New North Pointe K-4 Campus Tomball Independent School District SECTION HVAC FANS

Transcription

1 SECTION CONDITIONS OF THE CONTRACT AND DIVISION 1, as applicable, apply to this Section. PART 1 - GENERAL 1.1 SUMMARY A. Provide complete, fully operational fans where indicated on Drawings. B. Section Includes: 1. Hooded propeller roof fans 2. Upblast centrifugal roof fans 3. Downblast centrifugal roof fans 4. Upblast centrifugal roof fans Grease exhaust 5. Centrifugal filtered supply fans 6. Inline Fans 7. Ceiling Mounted High Volume, Low Speed Fans C. Related Sections: 1.2 SUBMITTALS 1. Section HVAC Duct and Casings - Ducts: Product requirements for hangers for placement by this section. 2. Section Air Duct Accessories: Product requirements for duct accessories for placement by this section. 3. Coordinate work in this Section with Division 7. A. Provide line-by-line specification review annotated to certify compliance or deviation. B. Shop Drawings: Indicate size and configuration of fan assembly, mountings, weights, ductwork and accessory connections. C. Product Data: Submit data on each type of fan and include accessories, fan curves with specified operating point plotted, power, RPM, sound power levels for both fan inlet and outlet at rated capacity, electrical characteristics and connection requirements. D. Manufacturer's Installation Instructions: Submit fan manufacturer s instructions. E. Manufacturer's Certificate: Certify products meet or exceed specified requirements. 1.3 CLOSEOUT SUBMITTALS A. Operation and Maintenance Data: Submit instructions for lubrication, motor and drive replacement, spare parts list, and wiring diagrams. 1.4 QUALITY ASSURANCE A. Performance Ratings: Conform to AMCA 210 and bear AMCA Certified Rating Seal

2 B. Sound Ratings: AMCA 301, tested to AMCA 300, and bear AMCA Certified Sound Rating Seal. C. UL Compliance: UL listed and labeled, designed, manufactured, and tested in accordance with UL 705 and UL 762 for kitchen exhaust. D. Balance Quality: Conform to AMCA 204. E. Energy Recovery Unit Wheel Energy Transfer Rating: Meet ARI WARRANTY A. Furnish one (1) year manufacturer s warranty for fans. Warranty shall begin from date of Certificate of Substantial Completion. Warranty start date from shipment or start up will not be acceptable. B. The mechanical sub contractor is responsible for all interim warranty timelines from date of delivery to substantial completion. 1.6 EXTRA MATERIALS A. Furnish extra materials that match products installed and that are packaged with protective covering for storage and identified with labels describing contents. Spare materials shall be provided by equipment manufacturer and not by the installing mechanical contractor. PART 2 - PRODUCTS 1. Fan Belts: Two (2) sets for each belt-driven fan. 2.1 HOODED PROPELLER ROOF FANS B. Unit shall be a low profile, hooded, roof mounted, belt driven or direct drive, propeller supply ventilator. Coordinate drive with fan schedule on drawings. C. Fan shall be constructed in accordance with UL 705. Fan shall bear the AMCA certified ratings seal for air performance. D. Construction: The fan shall be of bolted and welded construction utilizing corrosion resistant fasteners. The motor, bearings and drives shall be mounted on a welded tubular steel power assembly. The power assembly shall be rigidly secured to the fan housing. The powder coated steel fan housing shall include a minimum 14 gauge base with integral spun venturi and continuously welded or application of butyl tape to inside of the curb cap for maximum leak protection. The fan shall be enclosed with a minimum 18 gauge galvanized steel hood bolted to the fan housing. The hood shall have a removable

