1、04-11 23 74 13 - 1 SECTION 23 74 13 PACKAGED, OUTDOOR, CENTRAL-STATION AIR-HANDLING UNITS SPEC WRITER NOTES: 1. Delete between / - / if not applicable to project. Also delete any other item or paragraph not applicable in the section and renumber the paragraphs. 2. References to pressure in this sect
2、ion are gage pressure unless otherwise noted. 3. The spec writer shall review the Physical Security Design Manual for VA Facilities to determine and include any Mission Critical or Life Safety requirements called out. 4. For major new and renovation construction projects, outdoors (located on roof o
3、r grade) air-handling units are not permitted for the high-humidity locations, identified in Chapter 7. Outdoors air-handling units are also not permitted in the hurricane locations for the Mission Critical Facilities, identified in the Physical Security Manual. 5. For NRM (Non-Recurring Maintenance
4、) and minor construction projects, if outdoors air-handling units are permitted due to space constraints, the corrosion treatment specified below should be used for high-humidity locations. PART 1 - GENERAL 1.1 DESCRIPTION A. Roof top air handling units including integral components specified herein
5、. B. Definitions: Roof Top Air Handling Unit(Roof Top Units, RTU): A factory fabricated assembly consisting of fan, coils, filters, and other necessary equipment to perform one or more of the following functions of circulating, cleaning, heating, cooling, humidifying, dehumidifying, and mixing of ai
6、r. Design capacities of units shall be as scheduled on the drawings. 1.2 RELATED WORK /A. Section 13 05 41, SEISMIC RESTRAINT REQUIREMENTS FOR NON-STRUCTURAL COMPONENTS: Seismic restraints for equipment. / B. Section 23 05 11, COMMON WORK RESULTS FOR HVAC: General mechanical requirements and items,
7、which are common to more than one section of Division 23. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-04-11 23 74 13 - 2 C. Section 23 05 41, NOISE and VIBRATION CONTROL FOR HVAC PIPING and EQUIPMENT: Sound and vibration requirements. D. Section
8、23 07 11, HVAC and BOILER PLANT INSULATION: Piping and duct insulation. E. Section 23 21 13, HYDRONIC PIPING and Section 23 22 13, STEAM and CONDENSATE HEATING PIPING: Piping and valves. F. Section 23 82 16, AIR COILS: Heating and cooling coils and pressure requirements. G. Section 23 34 00, HVAC FA
9、NS: Return and exhaust fans. H. Section 23 31 00, HVAC DUCTS and CASINGS: Requirements for flexible duct connectors, sound attenuators and sound absorbing duct lining. I. Section 23 40 00, HVAC AIR CLEANING DEVICES: Air filters and filters efficiency. J. Section 23 09 23, DIRECT-DIGITAL CONTROL SYST
10、EM FOR HVAC: HVAC controls. K. Section 23 05 93, TESTING, ADJUSTING, and BALANCING FOR HVAC: Testing, adjusting and balancing of air and water flows. L. Section 23 05 12, GENERAL MOTOR REQUIREMENTS FOR HVAC and STEAM GENERATION EQUIPMENT: Types of motors. M. Section 26 29 11, LOW-VOLTAGE MOTOR START
11、ERS: Types of motor starters. N. Section 01 91 00, GENERAL COMMISSIONING REQUIREMENTS: O. Section 23 08 00 COMMISSIONING OF HVAC SYSTEMS: Requirements for commissioning, systems readiness checklists, and training. 1.3 QUALITY ASSURANCE A. Refer to Article, Quality Assurance, in Section 23 05 11, COM
12、MON WORK RESULTS FOR HVAC. B. Air Handling Units Certification 1. Air Handling Units with Housed Centrifugal Fans: The air handling units shall be certified in accordance with AHRI 430 and tested/rated in accordance with AHRI 260. 2. Air Handling Units with Plenum Fans: a. Air Handling Units with a
13、single Plenum Fan shall be certified in accordance with AHRI 430 and tested/rated in accordance with AHRI 260. b. Air handling Units with Multiple Fans in an Array shall be tested and rated in accordance with AHRI 430 and AHRI 260. C. Heating, Cooling, and Air Handling Capacity and Performance Stand
14、ards: AHRI 430, AHRI 410, ASHRAE 51, and AMCA 210. D. Performance Criteria: 1. The fan BHP shall include all system effects for all fans and v-belt drive losses for housed centrifugal fans. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-04-11 23 74
15、13 - 3 2. The fan motor shall be selected within the rated nameplate capacity, without relying upon NEMA Standard Service Factor. 3. Select the fan operating point as follows: a. Forward Curve and Axial Flow Fans: Right hand side of peak pressure point. b. Air Foil, Backward Inclined, or Tubular Fan
16、s Including Plenum Fans: At or near the peak static efficiency but at an appropriate distance from the stall line. 4. Operating Limits: AMCA 99 and Manufacturers Recommendations. E. Units shall be factory-fabricated, assembled, and tested by a manufacturer, in business of manufacturing similar air-h
