23 00 00 AIR SUPPLY DISTRIBUTION VENTILATION AND EXHAUST.doc

SECTION 23 00 00

AIR SUPPLY, DISTRIBUTION, VENTILATION, AND EXHAUST SYSTEMS

PART 1 GENERAL

1.1 REFERENCES

1.1.1 The publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by the basic designation only. Unless other wise noted, the latest published version and/or revision shall be used.

1.1.1.1 AIR CONDITIONING CONTRACTORS OF AMERICA (ACCA)

a. ACCA Manual 4 Installation Techniques for Perimeter Heating & Cooling; 11th Edition

1.1.1.2 AIR MOVEMENT AND CONTROL ASSOCIATION INTERNATIONAL (AMCA)

a. AMCA 201 Fans and Systems

b. AMCA 210 Laboratory Methods of Testing Fans for Aerodynamic Performance Rating

c. AMCA 220 Test Methods for Air Curtain Units

d. AMCA 300 Reverberant Room Method for Sound Testing of Fans

e. AMCA 301 Methods for Calculating Fan Sound Ratings from Laboratory Test Data

1.1.1.3 AIR-CONDITIONING AND REFRIGERATION INSTITUTE (ARI)

a. ARI 260 Sound Rating of Ducted Air Moving and Conditioning Equipment

b. ARI 410 Standard for Forced-Circulation Air-Cooling and Air-Heating Coils

c. ARI DCAACP (Online) Directory of Certified Applied Air-Conditioning Products

1.1.1.4 AMERICAN BEARING MANUFACTURERS ASSOCIATION (ABMA)

a. ABMA 11 Load Ratings and Fatigue Life for Roller Bearings

b. ABMA 9 Load Ratings and Fatigue Life for Ball Bearings

1.1.1.5 AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)

a. ANSI S12.51 Precision Methods for the Determination of Sound Power Levels of Discrete-Frequency and Narrow-Band Noise Sources in Reverberation Rooms

1.1.1.6 AMERICAN SOCIETY OF HEATING, REFRIGERATING AND AIR-CONDITIONING ENGINEERS (ASHRAE)

a. ASHRAE 15 Safety Code for Refrigeration

b. ASHRAE 52.2 Method of Testing General Ventilation Air-Cleaning Devices for Removal Efficiency by Particle Size

c. ASHRAE 62.1 Ventilation for Acceptable Indoor Air Quality

d. ASHRAE 68 Laboratory Method of Testing to Determine the Sound Power In a Duct

e. ASHRAE 70 Method of Testing for Rating the Performance of Air Outlets and Inlets

1.1.1.7 ASTM INTERNATIONAL (ASTM)

a. ASTM A 123 Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products

b. ASTM A 53 Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless

c. ASTM A 924 Standard Specification for General Requirements for Steel Sheet, Metallic-Coated by the Hot-Dip Process

d. ASTM B 117 Standing Practice for Operating Salt Spray (Fog) Apparatus

e. ASTM B 152 Standard Specification for Copper Sheet, Strip, Plate, and Rolled Bar

f. ASTM B 209 Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate

g. ASTM B 280 Standard Specification for Seamless Copper Tube for Air Conditioning and Refrigeration Field Service

h. ASTM C 1071 Standard Specification for Fibrous Glass Duct Lining Insulation (Thermal and Sound Absorbing Material)

i. ASTM C 553 Standard Specification for Mineral Fiber Blanket Thermal Insulation for Commercial and Industrial Applications

j. ASTM C 916 Standard Specification for Adhesives for Duct Thermal Insulation

k. ASTM D 1654 Evaluation of Painted or Coated Specimens Subjected to Corrosive Environments

l. ASTM D 1785 Standard Specification for Poly(Vinyl Chloride) (PVC), Plastic Pipe, Schedules 40, 80, and 120

m. ASTM D 2466 Standard Specification for Poly(Vinyl Chloride) (PVC) Plastic Pipe Fittings, Schedule 40

n. ASTM D 2564 Standard Specification for Solvent Cements for Poly(Vinyl Chloride) (PVC) Plastic Piping Systems

o. ASTM D 2855 Standard Practice for Making Solvent-Cemented Joints with Poly(Vinyl Chloride) (PVC) Pipe and Fittings

p. ASTM D 3359 Measuring Adhesion by Tape Test

q. ASTM D 520 Zinc Dust Pigment

r. ASTM E 2016 Standard Specification for Industrial Woven Wire Cloth

s. ASTM E 84 Standard Test Method for Surface Burning Characteristics of Building Materials

t. ASTM F 1040 Standard Specification for Filter Units, Air Conditioning, Viscous - Impingement and Dry Types, Replaceable

1.1.1.8 NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)

a. NEMA ICS 6 Standard for Industrial Controls and Systems Enclosures

b. NEMA MG 1 Standard for Motors and Generators

c. NEMA MG 10 Energy Management Guide for Selection and Use of Fixed Frequency Medium AC Squirrel-Cage Polyphase Induction Motors

d. NEMA MG 11 Energy Management Guide for Selection and Use of Single Phase Motors

1.1.1.9 NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

a. NFPA 70 National Electrical Code

b. NFPA 90A Standard for the Installation of Air Conditioning and Ventilating Systems

