1、 INCH-POUND MIL-PRF-24775A(SH) 31 January 2005 SUPERSEDING MIL-A-24775(SH) 13 July 1992 PERFORMANCE SPECIFICATION AIR CONDITIONING FAN COIL UNITS, HORIZONTAL AND VERTICAL TYPES, NAVAL SHIPBOARD This specification is approved for use by the Department of the Navy and is available for use by all Depar
2、tments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers horizontal and vertical type air conditioning fan-coil units for use in heating and air conditioning applications aboard Naval ships. 1.2 Classification. The air conditioning fan-coil units are of the fol
3、lowing classifications (see 6.2): 1.2.1 Types. The types of air conditioning fan units are as follows: Type H - Horizontal, overhead mounting Type V - Vertical, bulkhead mounting Type NMH - Nonmagnetic construction, horizontal, overhead mounting Type NMV - Nonmagnetic construction, vertical, bulkhea
4、d mounting 1.2.2 Sizes. The sizes of air conditioning fan units are as follows: Sizes 1-8 - Capacity in British thermal units per hour in thousands (MBH) as specified in Table I 1.2.3 Classes. The classes of air conditioning fan units are as follows: Heater kW - Heating in Kilowatt (kW) as specified
5、 in Table I Class RH - Right Hand - type DW chilled water coil Class LH - Left Hand - type DW chilled water coil 1.2.4 Grades. The grades of air conditioning fan units are as follows: HI Shock - HI shock unit Type X - Non-HI shock unit Comments, suggestions, or questions on this document should be a
6、ddressed to: Commander, Naval Sea Systems Command, ATTN: SEA 05Q, 1333 Isaac Hull Avenue, SE, Stop 5160, Washington Navy Yard DC 20376-5160 or emailed to commandstandardsnavsea.navy.mil, with the subject line “Document Comment”. Since contact information can change, you may want to verify the curren
7、cy of this address information using the ASSIST Online database at http:/assist.daps.dla.mil. AMSC N/A FSC 4120 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-24775A(SH) 1.2.5 Heater requirement. The heater requirements of air conditioning f
8、an units are as follows: Item A1 - Cooling unit with low voltage heater Item A2 - Cooling unit with medium voltage heater Item A3 - Cooling unit with high voltage heater 1.2.6 Motor protection. The motor protections of air conditioning fan units are as follows: Motor Protection LVP - Low voltage pro
9、tection Motor Protection LVR - Low voltage release 1.3 Part or identifying number (PIN). PINs to be used for horizontal and vertical type air conditioning fan-coil units acquired to this specification are created as follows: M 24775 - X X XX X X X Prefix for Military Specification Specification Numb
10、er Type (see code below) Size (see code below) Class (see code below) Grade (see code below) Heater requirement (see code below) Motor protection (see code below) Type Code Size Code Class Code Grade Code Heater Requirement Code Motor Protection Code Type Code Size Code Class Code Grade Code Heater
11、Code Motor protect. Code H A 1 1 RH RH HI shock 1 A1 A LVP 1 V B 2 2 LH LH Type X 2 A2 B LVR 2 NMH C 3 3 A3 C NMV D 4 4 5 5 6 6 7 7 8 8 Examples: M24775-A2RH1A2 M24775-B8LH2B1 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3, 4, or 5 of this speci
12、fication. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requireme
13、nts of documents cited in sections 3, 4, or 5 of this specification, whether or not they are listed. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-24775A(SH) 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The fo
14、llowing specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-S-901 - Shock Test, H.I. (High-Impact) Shi
15、pboard Machinery, Equipment, and Systems, Requirements for MIL-PRF-16552 - Filters, Air Environmental Control System, Cleanable, Impingement (High Velocity Type) MIL-B-17931 - Bearings, Ball, Annular, for Quiet Operation DEPARTMENT OF DEFENSE STANDARDS MIL-STD-167-1 - Mechanical Vibrations of Shipbo
16、ard Equipment (Type I - Environmental and Type II - Internally Excited) MIL-STD-889 - Dissimilar Metals MIL-STD-1399-300 - Interface Standard for Shipboard Systems, Electric Power, Alternating Current (Metric) MIL-STD-1474 - Noise Limits MIL-STD-2031 - Fire and Toxicity Test Methods and Qualificatio
17、n Procedure for Composite Material Systems Used in Hull, Machinery, and Structural Applications Inside Naval Submarines MIL-STD-2142 - Magnetic Silencing Characteristics, Measurement of (Metric) (Copies of these documents are available online at http:/assist.daps.dla.mil/quicksearch/ or http:/assist
