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STATEMENT OF WORK
AND TECHNICAL ORDERING SPECIFICATIONS
FOR THE PURCHASE
OF THREE (3 QTY.) INDUSTRIAL CEILING FANS
AND INSTALLATION OF FANS AND ONE FAN MOTOR IN BUILDING 202
| 1. | SALIENT CHARACTERISITICS: The industrial ceiling fans will have the following salient characteristics: |
| 1.1. | Three (3 qty.) Complete Units: |
| 1.1.1. | Dimensions: |
| 1.1.1.1. | 2 qty. 18’ fan assemblies |
| 1.1.1.2. | 1 qty. 14’ fan assembly |
| 1.1.2. | Clearance: |
| 1.1.2.1. | 2 ft. clearance on sides |
| 1.1.2.2. | 6 ft. clearance below ceiling |
| 1.1.3. | Regulatory Requirements: |
| 1.1.3.1. | The entire fan assembly shall be Intertek/ETL-certified and built pursuant to the construction guidelines set forth by UL standard 507 and CSA standard 22.2 No. 113. |
| 1.1.3.2. | The controller shall be compliant with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) The device may not cause harmful interference, and (2) The device must accept any interference received, including interference that may cause undesirable operation. |
| 1.1.4. | Sustainability Characteristics: |
| 1.1.4.1. | The fan shall be designed to move an effective amount of air for cooling over an extended life. The fan components shall be designed specifically for high volume, low speed fans to ensure lower operational noise. Sound levels from the fan operating at maximum speed measured in a laboratory setting shall not exceed 55 dBA. Actual results of sound measurements in the field may vary due to sound reflective surfaces and environmental conditions. |
| 1.1.5. | Good workmanship shall be evident in all aspects of construction. Field balancing of the airfoils shall not be necessary. |
| 1.2. | Control system: |
| 1.2.1. | The onboard fan controller shall be constructed using a variable frequency drive (VFD) that is pre-wired to the motor and factory-programmed to minimize the starting and braking torques for smooth and efficient operation. The onboard controller shall be prewired to the motor using a short run of flexible conduit with a dedicated ground conductor to minimize electromagnetic interference (EMI) and radio frequency interference (RFI). A 15-ft incoming power cord shall be pre-wired to the controller with one of the following plugs: NEMA L6-20P Twist-Lock Plug, NEMA L6-30P Twist-Lock Plug, NEMA L15-20P Twist Lock Plug, NEMA L16-20P Twist-Lock Plug. |
| 1.3. | Airfoil System: |
| 1.3.1. | The fan shall be equipped with eight (8) airfoils of precision extruded aluminum alloy. The airfoils shall be connected by means of two (2) high strength locking bolts per airfoil. The airfoils shall be connected to the hub and interlocked with zinc plated steel retainers. |
| 1.4. | Airfoil Restraint System: |
| 1.4.1. | All fans shall be equipped with an airfoil restraint system to provide redundant safety between the ends of the airfoils and the fan hub. |
| 1.4.2. | The airfoil restraint system shall be comprised of durable, lightweight nylon safety straps that shall extend from winglets through the airfoils and secure to the fan hub with 12-gauge stamped steel safety clips. |
| 1.4.3. | The straps shall be made of 1 in. (24 mm) wide heavy-duty nylon webbing rated for 825 lb (374 kg). The loops at the ends of the straps shall be secured in a double-stitch pattern for reinforced durability. |
| 1.4.4. | The straps shall be precisely matched to each fan’s diameter, eliminating the need for a tensioning mechanism and reducing opportunity for noise. |
| 1.4.5. | The straps shall run along the inside of the airfoils for an uninterrupted look. |
| 1.4.6. | Safety clips shall secure to each winglet to comprise the outer anchor points and provide tension, while clips on the opposite end shall secure to threaded inserts incorporated in the fan hub. |
| 1.5. | Motor: |
| 1.5.1. | The fan motor shall be an AC induction type inverter rated at: |
| 1.5.1.1. | Speed: 1725 RPM |
| 1.5.1.2. | Required Power Supply: 480 VAC, 60 Hz, three-phase |
| 1.5.1.3. | Power output: 2 HP |
| 1.5.2. | The motor shall be totally enclosed, fan cooled (TEFC) with an IP44 NEMA classification. A NEMA 56C standard frame shall be provided for ease of service. The motor shall be manufactured with a double baked Class F insulation and be capable of continuous operation in 32°F to 122°F (0°C to 50°C) ambient conditions. |