1.1.1.10 SHEET METAL AND AIR CONDITIONING CONTRACTORS' NATIONAL ASSOCIATION (SMACNA)

a. SMACNA HVAC Duct Const Stds HVAC Duct Construction Standards - Metal and Flexible

b. SMACNA Industry Practice Accepted Industry Practice for Industrial Duct Construction

c. SMACNA Install Fire Damp HVAC Fire, Smoke and Radiation Damper Installation Guide for HVAC Systems

d. SMACNA Leakage Test Mnl HVAC Air Duct Leakage Test Manual

1.1.1.11 UNDERWRITERS LABORATORIES (UL)

a. UL 181 Standard for Factory-Made Air Ducts and Air Connectors

b. UL 1995 Standard for Heating and Cooling Equipment

c. UL 214 Tests for Flame-Propagation of Fabrics and Films

d. UL 555 Standard for Fire Dampers

e. UL 555S Smoke Dampers

f. UL 586 Standard for High-Efficiency Particulate, Air Filter Units

g. UL 705 Standard for Power Ventilators

h. UL 723 Standard for Test for Surface Burning Characteristics of Building Materials

i. UL 900 Standard for Air Filter Units

j. UL 94 Tests for Flammability of Plastic Materials for Parts in Devices and Appliances

k. UL Bld Mat Dir Building Materials Directory

l. UL Electrical Construction Electrical Construction Equipment Directory

m. UL Fire Resistance Fire Resistance Directory

1.2 COORDINATION OF TRADES

1.2.1 Furnish ductwork, piping offsets, fittings, and accessories as required to provide a complete installation and to eliminate interference with other construction.

1.3 DELIVERY AND STORAGE

1.3.1 Store equipment at the jobsite so that it is protected from the weather, humidity and temperature variations, dirt and dust, or other contaminants. Additionally, cap or plug all pipes until installed.

1.4 FIELD MEASUREMENTS

1.4.1 After becoming familiar with all details of the work, the Contractor shall verify all dimensions in the field, and shall advise the Contracting Officer of any discrepancy before performing the work.

1.5 SUBMITTALS

1.5.1 Government approval may be required on any of the following items. Items requiring submittals will be listed on the AF Form 66. Provide copies of all submittals per the requirements in Section 01 33 00, Submittal Procedures, or as listed on the AF Form 66.

1.5.1.1 SD-02 Shop Drawings

a. Drawings

(1) Drawings showing equipment layout, including assembly and installation details and electrical connection diagrams; ductwork layout showing the location of all supports and hangers, typical hanger details, gauge reinforcement, reinforcement spacing rigidity classification, and static pressure and seal classifications. Include any information required to demonstrate that the system has been coordinated and will properly function as a unit on the drawings and shall show equipment relationship to other parts of the work, including clearances required for operation and maintenance.

1.5.1.2 SD-03 Product Data

a. Components and Equipment

(1) Manufacturer's catalog data included with the detail drawings for the following items. Highlight the data to show model, size, options, etc., that are intended for consideration. provide adequate data to demonstrate compliance with contract requirements for the following:

(a) Piping Components

(b) Ductwork Components

(c) Air Systems Equipment

(d) Air Handling Units

(e) Energy Recovery Units

(f) Terminal Units

b. Test Procedures

(1) Proposed test procedures and test schedules for the ductwork leak test, and performance tests of systems, at least 2 weeks prior to the start of related testing.

c. Diagrams

(1) Proposed diagrams, at least 2 weeks prior to start of related testing. System diagrams that show the layout of equipment, piping, and ductwork, and typed condensed operation manuals explaining preventative maintenance procedures, methods of checking the system for normal, safe operation, and procedures for safely starting and stopping the system shall be framed under glass or laminated plastic. After approval, these items shall be posted where directed.

d. Operation and Maintenance Training

(1) Proposed On-site Training schedule, submitted concurrently with the Operation and Maintenance Manuals.

1.5.1.3 SD-06 Test Reports

a. Performance Tests

(1) Test reports for the ductwork leak test, and performance tests in booklet form, upon completion of testing. Document phases of tests performed including initial test summary, repairs/adjustments made, and final test results in the reports.

b. Damper Acceptance Test

(1) Proposed schedule, at least 2 weeks prior to the start of test.

1.5.1.4 SD-10 Operation and Maintenance Data

a. Operation and Maintenance Manuals

(1) Provide manuals at least 2 weeks prior to field training. Submit data complying with the requirements specified in Section 01 78 23 Operation and Maintenance Data.

PART 2 PRODUCTS

2.1 STANDARD PRODUCTS

2.1.1 Provide Components and equipment that are "standard products" of a manufacturer regularly engaged in the manufacturing of products that are of a similar material, design and workmanship. "Standard products" is defined as being in satisfactory commercial or industrial use for 2 years before bid opening. The 2-year manufacturer's experience shall include applications of components and equipment under similar circumstances and of similar size. The 2 years must be satisfactorily completed by a product that is sold on the commercial market through advertisements, manufacturers' catalogs, or brochures. Products having less than a 2-year field service record will be acceptable if a certified record of satisfactory field operation, for not less than 6000 hours exclusive of the manufacturer's factory tests, can be shown. The equipment items shall be supported by a service organization.

2.2 NAMEPLATES

2.2.1 All equipment shall have a nameplate, installed by the manufacturer, that identifies the manufacturer's name, address, type or style, and model or serial number.

2.3 EQUIPMENT GUARDS AND ACCESS

2.3.1 Belts, pulleys, chains, gears, couplings, projecting setscrews, keys, and other rotating parts exposed to personnel contact shall be fully enclosed or guarded according to OSHA requirements. High temperature equipment and piping exposed to contact by personnel or where it creates a potential fire hazard shall be properly guarded or covered with insulation of a type specified.

2.4 ELECTRICAL WORK

2.4.1 Provide motors, controllers, integral disconnects, contactors, and controls with their respective pieces of equipment, except controllers indicated as part of motor control centers. Provide electrical equipment, including motors and wiring, as specified in Section 26 20 00 Interior Distribution System. Manual or automatic control and protective or signal devices required for the operation specified and control wiring required for controls and devices specified, but not shown, shall be provided. For packaged equipment, the manufacturer shall provide controllers including the required monitors and timed restart.

