AIR HANDLERS

Central Station (CS3)(Modular AL Frame AHU)

Roof Mounted (RT)

1. CS3 Modular Aluminium Frame AHU : Unit Types

2. Casing Structure

3. Blowers and Drives

4. Coils

5. Options and Accessory Sections

6. RT Roof Mounted Air Handlers

7. Selection Program – Electronic Catalog (SPEC 7)

8. Air Handlers for Special Applications

CONTENTS

1. CS3 AL Frame AHU : Unit Types

1” Casing: Nom. CFM 1,200 – 24,0002” Casing: Nom. CFM 1,200 – 52,000

1. Horizontal

2. Vertical

3. Multi-Zone Blow Through

1” Casing: Nom. CFM 1,200 – 15,0002” Casing: Nom. CFM 1,200 – 24,000

1” Casing: Nom. CFM 2,200 – 15,0002” Casing: Nom. CFM 2,200 – 24,000

Small footprint for maximum space utilization

Wide range of sizes

Dampers blend hot- and cold-deck temperatures to produce a desired temperature for individual zone

Available casing thickness: nominal 1” & 2”

The CS3 range is : AHRI 430 certified for 50Hz & 60Hz models

ETL listed for 60Hz models

1. CS3 AL Frame AHU : Certification

• Manufactured from extruded aluminium profile with strong nylon corners

• Double skin sandwich panel injected with polyurethane foam (PU) of 40kg/m3

density, giving smooth inner surfaces for easy cleaning.

• Internal joints are insulated with rigid PVC strip and PE foam to provide air-tight casing and minimize cold bridging.

• External panels are coated with powder paint to provide excellent finish and corrosion resistance

• Aluminium frame results in lighter Unit Casing Weight.

2. Casing Structure

Rigid PVC Strip

• Total MODULAR design casing gives complete unit arrangement flexibility

• Shipping options available of single-piece shipment or shipment in sections

• Can also be separated to knock-down form (CKD) for shipment

Module length 1 = 3+3 = 6 Module length 2 = 4+5 = 9

2. Casing Structure – Modular Design

Sample Unit,AHD64: (Mixing Box+ Flat & Bag Filter Sections)(Coil + Fan Sections)

Total MODULAR design, 1M = 200mm

Sample calculation of unit size

Unit height = (5 x 200)+ 50 + 100 = 1150mm (includes unit base)

Unit width = (10 x 200)+ 50 = 2050mm

Unit length 1 = (6 x 200)+ 50 = 1250mmUnit length 2 = (9 x 200)+ 50 = 1850mm

2. Casing Structure – Modular Design

• Access panels are easily removable by air tight screwed compression latch.

• Lift-up type and hinged-type access doors are also available

HingeAir tight screwed

compression latch

2. Casing Structure - Access

Site Assembly

• All modular sections are supplied with joining brackets• Easy alignment at site and locked together with factory supplied bolts and nuts

SECTION

SECTION

GASKET

2. Casing Structure – Section Joining

Two types of DIDW centrifugal fans available which are AMCA certified• Forward Curved Fan• Airfoil FanChoice for Class I/II blowers to meet required conditions

Forward Curved Fan• Suitable for low to medium pressure air-

handling applications• Advantages: low cost, low speed

Airfoil Fan• Suitable for higher static pressure

applications• Advantages: high efficiency, stronger

structure

3. Blowers and Drives

• Complete assembly of fan, motor and drive is mounted on a common base with internally mounted vibration isolators (rubber or spring according to model size)

• Standard TEFC motors with class F insulation (IEC or Nema)

• Fire retardant flexible duct connector is provided to minimize transmission of vibration to unit casing

• Rigid shipping brackets installed to prevent damage during shipping

Flexible connection

Rubber of Spring isolatorsShipping bracket

All blowers are statically and dynamically balanced. After complete assembly the wheel is balanced to the lower vibration

3. Blowers and Drives - Assembly

• Corrugated fins and staggered tube configuration• Full collar aluminum fins bonded to seamless copper tubes by

mechanical expansion• Fin material options: Aluminium, Copper or Hydrophilic type• Counter flow arrangement

Coils(5/8 tube dia, Type 5) are certified in accordance with AHRI Standard 410

4. Coils

• Galvanized steel casing• Steel pipe header, optional copper

header• MBSP threaded connection, optional

MNPT• Plugged vent on each header• Suitable for 250 psig working

pressure. • Tested under water with 350 psig

air pressure.