3 top cap to allow unobstructed access to the motor and power assembly without removing entire hood. The fan outlet shall be protected from entry of foreign material by ½" x ½" galvanized steel screen. Unit shall bear an engraved aluminum nameplate and shall be shipped in ISTA certified transit tested packaging. E. Coating: All ungalvanized steel fan components shall be treated with an electrostatically applied, baked polyester powder coating. Each component shall be subject to a five stage environmentally friendly wash system, followed by a minimum 2 mil thick baked powder finish. Paint must exceed 1,000 hour salt spray under ASTM B117 test method. F. Propeller: Propeller shall be a high-efficiency fabricated steel design with blades securely fastened to a minimum 7 gauge steel hub. The hub shall be keyed and locked to the fan shaft utilizing two setscrews. Propeller shall be balanced in accordance with AMCA Standard , Balance Quality and Vibration Levels for Fans. G. Motor: Motor shall be heavy duty type with permanently lubricated sealed ball bearings and furnished at the specified voltage, phase and enclosure. H. Bearings: Bearings shall be designed and tested specifically for use in air handling applications. Construction shall be heavy duty regreasable ball type in a cast iron housing selected for a minimum L50 life in excess of 200,000 hours at maximum cataloged operating speed. I. Belts and Drives: Belts shall be oil and heat resistant, non-static type. Drives shall be precision machined cast iron type, keyed and securely attached to the wheel and motor shafts. Drives shall be sized for 150% of the installed motor horsepower. The variable pitch motor drive must be factory set to the specified fan RPM. J. Roof Curb:12 inch high of 18 gauge galvanized steel construction with continuously welded seams, built-in cant strips, 1-1/2 inch insulation, damper tray, hinged curb adapter for access to dampers, and factory installed nailer strip. Coordinate installation with Division 7. K. Accessories: 1. Motorized damper in damper tray of roof curb. Actuator shall be same voltage as motor in fan. Damper shall energize fan through integral end switch. 2. Disconnect Switch: Coordinate with Division 26. Provide factory wired disconnect switch on 120v motor only. Factory provided disconnect switches shall be rated for outdoor use. Three phase combination disconnect/starter shall be provided by Division Direct drive units shall be provided with motor speed control option. 2.2 UPBLAST CENTRIFUGAL ROOF FANS

4 B. Fan shall be a spun aluminum, roof mounted, belt driven or direct drive, upblast centrifugal ventilator. Coordinate drive with fan schedule on drawings. C. Fan shall be constructed in accordance with UL 705. Fan shall bear the AMCA certified ratings seal for air performance. D. Construction: The fan shall be of bolted and welded construction utilizing corrosion resistant fasteners. The spun aluminum structural components shall be constructed of minimum 16 gauge marine alloy aluminum, bolted to a rigid aluminum support structure. The aluminum base shall have sealed curb cap corners by continuous weld or application of butyl tape to inside of the curb cap for maximum leak protection. The windband shall have a rolled bead for added strength. A two piece top cap shall have stainless steel quick release latches to provide access into the motor compartment without the use of tools. An integral conduit chase shall be provided into the motor compartment to facilitate wiring connections. The motor, bearings and drives shall be mounted on a minimum 14 gauge steel power assembly, isolated from the unit structure with rubber vibration isolators. These components shall be enclosed in a weather-tight compartment, separated from the exhaust airstream. Lifting lugs shall be provided to help prevent damage from improper lifting. Unit shall bear an engraved aluminum nameplate and shall be shipped in ISTA certified transit tested packaging. E. Wheel: Wheel shall be centrifugal backward inclined, constructed of 100 percent aluminum, including a precision machined cast aluminum hub. Wheel inlet shall overlap an aerodynamic aluminum inlet cone to provide maximum performance and efficiency. Wheel shall be balanced in accordance with AMCA Standard , Balance Quality and Vibration Levels for Fans. F. Motor: Motor shall be heavy duty type with permanently lubricated sealed ball bearings and furnished at the specified voltage, phase and enclosure. G. Bearings: Bearings shall be designed and individually tested specifically for use in air handling applications. Construction shall be heavy duty regreasable ball type in a cast iron pillow block housing selected for a minimum L50 life in excess of 200,000 hours at maximum cataloged operating speed. H. Belts & Drives: Belts shall be oil and heat resistant, non-static type. Drives shall be precision machined cast iron type, keyed and securely attached to the wheel and motor shafts. Drives shall be sized for 150 percent of the installed motor horsepower. The variable pitch motor drive must be factory set to the specified fan RPM. I. Roof Curb: 12 inch high of 18 gauge galvanized steel construction with continuously welded seams, built-in cant strips, 1-1/2 inch insulation, damper tray, hinged curb adapter for access to dampers, and factory installed nailer strip. Coordinate installation with Division 7. J. Accessories: 1. Motorized damper in damper tray of roof curb. Actuator shall be same voltage as motor in fan. Damper shall energize fan through integral end switch. 2. Disconnect Switch: Coordinate with Division 26. Provide factory wired disconnect switch on 120v motor only. Factory provided disconnect switches shall be rated for outdoor use. Three phase combination disconnect/starter shall be provided by Division

