July 22, 1994

Contract \# TW0592

**SPECIAL SPECIFICATION**

**SECTION 15854**

**[CUSTOM AIR HANDLING UNITS]{.underline}**

[Page]{.underline}

**[PART 1 - GENERAL]{.underline}**

1.01 Description.. 2

1.02Related Work\... 2

1.03Quality Assurance\... 2

1.04References.. 3

1.05Submittals.. 4

1.06 Delivery, Storage, and Handling.. 5

1.07Sequencing.. 5

1.08 Extra Materials.. 5

**[PART 2 - PRODUCTS]{.underline}**

2.01Acceptable Manufacturers.. 6

2.02 Manufactured Units.. 6

2.03 Unit Casing and Base.. 6

2.04Supply Fans.. 8

2.05Integral Face and Bypass Dampers.. 10

2.06 Heating and Cooling Water Coils.. 10

2.07 Filters.. 11

2.08Dampers\... 12

2.09Electrical.. 12

2.10 Hot and Chilled Water Piping.. 13

2.11 Temperature Controls\... 13

2.12Motors.. 13

**[PART 3 - EXECUTION]{.underline}**

3.01 Inspectios 16

3.02 Installation/Application/Erection\... 16

3.03 Field Quality Control.. 17

3.04 Adjusting and Cleaning.. 17

3.05 Commissioning\... 17

3.06 Demonstration\..... 17

**SPECIAL SPECIFICATION**

**SECTION 15854**

**[CUSTOM AIR HANDLING UNITS]{.underline}**

**[PART 1 - GENERAL]{.underline}**

**1.01 [DESCRIPTION]{.underline}**

> A. This Section includes custom air-handling units for indoor
> installations.

**1.02 [RELATED WORK]{.underline}**

> A. Section 01300
>
> B. Section 13943
>
> C. Section 15010
>
> D. Section 15200
>
> E. Section 15250
>
> F. Section 15901
>
> G. Section 15995
>
> H. Division 16 Section \"Circuit and Motor Disconnects\" for
> factory-installed disconnect switches.
>
> I. Division 16 Section \"Motor Controllers\" for field-mounted
> alternating-current starters.
>
> J. Division 16 Section \"Motor Control Centers\" for motor control
> centers that are used for centralizing or grouping controls in
> building projects.

**1.03 [QUALITY ASSURANCE]{.underline}**

> A. Design and fabricate central-station air-handling units and
> components according to National Fire Protection Association (NFPA)
> Standard 90A \"Standard for the Installation of Air Conditioning and
> Ventilating Systems.\"
>
> B. Factory Test: Custom air-handling manufacturer shall start and run
> test each fan/motor set. Additionally, all factory installed piping
> shall be hydrostatically leak tested, electric controls with
> associated wiring circuits energized, and run through complete
> sequence of operation.
>
> C. Manufacturer Qualifications: The manufacturer of the custom
> air-handling units shall have at least 10 years of continuous,
> uninterrupted custom fabrication immediately prior to bid date. Units
> of similar design and application shall be in operation as of bid date
> and manufacturer shall have demonstrated the capability to factory
> test units. Field assembled units from pre-fabricated panels are not
> considered equal to a factory fabricated machine. Standard cataloged
> equipment requiring modification to meet criteria herein shall not be
> considered \"as equal\" to the custom air-handler specified.