2.4.2 For single-phase motors, provide high-efficiency type, fractional-horsepower alternating-current motors, including motors that are part of a system, in accordance with NEMA MG 11.

2.4.3 For polyphase motors, provide squirrel-cage medium induction motors, including motors that are part of a system, and that meet the efficiency ratings for premium efficiency motors in accordance with NEMA MG 1. Select premium efficiency polyphase motors in accordance with NEMA MG 10.

2.4.4 Provide motors in accordance with NEMA MG 1 and of sufficient size to drive the load at the specified capacity without exceeding the nameplate rating of the motor. Motors shall be rated for continuous duty with the enclosure specified. Motor duty requirements shall allow for maximum frequency start-stop operation and minimum encountered interval between start and stop. Motor torque shall be capable of accelerating the connected load within 20 seconds with 80 percent of the rated voltage maintained at motor terminals during one starting period. Provide motor starters complete with thermal overload protection and other necessary appurtenances. Motor bearings shall be fitted with grease supply fittings and grease relief to outside of the enclosure.

2.4.5 Where two-speed or variable-speed motors are indicated, solid-state variable-speed controllers may be provided to accomplish the same function. Use solid-state variable-speed controllers for motors rated 10 hp or less and adjustable frequency drives for larger motors. Provide variable frequency drives for motors as specified in Section 26 29 23 Variable Frequency Drive Systems Under 600 Volts.

2.5 INDOOR AIR QUALITY

2.5.1 All equipment and components furnished as part of this Section shall comply with the requirements of ASHRAE 62.1 unless more stringent requirements are specified herein.

2.6 DUCT SYSTEMS

2.6.1 Metal Ductwork

All aspects of metal ductwork construction, including all material, quality, fittings and components, shall comply with SMACNA HVAC Duct Const Stds unless otherwise specified. Elbows shall be radius type with a centerline radius of 1.5 times the width or diameter of the duct where space permits. Otherwise, elbows having a minimum radius equal to the width or diameter of the duct or square elbows with factory fabricated turning vanes may be used. Static pressure ½ through 2-inch wg. ductwork shall meet the requirements of Seal Class C. Static pressure 3 through 10 inch wg. ductwork shall meet the requirements of Seal Class A. All ductwork in VAV systems upstream of the VAV boxes shall meet the requirements of Seal Class A. Sealants shall conform to fire hazard classification specified in Section 23 07 00 Thermal Insulation for Mechanical Systems and shall be suitable for the range of air distribution and ambient temperatures that it will be exposed to. Do not use pressure sensitive tape as a sealant. Spiral lock seam duct, and flat oval shall be made with duct sealant and locked with not less than 3 equally spaced drive screws or other approved methods indicated in SMACNA HVAC Duct Const Stds. Apply the sealant to the exposed male part of the fitting collar so that the sealer will be on the inside of the joint and fully protected by the metal of the duct fitting. Apply one brush coat of the sealant over the outside of the joint to at least 50 mm( 2 inch) band width covering all screw heads and joint gap. Dents in the male portion of the slip fitting collar will not be acceptable. Fabricate outdoor air intake ducts and plenums with watertight soldered or brazed joints and seams.

2.6.1.1 Metallic Flexible Duct

a. Duct shall conform to UL 181 and NFPA 90A with factory-applied insulation, vapor barrier, and end connections. Fire hazard rating of duct assembly shall not exceed 25 for flame spread and 50 for smoke developed. Proved ducts designed for working pressures of two inches water gauge positive and 1.5 inches water gauge positive. Flexible round duct length shall not exceed five feet. Secure connections by applying adhesive for two inches over rigid duct, apply flexible duct two inches over rigid duct, apply metal clamp, and provide minimum of three No. 8 sheet metal screws through clamp and rigid duct.

b. Inner duct core: Flexible core shall be interlocking spiral or helically corrugated and constructed of zinc-coated steel, aluminum, or stainless steel; or shall be constructed of inner liner of continuous galvanized spring steel wire helix fused to continuous, fire-retardant, flexible vapor barrier film, inner duct core.

c. Insulation: Inner duct core shall be insulated with mineral fiber blanket type flexible insulation, minimum of one inch thick. Insulation shall be covered on exterior with manufacturer's standard fire retardant vapor barrier jacket for flexible round duct.

2.6.1.2 General Service Duct Connectors

a. Provide a flexible duct connector approximately 6 inches in width where sheet metal connections are made to fans or where ducts of dissimilar metals are connected. For round/oval ducts, secure the flexible material by stainless steel or zinc-coated, iron clinch-type draw bands. For rectangular ducts, install the flexible material locked to metal collars using normal duct construction methods. The composite connector system shall comply with UL 214 and be classified as "flame-retarded fabrics" in UL Bld Mat Dir.

2.6.2 Ductwork Accessories

2.6.2.1 Duct Access Doors

a. Provide hinged access doors conforming to SMACNA HVAC Duct Const Stds in ductwork and plenums where indicated and at all air flow measuring primaries, automatic dampers, fire dampers, coils, thermostats, and other apparatus requiring service and inspection in the duct system. Provide access doors upstream and downstream of air flow measuring primaries and heating and cooling coils. Doors shall be minimum 15 x 18 inches, unless otherwise shown. Where duct size will not accommodate this size door, the doors shall be made as large as practicable. Equip doors 24 x 24 inches or larger with fasteners operable from inside and outside the duct. Use insulated type doors in insulated ducts.

