1、*USACE / NAVFAC / AFCESA / NASA UFGS-23 82 46.00 40 (August 2011)-Preparing Activity: NASA SupersedingUFGS-23 82 46.00 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 46.00 40ELECTRIC UNIT HEATERS08/11PART 1 GENERAL1.1 REFERENCES1.2 ADMINISTRATIVE REQUIREMENTS1.2.1 Pre-Installation Meetings1.3 SUBMITTALSPART 2 PRODUCTS2.1 PRODUCT STANDARDS2.2 DESCRIPTION2.3 CASINGS2.4 AIR DISTRIBUTION2.5 HEATING ELEMENT2.6 CONTROLS2.7 PROPELLERS AND MO
3、TORSPART 3 EXECUTION3.1 INSTALLATION3.2 FIELD TESTING- End of Section Table of Contents -SECTION 23 82 46.00 40 Page 1Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-*USACE / NAVFAC / AFCESA / NASA UFGS-23 82 46.00 40 (August 2011)-Preparing Activity
4、: NASA SupersedingUFGS-23 82 46.00 40 (February 2011)UNIFIED FACILITIES GUIDE SPECIFICATIONSReferences are in agreement with UMRL dated October 2011*SECTION 23 82 46.00 40ELECTRIC UNIT HEATERS08/11*NOTE: This guide specification covers the requirements for electric unit heaters. Indicate on drawings
5、 the capacity, voltage, rating, control-circuit voltage, cfm, sizes, mounting height, 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 guide
6、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, suggestions a
7、nd 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 text by
8、 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 Reference Wiza
9、rds Check Reference feature to update SECTION 23 82 46.00 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 you c
10、hoose 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) Electric
11、 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 MATERIAL
12、S 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 electric heaters indicating the
13、 of fabrication and assembly details to be performed in the factory.b. Submit Equipment and Performance Data for electric heaters life, test, system functional flows, safety features, and mechanical automated details.c. Submit Manufacturers Instructions for electric heaters stating the special provi
14、sions required to install equipment components and system packages. Detail impedances, hazards and safety precautions within the special notices.1.3 SUBMITTALS*NOTE: Review Submittal Description (SD) definitions in Section 01 33 00 SUBMITTAL PROCEDURES and edit the following list to reflect only the
15、 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 46.00 40 Page 3Provided by IHSNot for ResaleNo reproduction or networkin
16、g 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 context of t
17、he 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 Archite
18、ct-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 bracketed ite
19、m 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 designation fo
20、llowing 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, _SD-03 Product DataEquipment and Performance Data; G; G, _Electric Unit He
21、aters; G; G, _Heating Element; G; G, _Controls; G; G, _Casings; G; G, _Propellers and Motors; G; G, _SD-08 Manufacturers InstructionsManufacturers Instructions; G; G, _PART 2 PRODUCTS2.1 PRODUCT STANDARDSProvide products conforming to the requirements of UL 1996 for electric SECTION 23 82 46.00 40 P
22、age 4Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-unit heaters.2.2 DESCRIPTIONProvide suspended electric unit heaters and arrange for discharge of air as indicated.Provide electric unit heaters with not less than the indicated capacity and conform
23、 to requirements specified herein. Ensure electric unit heaters are factory prewired, ready for field terminal connections.2.3 CASINGSConstruct casings with smoothly contoured propeller orifice rings of not less than 1.0 millimeter 20-gage cold-rolled carbon steel. Provide casing surface finish with
24、 phosphate pretreatment, prime coating, and baked-enamel finish.2.4 AIR DISTRIBUTION Fit vertical discharge units with louver-cone diffusers.Provide horizontal units with adjustable single- or double-deflection louvers.2.5 HEATING ELEMENTConstruct heating element of a resistance wire insulated by hi
25、ghly compacted refractory insulation protected by a sealed metallic-finned sheath. Component materials are as follows:a. Provide resistance wire not less than 20-helix wound alloy approximately 80-percent nickel and 20-percent chromium.b. Provide refractory insulation of magnesium oxide with a resis
26、tance of not less than 50,000-ohms after exposure to an ambient temperature and humidity of 32 degrees C 90 degrees F and 85 plus or minus 5-percent relative humidity, respectively, for not less than 24 hours.c. Provide sheathing consisting of aluminum fins cast around an internal steel sheath conta
27、ining refractory insulation and resistance wire or carbon-steel fins permanently attached to a tubular carbon-steel sheath containing refractory insulation and resistance wire and with external surfaces porcelainized. Ensure maximum surface temperature of porcelain-protected steel sheathing is 370 _
28、 degrees C 700 _ degrees F.Ensure maximum surface temperature of cast-aluminum sheathing is 260 _ degrees C 500 _ degrees F.2.6 CONTROLS Fit units up to and including 5 kilowatts with integral controls including thermal overload cutout switches, necessary transformers, liquid-vapor system, and low-m
29、ass bimetal thermostat as required. Provide automatically resettable cutout switch.Provide unit with a remote unfused disconnect switch that opens ungrounded SECTION 23 82 46.00 40 Page 5Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-conductors in t
30、he OFF position and a thermostat with integral controls including thermal overload cutout switches, magnetic contactors, necessary transformers, and thermostat protection as required. Provide automatically resettable cutout switches. Provide wall-mounted thermostats complete with thermometer, mechan
31、ical high-limit stop, calibrated operator, and an adjustable heater to effect anticipation and to prevent override of space temperature with a range between 12 and 41 degrees C 55 and 105 degrees F and a differential not exceeding 1 degrees C 1.5 degrees F. Provide thermostat rated for operation at
32、24 volts, 60 hertz. Provide transformers, wiring, and devices necessary to meet this requirement. Finish cases in brushed or satin chrome.2.7 PROPELLERS AND MOTORSProvide propellers with mill-aluminized galvanized-steel all-aluminum blades statically and dynamically balanced to within 0.5 percent. P
33、rovide units with fan-inlet safety guards.AMCA certify propellers and motors for air performance and noise level.Protect motors against damage by the heating element and resilient mount.Conform to Section 26 60 13.00 40 LOW-VOLTAGE MOTORS for motors, except that load-matched and custom-designed moto
34、rs may be used and be so identified on the shop drawings. For motors not so identified conform to the requirements specified.Subfractional and fractional custom-designed or applied motors may deviate from the preceding motor requirements as follows:a. Shaded-pole motors rated less than 125 watt 1/6-
35、horsepower may be used for direct-drive service.b. Permanent split-capacitor, split-phase, and capacitor-start motors rated185 watt 1/4-horsepower and less may be used for direct-drive service.c. Split-phase and capacitor-start motors, rated 185 watt 1/4-horsepower and less, may be used for belt-dri
36、ve service.d. Motor bearings may be manufacturers standard prelubricated sleeve type except provide motor with antifriction thrust bearings, when specified. Ensure lubricant provisions are extended service type, requiring replenishment not more than twice per year of continuous operation.Provide mot
37、or identification plate per manufacturers standard.Provide motor speed and control per unit-heater manufacturers standard.PART 3 EXECUTION3.1 INSTALLATIONInstall unit heaters in accordance with the manufacturers instructions at the mounting heights indicated.SECTION 23 82 46.00 40 Page 6Provided by
38、IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.2 FIELD TESTINGDemonstrate in the presence of the Contracting Officer that the unit heaters operate satisfactorily.Cycle unit heaters five times, from start to operating thermal conditions to off, to verify adequacy of construction, system controls, and component performance.Conduct an operational test for a minimum of 6 hours.- End of Section -SECTION 23 82 46.00 40 Page 7Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
