AIR HANDLERS Central Station (CS3) (Modular AL Frame AHU) Roof Mounted (RT)
CONTENTS 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
1. CS3 AL Frame AHU : Unit Types Available casing thickness: nominal 1 & 2 1. Horizontal Wide range of sizes 1 Casing: Nom. CFM 1,200 24,000 2 Casing: Nom. CFM 1,200 52,000 2. Vertical Small footprint for maximum space utilization 1 Casing: Nom. CFM 1,200 15,000 2 Casing: Nom. CFM 1,200 24,000 3. Multi-Zone Blow Through Dampers blend hot- and cold-deck temperatures to produce a desired temperature for individual zone 1 Casing: Nom. CFM 2,200 15,000 2 Casing: Nom. CFM 2,200 24,000
1. CS3 AL Frame AHU : Certification The CS3 range is : AHRI 430 certified for 50Hz & 60Hz models ETL listed for 60Hz models
2. Casing Structure Manufactured from extruded aluminium profile with strong nylon corners Double skin sandwich panel injected with polyurethane foam (PU) of 40kg/m 3 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. Rigid PVC Strip
2. Casing Structure Modular Design 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 Sample Unit, AHD64: (Mixing Box+ Flat & Bag Filter Sections) (Coil + Fan Sections) Module length 1 = 3+3 = 6 Module length 2 = 4+5 = 9
2. Casing Structure Modular Design 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 = 1250mm Unit length 2 = (9 x 200)+ 50 = 1850mm
2. Casing Structure - Access Access panels are easily removable by air tight screwed compression latch. Lift-up type and hinged-type access doors are also available Hinge Air tight screwed compression latch
2. Casing Structure Section Joining Site Assembly All modular sections are supplied with joining brackets Easy alignment at site and locked together with factory supplied bolts and nuts GASKET SECTION SECTION
3. Blowers and Drives Two types of DIDW centrifugal fans available which are AMCA certified Forward Curved Fan Airfoil Fan Choice for Class I/II blowers to meet required conditions Forward Curved Fan Suitable for low to medium pressure airhandling applications Advantages: low cost, low speed Airfoil Fan Suitable for higher static pressure applications Advantages: high efficiency, stronger structure
3. Blowers and Drives - Assembly 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 All blowers are statically and dynamically balanced. After complete assembly the wheel is balanced to the lower vibration Shipping bracket Rubber of Spring isolators
4. Coils 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 - Construction 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 Drain Pan 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
5. Options and Accessory Sections AHU may consist of a number of factory fabricated sections assembled in a variety of arrangements Mixing Box Section Flat & Bag Filter Section Coil Section Blower Section
5. Options and Accessory Sections Mixing Box 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 - Filters 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 Disposable prefilter Rigid secondary filter Bag filter HEPA filter
5.4 Moisture Eliminator 5. Options and Accessory Sections 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)
5.5 Silencer 5. Options and Accessory Sections Silencer Slide 19 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
6. RT Roof Mounted Air Handlers Designed specifically for rooftop installation Single piece modular design with model sizes handling 2,000 28,800CFM Features Top pitched roofing design Weatherproof cabinet construction Unit base rail construction for roof curb installation
6. RT Roof Mounted Air Handlers - Certification The RT range is : AHRI 430 certified ETL listed
6. RT Roof Mounted Air Handlers Top Pitched Roofing Raised flanges with gasketing to protect seams between roof panels Sealer strip Raised flanges 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. 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 Outer Door Frame with gasket Inner Door Frame
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 Rail Factory designed unit base rail permits adaptation to roof curb site installation by others Typical Roof Curb (by others)
7. Selection Program Electronic Catalog (SPEC 7) 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) Sample Print-Out
8. Air Handlers for Special Applications ENERGY RECOVERY UNIT : Heatwheel Application AHU with built-in Heat Recovery Wheel to accomplish precool of fresh air to reduce cooling capacity EXHAUST AIR RETURN AIR FRESH AIR SUPPLY AIR
STACKED CONFIGURATION
Plate heat exchanger
8. Air Handlers for Special Applications ENERGY RECOVERY UNIT : Heatpipe Application AHU with built-in Heatpipe to accomplish reheat while also reducing cooling capacity (precool) WARM & HUMID PRE- COOLED OVER COOLED DRY & COMFORTABLE
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)