**November 21, 1997**

**Contract \# TW-0928**

**SPECIAL SPECIFICATION**

**SECTION 15860-S**

**[CENTRIFUGAL FANS]{.underline}**

[Page]{.underline}

[PART 1 - GENERAL]{.underline}

1.01 Description.. 2

1.02 Related Work.. 2

1.03 Quality Assurance.. 2

1.04 References.. 3

1.05 Submittals\... 3

1.06 Delivery, Storage, and Handling.. 4

1.07 Sequencing.. 4

1.08 Extra Material.. 4

[PART 2 - PRODUCTS]{.underline}

2.01 Acceptable Manufacturers.. 5

2.02 General Fan Requirements.. 5

2.03 Centrifugal and Tubular Centrifugal Fans.. 6

2.04 Motors.. 7

[PART 3 - EXECUTION]{.underline}

3.01 Inspection.. 10

3.02 Installation/Application/Erection\... 10

3.03 Field Quality Control.. 11

3.04 Adjusting and Cleaning.. 11

3.05 Commissioning\.... 11

3.06 Demonstration\... 12

**SPECIAL SPECIFICATION**

**SECTION 15860-S**

**[CENTRIFUGAL FANS]{.underline}**

[PART 1 - GENERAL]{.underline}

1.01 [DESCRIPTION]{.underline}

> A. This Section is for EF-1/-2 and RF-1/-2includes the following types
> of centrifugal fans:

1.  Centrifugal (EF-1/-2) fans with inertia pads (See attached drawings
    for maximum dimensions of the inertia pad.) with their variable
    frequency drives (VFD) for indoor installations.

2.  Tubular centrifugal (RF-1/-2) fans for horizontal indoor
    installations.

1.02 [RELATED WORK]{.underline}

> A. Section 01300-S
>
> B. Section 13943-S
>
> C. Section 15010-S
>
> D. Section 15200-S

E.  Section 15901-S

F.  Division 16 Section \"Circuit and Motor Disconnects\" for disconnect
    switches.

> G. Division 16 Section \"Motor Controllers\" for motor starters.
>
> H. Division 16 Section \"Motor Control Centers\" for starters and
> fusible switches.

1.03 [QUALITY ASSURANCE]{.underline}

> A. Provide motors and electrical accessories that comply with National
> Electrical Manufacturers Association (NEMA) standards.
>
> B. Provide components according to National Fire Protection
> Association (NFPA) 70 \"National Electrical Code.\"

1.04 [REFERENCES]{.underline}

> A. Anti-Friction Bearing Manufacturers Association (AFBMA) Standard 9
> for ball bearings
>
> B. AFBMA Standard 11 for roller bearings
>
> C. Air Movement Contractors Association (AMCA) Standard 210/American
> Society of Heating, Refrigerating, and Air-Conditioning Engineers
> (ASHRAE) Standard 51, Laboratory Methods of Testing Fans for Rating
>
> D. AMCA Standard 300, Test Code for Sound Rating
>
> E. AMCA Standard 301, Method for Calculating Fan Sound Ratings From
> Laboratory Test Data
>
> F. American Society for Testing and Materials (ASTM) A36
>
> G. ASTM A150
>
> H. Institute of Electrical and Electronic Engineers (IEEE) Standard
> 112, Test Method B
>
> I. NEMA 1
>
> J. NEMA Standard MG 1
>
> K. NFPA 70, National Electrical Code
>
> L. Steel Structures Painting Council (SSPC) Surface Preparation
> Specifications SP 2 or SP 3

1.05 [SUBMITTALS]{.underline}

> A. Make submittals according to this Section, Section 15010-S, and
> Section 01300-S.
>
> B. Submit product data for selected models, including specialties,
> accessories, and the following:
>
> 1\. Certified fan performance curves with system operating conditions
> indicated. All performance curves shall be corrected for an altitude
> of 5,500 ft.
>
> 2\. Certified fan sound power ratings.
>
> 3\. Motor ratings and electrical characteristics plus motor and fan
> accessories.
>
> 4\. Materials gages and finishes, including color charts.
>
> 5\. Dampers, including housings, linkages, and operators.
>
> C. Submit shop drawings from manufacturer detailing equipment
> assemblies and indicating dimensions, weights, required clearances,
> components, and location and size of field connections.
>
> D. Submit coordination drawings, in accordance with Division 15
> Section \"Basic Mechanical Requirements, \"for fan room layouts.\"
>
> E. Submit wiring diagrams that detail power, signal, and control
> wiring. Differentiate between manufacturer-installed wiring and
> field-installed wiring.
>
> F. Submit maintenance data in the operating and maintenance manual as
> specified in Section 01300-S.

