VA 23 82 00-2011 CONVECTION HEATING AND COOLING UNITS.pdf

1、04-11 23 82 00 - 1 SECTION 23 82 00 CONVECTION HEATING AND COOLING 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 paragraph. 2. References to pressure in this section are gage pressure

2、 unless otherwise noted. PART 1 - GENERAL 1.1 DESCRIPTION SPEC WRITER NOTE: Edit each of the following paragraphs as necessary to agree with products being used. Induction units, fan-coil units, radiant ceiling panels (for bathrooms), unit heaters, cabinet unit heaters, convectors and finned-tube ra

3、diation 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, which are common to more than one section of Division 23. C. Sec

4、tion 23 05 41, NOISE and VIBRATION CONTROL FOR HVAC PIPING and EQUIPMENT: Noise requirements. D. Section 23 21 13, HYDRONIC PIPING: Heating hot water and chilled water piping. E. Section 23 31 00, HVAC DUCTS and CASINGS: Ducts and flexible connectors. F. Section 23 09 23, DIRECT-DIGITAL CONTROL SYST

5、EM FOR HVAC: Valve operators. G. Section 23 05 93, TESTING, ADJUSTING, and BALANCING FOR HVAC: Flow rates adjusting and balancing. H. Section 23 82 16, AIR COILS: Additional coil requirements. I. Section 23 08 00 COMMISSIONING OF HVAC SYSTEMS: Requirements for commissioning, systems readiness checkl

6、ists, and training. J. Section 01 09 00 GENERAL COMMISSIONING REQUIREMENTS Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-04-11 23 82 00 - 2 1.3 QUALITY ASSURANCE Refer to Paragraph, QUALITY ASSURANCE, in Section 23 05 11, COMMON WORK RESULTS FOR HV

7、AC. 1.4 SUBMITTALS A. Submit in accordance with Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, and SAMPLES. B. Manufacturers Literature and Data: 1. Induction units. 2. Fan-Coil units. 3. Unit heaters. 4. Cabinet unit heaters. 5. Convectors. 6. Finned-tube radiation. 7. Radiant ceiling panels. C. Ce

8、rtificates: 1. Compliance with paragraph, QUALITY ASSURANCE. 2. Compliance with specified standards. D. Operation and Maintenance Manuals: Submit in accordance with paragraph, INSTRUCTIONS, in Section 01 00 00, GENERAL REQUIREMENTS. E. Completed System Readiness Checklists provided by the Commission

9、ing 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. 1.5 APPLICABLE PUBLICATIONS A. The publications listed below form a part of this specification to th

10、e extent referenced. The publications are referenced in the text by the basic designation only. B. American National Standards Institute / Air Conditioning, Heating and Refrigeration Institute (ANSI/AHRI): 440-08 . Performance Rating of Room Fan Coils National Fire Protection Association (NFPA): 90A

11、-09 . Standard for the Installation of Air Conditioning and Ventilating Systems 70-11 National Electrical Code C. Underwriters Laboratories, Inc. (UL): 181-08 . Standard for Factory-Made Air Ducts and Air Connectors 1995-05 Heating and Cooling Equipment Provided by IHSNot for ResaleNo reproduction o

12、r networking permitted without license from IHS-,-,-04-11 23 82 00 - 3 1.6 GUARANTY In accordance with FAR clause 52.246-21 PART 2 - PRODUCTS 2.1 INDUCTION UNITS A. General: Induction units shall include an enclosure for cabinet models and casing for concealed models. Base unit shall include air ple

13、nums, air-discharge nozzles, air discharge grilles, recirculation grilles, water coil assembly, valve and piping package, condensate drain pan, and an adjustable air-balancing damper. Each unit shall be selected to produce the capacity shown on the drawings, without exceeding the specified static pr

14、essure. SPEC WRITER NOTE: Enclosure color to be selected and specified in consultation with the interior finish. B. Enclosure: Construct of galvanized steel minimum 1.3 mm (l8 gage), reinforced and braced. Front panel of enclosure shall be removable. Discharge grilles shall be adjustable and shall b

15、e of such design as to distribute air throughout the conditioned space. Plastic discharge and return grilles are not acceptable. Provide access doors for all piping and control compartments. Color of the enclosure shall be / /. C. Air Plenums: Construct air plenums of galvanized steel with interior

16、acoustically baffled and lined with sound absorbing materials that will attenuate the sound power from the primary air supply to the room. Lining shall be 13 mm (0.5 inch) thick (2.5 lb/ft3) density neoprene coates glass fiber. Heat-resistant nozzles shall be integral with or attached airtight to th