5 3. Direct drive units shall be provided with motor speed control option. 2.3 DOWNBLAST CENTRIFUGAL ROOF FANS B. Fan shall be a spun aluminum, roof mounted, belt driven, downblast centrifugal ventilator. C. Fan shall be constructed in accordance with UL 705. Fan shall bear the AMCA certified ratings seal for air performance. D. Construction: The fan shall be of bolted and welded construction utilizing corrosion resistant fasteners. The spun aluminum structural components shall be constructed of minimum 16 gauge marine alloy aluminum, bolted to a rigid aluminum support structure. The aluminum base shall have sealed curb cap corners by continuous weld or application of butyl tape to inside of the curb cap for maximum leak protection. The windband shall have a rolled bead for added strength. A two piece top cap shall have stainless steel quick release latches to provide access into the motor compartment without the use of tools. An integral conduit chase shall be provided into the motor compartment to facilitate wiring connections. The motor, bearings and drives shall be mounted on a minimum 14 gauge steel power assembly, isolated from the unit structure with rubber vibration isolators. These components shall be enclosed in a weather-tight compartment, separated from the exhaust airstream. Lifting lugs shall be provided to help prevent damage from improper lifting. Unit shall bear an engraved aluminum nameplate and shall be shipped in ISTA certified transit tested packaging. E. Wheel: Wheel shall be centrifugal backward inclined, constructed of 100 percent aluminum, including a precision machined cast aluminum hub. Wheel inlet shall overlap an aerodynamic aluminum inlet cone to provide maximum performance and efficiency. Wheel shall be balanced in accordance with AMCA Standard , Balance Quality and Vibration Levels for Fans. F. Motor: Motor shall be heavy duty type with permanently lubricated sealed ball bearings and furnished at the specified voltage, phase and enclosure. G. Bearings: Bearings shall be designed and individually tested specifically for use in air handling applications. Construction shall be heavy duty regreasable ball type in a cast iron pillow block housing selected for a minimum L50 life in excess of 200,000 hours at maximum cataloged operating speed. H. Belts & Drives: Belts shall be oil and heat resistant, non-static type. Drives shall be precision machined cast iron type, keyed and securely attached to the wheel and motor shafts. Drives shall be sized for 150 percent of the installed motor horsepower. The variable pitch motor drive must be factory set to the specified fan RPM

