July 22, 1994

Contract \# TW0592

**SPECIAL SPECIFICATION**

**SECTION 15833**

**[CLEAN ROOM RECIRCULATION AIR-HANDLING UNITS]{.underline}**

**[Page]{.underline}**

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

1.01 Description. 2

1.02Related Work.. 2

1.03Quality Assurance.. 2

1.04References.. 5

1.05Submittals 6

1.06 Delivery, Storage, and Handling.. 8

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

2.01Acceptable Manufacturers.. 9

2.02 Materials\.... 9

2.03 Equipment.. 9

2.04 Fabrication\.... 10

2.05 Motors\... 20

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

3.01 Installation/Application/Erection\... 22

3.02 Field Quality Control.. 22

3.03 Commissioning.. 22

**SPECIAL SPECIFICATION**

**SECTION 15833**

**[CLEAN ROOM RECIRCULATION AIR-HANDLING UNITS]{.underline}**

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

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

> A. This Section specifies custom-built air-handling units and
> accessories, as indicated in the Drawings.
>
> B. The units specified under this section are designated by the
> follow­ing equipment numbers: 104 through 113.

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

> A. Section 01300
>
> B. Section 13943
>
> C. Section 15010
>
> D. Section 15050
>
> E. Section 15051
>
> F. Section 15023
>
> G. Section 15200
>
> H. Section 15401
>
> I. Section 15995

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

> A. The materials and methods of con­struction for these air-handling
> units and accessories here­in­after specified shall comply with the
> current editions (unless speci­fi­cally indicated otherwise) of the
> practices, methods, or standards prepared by the applicable technical
> societies and associations.
>
> B. 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 as described below.
> Field assembled units from pre-fabricated panels are not considered
> equal to a factory fabricated machine.
>
> C. Qualifications and Tests
>
> 1\. Welder Qualifications
>
> a\. Perform structural and mechanical welding, brazing, and soldering
> with certified welders or welding operators having
>
> 1\) Training and experience in accepted welding procedures.
>
> 2\) Welding certification in accordance with American Society of
> Mechanical Engineers (ASME) Section 9.
>
> 2\. Factory Tests
>
> a\. Test one type of unit serving each cleanroom as follows:
>
> Room \# Responsible AHU(s)
>
> 1401 AHU - 5, 6, 7, 8, 9
>
> 1403 AHU - 10, 11
>
> 1208 AHU - 11, 12
>
> 1303 AHU - 14
>
> The owner reserves the right to randomly select which units are
> tested.
>
> b\. Submit detailed unit test plan for approval prior to conducting
> factory tests.
>
> c\. Perform tests in presence of Sandia National Laboratory (SNL)
> representative in order that results might be witnessed and certified.
>
> d\. Test each unit as a complete assembly for a minimum of two hours
> (hr.) and ensure that all components perform in accordance with the
> procedures outlined below:
>
> 1\) A performance test shall be run on each tested unit. For each
> test, the return air and supply air openings shall remain in the open
> positions. All pre-filters shall be in place, along with all
> components of the unit. A minimum of 8 feet (ft.) of rectangular
> discharge duct shall be installed on the unit\'s supply air opening.
> The duct shall be throttled at its outlet plane as a means of varying
> the system resistance to obtain different performance determina­tions.
> A pitot tube traverse test shall be conducted in the discharge duct
> based on the guidelines set forth in Air Movement and Control
> Association (AMCA), Standard (Std.) 203, \"Field Performance
> Measurements\". Fan power shall be determined by means of a calibrated
> wattmeter in conjunction with the motor manufacturer\'s actual tested
> motor efficiencies. Three performance deter­minations shall be made.
> One determination shall be made at or near the rated flow and
> pressure. The other two deter­minations shall be made at a higher and
> lower flow so as to define a short range of the unit\'s performance
> curve. All test data shall be conducted in accordance with AMCA Std.
> 203.
>
> 2\) Sound pressure levels shall be measured at the return-air, and
> supply openings with the unit\'s rated performance point established
> by throttling at the supply-air, discharge duct. These readings should
> be unaffected by the throttling noise at the opposite end of the
> cabinet. If it is determined there is some interference, a noise
> deflection/absorption barrier shall be erected near the discharge
> throttling area. The discharge duct shall be removed and the
> supply-air dampers fully opened. The sound pressure levels at the
> supply-air discharge plane shall be measured. Again, the sound barrier
> shall be erected at the unit\'s inlet throttling planes if significant
> interference exists. The unit must conform to the following sound
> criteria:
>
> OCTAVE BAND - db
>
> 1 2 3 4 5 6 7 8
>
> UNIT
>
> OUTLET 96 102 102 97 95 90 85 80
>
> UNIT
>
> INLET 94 100 100 94 91 84 73 80
>
> 3\) Pressure tests on and all piping systems.
>
> 4\) Air-pressure test with the fan operating to ensure tight housing
> construction and integrity. After completion of the unit, a pressure
> test at design static pressure is required on unit. Air leakage to be
> measured with a calibrated orifice plate or flow tube. Air leakage not
> to exceed 1/2 of 1 percent of total air-flow.
>
> 5\) Unit operation and vibration analysis with unit fans operating at
> the unit design revolutions-per-minute (rpm). Balance fan and motor so
> that vibration of assembly is 0.5 millimeters peak-to-peak or better.
>
> 6\) Test of electrical devices, energized as components, to ensure
> operational integrity.
>
> 7\) The thermal performance of each tested unit shall be measured. For
> each test all penetrations of the tested unit shall be sealed. The
> tested unit shall be placed in a location which prevents air currents.
> A heat source shall be added to the tested unit interior, after 2
> hours the exterior skin temperature shall be measured. The difference
> between the tested unit outer skin temperature and the air temperature
> at the same location shall be used to determine the heat loss
> coefficient. The heat loss coefficient shall be 0.07
> British-thermal-units-per-hour (Btu/hr.)/ft2/degrees (deg.) Fahrenheit
> (F).
>
> e\. Correct defects found during unit testing prior to shipment.
>
> f\. Submit test data for approval prior to unit shipment.

