI) centrifugal fans.
• Fan blades are constructed of galvanized steel.
• Fan performance is tested and measured in accordance with AMCA 210.
• Sound level is measured and rated in accordance with AMCA Standard 300.
• Fans are dynamically and statically balanced to Standard ISO 1940.
• Fan bearings have a minimum L50 life of 200,000 hours, with an option for 1,000,000 hours.

Spring or Rubber Isolator

Spring or rubber isolators are mounted between the fan compartment and the rest of the AHU to prevent noise and vibration transmission.

• Types of isolators: Rubber mounting (for blower ≤ model 355), 25mm deflection spring (for blower > model 355).

Optional Add-Ons

VFD/Frequency Inverter

• VFD is used in electro-mechanical drive systems to control motor speed and torque by varying input frequency and voltage.
• Provides protection for motor operation.
• Allows frequency variation within 30Hz to 60Hz to control motor rotation in AHU.

Heat Recovery Wheel

• Constructed of aluminum coated with heat transfer material (silica gel or others), rotated by an electric motor at constant or variable speed.
• Reduces ventilation equipment capacity.
• Can operate at lower temperatures without frosting.
• Recovers both latent and sensible heat, reducing system capacity by 30% to 65%.
• Helps prevent sick building syndrome.

Mixing Box

• An air inlet section to mix fresh and return air as per system designer's requirement.
• Consists of dampers with opposed rotating blades and a driving shaft.
• Damper blades are fabricated of aluminum with continuous Thermoplastic Elastomer (TPE) seals.
• The rotated rod of the handle is made of brass, and the handle is fabricated of aluminum casting.

Sound Attenuator

• Features a perimeter galvanized steel frame.
• Various attenuator lengths are available to meet stringent sound attenuation requirements.

Humidifier

• An electric device to increase air relative humidity without a steam source.
• It is a constant temperature humidifier.
• Regulates generated steam by controlling water level and electrical current.

Electrical Heater

• Optional electric heaters available in single-step or multi-step heating processes.
• Heaters are available in 220-230V, with wiring configurable for single-phase or three-phase control.

EC Fan Electronically Commutated Fan

Acson Air Handling Units can be fitted with EC Plug Fans, offering better efficiency, lower noise emission, and a compact, robust design. Suitable for models with total static pressure of 1800Pa and below.

Nominal Data

Benefits of Using Acson EC Solution

1. Universal Usage
2. Better lead time compared to ordinary Plug Fan
3. Premium Efficiency IE4 Motor
4. Modbus Integrated
5. Great Cost Savings
6. AHU Section Length Savings
7. High End Technology
8. Fan Array Capability
9. Simple Installation & Commissioning
10. Speed Control

Solutions to Your Fan Woes

EC Fan (Our Solution): Diagram illustrating EC Fan setup.

Fan+Motor+VFD (Conventional Fan Solution): Diagram illustrating conventional fan setup with VFD.

Why EC Fan

• Save on Installation Cost
• Save on Space
• Save on Components (No Inverter, No Sine Filter, No Shielded Cable, No Premium Motor, No Motor Protection)

EC Plug Fan

Fan Array Air Flow Range

Table detailing Fan Array Air Flow Range, Air Flow Rate, Input Power, and Watts/CMH for various configurations.

Specifications

Table detailing specifications for different fan array configurations, rated at static pressure 1200 Pa.

Quick Air Filter Selection Guide

Classification as per ISO 16890

Table 1: Filtration Class for Coarse filters

Classification as per ISO 16890

Table 2: Filtration Class for fine filters

Classification as per EN 1822

Table 3: Filter Efficiency for EPA & HEPA Filters Class E10-H14

An optional filter pressure gauge can be added for regular filter servicing and to indicate filter life span.

Hygienic Grade Double Skin Modular Air Handling Unit

The Acson Hygienic Grade Double Skin Modular Air Handling Unit, DMA6H(A), is designed for healthy air quality, comfortable environment, and energy efficiency. It meets stringent requirements for indoor air quality, operating efficiency, sound level, and installation. Manufactured with 60mm thick double skin panels and CFC-free polyurethane foam insulation, it features a high-strength rigid sealed frame construction to minimize leakage.

Nomenclature

The nomenclature for Hygienic Grade AHUs includes:

• A: Acson
• DM: Double Skin Modular
• A: Model designation
• 6: 60mm thickness
• H: Hygienic Meet
• XX: Unit Model Height (e.g., VD16022-2, VD13803-1, DIN1946-4)
• YY: Version
• (A): Double Skin Modular

Example: ADMA6H-1315(A) AHU with double skin 60mm thickness, hygienic with cabinet height 1760mm, cabinet with 1960mm.