2.6.2.2 Fire Dampers

a. Use 1.5 hour rated fire dampers unless otherwise indicated. Fire dampers shall conform to the requirements of NFPA 90A and UL 555. The Contractor shall perform the fire damper test as outlined in NFPA 90A. Provide a pressure relief damper upstream of the fire damper. If the ductwork connected to the fire damper is to be insulated then this pressure relief damper shall be factory insulated. Fire dampers shall be automatic operating type and shall have a dynamic rating suitable for the maximum air velocity and pressure differential to which it will be subjected. Fire dampers shall be approved for the specific application, and shall be installed according to their listing. Fire dampers shall be equipped with a steel sleeve or adequately sized frame installed in such a manner that disruption of the attached ductwork, if any, will not impair the operation of the damper. Equip sleeves or frames with perimeter mounting angles attached on both sides of the wall or floor opening. Construct ductwork in fire-rated floor-ceiling or roof-ceiling assembly systems with air ducts that pierce the ceiling of the assemblies in conformance with UL Fire Resistance. Fire dampers shall be curtain type with damper blades out of the air stream. Dampers shall not reduce the duct or the air transfer opening cross-sectional area. Install dampers so that the centerline of the damper depth or thickness is located in the centerline of the wall, partition or floor slab depth or thickness. Unless otherwise indicated, comply with the installation details given in SMACNA Install Fire Damp HVAC and in manufacturer's instructions for fire dampers. Perform acceptance testing of fire dampers per paragraph Fire Damper Acceptance Test and NFPA 90A.

2.6.2.3 Manual Balancing Dampers

a. Furnish manual balancing dampers with accessible operating mechanisms. Use chromium plated operators (with all exposed edges rounded) in finished portions of the building. Manual volume control dampers shall be operated by locking-type quadrant operators. Dampers shall be 2 gauges heavier than the duct in which installed. Unless otherwise indicated, multileaf dampers shall be opposed blade type with maximum blade width of 12 inches. Provide access doors or panels for all concealed damper operators and locking setscrews. Unless otherwise indicated, the locking-type quadrant operators for dampers, when installed on ducts to be thermally insulated, shall be provided with stand-off mounting brackets, bases, or adapters to provide clearance between the duct surface and the operator not less than the thickness of the insulation. Stand-off mounting items shall be integral with the operator or standard accessory of the damper manufacturer.

2.6.2.4 Air Deflectors and Branch Connections

a. Provide air deflectors at all duct mounted supply outlets, at takeoff or extension collars to supply outlets, at duct branch takeoff connections, and at 90 degree elbows, as well as at locations as indicated on the drawings or otherwise specified. Conical branch connections or 45 degree entry connections may be used in lieu of deflectors for branch connections. Furnish all air deflectors, except those installed in 90 degree elbows, with an approved means of adjustment. Adjustment shall be made from easily accessible means inside the duct or from an adjustment with sturdy lock on the face of the duct. When installed on ducts to be thermally insulated, external adjustments shall be provided with stand-off mounting brackets, integral with the adjustment device, to provide clearance between the duct surface and the adjustment device not less than the thickness of the thermal insulation. Air deflectors shall be factory-fabricated units consisting of curved turning vanes or louver blades designed to provide uniform air distribution and change of direction with minimum turbulence or pressure loss. Air deflectors shall be factory or field assembled. Adjustment shall be easily made from the face of the diffuser or by position adjustment and lock external to the duct. Stand-off brackets shall be provided on insulated ducts and are described herein. Fixed air deflectors, also called turning vanes, shall be provided in 90 degree elbows.

2.6.3 Diffusers, Registers, and Grilles

Units shall be factory-fabricated of steel, corrosion-resistant steel, or aluminum and shall distribute the specified quantity of air evenly over space intended without causing noticeable drafts, air movement faster than 50 fpm in occupied zone, or dead spots anywhere in the conditioned area. Outlets for diffusion, spread, throw, and noise level shall be as required for specified performance. Performance shall be certified according to ASHRAE 70. Inlets and outlets shall be sound rated and certified according to ASHRAE 70. Sound power level shall be as indicated. Diffusers and registers shall be provided with volume damper with accessible operator, unless otherwise indicated; or if standard with the manufacturer, an automatically controlled device will be acceptable. Volume dampers shall be opposed blade type for all diffusers and registers, except linear slot diffusers. Provide linear slot diffusers with round or elliptical balancing dampers. Where the inlet and outlet openings are located less than 7 feet above the floor, they shall be protected by a grille or screen according to NFPA 90A.

2.6.3.1 Diffusers

a. Diffuser types shall be as indicated. Furnish ceiling mounted units with anti-smudge devices, unless the diffuser unit minimizes ceiling smudging through design features. Provide diffusers with air deflectors of the type indicated. Air handling troffers or combination light and ceiling diffusers shall conform to the requirements of UL Electrical Construction for the interchangeable use as cooled or heated air supply diffusers or return air units. Install ceiling mounted units with rims tight against ceiling. Provide sponge rubber gaskets between ceiling and surface mounted diffusers for air leakage control. Suitable trim shall be provided for flush mounted diffusers. Duct collar connecting the duct to diffuser shall be airtight and shall not interfere with volume controller. Return or exhaust units shall be similar to supply diffusers.

2.6.3.2 Registers and Grilles

a. Units shall be four-way directional-control type, except that return and exhaust registers may be fixed horizontal or vertical louver type similar in appearance to the supply register face. Furnish registers with sponge-rubber gasket between flanges and wall or ceiling. Install wall supply registers at least 6 inches below the ceiling unless otherwise indicated. Locate return and exhaust registers 6 inches above the floor unless otherwise indicated. Four-way directional control may be achieved by a grille face which can be rotated in 4 positions or by adjustment of horizontal and vertical vanes. Grilles shall be as specified for registers, without volume control damper.

2.6.3.3 Registers

a. Double-deflection supply registers. Provide manufacturer-furnished volume dampers. Volume dampers shall be of the group-operated, opposed-blade type and key adjustable by inserting key through face of register. Operating mechanism shall not project through any part of the register face. Automatic volume control devices will be acceptable. Provide exhaust and return registers as specified for supply registers, except that exhaust and return registers shall have a single set of nondirectional face bars or vanes having the same appearance as the supply registers. Set face bars or vanes at degrees indicated.

