1、I INCH-POUND I h MIL-PRF-12574M 9 June 1997 SUPERSEDING MIL-R-0012574L (GL) 22 May 1992 MIL-R-12574K 30 June 1988 Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: U.S. Army Natick Research, Devel
2、opment, and Engineering Center, Natick, MA 01760-5018 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. 1 PERFORMANCE SPECIFICATION REFRIGERATION UNITS, MECHANICAL, PANEL TYPE, 5000 BTU REFRIGERATOR, FIELD, PO
3、RTABLE (150 CUBIC FOOT) FOR This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This document covers two types of panel type, mechanical, refrigeration units having a capacity of 5000 British thermal units (Btu) per hour and used w
4、ith a 150-cubic foot, portable field refrigerator (see 6. i) . 1.2 Classification. The refrigeration units will be of the following types as specified (see 6.2): Type I - Diesel Engine Driven Type II - Electric Motor Driven 2. APPLICABLE DOCUMENTS AMSC N/A FSC 4110 Provided by IHSNot for ResaleNo re
5、production or networking permitted without license from IHS-,-,-MIL-PRF-12574M 2.2 2 nts. 2.2.1 d . The following standards form part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense
6、Index of Specifications and Standards (DoDISS) and supplement thereto, cited in the solicitation (see 6.2) . STAN DARDS DEPARTMENT OF DEFENSE MIL-STD- 4 6 1 - Requirements for the Control of Electromagnetic Interference Emissions and Susceptibility Characteristics Guidelines MIL-STD-462 - Measuremen
7、t of Electromagnetic Interference MIL-STD-8 10 - Environmental Test Methods and Engineering MIL-STD-147 4 - Noise Limits for Military Materiel (Metric) (Unless otherwise indicated, copies of the above standards are available from the Standardization Document Order Desk, 700 Robbins Avenue, Building
8、4D, Philadelphia, PA 19111-5094). 2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of the documents which are .DoD adopted are those listed in the issue of the DoDISS cited in the solicitation
9、. Unless otherwise specified, the issues of documents not listed in the DoDISS are the issues of the documents cited in the solicitation (see 6.2). NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION Standards Publication No. 250 - Enclosures for Electrical E quipme n t (Application for copies should be a
10、ddressed to the National Electrical Manufacturers Association, 1300 No. 17th Street, Suite 1847, Rosslyn, VA 22209). NATIONAL FIRE PROTECTION ASSOCIATION (NFPA) Standard No. 70 - National Electrical Code 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-
11、,-,-I MIL-PRF-12574M 9999906 2042908 140 MIL-PRF-12574M (Application for copies should be addressed to the National Fire Protection Association, One Battery March Park, Quincy, MA 02269-9101). UNDERWRITERS LABORATORIES INC. (UL) Standard 207- Refrigerant Containing Components and Standard 486- Wire
12、Connectors and Solder Lugs Accessories, Nonelectrical (Application for copies should be addressed to the Underwriters Laboratories, Inc., 333 Pfingsten Road, Northbrook, IL 60062-2096). 2.4 Order of mecedence. In the event of a conflict between the text of this document and the references cited here
13、in, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations 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 accorda
14、nce with 4.1.1. 3.2 op eratinu recruirements. Refrigeration units shall satisfy the following functional, operational and performance requirements. 3.2.1 4-hour oneration. Refrigeration units shall operate properly with suction and discharge pressures safely controlled. 3.2.2 72-hour operation. Refr
15、igeration units shall operate properly and maintain noted conditions at thermostat settings of OF and 35F. 3.2.3 Refrigeration can acitv. Refrigeration units shall have minimum net capacities of 5,000 Btu/hr at a thermostat setting of OF and 7,500 Btu/hr at a thermostat setting of 35F. 3.2.4 Defrost
16、 svstem. Refrigeration units shall have a defrost cycle terminated by temperature, automatically initiated by a time control adjustable between 6 and 24 hours and have the capacity to produce not less than 6 pounds of condensate within 30 minutes. 3.2.5 Moisture content. The moisture content of the
17、refrigeration system shall be kept at a minimum to maintain proper operation of the refrigeration unit. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-12574M 3.2.6 Refriaerant leakaue. Refrigerant containing components shall be gastight. 3
18、.2.7 Operation time. Type I refrigeration units shall operate for a minimum of 38 hours without refueling. 3.2.8 Control panel. The refrigeration units shall have a control panel for the operator having, but not limited to, the following items: 1. 2. 3. 4. 5. 6. 7. 8. 9. Start, run, stop control Ope
19、ration indicator Refrigerator temperature control Refrigeration unit running time indicator High and low side pressure indicators Refrigerator interior temperature indicator Defrost operation indicator Fuel capacity indicator for type I units Battery charging circuit voltage indicator for type I uni
20、ts 3.2.9 Ozone-deDletina substances. The refrigerant shall be commercially available nonozone-depleting, and environmentally safe. Class I ozone-depleting substances, as determined by the Environmental Protection Agency, shall not be contained in, and shall be prohibited from use during the fabricat
21、ion of the refrigeration units (see 6.6) . 3.2.10 TemDerature control. The selected temperature of the refrigeration units shall be controlled automatically. temperature control shall allow an incremental selection of normal refrigerator temperatures. The 3.2.11 1 Di . Unless otherwise specified for
22、 type I refrigeration units (see 6.2), the diesel engines electrical system shall operate on 12-volt direct current (DC). The engine shall operate on diesel and JP-8 fuels. 3.2.12 Power reauirements. Unless otherwise specified for type II refrigeration units (see 6.2), the refrigeration units shall
23、operate on 208/230 volt, 3-phase, 60-hertz (Hz) and 3-phase, 50-Hz power on the voltage specified in the contract or order (see 6.2). 3.2.13 Finish. The refrigeration units except where detrimental to proper operation shall have a nontoxic chemical agent resistant green finish (see 6.7.1). The word