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

A. Air Movement and Control Association (AMCA) Std. 203

> B. American Society of Mechanical Engineers (ASME), ASME Boiler and
> Pressure Vessel Code Section IX
>
> C. American Society of Heating, Refrigerating, and Air-Conditioning
> Engineers (ASHRAE) Standard 52-76
>
> D. American National Standards Institute (ANSI) MC96.1
>
> E. Air-Conditioning and Refrigeration Institute (ARI) 410-91
>
> F. American Society for Testing and Materials (ASTM) E84
>
> G. ASTM A386
>
> H. ASTM A525
>
> I. ASTM B209
>
> J. ASTM B200
>
> K. ASTM B221
>
> L. ASTM B251
>
> M. Electrical Standards Institute (ESI)
>
> N. Federal Specification TT-S-001543A
>
> O. Federal Specification TT-S-001657
>
> P. Insulated Cable Engineers Association (ICEA) S-66-524
>
> Q. ICEA S-82-552
>
> R. Illuminating Engineering Society of North America (IES)
>
> S. Institute of Electrical and Electronic Engineers (IEEE) No. 112,
> Method B
>
> T. MIL-A-46106A
>
> U. MIL-STD-282
>
> V. National Electrical Manufacturer\'s Association (NEMA) MG1-12.53a
>
> W. National Electrical Code (NEC)
>
> X. National Fire Protection Association (NFPA) 79
>
> Y. Sheet Metal and Air Conditioning Contractor\'s Association
> (SMACNA), \"Heating, Ventilating, and Air-Conditioning (HVAC) Duct
> Construction Standards - Metal and Flexible\"