1.06 [DELIVERY, STORAGE, AND HANDLING]{.underline}

> A. Deliver fan units as a factory-assembled unit to the extent
> allowable by shipping limitations, with protective crating and
> covering.
>
> B. See Section 15010-S.

1.07 [SEQUENCING]{.underline}

> A. Coordinate the size and location of concrete equipment pads.
>
> B. Coordinate the size and location of structural steel support
> members.

1.08 [EXTRA MATERIAL]{.underline}

> A. Furnish one additional complete set of belts for each belt-driven
> fan.

[PART 2 - PRODUCTS]{.underline}

2.01 [ACCEPTABLE MANUFACTURERS]{.underline}

> A. Provide products by one of the following:
>
> 1\. Centrifugal Fans:
>
> a\. Barry Blower
>
> b\. Champion Fan

c.  Buffalo Forge Co.

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d.  Greenheck

e.  Twin City

B. [Substitutions]{.underline}: only under provisions of Section 1600-S.

2.02 [GENERAL FAN REQUIREMENTS]{.underline}

> A. Provide fans that are factory fabricated and assembled, factory
> tested, and factory finished, with indicated capacities and
> characteristics.
>
> B. Fans and Shafts: Statically and dynamically balanced and designed
> for continuous operation at the maximum rated fan speed and motor
> horsepower.
>
> 1\. Fan Shaft: Turned, ground, and polished steel, designed to operate
> at no more than 70 percent of the first critical speed at the top of
> the speed range of the fan\'s class.
>
> C. Belt Drives: Factory mounted, with final alignment and belt
> adjustment made after installation.
>
> 1\. Service Factor: 1.4.
>
> D. Belts: Oil-resistant, nonsparking, and nonstatic.
>
> E. Motors and Fan Wheel Pulleys: Adjustable pitch for use with motors
> through 15 horsepower (hp); fixed pitch for use with motors larger
> than 15 hp. Select pulley so that pitch adjustment is at the middle of
> the adjustment range at fan design conditions.
>
> 1\. Belt Guards: Provide steel belt guards for motors mounted on the
> outside of the fan cabinet.
>
> F. Shaft Bearings: Provide type indicated, having a median life
> \"Rating Life\" (AFBMA (L10)) of 120,000, calculated in accordance
> with AFBMA Standard 9 for ball bearings and AFBMA Standard 11 for
> roller bearings.
>
> G. Factory Finish: The following finishes are required:
>
> 1\. Sheet Metal Parts: Prime coating prior to final assembly.
>
> 2\. Exterior Surfaces: Baked-enamel finish coat after assembly.
>
> H. The following factory tests are required:
>
> 1\. Sound Power Level Ratings: Comply with AMCA Standard 301 \"Method
> for Calculating Fan Sound Ratings From Laboratory Test Data.\" Test
> fans in accordance with AMCA Standard 300 \"Test Code for Sound
> Rating.\" Fans shall be licensed to bear the AMCA Certified Sound
> Ratings Seal.
>
> 2\. Fan Performance Ratings: Establish flow rate, pressure, power, air
> density, speed of rotation, and efficiency by factory tests and
> ratings in accordance with AMCA Standard 210/ASHRAE Standard 51 -
> Laboratory Methods of Testing Fans for Rating.

2.03 [CENTRIFUGAL AND TUBULAR CENTRIFUGAL FANS]{.underline}

> A. General Description: Belt-driven centrifugal fans consisting of
> housing, wheel, fan shaft, bearings, motor, drive assembly, and
> support structure. Centrifugal fan shall be Class III construction.

B.  Housings:

> 1\. Centrifugal Fans - Fabricated from formed and reinforced
> galvanized steel panels to form curved scroll housings with
> continuously welded flanged split housing and access doors or panels
> to allow access to internal parts and components.
>
> a\. Duct Connections: Flanged.

b.  Panel Bracing: Steel angle- or channel-iron member supports for
    mounting and supporting fan scroll, wheel, motor, and accessories.

> 2\. Tubular Centrifugal Fans - Fabricate tubular housing from formed -
> and reinforced-steel panels with welded seams and the following:

a.  Outlet guide vanes

b.  Motor disconnect switch.

c.  Spun inlet cone with flange.

d.  Outlet flange.

e.  Brackets suitable for horizontal mounting.