6 I. Roof Curb: 12 inch high of 18 gauge galvanized steel construction with continuously welded seams, built-in cant strips, 1-1/2 inch insulation, damper tray, hinged curb adapter for access to dampers, and factory installed nailer strip. Coordinate installation with Division 7. J. Accessories: 1. Motorized damper in damper tray of roof curb. Actuator shall be same voltage as motor in fan. Damper shall energize fan through integral end switch. 2. Disconnect Switch: Coordinate with Division 26. Provide factory wired disconnect switch on 120v motor only. Factory provided disconnect switches shall be rated for outdoor use. Three phase combination disconnect/starter shall be provided by Division Direct drive units shall be provided with motor speed control option. 2.4 UPBLAST CENTRIFUGAL ROOF FANS - GREASE EXHAUST B. Unit shall be a low profile, hooded, roof mounted, belt driven or direct drive, propeller supply ventilator. Coordinate drive with fan schedule on drawings. C. Unit shall be constructed in accordance with UL 762. Fan shall bear the AMCA certified ratings seal for sound and air performance. D. Construction: The fan shall be of bolted and welded construction utilizing corrosion resistant fasteners. The aluminum base shall have sealed curb cap corners by continuous weld or application of butyl tape to inside of the curb cap for maximum leak protection. The windband shall have a rolled bead for added strength. A two piece top cap shall have stainless steel quick release latches to provide access into the motor compartment without the use of tools. An external wiring compartment to facilitate wiring connections. The motor, bearings and drives shall be mounted on a 14 gauge steel power assembly. These components shall be enclosed in a weather-tight compartment, separated from the exhaust airstream. A one (1) inch thick, three pound density foil back heat shield shall be utilized to protect the motor and drive components from excessive heat. Lifting lugs shall be provided to help prevent damage from improper lifting. Unit shall bear an engraved aluminum nameplate and shall be shipped in ISTA certified transit tested packaging. E. Wheel: Wheel shall be centrifugal backward inclined, constructed of 100 percent aluminum, including a precision machined cast aluminum hub. Wheel inlet shall overlap an aerodynamic aluminum inlet cone to provide maximum performance and efficiency. F. Motor: Motor shall be heavy duty type with permanently lubricated sealed ball bearings and furnished at the specified voltage, phase and enclosure

7 G. Bearings: Heavy duty regreasable ball type in a cast iron pillow block housing selected for a minimum L50 life in excess of 200,000 hours. H. Belts and Dives: Belts shall be oil and heat resistant, non-static type. Drives shall be precision machined cast iron type, keyed and securely attached to the wheel and motor shafts. Drives shall be sized for 150 percent of the installed motor horsepower. The variable pitch drive must be factory set to the specified fan RPM. I. Roof Curb: 12 inch high of 18 gauge galvanized steel construction with continuously welded seams, built-in cant strips, 1-1/2 inch insulation, damper tray, hinged curb adapter for access to dampers, and factory installed nailer strip. Coordinate installation with Division 7. J. Accessories: 1. Disconnect Switch: Coordinate with Division Direct drive units shall be provided with motor speed control option. 3. Gravity actuated back-draft damper with adjustable counter weight. 4. Provide minimum 10 tall vented curb extension. 5. Provide grease trap with drain connection. 6. Provide heat baffle. 7. Provide Clean-Out Port. 2.5 CENTRIFUGAL FILTERED SUPPLY FAN - KITCHEN HOOD B. Unit shall be a low profile, hooded, roof mounted, belt driven or direct drive, propeller supply ventilator. Coordinate drive with fan schedule on drawings. C. Description: Fan shall be a side intake, roof mounted, belt driven, centrifugal filtered supply fan. D. Fan shall be constructed in accordance with UL 705. Fan shall bear the AMCA certified ratings seal for air performance. E. Construction: The fan shall be of bolted construction utilizing corrosion resistant fasteners. Housing shall be minimum 18 gauge galvanized steel, bolted to a minimum 16 gauge steel fan base with pre-punched mounting holes. Unit shall be provided with an insulated top cover and 1" washable permanent aluminum filter. Internal blower and motor assembly shall be mounted on rubber vibration isolators. Unit shall bear an engraved aluminum nameplate and shall be shipped in ISTA certified transit tested packaging. F. Wheel: Wheel shall be DWDI centrifugal forward curved type, constructed of painted steel. Wheel shall be balanced in accordance with AMCA Standard , Balance Quality and Vibration Levels for Fans