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

> A. Make submittals according to this Section, Section 15010, and
> Section 01300.
>
> B. Submit manufacturer\'s literature and certified prints.
>
> C. Submit Shop Drawings on sheets no larger than 30 inches (in.) by 42
> in. to include the following:
>
> 1\. Location and sizes of:
>
> a\. Piping connections
>
> b\. Electrical connections
>
> c\. Control tubing and wiring connections
>
> d\. Support points
>
> e\. Access areas required for maintenance
>
> 2\. Operating weight and support locations of unit when bolted
> together in one assembly.
>
> 3\. Shipping weight of each module or sub-section broken down for
> shipment.
>
> 4\. Dimensions of unit when bolted together.
>
> 5\. Dimensions of module or sub-section broken down for shipment.
>
> 6\. Complete description of construction materials of unit including
> structural members, housing materials, finishes, access doors,
> hardware, lights, electrical components and controls.
>
> 7\. Complete electrical data for unit including power and control
> wiring diagrams indicating all factory and field wiring requirements.
> Use standard symbols, nomenclature, and markings as set forth by ESI
> in preparing diagrams.
>
> 8\. Complete control diagrams of the items furnished for unit.
>
> 9\. Complete performance data of unit including maximum cooling
> capacity, maximum kilo-Watts (kW) consumption, maximum air-quantities,
> leakage rate data, etc.
>
> 10\. Static pressure of each internal component of the air-handling
> unit.
>
> 11\. Vibration isolator data showing
>
> a\. The equipment identification mark.
>
> b\. The isolator type.
>
> c\. The actual load.
>
> d\. The static deflection expected under the actual load.
>
> e\. Specified minimum static deflection.
>
> f\. The remaining additional deflection to solid after the actual load
> is applied.
>
> g\. The ratio of spring height under actual load to spring diameter.
>
> 12\. Verification that floor deflection beneath the fan shall not
> exceed 0.25 in..
>
> D. The manufacturer is also requested to submit
>
> 1\. At time of delivery all manufacturer\'s recommended spare parts
> lists and prices for unit and accessories to include:
>
> a\. Description of part.
>
> b\. Catalog number of part.
>
> 2\. At time of delivery wiring diagram, installation, operation, and
> maintenance instructions for unit and accessories, sufficiently
> detailed so that the average mechanic, skilled in the trade, can
> install, operate, and perform maintenance operations.
>
> 3\. Certification of unit housing panel thermal/acoustical/leakage
> performance and structural integrity under design conditions.

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

> A. See Section 15010.
>
> B. All rigging and equipment required to get unit to installation
> location shall be provided by the Mechanical contractor.
>
> C. All units shall be cleaned after final assembly and/or testing in
> accordance with these specifications. After the unit is
> alcohol-cleaned, wrap in a protective double-layer plastic bag and
> seal all joints so that the unit can be transported, stored and
> installed without concern for contamination of the cleaned unit.
>
> D. Each cleaned and bagged unit shall then be secured to allow
> shipment and handling, without damage to the cabinet. Shipping base
> shall be suitable for handling and moving. The cleanroom contractor
> shall review and approve the method of packaging and shipment prior to
> the first shipment.
>
> E. The Mechanical contractor shall receive, unload, inspect, store,
> uncrate and install the units at the job site.
>
> F. Any units arriving at the job site that have not been adequately
> protected, per the approved methods mentioned in Paragraph 1.06D or
> have endured damage during shipping, shall be rejected by the
> cleanroom contractor/Sandia National Laboratory (SNL) and must be
> returned to the manufacturer for rework or replacement.
>
> G. The outside of the package or crate shall be adequately marked or
> tagged to indicate its contents by equipment number and weight.

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

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

> A. Webco.
>
> B. Environmental Air Systems.
>
> C. Miller Picking.

**2.02 [MATERIALS]{.underline}**

> A. Galvanized steel in accordance with ASTM A386 or ASTM A525, G-90
> coating, or finished with baked-on enamel; thickness in accordance
> with USS gauges (ga.).
>
> B. Aluminum sheet and plate in accordance with 3003-H14 alloy,
> conforming to ASTM B209.
>
> C. Aluminum extrusions in accordance with 6061-T6 or 6063-T52 alloy,
> conforming to ASTM B221.
>
> D. All interior and exterior surfaces are to be cleaned, primed and
> painted with Fuller O\'Brien \"Wet White\" dry polyester paint. The
> base and structural components shall be painted with color match
> enamel.