2.6.4 Louvers

2.6.4.1 Louvers for installation in exterior walls that are associated with the air supply and distribution system shall be as specified in Section 08 91 00 Metal Wall and Door Louvers.

2.6.5 Bird Screens and Frames

2.6.5.1 Bird screens shall conform to ASTM E 2016, No. 2 mesh, aluminum or stainless steel. Aluminum screens shall be rated "medium-light". Stainless steel screens shall be rated "light". Frames shall be removable type, and fabricated from either stainless steel or extruded aluminum.

2.7 AIR SYSTEMS EQUIPMENT

2.7.1 Fans

Fans shall be tested and rated according to AMCA 210. Calculate system effect on air moving devices in accordance with AMCA 201 where installed ductwork differs from that indicated on drawings. Install air moving devices to minimize fan system effect. Where system effect is unavoidable, determine the most effective way to accommodate the inefficiencies caused by system effect on the installed air moving device. The sound power level of the fans shall not exceed 85 dBA when tested per AMCA 300 and rated per AMCA 301. All fans shall have an AMCA seal. Connect fans to the motors either directly or indirectly with V-belt drive. Use V-belt drives designed for not less than 150 percent of the connected driving capacity. Motor sheaves shall be variable pitch for 25 hp and below and fixed pitch as defined by ARI Guideline D. Select variable pitch sheaves to drive the fan at a speed which will produce the specified capacity when set at the approximate midpoint of the sheave adjustment. When fixed pitch sheaves are furnished, provide a replaceable sheave when needed to achieve system air balance. Provide motors for V-belt drives with adjustable rails or bases. Provide removable metal guards for all exposed V-belt drives, and provide speed-test openings at the center of all rotating shafts. Provide fans with personnel screens or guards on both suction and supply ends, except that the screens need not be provided, unless otherwise indicated, where ducts are connected to the fan. Provide fan and motor assemblies with vibration-isolation supports or mountings as indicated. Use vibration-isolation units that are standard products with published loading ratings. Select each fan to produce the capacity required at the fan static pressure indicated. Sound power level shall be as indicated. Obtain the sound power level values according to AMCA 300. Standard AMCA arrangement, rotation, and discharge shall be as indicated. Power ventilators shall conform to UL 705 and shall have a UL label.

2.7.1.1 Axial Flow Fans

a. Axial flow fans shall be complete with drive components and belt guard, and shall have a steel housing, cast fan wheel, cast or welded steel diffusers, fan shaft, bearings, and mounting frame as a factory-assembled unit. Fan wheels shall have radially projecting blades of airfoil cross-section and shall be dynamically balanced and keyed to the fan shaft. Enclose and isolate fan bearings and drive shafts from the air stream. Fan bearings shall be sealed against dust and dirt, shall be permanently lubricated or with accessible grease fittings, and shall be precision self-aligning ball or roller type. Bearing life shall be L50 rated at not less than 200,000 hours of operation as defined by ABMA 9 and ABMA 11. Provide fan inlets with an aerodynamically shaped bell and an inlet cone. Install diffuser or straightening vanes at the fan discharge to minimize turbulence and provide smooth discharge air flow. Unless otherwise indicated, motors shall not exceed 1800 rpm. Motor starters shall be as indicated. Motor and starters shall have enclosures suitable to their environment.

2.7.1.2 Panel Type Power Wall Ventilators

a. Fans shall be propeller type, assembled on a reinforced metal panel with venturi opening spun into panel. Fans with wheels less than 24 inches in diameter shall be direct or V-belt driven and fans with wheels 24 inches diameter and larger shall be V-belt drive type. Provide fans with wall mounting collar. Lubricated bearings shall be provided. Equip fans with wheel and motor side metal or wire guards which have a corrosion-resistant finish. Install gravity or motor operated backdraft dampers where indicated. Motor and starters shall have enclosures suitable to their environment.

2.7.1.3 Centrifugal Type Power Roof Ventilators

a. Fans shall be direct or V-belt driven centrifugal type with backward inclined, non-overloading wheel. Motor compartment housing shall be hinged or removable and weatherproof, constructed of heavy gauge aluminum. Provide fans with birdscreen, disconnect switch, gravity motorized dampers, roof curb, and extended base. Motor and starters shall have enclosures suitable to their environment. Kitchen exhaust fans shall be centrifugal type according to UL 705 and fitted with V-belt drive, round hood, and windband upblast discharge configuration, integral residue trough and collection device, motor and power transmission components located in outside positively air ventilated compartment. Use only lubricated bearings.

2.8 FACTORY PAINTING

2.8.1 Units which are not of galvanized construction according to ASTM A 123 or ASTM A 924 shall be factory painted with a corrosion resisting paint finish. Internal and external ferrous metal surfaces shall be cleaned, phosphatized and coated with a paint finish which has been tested according to ASTM B 117, ASTM D 1654, and ASTM D 3359. Evidence of satisfactory paint performance for a minimum of 125 hours for units to be installed indoors and 500 hours for units to be installed outdoors shall be submitted. Rating of failure at the scribe mark shall be not less than 6, average creepage not greater than 1/8 inch. Rating of the inscribed area shall not be less than 10, no failure. On units constructed of galvanized steel that have been welded, exterior surfaces of welds or welds that have burned through from the interior shall receive a final shop docket of zinc-rich protective paint according to ASTM D 520 Type I.

