1、04-03M15764-1SECTION 15764ROOF TOP AIR HANDLING UNITSSPEC WRITER NOTE:1. Delete between / - / if notapplicable to project. Also delete anyother item or paragraph not applicablein the section and renumber theparagraphs.2. References to pressure in this sectionare gage pressure unless otherwisenoted.3
2、. DESIGNER NOTE: Following is a list ofVA Standard Details. Coordinate workwith the applicable details.4. 15763.1 DWG, Air Handling UnitSchedule.5. 15763.2 DWG, Access Door Swing Detailfor Air Handling Units.6. 15673.3 DWG, Make-up Air Heating andVentilating Unit Schedule.PART 1 - GENERAL1.1 DESCRIP
3、TIONA. Roof top air handling units including integral components specifiedherein.B. Definitions: Roof Top Air Handling Unit(Roof Top Units, RTU): A factoryfabricated assembly consisting of fan, coils, filters, and othernecessary equipment to perform one or more of the following functions ofcirculati
4、ng, cleaning, heating, cooling, humidifying, dehumidifying, andmixing of air. Design capacities of units shall be as scheduled on thedrawings.1.2 RELATED WORK/A. Seismic restraints for equipment: Section 13081, SEISMIC RESTRAINTSREQUIREMENTS FOR NON-STRUCTURAL COMPONENTS. /B. General mechanical requ
5、irements and items, which are common to more thanone section of Division 15: Section 15050, BASIC METHODS ANDREQUIREMENTS (MECHANICAL).C. Sound and vibration requirements: Section 15200, NOISE AND VIBRATIONCONTROL.D. Piping and duct insulation: Section 15250, INSULATION.E. Piping and valves: Section
6、 15705, HVAC PIPING AND SYSTEMS.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-04-03M15764-2F. Heating and cooling coils and pressure requirements: Section 15750,HEATING AND COOLING COILS.G. Return and exhaust fans: Section 15822, FANS.H. Requiremen
7、ts for flexible duct connectors, sound attenuators and soundabsorbing duct lining: Section 15840, DUCTWORK AND ACCESSORIES.I. Air filters and filters efficiency: Section 15885, AIR FILTERS.J. HVAC controls: Section 15902, DDC CONTROLS AND INSTRUMENTATION.K. Testing, adjusting and balancing of air an
8、d water flows: Section 15980,TESTING ADJUSTING AND BALANCING.L. Types of motors: Section 16150, MOTORS.M. Types of motor starters: Section 16155, MOTOR STARTERS.1.3 QUALITY ASSURANCEA. Refer to Article, Quality Assurance, in Section 15050, BASIC METHODS ANDREQUIREMENTS (MECHANICAL).B. Certification:
9、 Certify roof top air-handling units in accordance withARI 430.C. Heating, Cooling, and Air Handling Capacity and Performance Standards:ARI 430, ARI 410, ASHRAE 51, and AMCA 210.D. Performance Criteria:1. The fan schedule indicates design cubic meter per minute (cubic feetper minute) and design stat
10、ic pressure. Scheduled fan motors, 375watts (1/2 horsepower) and larger, are sized for the maximum ofpresent or future design cubic meter per minute (cubic feet perminute) at 110 percent design static pressure, but not to exceed 187Pa (3/4 inch water gage) additional pressure.2. Fans and motors shal
11、l be capable of stable operation at designconditions cubic meters per minute (cubic feet per minute) and 110percent pressure as stated above.3. Lower than design pressure drop of approved individual components mayallow use of a smaller fan motor and still provide the safety factor.When submitted as
12、a deviation, a smaller motor may be approved in theinterest of energy conservation. Such a deviation shall not qualifyfor any value engineering incentive claim or reward.4. Select fan operating point to right hand side of peak static pressurepoint and near the peak of static efficiency.5. Operating
13、Limits: AMCA 99.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-04-03M15764-3E. Units shall be constructed by a manufacturer who has been manufacturingroof top units for at least five (5) years.F. Units shall be shipped in one (1) piece where possibl
14、e and in shrinkwrapping to protect the unit from dirt, moisture and /or road salt.Shipping splits can be provided as required for installation. Liftinglugs will be supplied on each side of the split to facilitate riggingand joining of segments.SPEC WRITERS NOTE: For larger projectsinvolving more tha
15、n five roof top units,the A/E shall select a few typical RTUs,in different configurations, for aninitial submission. The suggesteddifferent configurations are:1. 100 percent outside air RTUs with orwithout heat recovery coils.2. Recirculating type of variable airvolume RTUs with minimum outside aira
16、nd economizer cycle features. Theremaining submission shall be receivedonly after the initial submission isapproved with satisfactory resolutionof all comments made during the reviewand approval process.1.4. SUBMITTALS:A. The contractor shall, in accordance with Section 01340, SAMPLE AND SHOPDRAWING