17、andling units for at least five (5) years. SPEC WRITERS NOTES: For larger projects involving more than five air handling units, the A/E shall select a few typical AHUs, in different configurations, for an initial submission. The suggested different configurations are: 1. 100 percent outside air AHUs
18、 with or without heat recovery coils. 2. Re-circulating type of variable air volume AHUs with minimum outside air and economizer cycle features. The remaining submission shall be received only after the initial submission is approved with satisfactory resolution of all comments made during the revie
19、w and approval process. 1.4 SUBMITTALS: A. The contractor shall, in accordance with Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, and SAMPLES, furnish a complete submission for all roof top units covered in the project. The submission shall include all information listed below. Partial and incomple
20、te submissions shall be rejected without reviews. B. Manufacturers Literature and Data: 1. Submittals for RTUs shall include fans, drives, motors, coils, / humidifiers, / sound attenuators /, mixing box with outside/return air dampers, filter housings, / blender sections /, and all other related acc
21、essories. The contractor shall provide custom drawings showing total air handling unit assembly including dimensions, operating weight, access sections, / diffusion plates /, flexible connections, door swings, controls penetrations, electrical disconnect, lights, duplex receptacles, switches, wiring
22、, utility connection points, unit support system, vibration isolators, drain Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-04-11 23 74 13 - 4 pan, pressure drops through each component (filter, coil etc) and rigging points. 2. Submittal drawings of
23、 section or component only, will not be acceptable. Contractor shall also submit performance data including performance test results, charts, curves or certified computer selection data; data sheets; fabrication and insulation details; if the unit cannot be shipped in one piece, the contractor shall
24、 indicate the number of pieces that each unit will have to be broken into to meet shipping and job site rigging requirements. This data shall be submitted in hard copies and in electronic version compatible to AutoCAD version used by the VA at the time of submission. 3. Submit sound power levels in
25、each octave band for fan and at entrance and discharge of RTUs at scheduled conditions. Include sound attenuator capacities and itemized internal component attenuation. Internal lining of supply air ductwork with sound absorbing material is not permitted. In absence of sound power ratings refer to S
26、ection 23 05 41, NOISE AND VIBRATION CONTROL FOR HVAC PIPING AND EQUIPMENT. 4. Provide fan curves showing Liters/Second (cubic feet per minute), static pressure, efficiency, and horsepower for design point of operation and at maximum design Liters/Second (cubic feet per minute) and 110 percent of de
27、sign static pressure. 5. Submit total fan static pressure, external static pressure, for RTU including total, inlet and discharge pressures, and itemized specified internal losses and unspecified internal losses. Refer to air handling unit schedule on drawings. C. Maintenance and operating manuals i
28、n accordance with Section 01 00 00, GENERAL REQUIREMENTS. Include instructions for lubrication, filter replacement, motor and drive replacement, spare part lists, and wiring diagrams. D. Submit written test procedures two weeks prior to factory testing. Submit written results of factory tests for ap
29、proval prior to shipping. E. Completed System Readiness Checklists provided by the Commissioning Agent and completed by the contractor, signed by a qualified technician and dated on the date of completion, in accordance with the requirements of Section 23 08 00 COMMISSIONING OF HVAC SYSTEMS. F. Subm
30、it shipping information that clearly indicates how the units will be shipped in compliance with the descriptions below. 1. Units shall be shipped in one (1) piece where possible and in shrink wrapping to protect the unit from dirt, moisture and/or road salt. Provided by IHSNot for ResaleNo reproduct
31、ion or networking permitted without license from IHS-,-,-04-11 23 74 13 - 5 2. If not shipped in one (1) piece, provide manufacturer approved shipping splits where required for installation or to meet shipping and/or job site rigging requirements in modular sections. Indicate clearly that the shippi
32、ng splits shown in the submittals have been verified to accommodate the construction constraints for rigging as required to complete installation and removal of any section for replacement through available access without adversely affecting other sections. 3. If shipping splits are provided, each c
33、omponent shall be individually shrink wrapped to protect the unit and all necessary hardware (e.g. bolts, gaskets etc.) will be included to assemble unit on site (see section 2.1.A4). 4. Lifting lugs will be provided to facilitate rigging on shipping splits and joining of segments. If the unit canno