2.9 FIELD PAINTING

2.9.1 Clean, pretreat, prime and paint metal surfaces; except aluminum surfaces need not be painted. Apply coatings to clean dry surfaces. Clean the surfaces to remove dust, dirt, rust, oil and grease by wire brushing and solvent degreasing prior to application of paint, except metal surfaces subject to temperatures in excess of 120 degrees F shall be cleaned to bare metal. Where more than one coat of paint is specified, apply the second coat after the preceding coat is thoroughly dry. Lightly sand damaged painting and retouch before applying the succeeding coat. Color of finish coat shall be aluminum or light gray.

2.9.1.1 Temperatures less than 120 degrees F: Immediately after cleaning, the metal surfaces subject to temperatures less than 120 degrees F shall receive one coat of pretreatment primer applied to a minimum dry film thickness of 0.3 mil, one coat of primer applied to a minimum dry film thickness of one mil; and two coats of enamel applied to a minimum dry film thickness of one mil per coat.

2.9.1.2 Temperatures between 120 and 400 degrees F: Metal surfaces subject to temperatures between 120 and 400 degrees F shall receive two coats of 400 degrees F heat-resisting enamel applied to a total minimum thickness of two mils.

2.9.1.3 Temperatures greater than 400 degrees F: Metal surfaces subject to temperatures greater than 400 degrees F shall receive two coats of 600 degrees F heat-resisting paint applied to a total minimum dry film thickness of two mils.

2.10 SUPPLEMENTAL COMPONENTS/SERVICES

2.10.1 Insulation

2.10.1.1 The requirements for shop and field applied insulation are specified in Section 23 07 00 Thermal Insulation for Mechanical Systems.

2.10.1.2 PROGRAMMABLE COMMERCIAL THERMOSTAT

2.10.1.3 The contractor shall furnish, install, and place in operating condition an HVAC control system described herein. All units shall be located in accordance with the plans.

2.10.1.4 System Requirements:

2.10.1.5 Control up to three heating and three cooling stages for gas heat, electric heat, heat pump or compressor cooling.

2.10.1.6 Permit 365-day programming with schedule copy.

2.10.1.7 Provide 365-day clock with automatic daylight savings changeover and up to 10 holidays.

2.10.1.8 Provide 48-hour clock backup.

2.10.1.9 Provide two occupied and two unoccupied periods per day.

2.10.1.10 Offer automatic heat/cool changeover with 2° F (1° C) minimum deadband.

2.10.1.11 Provide override capability for a 1 to 8 hour configurable period, with 3-hour default.

2.10.1.12 Include a comfort adjust feature to modify setpoints for the override duration.

2.10.1.13 Provide configurable Proportional plus Integral plus Derivative (P + I + D) temperature control.

2.10.1.14 Display room temperature in °F or °C.

2.10.1.15 Provide three levels of keypad lockout - none, overrides only and complete.

2.10.1.16 Provide Temporary Not Occupied Override, 1-99 days.

2.10.1.17 Provide keypad method for saving and restoring both user and factory default settings.

2.10.1.18 Provide five methods for dehumidification (minimum ON time, reheat, reset temp setpoint, hot gas bypass and simple dehumidification).

2.10.1.19 Provide separate configurable recovery ramps for heating and cooling.

2.10.1.20 Provide separate configurable cycle rates for heating and cooling response.

2.10.1.21 System Components:

2.10.1.22 365 day programmable thermostat with subbase.

2.10.1.23 Wall mount temperature and integral humidity sensors.

2.10.1.24 Codes and Standards: The system shall comply with applicable provisions of ASHRAE 90-75.

2.10.1.25 Wiring: All wiring shall meet National Electrical Codes and local electrical codes. The contractor is responsible for assuring that conduit and wire quantity, size, and type are suitable for the equipment supplied.

2.10.1.26 Testing and Warranty: Upon completion, the contractor shall conduct a total system test of the operation of the thermostat. All components, parts, and assemblies supplied by the manufacturer shall be guaranteed against defects in materials and workmanship for 12 months. Warranty service shall be performed by the contractor.

2.10.1.27 Manufacturer: Honeywell T7350 with PDA configuration software or Honeywell T7351 with keypad configuration.

2.10.1.28 Sequence of Operation

2.10.1.29 The heating and cooling setpoints shall be individually adjustable for both the occupied, unoccupied and standby periods. The thermostat shall have a minimum deadband of 2° F (1° C) (no mechanical heating or cooling shall operate within this deadband). Space temperature deviation above the cooling setpoint or below the heating setpoint shall generate a demand signal to control the system as follows:

2.10.1.30 Heating: The thermostat shall control the heating output based on the demand signal communicated from the thermostat program, taking into account both space temperature deviation (proportional gain), the duration of that temperature deviation (integral gain), and the rate of change of the deviation (derivative gain). The thermostat shall energize heating equipment when space temperature falls below heating setpoint.

2.10.1.31 Cooling: The thermostat shall control the cooling output based on the demand signal communicated from the thermostat program, taking into account both space temperature deviation (proportional gain), the duration of that temperature deviation (integral gain), and the rate of change of the deviation (derivative gain). The thermostat shall energize cooling equipment when space temperature exceeds cooling setpoint.

2.10.1.32 Dehumidification: The thermostat shall provide five methods for dehumidification:

2.10.1.33 Minimum On - Increasing the compressor minimum on time.

2.10.1.34 Reset - lower the cooling setpoint.

2.10.1.35 Reheat - cooling and simultaneous reheat.

2.10.1.36 Auxiliary output - to external dehumidifier.

2.10.1.37 Hot gas bypass - auxiliary output operates depending on humidity level and number of active cooling stages.

2.10.1.38 Heating Setback and Cooling Setup: Initiation of heating setback or cooling setup for each of 365 days shall be provided by a programmed time schedule manually entered into the thermostat. When all or a portion of a manually programmed schedule is unavailable, the thermostat shall control to a default program.