17、S, furnish a complete submission for all roof top units coveredin the project. The submission shall include all information listedbelow. Partial and incomplete submissions shall be rejected withoutreviews.B. Manufacturers Literature and Data:1. Submittals for RTUs shall include fans, drives, motors,
18、 coils, /humidifiers, / sound attenuators /, mixing box with outside/returnair dampers, filter housings, and all other related accessories. Thecontractor shall provide custom drawings showing total air handlingunit assembly including dimensions, operating weight, accesssections, / diffusion plates /
19、, flexible connections, door swings,controls penetrations, electrical disconnect, lights, duplexreceptacles, switches, wiring, utility connection points, unitsupport system, vibration isolators, drain pan, pressure dropsthrough each component (filter, coil etc) and rigging points.Submittal drawings
20、of section or component only, will not beProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-04-03M15764-4acceptable. Contractor shall also submit performance data includingperformance test results, charts, curves or certified computerselection data; dat
21、a sheets; fabrication and insulation details; andthe number of pieces that each unit will have to be broken into tomeet shipping and job site rigging requirements. This data shall besubmitted in hard copies and in electronic version compatible toAutoCAD version used by the VA at the time of submissi
22、on.2. Submit sound power levels in each octave band for fan and at entranceand discharge of RTUs at scheduled conditions. Include soundattenuator capacities and itemized internal component attenuation.Internal lining of supply air ductwork with sound absorbing materialis not permitted. In absence of
23、 sound power ratings refer to Section15200, NOISE AND VIBRATION CONTROL.3. Provide fan curves showing cubic meters per minute (cubic feet perminute), static pressure, efficiency, and horsepower for design pointof operation and at maximum design cubic meters per minute (cubicfeet per minute) and 110
24、percent of design static pressure.4. Submit total fan static pressure, external static pressure, for RTUincluding total, inlet and discharge pressures, and itemizedspecified internal losses and unspecified internal losses. Refer toair handling unit schedule on drawings.C. Maintenance and operating m
25、anuals in accordance with Section 01010,GENERAL REQUIREMENTS. Include instructions for lubrication, filterreplacement, motor and drive replacement, spare part lists, and wiringdiagrams.D. Submit written test procedures two weeks prior to factory testing.Submit written results of factory tests for ap
26、proval prior to shipping.1.5 APPLICABLE PUBLICATIONSA. The publications listed below form a part of this specification to theextent referenced. The publications are referenced in the text by thebasic designation only.B. Air-Conditioning and Refrigeration Institute (ARI):260-01Sound Rating of Ducted
27、Air Moving andConditioning Equipment410-01Standard for Forced-Circulation Air-Heating andAir-Cooling CoilsProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-04-03M15764-5430-89Standard for Central Station Air Handling UnitsARI-DCAACPDirectory of Certifi
28、ed Applied Air ConditioningProductsC. Air Moving and Conditioning Association (AMCA):210-00Laboratory Methods of Testing Fans for RatingD. Anti-Friction Bearing Manufacturers Association, Inc. (AFBMA):9-90Load Ratings and Fatigue life for Ball BearingsE. American Society of Heating, Refrigerating an
29、d Air ConditioningEngineers (ASHRAE):51-01.Standard, Laboratory Methods of Testing Fans forRatingF. American Society for Testing and Materials (ASTM):A653/653M-02Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-DipProcessB117-97.Salt Spray (Fog) TestingC1071-
30、00Thermal and Acoustical Insulation (MineralFiber, Duct Lining Material)D1654-00Standard Method for Evaluation of Painted orCoated Specimens Subjected to CorrosiveEnvironmentsD1735-97Water Resistance of Coatings Using Water FogApparatusD3359-95Standard Test Methods for Measuring Adhesion byTape Test
31、E84-01Surface Burning Characteristics of BuildingMaterialsG. Anti-Friction Bearing Manufacturers Association, Inc. (AFBMA):9-90Load Ratings and Fatigue life for Ball BearingsH. Military Specifications (Mil. Spec.):DOD-P-21035A-77.Paint, High Zinc Dust Content, GalvanizingRepairI. National Fire Prote
32、ction Association (NFPA):90A-99Installation of Air Conditioning and VentilatingSystemsProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-04-03M15764-6PART 2 - PRODUCTS2.1 ROOF TOP AIR HANDLING UNITSA. General:1. Roof top units (RTU) shall be entirely of
33、 double wall galvanizedsteel construction. Casing is specified in paragraph 2.1.C. Foil facelining is not an acceptable substitute for double wall construction.Galvanizing shall be hot dipped conforming to ASTM A525 and shallprovide a minimum of 0.275 kg of zinc per square meter (0.90 oz. ofzinc per