**1.04 [REFERENCES]{.underline}**

> A. American Iron and Steel Institute (AISI) C-1040 and C-1050
>
> B. 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
>
> C. Anti-Friction Bearing Manufacturers Association (AFBMA)
>
> D. AMCA Standard 300, Test Code for Sound Rating
>
> E. AMCA Standard 301, Method for Calculating Fan Sound Ratings From
> Laboratory Test Data
>
> F. AMCA Standard 500, Test Method for Louvers, Dampers and Shutters
>
> G. American Refrigeration Institute (ARI) 410 - Standard for
> Forced-Circulation, Air-Cooling, and Air-Heating Coils
>
> H. ARI 430, Standard for Central-Station, Air-Handling Units
>
> I. ASHRAE Test Standard 52, Method of Testing Air-Cleaning Devices
> Used in General Ventilation for Removing Particulate Matter
>
> J. American Society for Testing and Materials (ASTM) A36
>
> K. ASTM A150
>
> L. ASTM A527
>
> M. ASTM E90
>
> N. ASTM E413
>
> O. Institute of Electrical and Electronic Engineers (IEEE) Standard
> 112, Test Method B
>
> P. National Electrical Manufacturers Association (NEMA) 1
>
> Q. NEMA Standard MG 1
>
> R. NFPA Standard 90A, Standard for the Installation of Air
> Conditioning and Ventilating Systems
>
> S. Occupational and Safety Health Administration (OSHA)
>
> T. Steel Structures Painting Council (SSPC) Surface Preparation
> Specifications SP 2 or SP 3
>
> U. UL
>
> V. 29 CFR 1910.7

**1.05 [SUBMITTALS]{.underline}**

> A. Make submittals according to this Section, Section 15010, and
> Section 01300.
>
> B. Submit product data for each central-station air-handling unit
> indicated, including the following:
>
> 1\. Certified fan performance curves with system operating conditions
> indicated.
>
> 2\. Certified fan sound power ratings.
>
> 3\. Certified coil performance ratings with system operating
> conditions indicated.
>
> 4\. Motor ratings and electrical characteristics plus motor and fan
> accessories.
>
> 5\. Materials gages and finishes.
>
> 6\. Filters with performance characteristics.
>
> 7\. Dampers, including housings, linkages, and operators.
>
> 8\. Construction details of unit enclosure.
>
> 9\. Motor and control panel wiring.
>
> 10\. Control components and wiring details.
>
> C. Submit shop drawings from manufacturer detailing dimensions,
> required clearances, components, and location and size of each field
> connection.
>
> D. Submit coordination drawings for custom air-handling units in
> accordance with Division 15 Section \"Basic Mechanical Requirements.\"
>
> E. Submit wiring diagrams detailing wiring for power and controls and
> differentiating between manufacturer-installed wiring and
> field-installed wiring.
>
> F. Submit field quality control test reports specified in Part 3 of
> this Section.

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

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

**1.07 [SEQUENCING]{.underline}**

> A. Coordinate the size and location of concrete equipment pads.

**1.08 [EXTRA MATERIALS]{.underline}**

> A. Furnish one additional complete set of pre-filters for each unit.
>
> B. Furnish one additional complete set of belts for each unit.

**[PART 2 - PRODUCTS]{.underline}**

**2.01 [ACCEPTABLE MANUFACTURERS]{.underline}**

> A. Provide products by one of the following:
>
> 1\. Webco.
>
> 2\. Buffalo Forge.
>
> 3\. Miller Picking.

**2.02 [MANUFACTURED UNITS]{.underline}**

> A. Provide factory assembled, consisting of fans, motor and drive
> assembly, coils, dampers, plenums, filters, drip pans, and mixing
> dampers.
>
> B. Include custom air-handling units in this project of the following
> types:
>
> 1\. Blow-through.
>
> 2\. Draw-through.

