VA 23 73 00-2011 INDOOR CENTRAL-STATION AIR-HANDLING UNITS.pdf

1、04-11 23 73 00 - 1 SECTION 23 73 00 INDOOR 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 section are gage

2、 pressure unless otherwise noted. PART 1 - GENERAL 1.1 DESCRIPTION A. Air handling units including integral components specified herein. B. Definitions: Air Handling Unit (AHU): A factory fabricated and tested assembly of modular sections consisting of / housed-centrifugal fan with V-belt drive / /s

3、ingle or multiple plenum fans with direct-drive /, 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 air. Design capacities of units shall be as scheduled on the drawin

4、gs. 1.2 RELATED WORK /A. Seismic restraints for equipment: Section 13 05 41, SEISMIC RESTRAINT REQUIREMENTS FOR NON-STRUCTURAL COMPONENTS. / B. General mechanical requirements and items, which are common to more than one section of Division 23: Section 23 05 11, COMMON WORK RESULTS FOR HVAC AND STEA

5、M GENERATION. C. Sound and vibration requirements: Section 23 05 41, NOISE AND VIBRATION CONTROL FOR HVAC PIPING AND EQUIPMENT. D. Piping and duct insulation: Section 23 07 11, HVAC, PLUMBING, AND BOILER PLANT INSULATION. E. Piping and valves: Section 23 21 13 / 23 22 13, HYDRONIC PIPING / STEAM AND

6、 CONDENSATE HEATING PIPING. F. Heating and cooling coils and pressure requirements: Section 23 82 16, AIR COILS. G. Return and exhaust fans: Section 23 34 00, HVAC FANS. H. Requirements for flexible duct connectors, sound attenuators and sound absorbing duct lining, and air leakage: Section 23 31 00

7、, HVAC DUCTS and CASINGS. I. Air filters and filters efficiency: Section 23 40 00, HVAC AIR CLEANING DEVICES. J. HVAC controls: Section 23 09 23, DIRECT-DIGITAL CONTROL SYSTEM FOR HVAC. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-04-11 23 73 00 -

8、 2 K. Testing, adjusting and balancing of air and water flows: Section 23 05 93, TESTING, ADJUSTING, AND BALANCING FOR HVAC. L. Types of motors: Section 23 05 12, GENERAL MOTOR REQUIREMENTS FOR HVAC AND STEAM GENERATION EQUIPMENT. M. Types of motor starters: Section 26 29 11, LOW-VOLTAGE MOTOR START

9、ERS. N. General Commissioning: Section 01 91 00, GENERAL COMMISSIONING REQUIREMENTS O. HVAC Commissioning: Section 23 08 00, COMMISSIONING OF HVAC SYSTEMS 1.3 QUALITY ASSURANCE A. Refer to Article, Quality Assurance, in Section 23 05 11, COMMON WORK RESULTS FOR HVAC AND STEAM GENERATION. B. Air Hand

10、ling 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 single Plenum Fan shall be certified i

11、n 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 Standards: AHRI 430, AHRI 410, ASHRAE 51, a

12、nd 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. 2. The fan motor shall be selected within the rated nameplate capacity, without relying upon NEMA Standard Service Factor. 3. Select the fan operati

13、ng point as follows: a. Forward Curve and Axial Flow Fans: Right hand side of peak pressure point. b. Air Foil, Backward Inclined, or Tubular Fans 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 Manufac

14、turers Recommendations. E. Units shall be factory-fabricated, assembled, and tested by a manufacturer, in business of manufacturing similar air-handling units for at least five (5) years. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-04-11 23 73 00

15、 - 3 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 with or without heat recovery coils.

16、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 review and approval process. 1.4. SUBMITTAL

17、S: A. The contractor shall, in accordance with Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, AND SAMPLES, furnish a complete submission for all air handling units covered in the project. The submission shall include all information listed below. Partial and incomplete submissions shall be rejected

18、without reviews. B. Manufacturers Literature and Data: 1. Submittals for AHUs shall include fans, drives, motors, coils, / humidifiers, / sound attenuators /, mixing box with outside/return air dampers, filter housings, / blender sections /, and all other related accessories. The contractor shall pr

19、ovide 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, utility connection points, unit

20、 support system, vibration isolators, drain pan, pressure drops through each component (filter, coil etc). 2. Submittal drawings of section or component only will not be acceptable. Contractor shall also submit performance data including performance test results, charts, curves or certified computer

21、 selection data; data sheets; fabrication and insulation details. If the unit cannot 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. This data shall be submitted in hard copies

22、and in electronic version compatible to AutoCAD version used by the VA at the time of submission. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-04-11 23 73 00 - 4 3. Submit sound power levels in each octave band for the inlet and discharge of the f

23、an and at entrance and discharge of AHUs at scheduled conditions. In absence of sound power ratings refer to Section 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 f

24、or design point of operation and at maximum design Liters/Second (cubic feet per minute). 5. Submit total fan static pressure, external static pressure, for AHU including total, inlet and discharge pressures, and itemized specified internal losses and unspecified internal losses. Refer to air handli

25、ng unit schedule on drawings. C. Maintenance and operating manuals in 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 prio