2.10.1.39 Setpoint Recovery from Not Occupied to Occupied: The thermostat shall incorporate a ramping feature that gradually changes the space setpoints. During recovery operation, the setpoint changes at a rate in degrees per hour depending on the minimum ramp rate.

2.10.1.40 Fan Operation: Fan operation shall be selectable as follows:

2.10.1.41 On: Fan operates continuously in occupied mode, and during standby modes, and during a call for heat or cool.

2.10.1.42 Auto: Fan is energized with calls for heating and cooling.

2.10.1.43 Minimum Stage Operation Time:

2.10.1.44 Minimum On: Heat - 1 minute; Cool - 3 minutes.

2.10.1.45 Minimum Off: Cool & Heat Pump - 1 minute.

2.10.1.46 Power Interruption:

2.10.1.47 On loss of power, the thermostat shall maintain programmed times and temperatures for 10 years.

2.10.1.48 Clock and day information shall be retained for a minimum of 48 hours.

2.10.1.49 Overrides:

2.10.1.50 The Temporary Occupied Override can be used when the thermostat is in Not Occupied or Standby mode. It shall switch to the Occupied mode for an installer-configured number of hours. The default shall be three hours.

2.10.1.51 The Temporary Not Occupied Override shall fix the schedule to operate in Not Occupied mode for a number of days (between 1 and 99) without changing programming saved in memory.

2.10.1.52 Pressing “Run Schedule” shall cancel the overrides and return to the program.

PART 3 EXECUTION

3.1 INSTALLATION

Installation shall be as shown and according to the manufacturer's diagrams, recommendations and manufacturer's installation instructions.

3.1.1 Equipment and Installation

3.1.1.1 Provide frames and supports for tanks, compressors, pumps, valves, air handling units, fans, coils, dampers, and other similar items requiring supports. Floor mount or ceiling hang air handling units as indicated. The method of anchoring and fastening shall be as detailed. Set floor-mounted equipment on not less than 6 inch concrete pads or curbs doweled in place unless otherwise indicated. Concrete foundations for circulating pumps shall be heavy enough to minimize the intensity of the vibrations transmitted to the piping and the surrounding structure, as recommended in writing by the pump manufacturer. In lieu of a concrete pad foundation, a concrete pedestal block with isolators placed between the pedestal block and the floor may be provided. The concrete foundation or concrete pedestal block shall be of a mass not less than three times the weight of the components to be supported. Lines connected to the pump mounted on pedestal blocks shall be provided with flexible connectors. Furnish foundation drawings, bolt-setting information, and foundation bolts prior to concrete foundation construction for all equipment indicated or required to have concrete foundations. Concrete for foundations shall be as specified in Section 03 30 00 Cast-In-Place Concrete.

3.1.2 Access Panels

3.1.2.1 Install access panels for concealed valves, vents, controls, dampers, and items requiring inspection or maintenance. Access panels shall be of sufficient size and located so that the concealed items may be serviced and maintained or completely removed and replaced.

3.1.3 Flexible Duct

3.1.3.1 Install pre-insulated flexible duct in accordance with the latest printed instructions of the manufacturer to ensure a vapor tight joint. Hangers, when required to suspend the duct, shall be of the type recommended by the duct manufacturer and shall be provided at the intervals recommended.

3.1.4 Metal Ductwork

Installation shall be according to SMACNA HVAC Duct Const Stds unless otherwise indicated. Duct supports for sheet metal ductwork shall be according to SMACNA HVAC Duct Const Stds, unless otherwise specified. Friction beam clamps indicated in SMACNA HVAC Duct Const Stds shall not be used. Risers on high velocity ducts shall be anchored in the center of the vertical run to allow ends of riser to move due to thermal expansion. Supports on the risers shall allow free vertical movement of the duct. Supports shall be attached only to structural framing members and concrete slabs. Supports shall not be anchored to metal decking unless a means is provided and approved for preventing the anchor from puncturing the metal decking. Where supports are required between structural framing members, suitable intermediate metal framing shall be provided. Where C-clamps are used, retainer clips shall be provided.

3.1.4.1 Exposed Ductwork

a. Exposed ductwork shall be fabricated from minimum 18 gauge, Type 304L or 316L, stainless steel with continuously welded joints and seams. Ducts shall be pitched to drain at hoods and low points indicated. Surface finish shall match hoods.

3.1.5 Acoustical Duct Lining

3.1.5.1 Lining shall be applied in cut-to-size pieces attached to the interior of the duct with nonflammable fire resistant adhesive conforming to ASTM C 916, Type I, NFPA 90A, UL 723, and ASTM E 84. Top and bottom pieces shall lap the side pieces and shall be secured with welded pins, adhered clips of metal, nylon, or high impact plastic, and speed washers or welding cup-head pins installed according to SMACNA HVAC Duct Const Stds. Welded pins, cup-head pins, or adhered clips shall not distort the duct, burn through, nor mar the finish or the surface of the duct. Pins and washers shall be flush with the surfaces of the duct liner and all breaks and punctures of the duct liner coating shall be sealed with the nonflammable, fire resistant adhesive. Exposed edges of the liner at the duct ends and at other joints where the lining will be subject to erosion shall be coated with a heavy brush coat of the nonflammable, fire resistant adhesive, to prevent delamination of glass fibers. Duct liner may be applied to flat sheet metal prior to forming duct through the sheet metal brake. Lining at the top and bottom surfaces of the duct shall be additionally secured by welded pins or adhered clips as specified for cut-to-size pieces. Other methods indicated in SMACNA HVAC Duct Const Stds to obtain proper installation of duct liners in sheet metal ducts, including adhesives and fasteners, will be acceptable.

3.1.6 Dust Control

3.1.6.1 To prevent the accumulation of dust, debris and foreign material during construction, temporary dust control protection shall be provided. The distribution system (supply and return) shall be protected with temporary seal-offs at all inlets and outlets at the end of each day's work. Temporary protection shall remain in place until system is ready for startup.