**2.03 [UNIT CASING AND BASE]{.underline}**

> A. Unit casing is to be fabricated from brake-formed panels of
> 16-gage, galvanized steel. Panels shall be joined together by welding.
> Roll-formed clamping strips and screws or bolts are not acceptable to
> assemble casing walls. Entire outside casing is prepared for painting
> by acidizing. All joints shall be caulked with rubber caulking that
> air dries to form a permanently flexible weather-resistant seal for
> total air-tight construction. Casing base metal is to be zinc coated
> with a minimum of .60/.80 ounce per square foot, and shall have an
> average coating thickness on both sides of .0006 inch (in.). Following
> the coating, the sheets shall be annealed to produce a zinc-iron alloy
> to meet ASTM A527.
>
> B. Welded wall and roof sections shall be completely covered with an
> acoustical and thermal efficient 2 in., 3 pound unfaced fiberglass
> insulation which complies with all requirements of NFPA Bulletin No.
> 90-A. The insulation shall not mold, rot, or sustain vermin, and shall
> not corrode metals or disintegrate under vibrations. The material is
> to be odorless, shall not absorb odors, and shall resist water
> moisture permanently without chemical breakdown. A double-wall casing
> shall incorporate a perforated interior liner of 22-gage galvanized
> steel. Media is to be lined with a 4-millimeter (mm) mylar.
>
> C. All compartments shall be fully accessible through insulated,
> double-walled access doors. Doors shall be mounted on stainless steel
> butt hinges and retained by at least two chrome-plated hardware
> latches operable from interior or exterior of unit. The hardware can
> be operated from either side of the door. Double-wall door shall have
> a mechanically fastened bulb seal around entire perimeter of door
> frame. All doors shall open against static pressure and close flush
> with the exterior cabinet surface. Each door shall incorporate dual
> pane wire reinforced window.
>
> D. Internal compartments, where needed, shall be individually drained
> to the exterior of the unit for field connection by others. Any
> necessary traps are external to the unit and provided by others.
>
> E. Unit exterior will be primed and finish coated with two coats of
> air dried enamel. Color may be selected by customer.
>
> F. Floor rigidity is to be maintained by the addition of steel channel
> or angle members which act not only as a rigid foundation to which all
> component isolators are secured but also as a floor stiffener.
>
> G. An integral structural steel weldment base frame shall support the
> unit\'s casing and all internal components. Base frame is to be a
> engineered structural member. Formed metal base construction
> techniques are not acceptable. The base frame shall include four (4)
> or more lifting lugs bolted in place so located as to minimize lifting
> stress and designed for use with clevises. Base frame is to be
> constructed to minimize oil-canning and deflection due to component
> loading. All internal components shall be supported by structural
> steel members and supported by the periphery of the base frame. The
> floor is to be 10-gage (ga.) black hot rolled sheet steel, with all
> seams continuously welded. Entire floor area is to be coated with
> Overshield emulsion applied at the factory. The coating shall have a
> flame spread of 25 or less, smoke generation of 50 or less, and fuel
> contribution of 0. Entire floor underside is to be insulated with 2
> in., 3-pound fiberglass. Insulation is to be retained with a 20-ga.,
> solid, galvanized, steel liner. During component installation, no
> holes or bolts are allowed to penetrate the floor pan.
>
> H. Sound Transmission Loss Values: The following casing transmission
> loss values are required as a minimum and shall be obtained by an
> independent sound lab that is accredited by the U.S. Department of
> Commerce, National Institute of Standards and Technology under the
> National Voluntary Laboratory Accreditation Program for this test
> procedure. All tests shall be performed in explicit conformance with
> ASTM E90-90 and E413-87.
>
> FREQ. 125 250 500 10002000 4000 STC
>
> PERF. LINER 21 26 31 42 50 58 37
>
> SOLID LINER 23 41 47 50 56 63 47
>
> I. This unit shall incorporate appropriate sections with components to
> achieve the scheduled performance listed on the Drawings, in the
> arrangement shown on the attached Drawings.
>
> J. Fabricate units in sub-sections or modules having the following
> features:
>
> 1\. Fabricate so that power wiring can be properly reconnected on
> terminal strips located in junction boxes in adjacent sub-sections or
> modules.
>
> 2\. Fabricate so that control wiring can be reconnected by
> reconnecting male and female connectors.
>
> 3\. Fabricate so that piping can be reconnected by couplings, unions,
> or flanged joints and tubing by re-connection of tube fittings.
>
> 4\. Fabricate so that panel frames and panels can be easily joined
> together in the field by bolting through companion angles or flanges.
>
> 5\. Provide adequate lifting lugs, gaskets, flashing materials,
> attachment devices, and sealants to facilitate a complete, airtight,
> watertight, and operable installation.
>
> 6\. Provide an independent structural steel base.
>
> K. Seal [all]{.underline} penetrations of the unit casing. All field
> connections shall be made exterior to the unit casing.
>
> L. Interior piping shall be according to Section 15051 and 15401.