8 G. Motor: Motor shall be heavy duty type with permanently lubricated sealed ball bearings and furnished at the specified voltage, phase and enclosure. H. Bearings: Bearings shall be permanently lubricated, sealed ball type selected for a minimum L50 life in excess of 200,000 hours at maximum cataloged operating speed. I. Belts and Drives: Belts shall be oil and heat resistant, non-static type. Drives shall be precision machined cast iron type, keyed and securely attached to the wheel and motor shafts. Drives shall be sized for 150% of the installed motor horsepower. The variable pitch motor drive must be factory set to the specified fan RPM. J. Roof Curb: 12 inch high of 18 gauge galvanized steel construction with continuously welded seams, built-in cant strips, 1-1/2 inch insulation, damper tray, hinged curb adapter for access to dampers, and factory installed nailer strip. Coordinate installation with Division 7. K. Accessories: 2.6 INLINE FANS 1. Motorized damper in damper tray of roof curb. Actuator shall be same voltage as motor in fan. Damper shall energize fan through integral end switch. 2. Disconnect Switch: Coordinate with Division 26. Provide factory wired disconnect switch on 120v motor only. Factory provided disconnect switches shall be rated for outdoor use. Three phase combination disconnect/starter shall be provided by Division Direct drive units shall be provided with motor speed control option. B. Fan shall be a duct mounted, centrifugal, belt driven or direct drive, inline type supply or exhaust ventilator. C. All fans shall bear the AMCA Certified Ratings Seal for both sound and air performance. D. Construction: The fan housing shall be of the square design constructed of heavy gauge galvanized steel and shall include square duct mounting collars. Fan construction shall include two removable access panels located perpendicular to the motor mounting panel. The access panels must be of sufficient size to permit easy access to all interior components. Each fan shall bear a permanently affixed manufacturer s nameplate containing the model number and individual serial number for future identification. E. Coating: For fans serving Natatoriums or corrosive environments provide epoxy coating on all inside and outside surfaces including fan wheel and pulley. F. Wheel: The fan wheels shall be centrifugal backward inclined, constructed o f aluminum and shall include a wheel cone carefully matched to the inlet cone for precise running tolerances. Wheels shall be statically and dynamically balanced

9 G. Motor: Motors shall be heavy duty ball bearing type, carefully matched to the fan load and furnished at the specified voltage, phase, and enclosure. Motor Pulleys shall be adjustable for system balancing. H. Bearings: Precision ground and polished shafts shall be mounted in permanently sealed, lubricated pillow block ball bearings. Bearings shall be selected for a minimum (L10) life in excess of 100,000 hours at maximum catalogued operating speed. I. Belts & Drives: Drives shall be sized for a minimum of 150% of driven horsepower. Pulleys shall be of the fully machined cast iron type, keyed and securely attached to the wheel and motor shafts. J. Accessories: 1. Disconnect Switch: Coordinate with Division 26. Provide factory wired disconnect switch on 120v motor only. Three phase combination disconnect/starter shall be provided by Division Gravity actuated back-draft damper with adjustable counter weight. 3. Direct drive units shall be provided with motor speed control option. 4. Companion Flanges: For inlet and outlet duct connections. 5. Fan Guards: 1/2 by 1-inch mesh of galvanized steel in removable frame. Provide guard for inlet or outlet for units not connected to ductwork. 6. Motor and Drive Cover (Belt Guard): Epoxy-coated steel. 2.7 CEILING MOUNTED HIGH VOLUME, LOW SPEED FANS 1. Big Ass Fans B. Construction: Fan shall be ETL certified and built pursuant to construction guidelines set forth by UL standards 507, 746C, 1004, 1917 and CSA standards 22.2 No. 4, 22.2 No. 17, 22.2 No. 113, 22.2 No. 100, 22.2 No The fan shall be designed to move an effective amount of air for cooling and destratification in commercial applications. The fan shall incorporate a direct drive system designed specifically for high volume, low speed fans to ensure silent operation. The sound levels from the fan operating at maximum speed shall not exceed 40 dba (measured 20 or below the blades and 20 or horizontally from the center of the fan). C. Air Foils: The fan shall be equipped with ten (10) high volume, low speed airfoils or precision extruded aluminum alloy. Each airfoil shall be of the high performance TEC design. The airfoils shall be connected by means of two (2) locking bolts per airfoil. The airfoils shall be connected to the hub and interlocked with stainless steel retainers. D. Winglets: The fan shall be equipped with ten (10) TEC winglets designed to redirect outward airflow into downward airflow, thereby enhancing the efficiency and effectiveness of the fan. The winglets shall be die cast aluminum. Winglets shall be attached at the tip of each airfoil. The standard color of the winglets shall be super durable black. E. Trim: The fan shall be equipped with trim inserts that nest between the hub and the inner edge of the foil. The trim inserts (10 each) shall provide a cleaner fit between the airfoils and the hub to help reduce the drag, turbulence and the noise. Trim inserts shall be black