> C. Fan Wheels: Single-width, single-inlet, welded to cast-iron or
> cast-steel hub and spun steel inlet cone, with hub keyed to the shaft.
>
> 1\. Blade Materials: Steel.
>
> 2\. Blade Type: Backward-curved, airfoil type.
>
> D. Shaft Bearings: Grease-lubricated, self-aligning, pillow-block
> type; tapered roller bearings with double-locking collars and two-
> piece, cast-iron housing.

E. Accessories: The following accessories are required where indicated:

> 1\. Scroll Housing Access Doors: Latch-type handles; flush-mounted for
> uninsulated housings and raised-mounted for insulated housings.
>
> 2\. Drain Connections for Centrifugal Fans: Threaded, 3/4-inch NPS,
> capped nipple installed at lowest point of housing.

3.  Shaft Seals: Air-tight seals installed around shaft on drive side of
    single-width fans.

4.  Discharge Backdraft Damper: Basis of Design Ruskin CBS92 or Approved
    Substitute.

> 5\. Inertia Pad shall be provided for the centrifugal fans.

2.04 [MOTORS]{.underline}

> A. General
>
> 1\. Apply requirements below to motors covered by this Section except
> as otherwise indicated.
>
> 2\. Motors 1 horsepower (hp) and Larger: Polyphase.
>
> 3\. Frequency Rating: 60 Hz.
>
> 4\. Voltage Rating: Determined by voltage of circuit to which motor is
> connected for the following motor voltage ratings (utilization
> voltages):
>
> a\. Motors smaller than 1 hp: 120 V circuit, 115 V - motor rating.
>
> b\. Motors 1 hp and larger: 480 V circuit, 460 V - motor rating.
>
> 5\. Service factors indicated for motors are minimum values and apply
> at frequency and utilization voltage at which motor is connected.
> Provide motors which will not operate in service factor range when
> supply voltage is within 10 percent of motor voltage rating.
>
> 6\. Provide permanent-split capacitor classification motors for
> shaft-mounted fans and capacitor start classification for belted fans.
>
> 7\. Capacity: Minimum size as indicated. If not indicated, sufficient
> to start and operate connected loads at designated speeds in indicated
> environment, and with indicated operating sequence, without exceeding
> nameplate ratings. Provide motors rated for continuous duty at 100
> percent of rated capacity.
>
> 8\. Temperature Rise: 50 degree (deg) Celsius (C) maximum temperature
> rise at 40 deg C ambient for continuous duty at full load (Class A
> Insulation).
>
> 9\. Motor Speed: Single, multiple, or variable as indicated.
>
> 10\. Motor Construction: NEMA Standard MG 1.
>
> a\. Bases: Adjustable.
>
> b\. Bearings: The following features are required:
>
> 1\) Roller bearings with inner and outer shaft seals.
>
> 2\) Grease lubricated.
>
> 3\) Designed to resist thrust loading where belt drives or other
> drives produce lateral or axial thrust in motor.
>
> c\. Enclosure Type: The following features are required:
>
> 1\) Open drip-proof motors where satisfactorily housed or remotely
> located during operation.
>
> 2\) Guarded drip-proof motors where exposed to contact by employees or
> building occupants.
>
> d\. Noise rating: Quiet. Min. NC-35
>
> e\. Nameplate: Indicate the full identification of manufacturer,
> ratings, characteristics, construction, and special features.
>
> 11\. Starters, Electrical Devices, and Wiring: Electrical devices and
> connections are specified in Division 16.
>
> B. Polyphase Motors
>
> 1\. Squirrel-cage, induction-type, general-purpose conforming to the
> following requirements except as otherwise indicated.
>
> 2\. NEMA Design Letter Designation: \"B,\" unless specifically
> designated \"C\" for high starting torque.
>
> 3\. Service Factor: 1.15.
>
> 4\. Premium Efficient Motors: Guaranteed minimum efficiency equal to
> or greater than 94.1% for a 50 hp motor, and 94.5% for a 60 hp motor,
> and 95.4% for a 125 hp motor. Guaranteed minimum efficiencies are
> established for 4 pole and 1800 rpm synchronous speed motors.
>
> 5\. Variable Speed Motors for Use With Solid-State Drives: Energy
> efficient, squirrel-cage induction, design B units with ratings,
> characteristics, and features coordinated with and approved by drive
> manufacturer. See Division 16 for specifications on VFDs.
>
> 6\. Internal Thermal Overload Protection For Motors: For motors so
> indicated, protection automatically opens control circuit arranged for
> external connection. Protection operates when winding temperature
> exceeds safe value calibrated to the temperature rating of the motor
> insulation.
>
> 7\. Bearings: Double-shielded, pre-lubricated ball bearings suitable
> for radial and thrust loading of the application, unless noted
> otherwise.