**2.04 [SUPPLY FANS]{.underline}**

> A. The fans shall be of the centrifugal plenum designed without a
> scroll type housing. Fans shall incorporate a non-overloading type,
> backward-inclined, airfoil-blade wheel, heavy gauge reinforced steel
> inlet plate, structural steel frame, shaft, and bearings in AMCA
> arrangement #3 configuration. Each fan shall be run fully assembled at
> the factory, prior to shipment, at the operating revolution-per-minute
> (rpm) or the maximum class rpm.
>
> B. Inlet plates are to be of heavy gauge reinforced steel
> construction. The inlet plates shall be welded to the heavy structural
> angle frame to form an integral unit. The inlet plate incorporates a
> removable spun inlet cone designed for smooth airflow into the
> accompanying venturi-shaped inlet cones of the fan steel. A square
> formed lip surrounds the unit suitable for attachment of a boot
> connector, or an optional round inlet ring can be provided.
>
> C. Fan Wheels: All fan wheels shall have spun inlet cones providing a
> minimum separation in airflow. Blades shall be die formed airfoil
> shaped. All nine blades shall be continuously welded to the inlet
> cones as well as the back plates. No partial welding will be
> acceptable.
>
> D. Class I and II wheels shall have cast iron hubs. All wheels shall
> be \"true\" lined, statically and dynamically balanced on precision
> electronic balancers. Each wheel shall be designed for critical speeds
> of at least 1.25 times the maximum class speed. Initial operating fan
> rpm shall not exceed 90 percent of fan class maximum rpm to allow for
> final air balance.
>
> E. Fan Shafts: All sizes are to have shafts of solid AISI C-1040, or
> C-1045 hot rolled steel accurately turned, ground, polished, and ring
> gauged for accuracy. All shafts must be dial indicated for
> straightness after the keyways are cut and straightened as required.
> Shafts shall have first critical speeds at least 1.35 times the
> maximum speeds of the fan.
>
> F. Bearings: All fans are to have heavy duty, grease lubricated,
> precision anti-friction ball or roller, self-aligning, pillow-block,
> type bearings. Bearings are to be selected for minimum average bearing
> life (AFBMA L-50) in excess of 200,000 hours when operating at maximum
> catalogued class conditions. All bearings shall be equipped with
> re-greasable zerk fittings and where necessary, extended lube lines
> for easy access for relubrication.
>
> G. Painting: Each fan component shall be thoroughly degreased and
> deburred before the application of a rust-preventative blue primer.
> After complete assembly, a finish coat shall be applied to the
> complete assembly.
>
> H. All fans shall be AMCA certified for sound and air performance and
> bear the AMCA seal. Fans shall be manufactured by Barry Blower or
> pre-approved equal.
>
> I. Supply fan section shall be complete with supply fan, inlet screen,
> access panel for wheel removal, motor, drive, support frame, open type
> spring isolators with seismic snubbers, fan wheel guard and OSHA
> approved belt guard.
>
> J. Fan and motor shall be mounted on a welded and painted structural
> steel channel base frame. This assembly shall be isolated from the
> casing and floor. Outlet of the fan is to be separated from unit
> casing by use of factory assembled flexible connection. The fan, motor
> and base frame assembly shall be mounted on a minimum of four (4) coil
> spring vibration isolators with neoprene pads and seismic snubbers.
> Vibration isolators shall be selected for 95 percent efficiency. See
> Section 15200.
>
> K. Furnish extended copper lubrication lines from fan bearings to zerk
> fitting on unit casing, mounted and pre-packed with grease at the
> factory.
>
> L. Fan assembly to be statically and dynamically balanced in the
> factory then given a final test with motor and drive in place. Drive
> assembly to include an expanded metal belt guard with an rpm
> measurement port.
>
> M. The drive motor is to be furnished by the unit manufacturer and
> mounted on a belt tensioning base. Belt tension shall be adjustable by
> means of tensioning bolts.
>
> N. At startup, the Contractor shall install one final set of drive
> sheaves to balance the unit into the system. The unit manufacturer
> shall furnish this one additional set to the Installing Contractor.
> Installation of any additional sheaves shall be the responsibility of
> the Balancing Contractor.