10 F. Motor: The fan motor shall be a permanent magnet brushless motor rated for continuous operation at maximum speed with the capability of modulating the fan speed from 0-100% without the use of a gearbox or other mechanical means of control. The motor shall operate from any voltage ranging from VAC, 1 PH, 60 HZ, without requiring adapters or customer selection. The motor shall be non-ventilated, heat sink design with the capability of continuous operation in -40 to 131 F ambient conditions. G. Hub: The fan hub shall be a single precision permanent mold casting of aluminum alloy for high strength and light weight. The hub shall be precision machined to achieve a well balanced and solid rotating assembly. The hub shall incorporate ten (10) safety pins made from aluminum that will secure the hub/airfoil assembly in case of shaft failure. The pins shall be attached to the body of the hub using the bolts. H. Mounting System: The fan mounting system shall be designed for quick and secure installation from a structural support beam. All components in the mounting system shall be of welded construction using steel no less than 3/16 thick and be powder coated for appearance and resistance to corrosion. All mounting bolts shall be SAE Grade 8 or equivalent. As an option, mounting components may be colored; confirm with architect/owner. I. Safety Cables: The fan shall be equipped with upper and lower safety cables. The upper safety cable shall provide an additional means of securing the fan assembly to the building structure. The lower safety cable shall provide an additional means of securing the motor unit to the mounting system. All safety cables shall be 3/16 diameter and fabricated out of 7x19 stranded galvanized steel. The loops must be secured with swaged Nicopress fittings, pre-loaded and tested to 3,000 lb f. Field construction of safety cables in not permitted. J. Controller: The controller shall be incorporated into the fan assembly. The controller shall be factory programmed to minimize starting and breaking torques. The controller shall be housed in an enclosure to prevent accidental contact with the enclosed equipment and to prevent entry of unwanted substances. K. Wall Control: The fan shall be equipped with a remote wall control. The wall control shall be capable of mounting to a standard receptacle by means of a mounting plate (which shall be included with the wall mounted device). The wall controller shall be equipped with a 1.8 TFT-LCD screen and user interface for controlling the fans direction, operation and speed. Communication with the fan drive and controller shall be by a standard, commercially available CAT-5 (or higher) Ethernet cable that is field installed and provided by the installer. A 5 patch cable shall be provided to test and verify communication signals locally prior to connecting the remote connection cable. L. Warranty: The manufacturer shall replace any products or components defective in material or workmanship, free of charge to the customer (including all transportation charges). M. Accessories: 1. Provide clear lockable enclosure for wall controller with two sets of keys

11 PART EXAMINATION A. Verify roof curbs are installed and dimensions are as shown on shop drawings. 3.2 INSTALLATION A. Secure roof fans with cadmium plated steel lag screws to roof curb structure. B. Install power ventilators level and plumb. C. Install dampers in roof curb damper tray. D. Provide hinged curb adapter to permit access to dampers and duct connection. E. Install safety screen where inlet or outlet is exposed. F. Provide sheaves required for final air balance. G. Install units with clearances for service and maintenance. H. Label units according to requirements specified in Section "Identification for HVAC Piping and Equipment." 3.3 MANUFACTURER'S FIELD SERVICES A. Furnish services of factory trained representative for minimum of one (1) day to start-up, calibrate controls, and instruct Owner on operation and maintenance. 3.4 CLEANING A. Vacuum clean inside of fan cabinet. 3.5 DEMONSTRATION A. Demonstrate fan operation and maintenance procedures. 3.6 PROTECTION OF FINISHED WORK A. Do not operate fans until ductwork is clean, bearings are lubricated, and fan has been test run under observation. END OF SECTION