**2.03 [EQUIPMENT]{.underline}**

> A. Performance Requirements
>
> 1\. As indicated on the Drawings.
>
> 2\. Design pressures shall include all losses internal and external to
> unit.
>
> B. Identification
>
> 1\. Identify air-handling unit on exterior with minimum 6 in. painted,
> stenciled identification numbers corresponding to designation numbers
> on attached Drawings; locate numbers so they shall be clearly visible
> after installation of equipment.
>
> 2\. Apply designation numbers on manufacturer\'s standard permanent
> nameplate or on stainless steel tag permanently attached to contain
> the following information:
>
> a\. Equipment name.
>
> b\. Equipment number as indicated on the attached Drawings.
>
> c\. Manufacturer\'s name, address, and phone number.
>
> d\. Manufacturer\'s model, serial number, year manufactured.
>
> e\. Design criteria (capacity in standard-cubic-feet-per-minute and
> static pressure drop).
>
> f\. Electrical Characteristics: motor horsepower (hp), rpm, Volts (V),
> phase (ph.) and amperage (A) for main power tie-in.
>
> g\. Purchase order number.

**2.04 [FABRICATION]{.underline}**

> A. Design and Assembly
>
> 1\. Design and assemble units to ensure that each enclosure is
> engineered to withstand all operating pressures at design conditions
> and pressures of project requirements.
>
> 2\. Design structural components of unit equal to or exceeding the
> following external loads with a maximum deflection of 1/8 in. over
> maximum 4-ft. span.
>
> a\. Roof - 75 pounds-per-square-foot (psf)
>
> b\. Walls and Ends - 65 psf
>
> c\. Floor - Equipment weight plus 50 psf
>
> 3\. Design and assemble unit for indoor installation.
>
> 4\. Design and assemble unit to require only the external connecting
> of electrical power, lighting, chilled water, drain piping, control
> tubing, control wiring, and ductwork to provide complete and operable
> systems.
>
> 5\. Fabricate units in sub-sections or modules having the following
> features:
>
> a\. Fabricate so that power wiring can be properly reconnected on
> terminal strips located in junction boxes in adjacent sub-sections or
> modules.
>
> b\. Fabricate so that control wiring can be reconnected by
> reconnecting male and female connectors.
>
> c\. Fabricate so that piping can be reconnected by couplings, unions,
> or flanged joints and tubing by re-connection of tube fittings.
>
> d\. Fabricate so that panel frames and panels can be easily joined
> together in the field by bolting through companion angles or flanges.
>
> e\. Provide adequate lifting lugs, gaskets, flashing materials,
> attachment devices, and sealants to facilitate a complete, airtight,
> watertight, and operable installation.
>
> f\. Independent structural base.
>
> 6\. Furnish similar equipment, such as motors, coils, filters, and
> dampers, from the same manufacturer.
>
> 7\. Factory install all internal components, conduits, electrical
> conductors, junction boxes, tubing, and piping.
>
> 8\. Where holes are provided in floor or wall panels, for ductwork,
> piping, or conduits, exposed edges of insulation and panel facings
> shall be protected by structural steel members or steel sleeves
> continuously welded in place. Holes shall be sealed airtight.
>
> 9\. Removable panels shall be installed and located to facilitate fan
> removal.
>
> 10\. Conduits shall be sealed with Nelson\'s Flame Seal or approved
> equal.
>
> 11\. All internal piping and insulation shall be according to Sections
> 15051, 15250, and 15401.
>
> 12\. Fabricate the unit with [all]{.underline} field connections
> exterior to the unit.
>
> B. Unit Casing and Base
>
> 1\. Unit casing is to be fabricated from brake-formed panels of
> 16-gauge 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 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. Following the coating, the
> sheets shall be annealed to produce a zinc-iron alloy to meet ASTM
> A527. Bending and forming operations do not remove the alloy bond.
>
> 2\. Welded wall and roof sections shall be completely covered with an
> acoustical and thermal efficient 2\", 3 pound unfaced fiberglass
> insulation which complies with all requirements of NFPA Bulletin No.
> 90-A. The insulation will not mold, rot, or sustain vermin, and will
> not corrode metals or disintegrate under vibrations. The material is
> to be odorless, will not absorb odors, and shall resist water moisture
> permanently without chemical breakdown. A double-wall casing shall
> incorporate a perforated interior liner of 22-gauge galvanized steel.
> Media is to be lined with a 4-millimeter (4mm) mylar.
>
> 3\. All compartments shall be fully accessible through insulated,
> double-wall 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.
>
> 4\. Internal compartment, 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.
>
> 5\. 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.
>
> 6\. An integral structural steel weldment base frame shall support the
> unit\'s casing all internal components. Base frame is to be a
> structural member engineered for roof curb mounting such that the base
> overhangs and curb. Formed metal base construction techniques are not
> acceptable. The base frame shall include four (4) or more listing 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
> oilcanning 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-gauge 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\", 3 pound
> fiberglass. Insulation is to be retained with a 20 gauge solid
> galvanized steel liner. During component installation, no holes or
> bolts are allowed to penetrate the floor pan.
>
> 7\. Sound Transmission Loss Values: The following casing transmission
> loss values are required as a minimum and shall be obtained by a
> 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 1000 2000 4000 STC