**2.05 [INTEGRAL FACE AND BYPASS HEATING COILS]{.underline}**

> A. Each heating coil to consist of built-in series of finned heating
> elements and bypasses with interlocked dampers to be controlled via a
> damper motor(s) and airstream thermostat. Each coil shall be capable
> of maintaining a constant discharge air temperature regardless of
> variations in entering air temperature with full stream pressure (or
> full hot water flow) on the coil at all times.
>
> B. Proportioning of the air shall be such that the temperature at any
> point in a plane parallel to the face of the coil three feet
> downstream from the leaving side will not vary more than 5 degrees
> Fahrenheit from the average discharge temperature.
>
> C. Dampers shall be 16 gage roll formed, cold-rolled steel with an air
> dried machine enamel finish. The damper shall be provided with
> electric actuator(s) as indicated on the referenced control drawings.
> Actuators shall be factory installed.
>
> D. Finned heating elements shall be fabricated of seamless return bend
> type copper tubes with rectangular aluminum fins spaced not closer
> than 11 fins per inch. Each tube shall be individually secured to the
> supply and return headers by a brazed joint with provision for
> individual tube expansion and contraction. Tubes shall be secured
> against vibration by a channel-shaped retainer, permitting expansion
> and contraction. Finned elements shall be factory tested at 200
> pounds-per-square-inch-gage (psig) steam and 1000 psig hydrostatic
> pressure.
>
> E. Pressure drop of air through the coil shall not vary more than plus
> or minus 5 percent, regardless of the position of the internal
> dampers. Coil shall have vertical tubes and performance certified by
> ARI.
>
> F. Coil manufacturer shall be Wing or approved equal.

**2.06 [HEATING AND COOLING WATER COILS]{.underline}**

> A. Primary surface shall be round seamless 5/8-in O.D., .020-in. thick
> wall, copper tubes on 1-1/2-in. centers, staggered in the direction of
> airflow. All joints shall be brazed.
>
> B. Secondary surface shall consist of rippled .0075-in. aluminum plate
> fins for higher capacity and structural strength. Fins shall have full
> drawn collars to provide a continuous surface cover over the entire
> tube for maximum heat transfer. Bare copper tubes shall not be visible
> between fins and the fins shall have no openings punched in them to
> accumulate lint and dirt. Tubes shall be mechanically expanded into
> the fins to provide a continuous primary to secondary compression bond
> over the entire finned length for maximum heat transfer rates.
>
> C. Casings shall be constructed of stainless steel with 3/8-in.
> diameter bolt holes for mounting on 6-in. centers. Coil side plates
> shall be of reinforced flange type.
>
> D. Coils shall have the connections located to permit universal
> mounting of the coil for right- or left-hand airflow and have equal
> pressure drop through all circuits. Coils shall be circuited for
> counterflow heat transfer to provide the maximum mean effective
> temperature difference for maximum heat transfer rates. Coil fin
> height shall not exceed 48 in..
>
> 1\. Water coils: Headers on water coils shall be seamless copper
> tubing. The headers shall have intruded tube holes to provide a large
> brazing surface for maximum strength and inherent flexibility.
>
> 2\. The complete coil core shall be tested with 315 psig air pressure
> under warm water and be suitable for operation at 250 psig working
> pressures. Individual tube test and core tests before installation of
> headers is not considered satisfactory. Hydrostatic tests alone will
> not be acceptable. Water cooling coils shall be circuited for
> drainability and for service without removing individual plugs from
> each tube. Use of internal restrictive devices to obtain turbulent
> flow will not be acceptable since they prevent complete draining of
> the coil.
>
> E. One side of this section shall have a gasketed, and bolted,
> removable access panel.
>
> F. Each coil shall have a condensate drain pan extending a minimum of
> 12 in. downstream of the coil face for upper coils, and 18 in. for the
> lower most coil. All condensate drain pans shall be stainless steel.
> All intermediate drain pans shall be fitted with downspouts to drain
> condensate to primary drain pan. Trapping of primary drain shall be
> furnished and installed by Contractor external to the unit casing.