18、.daps.dla.mil or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.2.2 Other Government documents, drawings, and publications. The following other Government documents, drawings, and publications form a part of this document to the extent
19、specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. NAVSEA TECHNICAL PUBLICATION S9074-AR-GIB-010/278 - Requirements for Fabrication, Welding and Inspection, Casting Inspection and Repair for Machinery, Piping and Pressure Vess
20、els (Copies of this document are available from Naval Inventory Control Point, 700 Robbins Avenue, Attn: Code 0862 (Cash Sales), Philadelphia, PA 19111 or online at www.nll.navsup.navy.mil.) 2.3 Non-Government publications. The following documents form a part of this document to the extent specified
21、 herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. AIR CONDITIONING AND REFRIGERATION INSTITUTE (ARI) ARI 410 - Forced-Circulation Air-Cooling and Air-Heating Coils (Copies of this document are available from the Air Conditioning and R
22、efrigeration Institute, 1501 Wilson Boulevard, Suite 600, Arlington, VA 22209-2403, Attn: Publications Department, or online at www.ari.org.) 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-24775A(SH) AIR MOVEMENT AND CONTROL ASSOCIATION, I
23、NC. (AMCA) AMCA 111 - Laboratory Accreditation Program (DoD adopted) AMCA 300 - Reverberant Room Method for Sound Testing of Fans (DoD adopted) (Copies of these documents are available from the Air Movement and Control Association, Inc., 30 West University Drive, Arlington Heights, IL 60004 or onlin
24、e at www.amca.org.) AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)/AMERICAN BEARING MANUFACTURERS ASSOCIATION (ABMA) ANSI/ABMA STD-4 - Tolerance Definitions and Gaging Practices for Ball and Roller Bearings ANSI/ABMA STD-9 - Load Ratings and Fatigue Life for Ball Bearings ANSI/ABMA STD-13 - Rolling Be
25、aring Vibration and Noise (Methods of Measuring) ANSI/ABMA STD-20 - Radial Bearings of Ball, Cylindrical Roller and Spherical Roller Types - Metric Design ANSI/ABMA/ISO 3290 - Rolling Bearings Balls Dimensions and Tolerances (DoD adopted) (Copies of these documents are available from the American Be
26、aring Manufacturers Association, Inc., 1101 Connecticut Ave., NW, Suite 700, Washington, DC 20036 or online at www.abma-dc.org.) AMERICAN SOCIETY OF HEATING, REFRIGERATING, AND AIR CONDITIONING ENGINEERS, INC. (ASHRAE) ASHRAE STD 33 - Methods of Testing Forced Circulation Air Cooling and Air Heating
27、 Coils (DoD adopted) ASHRAE STD 37 - Methods of Testing for Rating Unitary Air-Conditioning and Heat Pump Equipment (DoD adopted) ASHRAE STD 51 - Laboratory Methods of Testing Fans for Aerodynamic Performance Rating (Copies of this document are available from the American Society of Heating, Refrige
28、rating and Air Conditioning Engineers, Inc., 1791 Tullie Circle, N.E., Atlanta, GA 30329 or online at www.ashrae.org.) AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME) Boiler and Pressure Vessel Code, Section VIII, Division 1 - Pressure Vessels (Copies of these documents are available from the Americ
29、an Society of Mechanical Engineers, 345 East 47th Street, New York, NY 10017 or online at www.asme.org.) AMERICAN WELDING SOCIETY (AWS) AWS B2.1 - Specification for Welding Procedure and Performance Qualification (DoD adopted) AWS B2.2 - Brazing Procedure and Performance Qualification (DoD adopted)
30、(Copies of these documents are available from the American Welding Society, 550 NW LeJeune Road, Miami, FL 33216 or online at www.aws.org.) 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-24775A(SH) ASTM INTERNATIONAL ASTM A307 - Standard S
31、pecification for Carbon Steel Bolts and Studs, 60,000 PSI Tensile Strength ASTM E119 - Standard Test Methods for Fire Tests of Building Construction and Materials (DoD adopted) ASTM E662 - Standard Test method for Specific Optical Density of Smoke Generated by Solid Materials (DoD adopted) ASTM E800
32、 - Standard Guide for Measurement of Gases Present or Generated During Fires (DoD adopted) ASTM F1166 - Standard Practice for Human Engineering Design for Marine Systems, Equipment and Facilities (DoD adopted) (Copies of these documents are available from ASTM International, 100 Barr Harbor Drive, W
33、est Conshohocken, PA 19428-2959 or online at www.astm.org.) INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS (IEEE) IEEE STD 45 - IEEE Recommended Practice for Electric Installations on Shipboard (DoD adopted) (Copies of this document are available from the Institute of Electrical and Electronics E