| 1.5.3. | The motor shall have a C-face attachment that shall enable technicians to detach the motor for easy field service. The C-face motor adapter shall be designed to work with the gearbox. |
| 1.6. | Gearbox: |
| 1.6.1. | Gearbox: Nitrogen filled and hermetically sealed to prevent contaminants for zero maintenance, corrosion resistance, and reduced heat buildup for longer life. |
| 1.6.2. | The gearbox shall include a high-efficiency, hermetically sealed, nitrogen-filled, offset helical gear reducer with two-stage gearing, a hollow output shaft, cast iron housing, double lip seals, high quality bearings. Lubrication shall be high-grade, low-foaming synthetic oil with extreme pressure additives and a wide temperature range and shall be lubricated for the life of the product (no oil changes required). |
| 1.7. | Mounting Post: |
| 1.7.1. | The fan shall be equipped with a mounting post that provides a structural connection between the fan assembly and extension tube. The mounting post shall be formed from A36 steel, contain no critical welds, and be powder coated for corrosion resistance and appearance. |
| 1.8. | Mounting System: |
| 1.8.1. | The fan mounting system shall be designed for quick and secure installation on a variety of structural supports. The design of the upper mount shall provide two axes of rotation. This design shall allow for adjustments to be made after the mount is installed to the mounting structure to ensure the fan will hang level from the structure. |
| 1.8.2. | The upper mount shall be of ASTM A-36 steel, at least 3/16” thick, and powder coated for appearance and corrosion resistance. No mounting hardware or parts substitutions, including cast aluminum, are acceptable. |
| 1.8.3. | All mounting hardware shall be SAE Grade 8 or equivalent. |
| 1.9. | Hub: |
| 1.9.1. | The fan hub shall be 19” (48 cm) in diameter and shall be made of precision cut aluminum for high strength and light weight. The hub shall consist of two (2) aluminum plates, eight (8) aluminum spars, and one (1) aluminum spacer fastened with a pin and collar rivet system. The overall design shall provide a flexible assembly such that force loads experienced by the hub assembly shall be distributed over a large area to reduce the fatigue experienced at the attachment point for the fan blade. |
| 1.9.2. | The hub shall be secured to the output shaft of the gearbox by means of ten (10) high strength bolts. The hub shall incorporate four (4) safety retaining clips made of 1/4” (0.6 cm) thick steel that shall restrain the hub/airfoil assembly. |
| 1.10. | Safety Cables: |
| 1.10.1. | The fan shall be equipped with an upper safety cable that provides an additional means of securing the fan assembly to the building structure. The upper safety cable shall have a diameter of Ø3/8” (1 cm). |
| 1.10.2. | The fan shall be equipped with two lower safety cables pre-attached to the fan hub that shall provide an additional means of securing the fan to the extension tube. The lower safety cables shall have a diameter of 1/4” (0.6 cm). |
| 1.10.3. | The safety cables shall be fabricated out of 7 x 19 galvanized steel cable. |
| 1.10.4. | Field construction of safety cables is not permitted. |
| 1.11. | Digital Variable Speed Wall Controller: |
| 1.11.1. | The fan shall be equipped with a digital variable speed wall controller. The user interface shall be an intuitive touchscreen interface. |
| 1.11.2. | The controller shall be mounted to a standard rectangular or square outlet box. |
| 1.11.3. | A 150-ft (45.7-m) CAT5 cable shall be provided for connecting the controller to the fan’s VFD and to provide power to the controller. |
| 1.11.4. | The controller mounting location shall meet the requirements of OSHA standard 29 CFR 1910.303(g) for accessibility minimum clearances. |
| 1.11.5. | The controller shall have an IP55 rating. |
| 1.11.6. | The controller shall provide fan start/stop, speed, and direction control functions. |
| 1.11.7. | The controller shall provide diagnostic and fault history information for the connected fan, as well as the ability to configure fan parameters. |