**2.07 [FILTERS]{.underline}**

> A. Pre-filters shall be 2-in. thick, medium efficiency, pleated,
> disposable type. Each filter shall consist of a non-woven cotton and
> synthetic fabric media, media support grid and enclosing frame. The
> filter shall be listed by Underwriters\' Laboratories as Class 2.
>
> 1\. The filter media shall have an average efficiency of 25-30 percent
> on ASHRAE Standard 52-76. It shall have an average arrestance of 90-92
> percent in accordance with that standard. The effective filter media
> shall be not less than 4.6 square feet of media per 1.0 square foot of
> filter face area and shall contain not less than 15 pleats per linear
> foot. Initial resistance at 500 feet-per-minute (fpm) approach
> velocity shall not exceed .28 in. w.g..
>
> 2\. Pre-filter media shall be Farr 30/30 or pre-approved equal.
>
> B. Final filters shall be 12-in. thick, high performance, deep
> pleated, totally rigid and totally disposable type. Each filter shall
> consist of high density media, media support grid, contour
> stabilizers, diagonal support bracing and enclosing frame. The filter
> shall be listed by Underwriters\' Laboratories as Class 2.
>
> 1\. Filter media shall be of high density microfine glass fibers,
> laminated to a reinforcing backing to form a lofted filter blanket.
> The filter media shall have an average efficiency of 60-65 percent on
> ASHRAE Standard 52-76. It shall have an average arrestance of 97
> percent on that standard. Initial resistance at 500 fpm approach
> velocity shall not exceed .29 in. w.g..
>
> 2\. Pre-filter and final filter media will mount in glidepack
> aluminums extrusions suitable for side access service.
>
> 3\. Final filter media shall be Farr RF-15 or pre-approved equal.
>
> C. Magnehelic Gauges: Dwyer Gauges or approved equal for the filter
> banks shall be factory mounted on the face of the unit control panel.
> Separate gauges shall be provided for each filter bank. The pre-filter
> bank gauge shall have a 0 to 1 in. w.g. range. The final filter bank
> gauge shall have a 0 to 3 in. w.g. range.

**2.08 [DAMPERS]{.underline}**

> A. Furnish and install dampers shown on or in units at the location
> shown on the attached Drawings. Dampers shall be low leakage type when
> tested in accordance with AMCA Standard 500 providing leakage rates of
> 6 cubic-feet-per-minute-per-square-foot at 4 in. w.g. differential
> pressure. Dampers shall be constructed of extruded aluminum frames and
> airfoil blades with blade and edge seals. All dampers shall be
> provided with electric actuators (factory installed) as indicated on
> Referenced Control Drawings.
>
> B. Unit manufacturer shall supply a pressure equalization perforated
> plate on outside air intakes as shown.

**2.09 [ELECTRICAL]{.underline}**

> A. Fan motor shall be factory wired to a NEMA 1, N-F disconnect
> located in the units control panel for field connection by others. The
> disconnect switch shall be operable from the exterior of the control
> panel. Convenience controls (120 Volt \[V\]) will consist of one light
> and switch in each access section with one receptacle to be pre-wired
> and tested at the factory.
>
> B. All transformers, terminal strips and wiring to be furnished and
> factory installed.
>
> C. All conduit shall be piped to the exterior of the unit for final
> field connection where the conduit penetrates the unit casing, the
> penetration shall be factory sealed airtight.

**2.10 [HOT AND CHILLED WATER PIPING]{.underline}**

> A. Heating and cooling coils shall have headers within the unit and
> terminate at the exterior of the unit with flanges. VIFB coil piping
> shall include flex connections and condensate piping. All piping
> penetrations of the unit casing shall be sealed airtight at the
> factory.