PERF LINER 21 26 31 42 50 58 37

SOLID LINER 23 41 47 50 56 63 47

> 8\. The unit shall incorporate appropriate sections with components to
> achieve the scheduled performances in the arrangement shown in the
> attached sketches.
>
> 9\. Structural integrity of the completed enclosure shall provide for
> maximum panel deflections of 1/200th of span when enclosure is
> subjected to an air-pressure test of 10-in. water gage (w.g.), both
> positive and negative.
>
> 10\. Panel to panel joints shall be flange and gasket type having
> factory installed insulation that fully fills joint when assembled.
>
> C. Electrical
>
> 1\. Lighting
>
> a\. Provide for a separate power feed for the lighting.
>
> b\. Provide 100 watt, watertight, incandescent fixtures to provide
> lighting levels recommended by IES.
>
> c\. Install wall mounted switches for each section as required.
>
> d\. Provide outlet boxes, conduits, and conductors to complete an
> operable installation.
>
> e\. Terminate conductors in factory mounted control panel on a
> terminal strip so that only one connection is required for lighting
> system and receptacle (weather proof GFI). The control panel shall be
> mounted external to the unit casing.
>
> 2\. Power
>
> a\. Provide for a 480 second power feed for all other equipment.
>
> b\. Install conduits, conductors, junction boxes, etc., as required
> for complete and operable system.
>
> c\. Provide the following electrical components:
>
> 1\) Install control panel on exterior face of air-handling unit.
>
> 2\) Install conduit and conductors from motor to control panel for
> single point connection.
>
> 3\. Fan motor shall be factory wired to NEMA 1, N-F disconnect located
> in the units control panel for field connection by others. Disconnect
> shall be operable from the exterior of the control panel.
>
> a\. All transformers, terminal strips and wiring to be furnished any
> factory installed.
>
> b\. 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.
>
> c\. Electrical components, devices and, materials shall be sized in
> accordance with NEC requirements.
>
> d\. Wiring and Conduits
>
> 1\) All electrical wiring shall be installed in EMT,
> electro-galvanized thin-wall steel electrical metallic tub­ing, dipped
> galvanized steel conduit, minimum size of 3/4 in.. Do not run EMT
> conduit where accessible for peo­ple to stand upon or to use for
> support. Use liquid­ tight flexible metal conduit at motors,
> transformers, any device subject to vibration and where rigid conduit
> is not applicable; however, each length of flexible con­duit shall not
> exceed 24 in..
>
> 2\) Provide low voltage wire and cable with conductors of soft-drawn
> annealed copper, Class \"B\" stranding, which is free of kinks, cuts,
> and abrasions at the time of installation, in accordance with the
> following schedule:
>
> a\) Underwriters Type THHN/THWN (90-deg. Celsius (C) dry, 75-deg. C
> wet), single conductor, for general use in dry and wet locations as
> branch circuits and control wiring. (No. 12 AWG min. for branch
> circuits; No. 14 AWG min. for control wiring.)
>
> b\) Underwriters Type XHHW (75-deg. C wet/90-deg. C dry), single
> conductor, as feeder circuits No. 6 AWG and larger.
>
> 3\) Color Coding
>
> a\) Provide color coding for single and multi-conductor power circuits
> as follows:
>
> [Voltage]{.underline} [O/A]{.underline} [O/B]{.underline}
> [O/C]{.underline} [Neutral]{.underline}
>
> 240 Black Red Blue White
>
> and below
>
> 250 - 600BrownOrangeYellowWhite
>
> w/Tracer
>
> \- For specified insulations and jackets not manufactured with
> integral colors, use conductors with black insulation or jacket and
> color coding tape.
>
> \- Color code conductors entering boxes, troughs, cabinets, and other
> enclosures.
>
> \- lor code conductors in wire-ways, trenches, and other locations
> where conductors are continuously accessible at intervals not
> exceeding 5 ft..
>
> b\) Insulated Equipment Ground - Green.
>
> c\) Control Cables
>
> \- Single Conductors: Red (AC), Blue (DC).
>
> \- Multi-conductor: Comply with ICEA S-66-524, \"Method I\", Table
> K-2.
>