[PART 3 - EXECUTION]{.underline}

3.01 [INSPECTION]{.underline}

> A. Inspect areas and conditions, with Installer present, for
> compliance with requirements for installation tolerances, housekeeping
> pads, and other conditions affecting performance of fans.
>
> B. Do not proceed until unsatisfactory conditions have been corrected.

3.02 [INSTALLATION/APPLICATION/ERECTION]{.underline}

> A. General
>
> 1\. Install fans level and plumb, in accordance with manufacturer\'s
> written instructions. Support units as described below, using the
> vibration control devices and anchorage indicated in Section 15200.
> Provide siesmic restraints according to Section 15201.
>
> a\. Support floor-mounted units on concrete inertia bases with
> approved vibration isolation and anchorage.
>
> b\. Support ceiling mounted units with supports for the fan separate
> from the ductwork with approved vibration isolation and anchorage.
> Provide hanger rods according to loads allowed in SMACNA Round
> Industrial Duct Construction Standards, and support according to
> SMACNA.
>
> 2\. Arrange installation of units to provide access space around units
> for service and maintenance.
>
> B. Connections
>
> 1\. Duct installations and connections are specified in other Division
> 15 sections. Make final duct connections with flexible connections.
>
> 2\. Electrical Connections: The following requirements apply:
>
> a\. Electrical power wiring is specified in Division 16.
>
> b\. Temperature control wiring and interlock wiring is specified in
> Section 13943.
>
> c\. Grounding: Connect unit components to ground in accordance with
> the National Electrical Code.

3.03 [FIELD QUALITY CONTROL]{.underline}

> A. Arrange and pay for a factory-authorized service representative to
> perform the following:
>
> 1\. Inspect the field assembly of components and installation of fans
> including ductwork, and electrical connections.
>
> 2\. Prepare a written report on findings and recommended corrective
> actions.

3.04 [ADJUSTING AND CLEANING]{.underline}

> A. Clean unit cabinet interiors to remove foreign material and
> construction dirt and dust. Vacuum clean fan wheel and cabinet.

3.05 [COMMISSIONING]{.underline}

A.  Provide labor, material, equipment, etc., required to facilitate the
    commissioning process. Perform tests and verification procedures
    required by the commissioning process when requested by SNL's
    Commissioning Authority and directed by the General Contractor's
    Test Engineer.

B.  Final Checks before Startup: Perform the following operations and
    checks before startup:

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1.  Verify that shipping, blocking, and bracing are removed.

2.  Verify that unit is secure on mountings and supporting devices and
    that connections for piping, ducts, and electrical components are
    complete. Verify that proper thermal-overload protection is
    installed in motors, starters, and disconnects.

3.  Perform cleaning and adjusting specified in this Section.

4.  Disconnect fan drive from motor, verify proper motor rotation
    direction, and verify fan wheel free rotation and smooth bearings
    operation. Reconnect fan drive system, align and adjust belts, and
    install belt guards.

5.  Verify lubrication for bearings and other moving parts.

6.  Verify that manual and automatic volume control and fire and smoke
    dampers in connected ductwork systems are in the fully open
    position.

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C.  Starting procedures for fans are as follows:

> 1\. Energize motor; verify proper operation of motor, drive system
> and, fan wheel. Adjust fan to indicated RPM.
>
> 2\. Measure and record motor voltage and amperage.

D.  Refer to Section 15901-S for procedures for air-handling-system
    testing, adjusting, and balancing.

E. Replace fan and motor pulleys as required to achieve design
conditions.

3.06 [DEMONSTRATION]{.underline}

A.  Train Owner's maintenance personnel on procedures and schedules
    related to startup and shutdown, troubleshooting, servicing, and
    preventive maintenance.

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B.  Review data in the operation and maintenance manuals. Refer to
    Division 1.

C.  Schedule training with SDR, with at least 7 days' advance notice.

D.  Demonstrate operation of fans. Conduct walking tour of the Project.
    Briefly identify location and describe function, operation, and
    maintenance of each fan.

> END OF SECTION

EXCEPT FOR

DWG F-10A10A