17、e plenum. Where coil induction units are supplied with vertical runouts, provide a streamlined, vaned, mitered elbow transition piece for connection between the unit and ductwork. Provide an adjustable air-balancing damper in each unit. DESIGNERS NOTE: See HVAC Design Manual Appendix 7-A Table 7-A1

18、for high humidity areas. D. Water Coils: Provide / single water coil. / dual water coils for heating and cooling. / Seamless copper tubing, with copper or aluminum fins, mechanically bonded or soldered to the tubes, suitable for 1378 kPa (200 psig) working pressure. Provide coil connections with no

19、less than 11 mm (7/16-inch) outside diameter flare or sweat connectors, accessory piping package with shut-off valves and terminal connections suitable for connection to the type of control valve supplied, and Provided by IHSNot for ResaleNo reproduction or networking permitted without license from

20、IHS-,-,-04-11 23 82 00 - 4 manual air vent. Test coils hydrostatically at 2067 kPa (300 psig) or under water at 1722 kPa (250 psig) air pressure. For all induction units in high humidity areas, provide factory-coated coils for protection from corrosion by using multiple stage electro-deposition coat

21、ing process. Refer to Drawings and Section 23 82 16, AIR COILS, for additional coil requirements. E. Provide easily accessible 25 mm (1 inch) thick throwaway type MERV 7 filters for each unit. F. Drain or Auxiliary Pans: Galvanized steel, watertight, and properly sized and located to collect all con

22、densed water dripping from any item within the unit enclosure. Provide drain connection when a condensate drain system is indicated. Connection shall be minimum 15 mm (l/2-inch) NPT. 2.2 ROOM FAN-COIL UNITS A. Capacity Certification: AHRI 440. B. Safety Compliance: NEC compliant and UL listed. C. No

23、ise Levels: Operating at full cooling capacity, sound power level shall not exceed by more than 5 dB the numerical value of sound pressure levels associated with noise criteria specified in Section 23 05 51, NOISE AND VIBRATION CONTROL FOR HVAC PIPING AND EQUIPMENT. Select units at intermediate spee

24、d, for compliance with the noise criteria. D. Chassis: Galvanized steel, acoustically and thermally insulated to attenuate noise and prevent condensation. E. Cabinet: Minimum 1.3 mm (l8 gage) steel reinforced and braced. Arrange components and provide adequate space for installation of piping packag

25、e and control valves. Finish shall be factory-baked enamel /in manufacturers standard color/color as selected by the architect/ on all exposed surfaces. l. Vertical Exposed Cabinet Unit: Provide 1.6 mm (l6 gage) steel front panel with 13 mm (l/2-inch) thick fiberglass insulation and provide screw-ty

26、pe levelers. /Provide low-silhouette type where shown./ a. Air outlet grilles: Adjustable four-way air deflection located in the top panel. b. Provide two hinged access doors (one each side) equipped with key operated cam-lock fasteners in the unit top panel located to provide access to the unit con

27、trols. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-04-11 23 82 00 - 5 2. Horizontal Unit: Provide /Recessed/Exposed/Concealed/ type as shown. Provide supports and vibration isolators for horizontal units as recommended by the manufacturer. a. Con

28、cealed Units: /Provide furred-in type with /return plenum and inlet duct collar and /outlet duct collar./ /Provide fully enclosed cabinet with inlet and outlet duct collars./ b. Recessed Units: Provide hinged access door with /stamped integral air inlet grille /and outlet grille/ inlet / and outlet

29、duct collar. c. Exposed Units: Fully enclosed cabinet with hinged bottom access panel with cam-lock fasteners. Provide stamped integral inlet and discharged grilles in front of cabinet. F. Fans: Centrifugal, forward curved, double width type wheels, galvanized steel or polyester resin construction,

30、statically and dynamically balanced, direct driven. l. Motors: Premium efficiency, 3-speed permanent split capacitor type with integral thermal overload protection, for operation at not more than l200 RPM. 2. Provide a fan speed selector switch, with off, low, medium, and high positions. Switch shal

31、l have a set of auxiliary contacts which are open when the switch is in the “off“ position and closed when the switch in any of the other positions. On vertical units, mount switch in a junction box in the cabinet of each unit. On ceiling-suspended horizontal and concealed units, switch shall be wal

32、l mounted. DESIGNERS NOTE: Most VA projects will include hydronic heating coils. Steam or Electric heating coils shall be included only where specifically required, and approved, for the particular project. G. Cooling and Heating Coils: 1. Hydronic (two separate coils for cooling and heating): Coppe