> d\) Signal Cables: Comply with ICEA S-82-552, \"Method 9\", Table E-2.
> In addition, number multiple pairs, triads, and quads.
>
> e\) Thermocouple Extension Wire: ANSI MC96.1 and ICEA S-82-552, Table
> E-4.
>
> 4\) Connections between conduits and steel boxes shall be made with
> double lock nuts and grounding bushings.
>
> 5\) Wiring and wire markings shall be in accordance with ESI and NEC,
> and NFPA 79.
>
> 6\) A grounding conductor with green insulation shall be installed in
> all raceways containing conductors with a potential greater than 24 V.
> Grounding conductors shall be bonded to all raceways, boxes, equipment
> enclosures, motors, and fixtures.
>
> e\. Control Panels
>
> 1\) Provide centrally located electrical panels exterior to the unit
> casing having appropriately sized and identified terminal blocks for
> lighting circuits and control wiring and main power feed.
>
> 2\) Terminals shall be 600-V rated, track mounted, tubular screw type,
> with pressure plate and separate marking strip.
>
> f\. All control components, wiring, and auxiliaries as designated as
> \"Furnished by unit manufacturer\" on Control Drawing 104658 C9
> through C14 shall be furnished and installed at the factory. Reference
> Control Drawing 104663 C5 for typical control box wiring diagram.
>
> D. Module Component Requirements
>
> 1\. Filters
>
> a\. Final Filters - Air 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.
>
> b\. Filter Media - 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
> 90-95 percent on ASHRAE Test Standard 52-76. It shall have an average
> arrestance of  97 percent on that standard. Initial resistance at 50
> fpm approach velocity shall not exceed 1 inch w.g.
>
> Final filter media is supplied in supply section only. Final filter
> media will mount glidepack aluminum extrusions suitable for side
> access service.
>
> Final filter media shall be FARR RF-15 or approved equal.
>
> 2\. Magnehelic Gauges: Dwyer Gauges or approved equal for the filter
> banks shall be factory mounted on the face of the unit control panel.
> The pressure gage shall have a 0 to 3 in. w.g. range.
>
> 3\. Cooling Coils
>
> a\. Primary Surface shall be round seamless 5/8-in. O.D. .020 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 tube 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.
> Fin height and length shall be as specified on schedule.
>
> 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 pounds 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 will be
> furnished and installed by contractor external to the unit casing.
>
> g\. Cooling coils shall be ARI certified for scheduled performance and
> bear the ARI seal. Coils shall be manufactured by Heatcraft or
> approved equal.
>
> h\. Chilled water piping shall be internally headered and extend
> through the casing and be sealed airtight at the factory.
>
> I. Each coil shall have either a flanged connection or union inside
> the unit to facilitate coil removal.
>
> 4\. Flexible Connections
>
> a\. Provide flexible connections between unit components as required
> for vibration isolation.
>
> b\. Flexible connections shall be made of neoprene coated glass fabric
> of fire, water and weather resistant cotton.
>
> c\. Flexible connections shall be installed with sufficient slack to
> prevent transmission of vibration.
>
> d\. Flexible connectors shall be suitable for duct pressure up to
> 10-in. w.g.
>
> e\. Arrange components in each module for easy accessibility and
> servicing.
>
> f\. Manufacturer and Type - \"Ventglas\" by Ventfabrics, Inc. or
> approved equal.
>
> 5\. Dampers
>
> a\. Automatically-operated dampers shall be of the multi-blade,
> parallel-blade type. Single blade dampers are not acceptable.
>
> b\. Frames shall be fabricated of 6-in. wide by 16-USS-ga. (minimum)
> roll-formed galvanized steel or 6-in. galvanized structural channel
> with integral reinforcing ribs and mounting flanges for ease of
> installation. Provide a 2-in., mounting flange.
>
> c\. Blades shall be airfoil and shall be fabricated of 16-USS-ga.
> (minimum) galvanized steel and sized no greater than 6-in. width or