34、ngineers, 445 Hoes Lane, P.O. Box 1331, Piscataway, NJ 08855-1331 or online at www.ieee.org.) NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA) NEMA MG 1 - Motors and Generators (DoD adopted) (Copies of this document are available from the National Electrical Manufacturers Association, 2102 L Str
35、eet N.W., Washington, DC 20037 or online at www.nema.org.) 2.4 Order of precedence. In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations
36、unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 First article. When specified (see 6.2), a sample shall be subjected to first article inspection in accordance with 4.2. 3.2 Materials. Cast iron shall not be used in the fan-coil unit nor shall cast iron be used in motors, which are
37、 components of the fan. Gray cast iron may be used for the fan and motor sheaves. Materials for fan-coil units shall be corrosion resisting or material shall be protected against corrosion after fabrication. Material degraded during the fabrication process shall be normalized to restore those proper
38、ties before assembled in any fan-coil unit. Selected materials shall be capable of meeting all of the operational and environmental requirements specified herein. 3.2.1 Hazardous material. Materials for use in the construction of fan-coil units shall have no effect on the health of personnel when th
39、e materials are used for intended purpose. Regardless of other requirements, materials and parts containing asbestos, cadmium, lithium, mercury, or radioactive material shall not be used. 3.2.2 Fasteners. Material for all bolts, nuts, studs, screws and similar fasteners shall be corrosion-resistant
40、passivated or of a material rendered resistant to corrosion and meet requirements of ASTM A307. Sheet metal screws shall not be used. Galling shall be prevented. Tapped holes shall be reinforced where shearing of thread can occur. 5 Provided by IHSNot for ResaleNo reproduction or networking permitte
41、d without license from IHS-,-,-MIL-PRF-24775A(SH) 3.2.3 Nonmagnetic construction. Unless otherwise specified (see 6.2), fan coil units of nonmagnetic construction shall have the cabinet unit, drain pan, mounting rails, filter, fans, fan motor bases, electrical components where available, grilles, an
42、d fasteners constructed on nonmagnetic material. Nonmagnetic material is defined as a material that has a maximum relative permeability of less than 2.0 after fabrication. Permeability shall be determined in accordance with MIL-STD-2124, test 501. 3.2.3.1 Motor material. Motor material shall conform
43、 to the requirements of IEEE STD 45 or NEMA MG 1 for nonmagnetic motors. 3.2.4 Dissimilar metals. Fan-coil unit and components shall not be degraded by electrolysis and conform to MIL-STD-889. 3.2.5 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally
44、 preferable materials should be used to the maximum extent possible, provided that the material meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life cycle costs. 3.3 Painting. The color of the fan coil assembly shall be Light Gray, Navy Formula 1
45、11 of MIL-DTL-15090, unless otherwise specified in 6.2. 3.4 Welding and allied processes. Surfaces of parts to be welded or brazed shall be free from rust, scale, paint, grease, and other foreign matter. Welding and allied processes shall be performed by personnel certified to AWS B2.1 and B2.2. NAV
46、SEA Technical Publication S9074-AR-GIB-010/278 shall be used for guidance. 3.5 Identification plate. Each fan-coil shall be provided with a permanently attached, corrosion-resistant identification plate. The plate shall be located in a prominent location on the unit that is easily visible in either
47、a horizontal or vertical orientation. Method of attachment of the identification plate shall be corrosion-resistant. The plate shall contain the following information: a. National stock number (NSN) b. Manufacturers name, commercial and government Entity (CAGE), and part number c. PIN code d. Contra
48、ct or order number 3.6 Interchangeability. Unless otherwise specified (see 6.2), all identically identified components shall be functionally and physically interchangeable without degradation of performance, reliability, or operating characteristics, and without selective assembly or modification ex
49、cept for calibration and adjustment. Repair parts shall be interchangeable with, and identically identified with, the parts they replace. 3.7 Operating life. Fan-coils shall have an operating life of 140,000 hours. The basis for design of replacement parts shall be 5 years of ship operation (37,300 hours). New and replacement heater elements shall be designed for an operating life of 21,000 hours. 3.8 Maintainability. The construction of fan-coil units s