The DMA6H(A) modular AHU meets AHRI 1350, EN1886:2003, VDI 6022-2, VDI 3803-1, and DIN 1946-4 standards.

Features

Maximum Flexibility

Selection software is available for DMA6H(A) to optimize arrangement and performance according to hygienic requirements. Components can be selected and placed according to customer needs. Variable dimension features allow for flexible cabinet sizing (increment of 100mm in height and width).

Frame

• High-strength extruded aluminum alloy in a twin box section profile for stability and low weight.
• Constructed of two parts of extruded aluminum joined with a thermal barrier nylon strip to minimize thermal energy release.
• Smooth radius (round edge) design for easy maintenance and prevention of dust trapping and bacterial growth.
• Double Skin panels feature an inner skin of stainless steel and an outer skin of pre-painted metal with 40kg/m³ density polyurethane foam insulation.
• Panels are fully removable and equipped with endless PU gasket.
• Access doors have nylon dual handles and cam locks, with double glazed viewing port holes.

EC Plug Fan

Offers better efficiency, lower noise emission, and a compact, robust design. Direct drive eliminates belt abrasion, meeting VDI6022-1 recommendations. EC fans do not require flexible canvas and rubber isolators, preventing mold and fungus growth.

Heat Exchanger

• Easy coil removal by sliding.
• Easy coil cleaning with limitations on the number of rows and fin per inch selection.
• Uses Anti-Corrosion Casing Stainless Steel Material.
• Remarks: Cooling Coil Face velocity should be kept below 2.5m/s to ensure no water carry over.

Filters

Meet VDI6022-1 & VDI3803-1 standards, requiring minimum M5 grade filters at the air intake and minimum F7 grade filters at the final stage of the AHU.

Other Components Selection

• Heat Recovery
• Sight Glass (View Port)
• Hygienic Sealant
• Foam/Gasket compliance to VDI6022
• Optional for Antimicrobial Paint
• Volume Control Damper Compliance to

Standard Units Quick Selection Table

A. Return Air

Tables providing detailed specifications for Return Air units with 4-Rows Cooling Coil and 1-Row Heating Coil, including Unit Size, Air Flow, ESP, S.C, T.C.C, Off Coil (°C), Water flow, WPD, Motor kW, and Circuit for various models.

B. Fresh Air

Tables providing detailed specifications for Fresh Air units with 4-Rows Cooling Coil and 1-Row Heating Coil, including Unit Size, Air Flow, ESP, S.C, T.C.C, Off Coil (°C), Water flow, WPD, Motor kW, and Circuit for various models.

Outline and Dimension

A. Horizontal Typical Configuration

Diagrams illustrating horizontal typical configurations (Type 1 & 2).

Table 1: Horizontal Typical Configuration Type 1 & 2 - Provides dimensions (Height, Width, Length) for various models.

B. Horizontal Typical Configuration

Diagrams illustrating horizontal typical configurations (Type 3 & 4).

Table 2: Horizontal Typical Configuration Type 3 & 4 - Provides dimensions (Height, Width, Length) for various models.

C. Vertical Type Configuration

Diagrams illustrating vertical typical configurations (Type 1 & 2).

Table 3: Vertical Typical Configuration Type 1 & 2 - Provides dimensions (Width, Length) for various models.

D. Vertical Type Configuration

Diagrams illustrating vertical typical configurations (Type 3 & 4).

Table 4: Vertical Typical Configuration Type 3 & 4 - Provides dimensions (Width, Length) for various models.

Filter Specification

Standard AHU Filter (Primary & Secondary Filter)

Tables detailing Filter Media Size and Quantity for Sliding / Universal Filter frame, showing Qty and Area (m²) for 24"x24", 20"x24", 16"x24", and 12"x24" sizes, along with Total Area (m²).

HEPA Filter Specification

Tables detailing HEPA Filter Size c/w Frame and Quantity / unit, showing Qty and Area (m²) for various sizes and Total Area (m²).

Company Information

ACSON MALAYSIA SALES & SERVICE SDN.BHD. is a member of DAIKIN group.

Address: No. 7A, Jalan 13/4, Seksyen 13, 46200 Petaling Jaya, Selangor Darul Ehsan, MALAYSIA.

Contact:

• Tel: +603 7964 8200
• Sales Fax: +603 7956 9909
• Service Fax: +603 7956 9907
• Acson Careline: 1300 22 3344

Branch Contacts: Penang, Perak, Melaka, Johor, Pahang, Kelantan, Sarawak, Sabah.

Website: www.acson.com.my

Certifications:

• AHRI CERTIFIED® (www.ahridirectory.org)
• EUROVENT CERTIFIED PERFORMANCE (www.eurovent-certification.com)