| 1.11.8. | The controller interface shall be able to be secured with a passcode to prevent unauthorized access to fan controls and settings. |
| 1.11.9. | The controller shall operate out of the box without setup and upon connection to CAT5 cable. |
| 1.12. | Airfoils: |
| 1.12.1. | 2 ft. clearance on sides |
| 1.12.2. | 6 ft. clearance below ceiling |
| 1.12.3. | Minimum eight airfoils |
| 1.13. | Maximum operating temperature: Max 125°F (50°C) |
| 1.13.1. | Mounting: Standard upper mount installs to I-beams and bar joists |
| 1.13.2. | Optional kits allow for mounting to solid beams and purlins |
| 1.14. | Safety features: Double safety cable system, airfoil retainers, hub safety clips, Grade 8 hardware, guy wires, and airfoil restraint system |
| 2. | PERFORMANCE: |
| 2.1. | This scope covers the requirements for the installation of industrial ceiling fans in Building TBD. |
| 2.2. | Contractor shall contact: TBD before delivering equipment for scheduling purposes. |
| 2.3. | Second Point of Contact for Norfolk Naval Shipyard: TBD |
3. PERIOD OF PERFORMANCE: August 10, 2021 – October 31, 2021
| 4. | CONTRACTOR RESPONSIBILITIES: |
| 4.1. | PREPARATION |
| 4.1.1. | Fan location shall have a typical bar joist or existing I-beam structure from which to mount the fan. Additional mounting options may be available. |
| 4.1.2. | Mounting structure shall be able to support weight and operational torque of fan. Contractor shall consult a structural engineer if necessary. |
| 4.1.3. | Fan location shall be free from obstacles such as lights, cables, or other building components. |
| 4.1.4. | Contractor shall check fan location for proper electrical requirements. |
| 4.1.5. | Each fan requires dedicated branch circuit protection. |
| 4.1.6. | Before the controller is installed, the fan system shall be installed by a factory-certified installer according to the instructions in the fan Installation Guide. |
| 4.1.7. | The installer shall install a rectangular or square outlet box at the controller mounting location. |
| 4.2. | FAN INSTALLATION: |
| 4.2.1. | The contractor shall provide all lifting and handling services. |
| 4.2.2. | The contractor shall provide any necessary lead abatement services. |
| 4.2.3. | The fan shall be installed by a factory-certified installer according to the manufacturer’s Installation Guide, which includes acceptable structural dimensions and proper sizing and placement of angle irons for bar joist applications. The contractor shall consult a structural engineer for installation methods outside the manufacturer’s recommendation and a certification, in the form of a stamped print or letter, submitted prior to installation. |
| 4.2.4. | Airfoils shall be at least 10 ft (3.05 m) above the floor. |
| 4.2.5. | Installation area shall be free of obstructions such as lights, cables, sprinklers, or other building structures with the airfoils at least 2 ft (0.61 m) clear of all obstructions. |
| 4.2.6. | The fan shall not be located where it will be continuously subjected to wind gusts or in close proximity to the outputs of HVAC systems or radiant heaters. |
| 4.2.7. | Mount the controller to a flat, readily accessible surface that is free from vibration and away from foreign objects and moving equipment. The controller mounting location must meet the requirements of OSHA standard 29 CFR 1910.303(g) for accessibility minimum clearances. |
| 4.2.8. | The contractor shall run the electrical lines up from the ventilation system up to NNSY breaker panels but shall not make the final connection into the panel. |
| 4.2.9. | After the final connection of the electrical lines to NNSY utilities by NNSY technicians, the contractor shall start-up and test the fans. |
| 4.2.10. | The contractor shall provide training to NNSY personnel on the operation of the controller. |
| 4.3. | REPLACEMENT MOTOR INSTALLATION: |
| 4.3.1. | The contractor shall remove the existing motor near Column C8 and replace this motor with a new fan motor. |
| 4.3.2. | The contractor shall perform an operational test of the fan motor. |
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