Other coil options,• DX coils• Steam coils

4. Coils - Construction

• galvanized steel sheet with powder painted

• V-shaped designed to provide positive pitch toward drain outlet and will not retain condensate within the pan.

• Minimize mold and bacteria growth

• Drain pipe of 1-1/2” MBSP as standard, optional for MNPT

• Stainless steel drain pan as optional

4. Coils – Drain Pan

Mixing Box Section

AHU may consist of a number of factory fabricated sections assembled in a variety of arrangements

5. Options and Accessory Sections

Flat & Bag Filter Section

Coil Section Blower Section

• Designed for efficient mixing of outside and return air by means of inter-connected dampers, motorized actuator as options

• Standard aluminium airfoil low leak dampers

5. Options and Accessory Sections –Mixing Box

Disposable prefilter Rigid secondary filter

HEPA filterBag filter

• Required for the removal of contaminants from the outside as well as the recirculated air

• Sections in flat, angle, bag filter arrangements

• Various filtration types. Different efficiency range to accommodate for different applications

5. Options and Accessory Sections - Filters

5.4 Moisture Eliminator

• Normally installed downstream of a humidifier or cooling coil• To remove droplets of water which might be entrained in the air stream due

to high coil face velocity (>550 FPM)

5. Options and Accessory Sections –Moisture Eliminator

Slide 195.5 Silencer

• Installed at either upstream or downstream of blower section

• Consist multiple silencer splitters containing perforated metal baffles filled with sound absorbing material

• Provided to reduce noise transmission

5. Options and Accessory Sections –Silencer

• Designed specifically for rooftop installation• Single piece modular design with model sizes handling

2,000 – 28,800CFMFeatures• Top pitched roofing design• Weatherproof cabinet construction• Unit base rail construction for roof curb installation

6. RT Roof Mounted Air Handlers

The RT range is : AHRI 430 certified

ETL listed

6. RT Roof Mounted Air Handlers - Certification

Top Pitched Roofing

• Raised flanges with gasketing to protect seams between roof panels

• Sealer strips pull roof flanges together

• Pitched both way to cabinet sides for rain water runoff

• 1 ½” roof overhang for rainwater flowing from unit top will not drip onto the door tops.

Sealer strip

Raised flanges

Roof overhang

6. RT Roof Mounted Air Handlers

Weatherproof Cabinet Construction• Cabinet made of galvanized steel and powder coated to provide excellent

weatherability and corrosion resistance passing 1000 hrs salt spray test• Cabinet made to remain water tight construction

Weather hood with moisture eliminator for outside air intakes

Double access door frames with gasket design with heavy duty latches to form the seal

Inner Door Frame

Outer Door Frame with gasket

6. RT Roof Mounted Air Handlers

6. RT Roof Mounted Air Handlers

Internal built-in pipe chase and piping vestibule for routing of coil piping inside the cabinet

6. RT Roof Mounted Air Handlers

Unit Base RailFactory designed unit base rail permits adaptation to roof curb site installation by others

Typical Roof Curb (by others)

6. RT Roof Mounted Air Handlers

For the ease of various unit sections and equipments selection, computer selection software is available for prompt and accurate equipment sizing.

7. Selection Program – Electronic Catalog (SPEC 7)

7. Selection Program – Electronic Catalog (SPEC 7) – Sample Print-Out

ENERGY RECOVERY UNIT : Heatwheel ApplicationAHU with built-in Heat Recovery Wheel to accomplish precool of fresh air to reduce cooling capacity

8. Air Handlers for Special Applications

RETURN AIR

FRESH AIR SUPPLY AIR

EXHAUST AIR

STACKED CONFIGURATION

Plate heat exchanger

WARM & HUMID

PRE-COOLED

OVERCOOLED

DRY & COMFORTABLE

ENERGY RECOVERY UNIT : Heatpipe ApplicationAHU with built-in Heatpipe to accomplish reheat while also

reducing cooling capacity (precool)

8. Air Handlers for Special Applications

8. Air Handlers for Special Applications

UNIT WITH PLENUM FAN

• Space limitations

• Need for discharge flexibility

• Duct configurations might change in the future

8. Air Handlers for Special Applications

All stainless steel casing unit

8. Air Handlers for Special Applications

• Unit with VFD application.

• Unit with UV light application.

• Return fan, economiser, etc.

• Switch Board with starter, disconnect switch, etc.

Thank you

Central Station (CS3)(Modular AL Frame AHU)

Roof Mounted (RT)