1、*USACE / NAVFAC / AFCESA / NASA UFGS-23 82 43.00 40 (August 2011)-Preparing Activity: NASA SupersedingUFGS-23 82 43.00 40 (February 2011)UNIFIED FACILITIES GUIDE SPECIFICATIONSReferences are in agreement with UMRL dated October 2011*SECTION TABLE OF CONTENTSDIVISION 23 - HEATING, VENTILATING, AND AI
2、R CONDITIONINGSECTION 23 82 43.00 40ELECTRIC DUCT HEATERS08/11PART 1 GENERAL1.1 REFERENCES1.2 ADMINISTRATIVE REQUIREMENTS1.2.1 Pre-Installation Meetings1.3 SUBMITTALSPART 2 PRODUCTS2.1 SYSTEM DESCRIPTION2.1.1 Performance Requirements2.2 COMPONENTS2.2.1 Heating Elements And Enclosures2.2.2 ControlsPA
3、RT 3 EXECUTION3.1 INSTALLATION3.2 FIELD QUALITY CONTROL- End of Section Table of Contents -SECTION 23 82 43.00 40 Page 1Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-*USACE / NAVFAC / AFCESA / NASA UFGS-23 82 43.00 40 (August 2011)-Preparing Activi
4、ty: NASA SupersedingUFGS-23 82 43.00 40 (February 2011)UNIFIED FACILITIES GUIDE SPECIFICATIONSReferences are in agreement with UMRL dated October 2011*SECTION 23 82 43.00 40ELECTRIC DUCT HEATERS08/11*NOTE: This guide specification covers the requirements for electric duct heaters. Ensure that drawin
5、gs indicate capacity, voltage, rating, control-circuit voltage, heating stages, cfm, sizes, and other pertinent data.Adhere to UFC 1-300-02 Unified Facilities Guide Specifications (UFGS) Format Standard when editing this guide specification or preparing new project specification sections. Edit this
6、guide specification for project specific requirements by adding, deleting, or revising text. For bracketed items, choose applicable items(s) or insert appropriate information.Remove information and requirements not required in respective project, whether or not brackets are present.Comments, suggest
7、ions and recommended changes for this guide specification are welcome and should be submitted as a Criteria Change Request (CCR).*PART 1 GENERAL1.1 REFERENCES*NOTE: This paragraph is used to list the publications cited in the text of the guide specification. The publications are referred to in the t
8、ext by basic designation only and listed in this paragraph by organization, designation, date, and title.Use the Reference Wizards Check Reference feature when you add a RID outside of the Sections Reference Article to automatically place the reference in the Reference Article. Also use the Referenc
9、e Wizards Check Reference feature to update SECTION 23 82 43.00 40 Page 2Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-the issue dates.References not used in the text will automatically be deleted from this section of the project specification when
10、 you choose to reconcile references in the publish print process.*The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.UNDERWRITERS LABORATORIES (UL)UL 1996 (2009; Reprint Dec 2009) El
11、ectric Duct Heaters1.2 ADMINISTRATIVE REQUIREMENTS*NOTE: If Section 26 00 00.00 20 BASIC ELECTRICAL MATERIALS AND METHODS is not included in the project specification, applicable requirements therefrom should be inserted and the following paragraph deleted.*Section 26 00 00.00 20 BASIC ELECTRICAL MA
12、TERIALS AND METHODS applies to work specified in this section.1.2.1 Pre-Installation MeetingsThe Contracting Officer will schedule a pre-installation meeting within 30_ days of Contract Award. Provide the following for review and approval:a. Submit fabrication drawings for duct heaters consisting of
13、 fabrication and assembly details to be performed in the factory.b. Submit equipment and performance data for duct heaters including use life, system functional flows, safety features, and mechanical automated details.c. Submit manufacturers instructions for duct heaters including installation drawi
14、ngs showing any special provisions required to install equipment components and system packages. Clearly note impedances, hazards and safety precautions.1.3 SUBMITTALS*NOTE: Review Submittal Description (SD) definitions in Section 01 33 00 SUBMITTAL PROCEDURES and edit the following list to reflect
15、only the submittals required for the project. Submittals should be kept to the minimum required for adequate quality control.A “G” following a submittal item indicates that the submittal requires Government approval. Some SECTION 23 82 43.00 40 Page 3Provided by IHSNot for ResaleNo reproduction or n
16、etworking permitted without license from IHS-,-,-submittals are already marked with a “G”. Only delete an existing “G” if the submittal item is not complex and can be reviewed through the Contractors Quality Control system. Only add a “G” if the submittal is sufficiently important or complex in cont
17、ext of the project.For submittals requiring Government approval on Army projects, a code of up to three characters within the submittal tags may be used following the “G“ designation to indicate the approving authority. Codes for Army projects using the Resident Management System (RMS) are: “AE“ for
18、 Architect-Engineer; “DO“ for District Office (Engineering Division or other organization in the District Office); “AO“ for Area Office; “RO“ for Resident Office; and “PO“ for Project Office. Codes following the “G“ typically are not used for Navy, Air Force, and NASA projects.Choose the first brack
19、eted item for Navy, Air Force and NASA projects, or choose the second bracketed item for Army projects.*Government approval is required for submittals with a “G“ designation; submittals not having a “G“ designation are for Contractor Quality Control approval.for information only. When used, a design
20、ation following the “G“ designation identifies the office that will review the submittal for the Government. Submit the following in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:SD-02 Shop DrawingsFabrication Drawings; G; G, _Installation Drawings; G; G, _SD-03 Product DataEquipment and Per
21、formance Data; G; G, _Duct Heaters; G; G, _Heating Elements; G; G, _Enclosures; G; G, _Controls; G; G, _SD-08 Manufacturers InstructionsManufacturers Instructions; G; G, _PART 2 PRODUCTS2.1 SYSTEM DESCRIPTIONProvide duct heaters with the capacity indicated, plus or minus 5 percent. SECTION 23 82 43.