> 48-in. length.
>
> d\. Blade shafts shall be continuous from bearings one side of the
> frame to the bearings on other side of the frame. The blade shafts
> shall be 1/2-in. hex or square, galvanized or cadmium plated steel. A
> 6-in. shaft extension shall be provided for the damper operator.
>
> e\. Stainless steel sleeve or oil-impregnated bronze bearings mounted
> in the damper frame shall be provided for the blade shafts.
>
> f\. Linkage shall be a galvanized or cadmium plated steel assembly of
> interconnecting linkage attached to the shaft of each damper blade.
> This linkage is to be mounted external to the airstream.
>
> g\. Damper shall be provided with electric actuators (factory
> installed) as indicated on the Referenced Control Drawings.
>
> h\. Dampers shall be low-leakage type.
>
> i\. Ruskin Model CD50 or an approved equal.
>
> 6\. Supply Fan
>
> a\. The fans shall be of the centrifugal plenum designed without a
> scroll type housing. Fans shall incorporate a nonoverloading type
> backward inclined airfoil blade wheel, heavy gauge reinforced steel
> inlet plate, structural steel frame, and shaft and bearings in AMCA
> arrangement #3 configuration. Each fan shall be run fully assembled at
> the factory, prior to shipment, at the operating RPM or the maximum
> class RPM. The total fan assembly shall be checked for balance and
> compared against the acceptable levels on the Rathbone Chart.
>
> b\. Frame and Inlet Plate: 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 wheel. 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 backplates. No. partial welding will be
> acceptable.
>
> d\. Class I and II wheels shall have cast iron hubs. All wheels shall
> be \"true\" lines, 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 system 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-greaseable 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 finished coat as previously described in
> Section 2.02D 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
> 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, and fan wheel 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. Vibration isolators
> shall be selected for 95 percent efficiency.
>
> k\. Furnish extended copper lubrication lines from fan bearings to
> zerk fitting on unit casing, mounted and prepacked 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 rive in place. Drive
> assembly to include an expanded metal belt guard with an RPM
> measurement port.
>
> **2.05 [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: Based on 40 deg. C ambient except as otherwise
> indicated.
>
> 8\. Enclosure: Open drip-proof, unless noted otherwise.
>
> 9\. Motor Speed: Single, multiple, or variable as indicated.
>
> 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\. 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.
>
> 4\. 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.
>
> 5\. 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.
>
> 6\. 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 [INSTALLATION/APPLICATION/ERECTION]{.underline}**

> A. Unit manufacturer shall provide a qualified supervisor to instruct
> and supervise the Contractor in rigging, erecting, pre-operation
> check-out and starting of unit at time of installation.
>
> B. Unit manufacturer shall provide a qualified supervisor to instruct
> the SNL\'s personnel on maintenance and operation of the air-hand­ling
> unit for a minimum of 4 hours after final acceptance.
>
> C. Unit manufacturer shall provide the necessary installation
> materials required for installation of the unit.

3.02 [FIELD QUALITY CONTROL]{.underline}

> A. The unit will be field tested by an independent Testing, Adjusting,
> and Balancing Con­tractor after installation. Testing shall be
> basically the same as required under Paragraph 1.02, Factory Tests
> above. Any deficiencies found at this time shall be corrected by the
> unit manufacturer at no cost to SNL.

**3.03 [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.
>
> END OF SECTION

EXCEPT FOR ATTACHMENTS

SK AHU-5, 6, 7, 8, 9, 10, 11, 12, 13, 14