34、 square foot) (G90). Aluminum constructed units may beprovided subject to VA approval and documentation that structuralrigidity is equal or greater than the galvanized steel specified.2. The contractor and the RTU manufacturer shall be responsible forinsuring that the unit will not exceed the alloca
35、ted space shown onthe drawings, including required clearances for service and futureoverhaul or removal of unit components. All structural, piping,wiring, and ductwork alterations of units, which are dimensionallydifferent than those specified, shall be the responsibility of thecontractor at no addi
36、tional cost to the government.3. RTUs shall be fully assembled by the manufacturer in the factory inaccordance with the arrangement shown on the drawings. The unit shallbe assembled into the largest sections possible subject to shippingand rigging restrictions. The correct fit of all components andc
37、asing sections shall be verified in the factory for all units priorto shipment. All units shall be fully assembled, tested and thensplit to accommodate shipment and job site rigging. On units notshipped fully assembled, the manufacturer shall tag each section andinclude air flow direction to facilit
38、ate assembly at the job site.Lifting lugs or shipping skids shall be provided for each section toallow for field rigging and final placement of unit.4. The RTU manufacturer shall provide the necessary gasketing, caulking,and all screws, nuts, and bolts required for assembly. Themanufacturer shall pr
39、ovide a local representative at the job site tosupervise the assembly and to assure the units are assembled to meetmanufacturers recommendations and requirements noted on thedrawings. Provide documentation that this representative has providedthis service on similar jobs to the Contracting Officer.
40、If a localProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-04-03M15764-7representative cannot be provided, the manufacturer shall provide afactory representative.5. Gaskets: All door and casing and panel gaskets and gaskets betweenair handling unit co
41、mponents, if joined in the field, shall be highquality which seal air tight and retain their structural integrityand sealing capability after repeated assembly and disassembly ofbolted panels and opening and closing of hinged components. Boltedsections may use a more permanent gasketing method provi
42、ded they arenot disassembled.6. Structural Rigidity: Provide structural reinforcement when requiredby span or loading so that the deflection of the assembled structureshall not exceed 1/200 of the span based on a differential staticpressure of 1991 Pa (8 inches water gage) or higher.SPEC WRITER NOTE
43、: Contractor need notsupply supplemental steel if drawings callfor additional structure to mount the unithigh to accommodate cooling coilcondensate trap.B. Base:1. Provide a heavy duty / steel base / 100-150 mm (4-6 inch) mountinglegs / for supporting all RTU major components. Bases shall beconstruc
44、ted of wide-flange steel I-beams, channels, or minimum 125 mm(5 inch) high 3.5 mm (10 gauge) steel base rails. Welded or boltedcross members shall be provided as required for lateral stability. /Contractor shall provide supplemental steel supports as required toobtain proper operation heights for co
45、oling coil condensate draintrap and / steam coil condensate return trap / as shown on drawings/.2. RTUs shall be completely self supporting for installation on / roofcurb or / steel support pedestals /.3. The RTU bases not constructed of galvanized material shall becleaned, primed with a rust inhibi
46、ting primer, and finished with rustinhibiting exterior enamel.C. Casing (including wall, floor and roof):1. General: RTU casing shall be entirely double wall insulated panels,integral of or attached to a structural frame. Construction shall besuch that removal of any panel shall not affect the struc
47、turalProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-04-03M15764-8integrity of the unit. Casing finished shall meet salt-spray test asspecified in paragraph 2.1.C.10. All casing and panel sections shallbe tightly butted and gasketed. No gaps of doubl
48、e wall constructionwill be allowed where panels bolt to air handling unit structuralmember. Structural members, not covered by the double wall panels,shall have equivalent insulated double wall construction.SPEC WRITER NOTE:1. Designer shall identify on drawingswhere perforated panels are required i
49、nthe RTU.2. Use 50 mm (2 inch) thick panels unlesssound analysis indicates that thickerpanels are required. If thicker panelsare used they shall be of perforatedpanel type except for RTUs servingsurgical suites.2. Double wall galvanized steel panels, minimum 51 mm (2 inches) thick,constructed of minimum 1.3 mm (18 gauge) outer skin and 1.0 mm (20gauge) solid or perforated inner skin. Perforated panels (inner skin)are not a