**2.11 [TEMPERATURE CONTROLS]{.underline}**

> A. Temperature controls shown within the unit and designated on
> Control Drawings 104658 C5, C6, C8, C15, and C16 shall be provided by
> the unit manufacturer. A control panel located on the exterior of the
> unit casing shall house required transformer and terminal strips for
> field connection. Reference Control Drawing 104663 C5 for typical
> control box wiring diagram.

**2.12 [MOTORS]{.underline}**

> A. General
>
> 1\. Apply requirements below to motors covered by this Section except
> as otherwise indicated.
>
> 2\. Motors: Polyphase.
>
> 3\. Frequency Rating: 60 Hertz.
>
> 4\. Voltage Rating: Determined by voltage of circuit to which motor is
> connected for the following motor voltage ratings (utilization
> voltages):
>
> a\. Motors: 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\. 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.
>
> 7\. Temperature Rise: 50 degree (deg) Celsius (C) maximum temperature
> rise at 40 deg C ambient for continuous duty at full load (Class A
> Insulation).
>
> 8\. Motor Speed: Single or variable as indicated.
>
> 9\. Motor Construction: NEMA Standard MG 1.
>
> a\. Bases: Adjustable.
>
> b\. Bearings: The following features are required:
>
> 1\) Ball or 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.
>
> d\. Noise rating: Quiet.
>
> e\. Nameplate: Indicate the full identification of manufacturer,
> ratings, characteristics, construction, and special features.
>
> 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\. Energy Efficient Motors: Nominal efficiency equal to or greater
> than that stated in NEMA MG 1, table 12-6C for that type and rating of
> motor.
>
> 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.
>
> 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 central-station
> air- handling units.
>
> B. Inspect rough-in for steam, hydronic, condensate drainage piping
> and electrical to verify actual locations of connections prior to
> installation.
>
> C. Do not proceed until unsatisfactory conditions have been corrected.

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

> A. General
>
> 1\. Install CUSTOM air-handling units level and plumb, in accordance
> with manufacturer\'s written instructions.
>
> a\. Support floor-mounted units on concrete equipment pads.
>
> 2\. Arrange installation of units to provide access space around air-
> handling units for service and maintenance.
>
> B. Connections
>
> 1\. Piping installation requirements are specified in other Division
> 15 sections. The Drawings indicate the general arrangement of piping,
> valves, fittings, and specialties. The following are specific
> connection requirements:
>
> a\. Arrange piping installations adjacent to units to allow unit
> servicing and maintenance.
>
> b\. Connect piping to units with flexible connectors.
>
> 2\. Duct installations and connections are specified in other Division
> 15 sections. Make final duct connections with flexible connections.
>
> 3\. 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
> central-station air-handling units including piping, ductwork, and
> electrical connections.
>
> 2\. Prepare a written report on findings and recommended corrective
> actions.

**3.04 [ADJUSTING AND CLEANING]{.underline}**

> A. Adjust water coil flow, with control valves to full coil flow, to
> indicated gallons-per-minute.
>
> B. Adjust damper linkages for proper damper operation.
>
> C. Clean unit cabinet interiors to remove foreign material and
> construction dirt and dust. Vacuum clean fan wheel, fan cabinet, and
> coils entering air face.

**3.05 [COMMISSIONING]{.underline}**

> A. Provide labor, material, equipment, etc., required to facilitate
> the commissioning process. Perform form tests and verification
> procedures required by the commissioning process when requested by the
> Commissioning Authority and directed by the General Contractor. See
> Section 15995.

**3.06 [DEMONSTRATION]{.underline}**

> A. Provide a factory-authorized service representative supervise
> start-up of equipment, to demonstrate operation, and to provide a
> minimum of 4 hours of owner training to train personnel.
>
> B. See Section 15995.
>
> END OF SECTION

EXCEPT FOR ATTACHED DRAWINGS

SK-AHU-1,-2,-4,-15,-16