34、t be shipped in one piece, the contractor shall indicate the number of pieces that each unit will have to be broken into to meet shipping and job site rigging requirements. 1.5 APPLICABLE PUBLICATIONS A. The publications listed below form a part of this specification to the extent referenced. The pu
35、blications are referenced in the text by the basic designation only. B. Air-Conditioning, Heating, and Refrigeration Institute (AHRI): 260-01 . Sound Rating of Ducted Air Moving and Conditioning Equipment 410-01 . Standard for Forced-Circulation Air-Heating and Air-Cooling Coils 430-09 . Standard fo
36、r Central Station Air Handling Units AHRI-DCAACP Directory of Certified Applied Air Conditioning Products C. Air Moving and Conditioning Association (AMCA): 210-07 . Laboratory Methods of Testing Fans for Rating D. Anti-Friction Bearing Manufacturers Association, Inc. (AFBMA): 9-90 (R2008) . Load Ra
37、tings and Fatigue life for Ball Bearings E. American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE): 51-2007 Laboratory Methods of Testing Fans for Rating F. American Society for Testing and Materials (ASTM): A653/653M-02 . Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iro
38、n Alloy-Coated (Galvannealed) by the Hot-Dip Process B117-07a . Salt Spray (Fog) Testing Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-04-11 23 74 13 - 6 C1071-05e1 . Standard Specification for Fibrous Glass Duct Lining Insulation (Thermal and Soun
39、d Absorbing Material) D1654-08 . Standard Method for Evaluation of Painted or Coated Specimens Subjected to Corrosive Environments D1735-08 . Water Resistance of Coatings Using Water Fog Apparatus D3359-08 . Standard Test Methods for Measuring Adhesion by Tape Test E84-10 . Standard Test Method for
40、Surface Burning Characteristics of Building Materials G. Anti-Friction Bearing Manufacturers Association, Inc. (AFBMA): 9-90 . Load Ratings and Fatigue life for Ball Bearings H. Military Specifications (Mil. Spec.): DOD-P-21035A-2003 Paint, High Zinc Dust Content, Galvanizing Repair I. National Fire
41、 Protection Association (NFPA): NFPA 90A . Standard for Installation of Air Conditioning and Ventilating Systems, 2009 J. Energy Policy Act of 2005 (P.L.109-58) SPEC WRITER NOTES: 1. Use of the blow-through Air-handling Units, with cooling coils and after-filters located on the downstream side of th
42、e supply air fans, is 2. Capacity of a single air-handling unit shall not exceed 23,600 Liters/Second (50,000 Cubic Feet per Minute - CFM) PART 2 - PRODUCTS 2.1 ROOF TOP AIR HANDLING UNITS A. General: 1. Roof top units (RTU) shall be fabricated from insulated, solid double-wall galvanized steel with
43、out any perforations in draw-through configuration. Casing is specified in paragraph 2.1.C. Galvanizing shall be hot dipped conforming to ASTM A525 and shall provide a minimum of 0.275 kg of zinc per square meter (0.90 oz. of zinc per square foot) (G90). Aluminum constructed units may be provided su
44、bject to VA approval and documentation that structural rigidity is equal or greater than the galvanized steel specified. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-04-11 23 74 13 - 7 2. The contractor and the RTU manufacturer shall be responsibl
45、e for insuring that the unit will not exceed the allocated space shown on the drawings, including required clearances for service and future overhaul or removal of unit components. All structural, piping, wiring, and ductwork alterations of units, which are dimensionally different than those specifi
46、ed, shall be the responsibility of the contractor at no additional cost to the government. 3. RTUs shall be fully assembled by the manufacturer in the factory in accordance with the arrangement shown on the drawings. The unit shall be assembled into the largest sections possible subject to shipping
47、and rigging restrictions. The correct fit of all components and casing sections shall be verified in the factory for all units prior to shipment. All units shall be fully assembled, tested and then split to accommodate shipment and job site rigging. On units not shipped fully assembled, the manufact
48、urer shall tag each section and include air flow direction to facilitate assembly at the job site. Lifting lugs or shipping skids shall be provided for each section to allow for field rigging and final placement of unit. 4. The RTU manufacturer shall provide the necessary gasketing, caulking, and al
49、l screws, nuts, and bolts required for assembly. The manufacturer shall provide a local representative at the job site to supervise the assembly and to assure the units are assembled to meet manufacturers recommendations and requirements noted on the drawings. Provide documentation that this representative has provided this service on similar jobs to the Contracting Officer. If a lo