22、00 40 Page 4Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Ensure duct heaters are factory prewired, ready for field terminal connections. Base capacity on _ 16 degrees C 60 degrees F entering air and _30 degrees C 85-degree F discharge air at _8.5
23、cubic meter 300 cubic feet per minute.2.1.1 Performance RequirementsProvide duct heaters conforming to the requirements of UL 1996.2.2 COMPONENTS2.2.1 Heating Elements And EnclosuresInstall heating elements with a framework complete with terminal, and construct junction boxes of mill-aluminized or g
24、alvanized carbon steel. Provide with a magnetic contactor in a separate enclosure insulated from the duct at duct heater location or at a separate, remote location.Ensure all gasketing is 1.6 millimeter 1/16-inch thick non-asbestos woven-cloth tape, with flange depth suitable for duct insulation pro
25、vided. Insulate terminal junction box to prevent elevated temperatures. Provide sheathed heating-element consisting of a resistance wire insulated by highly compacted refractory insulation protected by a sealed metallic-finned sheath. Provide component materials as follows:a. Resistance wire - helix
26、-wound alloy approximately 80 percent nickel and 20 percent chromium.b. Refractory insulation - magnesium oxide. Subject element to a dielectric test of twice the element rated voltage plus 1,000 volts applied between terminal and sheath for a period of 1 minute.c. Sheathing - aluminum fins cast aro
27、und an internal steel sheath containing refractory insulation and resistance wire or carbon-steel fins permanently attached to a tubular carbon-steel or corrosion-resistant steel sheath containing refractory insulation and resistance wire and with all external surfaces porcelainized.d. Wattage densi
28、ty is not to exceed 90 watts per 25 linear millimeter linear inchof heated element length or not greater than 22 watts per 645 square millimeter square inch.*NOTE: Do not specify an open heating element when it will be exposed to salt air.* Provide open heating-element consisting of a helix-wound re
29、sistance wire alloy approximately 80 percent nickel and 20 percent chromium. Wattage density is not to exceed 50 watts per 25 linear millimeter linear inch of heated element. Ensure element support minimizes abrasion and sagging. Provide safety screens on both upstream and downstream sides of heater
30、 elements.Provide dummy elements or include other provisions similar to open area perforated screens if required to uniformly distribute airflow across SECTION 23 82 43.00 40 Page 5Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-heater face.2.2.2 Con
31、trolsProvide units with integral overheat cutouts for primary and secondary protection, with automatic-reset primary cutout of the disk type and suitable for 277-volt, 60-hertz service. Provide disk type manual-reset secondary cutouts wired in series with each circuit.Provide bulb type manual-reset
32、secondary cutouts which actuate integral magnetic backup contactors.Provide bulb type manual-reset secondary cutouts which de-energize each circuit directly. Provide indicating light(s) to show:a. Heater onb. Each circuit on Locally provide pilot switch to cut off heater through integral magnetic co
33、ntactors. For heater assemblies rated at 45 amperes and larger, provide the heater assembly subdivided and fused. Fuse each subdivided 45-ampere heater load section. In circuits of less than 45 amperes, fuse appropriate sections.Provide UL-approved magnetic contactors, (other than integral overheat-
34、cutout associated units), remotely located as indicated. Provide step controllers for sequencing heater loads of UL-approved components and include the following:a. Delay to prevent line surge when energizing loadsb. Individual fusing of each stepc. Intercomponent wiring to terminals for field conne
35、ction cabinetProvide single- two- three- stage type wall mounted thermostats.Provide thermostats complete with thermometer, mechanical high-limit stop, calibrated operator, and an adjustable heater to effect anticipation and to prevent override of space temperature. Ensure range is between 13 and 40
36、 degrees C 55 and 105 degrees F, with differential not to exceed 1 degrees C 1.5 degrees F, rated for operation at 24 volts, 60 hertz. Provide any necessary transformers, wiring, and devices to meet this requirement. Finish cases in brushed or satin chrome.*NOTE: Supplement the following paragraph i
37、f solid-state step controller is selected.* Provide control of power to unit by a UL-listed solid-state silicon-controlled rectifier (SCR) system such that voltage is continuously SECTION 23 82 43.00 40 Page 6Provided by IHSNot for ResaleNo reproduction or networking permitted without license from I
38、HS-,-,-impressed and varied in minute increments over a range of zero to rated voltage or to 105 percent of rated voltage maximum.PART 3 EXECUTION3.1 INSTALLATIONInstall duct heaters in accordance with the manufacturers instructions and locate duct heaters to permit access to the heater after instal
39、lation.3.2 FIELD QUALITY CONTROLDemonstrate that duct heaters operate satisfactorily in the presence of the Contracting Officer.Conduct an operational test for a minimum of 6 _ hours.Cycle duct heaters five times, from start to operating thermal conditions to off, to verify adequacy of construction, system controls, and component performance.- End of Section -SECTION 23 82 43.00 40 Page 7Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