3.1.7 Insulation

3.1.7.1 Thickness and application of insulation materials for ductwork, piping, and equipment shall be according to Section 23 07 00 Thermal Insulation for Mechanical Systems. Outdoor air intake ducts and plenums shall be externally insulated up to the point where the outdoor air reaches the conditioning unit or up to the point where the outdoor air mixes with the outside air stream.

3.1.8 Duct Test Holes

3.1.8.1 Holes with closures or threaded holes with plugs shall be provided in ducts and plenums as indicated or where necessary for the use of pitot tube in balancing the air system. Extensions, complete with cap or plug, shall be provided where the ducts are insulated.

3.1.9 Power Roof Ventilator Mounting

3.1.9.1 Foamed 1/2 inch thick, closed-cell, flexible elastomer insulation shall cover width of roof curb mounting flange. Where wood nailers are used, holes shall be pre-drilled for fasteners.

3.1.10 Power Transmission Components Adjustment

3.1.10.1 V-belts and sheaves shall be tested for proper alignment and tension prior to operation and after 72 hours of operation at final speed. Belts on drive side shall be uniformly loaded, not bouncing. Alignment of direct driven couplings shall be to within 50 percent of manufacturer's maximum allowable range of misalignment.

3.2 PENETRATIONS

3.2.1 Provide sleeves and prepared openings for duct mains, branches, and other penetrating items, and install during the construction of the surface to be penetrated. Cut sleeves flush with each surface. Provide sleeves for round duct 15 inches and smaller. Provide framed prepared openings for round duct larger than 15 inches and square, rectangular or oval ducts. Sleeves and framed openings are also required where grilles, registers, and diffusers are installed at the openings. Provide one inch clearance between penetrating and penetrated surfaces except at grilles, registers, and diffusers. Pack spaces between sleeve or opening and duct or duct insulation with mineral fiber conforming with ASTM C 553, Type 1, Class B-2.

a. Sleeves: Fabricate sleeves, except as otherwise specified or indicated, from 20 gauge thick mill galvanized sheet metal. Where sleeves are installed in bearing walls or partitions, provide black steel pipe conforming with ASTM A 53, Schedule 20.

b. Framed Prepared Openings: Fabricate framed prepared openings from 20 gauge galvanized steel, unless otherwise indicated.

c. Insulation: Provide duct insulation in accordance with Section 23 07 00 Thermal Insulation for Mechanical Systems continuous through sleeves and prepared openings except firewall penetrations. Terminate duct insulation at fire dampers and flexible connections. For duct handling air at or below 60 degrees F, provide insulation continuous over the damper collar and retaining angle of fire dampers, which are exposed to unconditioned air.

d. Closure Collars: Provide closure collars of a minimum 4 inches wide, unless otherwise indicated, for exposed ducts and items on each side of penetrated surface, except where equipment is installed. Install collar tight against the surface and fit snugly around the duct or insulation. Grind sharp edges smooth to prevent damage to penetrating surface. Fabricate collars for round ducts 15 inches in diameter or less from 20 gauge galvanized steel. Fabricate collars for square and rectangular ducts, or round ducts with minimum dimension over 15 inches from 18 gauge galvanized steel. Fabricate collars for square and rectangular ducts with a maximum side of 15 inches or less from 20 gauge galvanized steel. Install collars with fasteners a maximum of 6 inches on center. Attach to collars a minimum of 4 fasteners where the opening is 12 inches in diameter or less, and a minimum of 8 fasteners where the opening is 20 inches in diameter or less.

e. Firestopping: Where ducts pass through fire-rated walls, fire partitions, and fire rated chase walls, seal the penetration with fire stopping materials as specified in Section 07 84 00 Firestopping.

3.3 FIELD PAINTING AND IDENTIFICATION SYSTEMS

3.3.1 Identification Tags

3.3.1.1 Provide identification tags made of brass, engraved laminated plastic, or engraved anodized aluminum, indicating service and item number on all valves and dampers. Tags shall be 1-3/8 inch minimum diameter and marking shall be stamped or engraved. Indentations shall be black for reading clarity. Tags shall be attached to valves with No. 12 AWG, copper wire, chrome-plated beaded chain or plastic straps designed for that purpose.

3.3.2 Finish Painting

3.3.2.1 The requirements for finish painting of items only primed at the factory, and surfaces not specifically noted otherwise, are specified in Section 09 90 00 Paints and Coatings.

3.3.3 Color Coding Scheme for Locating Hidden Utility Components

3.3.3.1 Use scheme in buildings having suspended grid ceilings. The color coding scheme shall identify points of access for maintenance and operation of components and equipment that are not visible from the finished space and are accessible from the ceiling grid. The color coding scheme shall consist of a color code board and colored metal disks. Each colored metal disk shall be approximately 3/8 inch diameter and secured to removable ceiling panels with fasteners. Insert each fastener into the ceiling panel so as to be concealed from view. The fasteners shall be manually removable without the use of tools and shall not separate from the ceiling panels when the panels are dropped from ceiling height. Installation of colored metal disks shall follow completion of the finished surface on which the disks are to be fastened. The color code board shall be approximately 3 foot wide, 30 inches high, and 1/2 inches thick. The board shall be made of wood fiberboard and framed under glass or 1/16 inch transparent plastic cover. The color code symbols shall be approximately 3/4 inch in diameter and the related lettering in 1/2 inch high capital letters. Mount the color code board where indicated in the mechanical or equipment room. The color code system shall be as indicated.

3.4 DAMPER ACCEPTANCE TEST

3.4.1 Operate all fire dampers and smoke dampers under normal operating conditions, prior to the occupancy of a building to determine that they function properly.