33、r tubes, 10 mm (three-eighths inch) minimum inside diameter, not less than 4.3 mm (0.0l7 inch) thick with copper or aluminum fins. Coils shall be pressure tested for bursting and strength in accordance with Underwriters Laboratories, Inc., requirements for pressure tested coils, and shall be designe

34、d to provide adequate heat transfer Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-04-11 23 82 00 - 6 capacity. Provide manual air vent at high point of each coil and drain at each low point. /2. Auxiliary steam coils: Serpentine copper tube mechani

35、cally bonded to aluminum fins, maximum working pressure 1378 kPa (200 psig). / /3. Electrical heating coils: Spiral sheath or finned-tube construction with Cal-rod resistance elements in aluminum tubes. Units shall be UL listed and factory wired with unit mounted heat switch, magnetic contactors, hi

36、gh temperature cutout safety control, and fan override thermostat. / H. Piping Package: Factory furnished with unit by the manufacturer or field-installed by the contractor to fit control valves provided by the controls supplier. Submit manufacturers detailed drawings of the piping in the end compar

37、tments for approval prior to fabrication of the piping packages. Provide ball stop valves on the supply and return pipes and balancing fittings on the return pipes. I. Drain pans: Furnish galvanized steel with solderless drain connections and molded polystyrene foam insulating liner: 1. Auxiliary dr

38、ain pan: Located under control valve and piping within the unit enclosure to prevent dripping. /2. Secondary Drain Pan: /Where shown on the drawings/Where the unit is located such that drain pan overflow will damage the building,/ provide a secondary drain pan located / underneath the unit, construc

39、ted to extend a minimum of 50 mm (2 inches) beyond the edges of the unit and be a minimum of 38 mm (1-1/2 inches deep) provided with a /separate drain line discharging to conspicuous point/ or /water detection device to deactivate the cooling in the unit/. J. Air Filter: Manufacturers standard throw

40、away type, not less than 25 mm (1 inch) thick, MERV 7, supported to be concealed from sight and be tight fitting to prevent air by-pass. Filters shall have slide out frames and be easily replaced without removing enclosure or any part thereof. K. Control valves and remote wall mounted space thermost

41、ats/ or unit mounted return air thermostats, where shown or specified /are to be field installed. Provide two-way modulating control valves unless shown or specified otherwise. 2.3 UNIT HEATERS A. General: Horizontal or vertical discharge type for steam, hot water or electric heating medium, as indi

42、cated. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-04-11 23 82 00 - 7 B. Casing: Steel sheet, phosphatized to resist rust and finished in baked enamel. Provide hanger supports. C. Fan: Propeller type, direct driven by manufacturers standard elect

43、ric motor. Provide resilient mounting. Provide fan guard for horizontal discharge units. D. Discharge Air Control: 1. Horizontal discharge: Horizontal, adjustable louvers. 2. Vertical discharge: Radial louver diffuser. DESIGNER NOTE Coil corrosion control is required for high-humidity locations. See

44、 VA HVAC Design Manual for locations. E. Steam or Hot Water Coil: Aluminum fins bonded to seamless copper tubing by mechanical expansion of the tubing, designed for 517 kPa (75 psig) steam working pressure. /1./ Corrosion Control: Provide corrosion control for coils in high-humidity locations by usi

45、ng a multi-stage, epoxy immersion coating (electrically deposited) process fully described in Section 23 82 16 Air Coils./ F. Electric Units: UL listed, factory wired to terminal strips for field connection of power and control wiring. 1. Heating elements: Nickel chromium alloy resistance wire embed

46、ded in a magnesium oxide insulating refractory and sealed in corrosion resisting metallic sheath with fins. Three phase heaters shall have balanced phases. 2. Thermal cutout: Manual reset type, which disconnects elements, and motor in the event normal operating temperatures are exceeded. 3. Magnetic

47、 contactor: Factory installed with low voltage relay for remote pilot duty thermostat operation. G. Controls: Provide field installed remote wall mounted line voltage electric space thermostats/ or unit mounted return air thermostats, where shown or specified / to control the unit fan. /Provide an a

48、quastat on /steam/hot water/ units to prevent fan operation when the heating system is off/. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-04-11 23 82 00 - 8 2.4 CABINET UNIT HEATERS A. General: Vertical or horizontal type for steam, hot water or e

49、lectric heating medium, as indicated. B. Cabinet: Not less than 1.3 mm (l8 gage) steel with front panel for vertical units and hinged front panel for horizontal units. Finish on exposed cabinet shall be factory-baked enamel in manufacturers standard color as selected by the Architect. Provide 76 mm (3-inch) high su