26、r to factory testing. Submit written results of factory tests for approval prior to shipping. E. Submit 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 wrappin

27、g to protect the unit from dirt, moisture and/or road salt. 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 shipping splits shown

28、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 component shall b

29、e 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 cannot be shipped in

30、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. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-04-11 23 73 00 - 5 1.5 APPLICABLE PUBLICATION

31、S A. The publications listed below form a part of this specification to the extent referenced. The publications are referenced in the text by the basic designation only. B. Air-Conditioning, Heating, and Refrigeration Institute (AHRI)/(ARI): 410-01 . Standard for Forced-Circulation Air-Heating and A

32、ir-Cooling Coils 430-09 . Central Station Air Handling Units C. Air Movement and Control Association International, Inc. (AMCA): 210-07 . Laboratory Methods of Testing Fans for Rating D. American Society of Heating, Refrigerating and Air-conditioning Engineers, Inc. (ASHRAE): 170-2008 . Ventilation

33、of Health Care Facilities E. American Society for Testing and Materials (ASTM): ASTM B117-07a Standard Practice for Operating Salt Spray (Fog) Apparatus ASTM D1654-08 Standard Test Method for Evaluation of Painted or Coated Specimens Subjected to Corrosive Environments ASTM D1735-08 Standard Practic

34、e for Testing Water Resistance of Coatings Using Water Fog Apparatus ASTM D3359-08 Standard Test Methods for Measuring Adhesion by Tape Test F. Military Specifications (Mil. Spec.): MIL-P-21035B-2003 Paint, High Zinc Dust Content, Galvanizing Repair (Metric) G. National Fire Protection Association (

35、NFPA): NFPA 90A . Standard for Installation of Air Conditioning and Ventilating Systems, 2009 H. Energy Policy Act of 2005 (P.L.109-58) PART 2 - PRODUCTS 2.1 AIR HANDLING UNITS SPEC WRITER NOTES: 1. Use of the blow-through Air-handling Units, with cooling coils and after-filters located on the downs

36、tream side of the supply air fans, is not permitted. 2. Capacity of a single air-handling unit shall not exceed 23,600 Liters/Second (50,000 Cubic Feet per Minute - CFM) A. General: 1. AHUs shall be fabricated from insulated, solid double-wall galvanized steel without any perforations in draw-throug

37、h configuration. Casing Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-04-11 23 73 00 - 6 shall be fabricated as specified in section 2.1.C.2. Galvanizing shall be hot dipped conforming to ASTM A525 and shall provide a minimum of 0.275 kg of zinc pe

38、r square meter (0.90 oz. of zinc per square foot) (G90). Aluminum constructed units, subject to VA approval, may be used in place of galvanized steel. The unit manufacturer shall provide published documentation confirming that the structural rigidity of aluminum air-handling units is equal or greate

39、r than the specified galvanized steel. 2. The contractor and the AHU manufacturer shall be responsible for ensuring 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, pi

40、ping, wiring, and ductwork alterations of units, which are dimensionally different than those specified, shall be the responsibility of the contractor at no additional cost to the government. 3. AHUs shall be fully assembled by the manufacturer in the factory in accordance with the arrangement shown

41、 on the drawings. The unit shall be assembled into the largest sections possible subject to shipping 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

42、split to accommodate shipment and job site rigging. On units not shipped fully assembled, the manufacturer 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 fi

43、nal placement of unit. 4. The AHU manufacturer shall provide the necessary gasketing, caulking, and all screws, nuts, and bolts required for assembly. The manufacturer shall provide a factory-trained and qualified local representative at the job site to supervise the assembly and to assure that the

44、units are assembled to meet manufacturers recommendations and requirements noted on the drawings. Provide documentation to the Contracting Officer that the local representative has provided services of similar magnitude and complexity on jobs of comparable size. If a local representative cannot be p

45、rovided, the manufacturer shall provide a factory representative. 5. Gaskets: All door and casing and panel gaskets and gaskets between air handling unit components, if joined in the field, shall be high quality which seal air tight and retain their structural integrity and sealing capability after

46、repeated assembly and disassembly of Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-04-11 23 73 00 - 7 bolted panels and opening and closing of hinged components. Bolted sections may use a more permanent gasketing method provided they are not disass

47、embled. 6. Structural Rigidity: Provide structural reinforcement when required by span or loading so that the deflection of the assembled structure shall not exceed 1/200 of the span based on a differential static pressure of 1991 PA (8 inch WG) or higher. B. Base: 1. Provide a heavy duty steel base

48、 for supporting all major AHU components. Bases shall be constructed of wide-flange steel I-beams, channels, or minimum 125 mm (5 inch) high 3.5 mm (10 Gauge) steel base rails. Welded or bolted cross members shall be provided as required for lateral stability. Contractor shall provide supplemental s

49、teel supports as required to obtain proper operation heights for cooling coil condensate drain trap and / steam coil condensate return trap / as shown on drawings. 2. AHUs shall be completely self supporting for installation on concrete housekeeping pad, steel support pedestals, or suspended as shown on drawings. 3. The AHU bases not constructed of galvanized steel shall be cleaned, primed wi