24、“CARC“, together with the month and year of finishing, shall be stencilled near the identification plate in block letters not less than 1 inch high using lusterless 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. NIL-PRF-12574M m 9999906 2042930
25、8T9 m MIL-PRF-12574M * black chemical agent resistant paint (see 6.7.2) All paint shall be properly applied. 3.2.14 Safetv. The refrigeration units shall minimize flammability, operational, toxic and personnel hazards. 3.2.15 Airflow. The air exiting the evaporator shall be directed to create proper
26、 circulation inside the refrigerator it is used with. 3.3 Surmort or ownership reuuirements. Refrigeration units shall meet the following requirements. 3.3.1 Weiuht. The net weight of the refrigeration units, including oil and refrigerant, shall be not more than 775 pounds for type I units, excludin
27、g the battery and fuel, and not more than 775 pounds for type II units. 3.3.2 Transportabilitv. Refrigeration units shall be able to be handled by a forklift truck. 3.3.3 Desian reliabilitv. Refrigeration units shall operate properly for not less than 2500 hours. 3.3.4 Service and maintenance. All m
28、ajor components shall be accessible for adjustment, maintenance, servicing, and replacement without removing any other major component. All other components and assemblies shall be designed for ease of installation and replacement and shall be accessible for maintenance, repair, service and replacem
29、ent with minimum disturbance to adjacent components. No special tools shall be needed for any maintenance, repair, service, installation or replacement action. Condenser and evaporator fins shall be protected from any damage that might occur during servicing or maintenance actions. Operator personne
30、l shall be able to visually check the moisture content of the refrigeration system on all refrigeration units and the compressor crankcase oil level on type I units. 3.3.5 Markinq. Identification, instruction, control and gage plates shall be of corrosion-resistant material permanently attached to t
31、he outside of the refrigeration unit. Numbering and lettering shall be legible and permanently inscribed and shall be no less than 1/16 inch in height. All plates shall blend with the framed enclosure finish and shall have a nonreflective surface. 5 Provided by IHSNot for ResaleNo reproduction or ne
32、tworking permitted without license from IHS-,-,- MIL-PRF-32574M W 9999906 2042933 735 m MIL-PRF-12574M 3.3,5.1 Identification plate. The identification plate shall contain the kollowing information: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. U.S. Military model number and nomenclature National Stock Number
33、(NSN) Serial number Contract number Manufacturers name and address Manufacturers model number Commercial and Government Entity (CAGE) number Technical manual number, if applicable, (see 6.2 and 6.5 Weight Refrigerant used 3.3.5.2 Instruction D lates. Instruction plates shall contain the wiring and r
34、efrigeration cycle diagrams, instructions for start-up, operation, shutdown and preventive maintenance. 3.3.5.2.1 Electr ical instruction plate. Type II refrigeration units shall have an electrical instruction plate conforming to all requirements of 3.3.5, except it shall be located near the electri
35、cal supply junction box. The plate shall be visible from outside the refrigeration unit and shall contain the wording “For 60-hertz operation use 208/230 volt, 3-phase power source only. For 50-hertz operation use “x“ volt, 3-phase power source only.“ The voltage specified in the contract or order (
36、see 6.2) for 50- hertz operation shall be marked in the “x“ location. 3.3.5.3 C e lates. All controls and gages shall have identifying nameplates. 3.3.5.4 Electrical wirinq. Electrical wiring shall be marked to allow identification with the wiring diagram. 3.3.6 Interchanaeab ilitv. All component pa
37、rts of the refrigeration unit shall be interchangeable with the same parts of other units furnished under the same contract. 3.4 Environmental reuuirements. Refrigeration units shall operate under the following environmental conditions. 3.4.1 Ambient temDerature. The refrigeration units shall operat
38、e in ambient temperatures from OF to 125F. 3.4.2 Rainfall. The refrigeration unit shall operate in rainfall. 3.4.3 Shock and vibration. The refrigeration units shall be operable after being subjected to shock and vibration. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted witho
39、ut license from IHS-,-,- HIL-PRF-lt2574M W 999990b 2042932 b7L W 8 MIL-PRF-12574M 3.4.4 Electromagnetic compatibilitv. When specified (see 6.2), the type I and type II refrigeration units shall not exceed radiated emission (RE)102 limits for ground applications (Navy fixed and AF) over a range of 2
40、megahertz (MHz) to 400 MHz. When specified (see 6.2), type II refrigeration units shall not exceed conducted emission (CE) 102 limits. 3.4.5 Storage conditions. The refrigeration units shall remain operable after storage in temperatures of minus 65F to plus 155F. 3.4.6 Noise 1 evel. The noise levels
41、 at personnel “operators“ and “servicing“ positions shall not damage personnel hearing. 3.4.7 Corrosion resistance. The refrigeration units shall operate after exposure to a salt fog atmosphere. . 3.4.8 Grounding for shipboard use. When type II units are procured for Navy shipboard use (see 6.2), pr
42、ovisions shall be made to permanently ground and bond all interior and exterior metal sheathing and the frame of the motor to a grounding rod. 3.5 Interface and interomerabilitv reuuirements. The refrigeration units shall be designed for use with 150-cubic foot refrigerators (see 6.1) and shall have
43、 overall dimensions no greater than those shown on figure 1. 4. VERIFICATION 4.1 1. The inspection requi.rements specified herein are classified as follows: a. First article inspection (see 4.1.1) b. Conformance inspection (see 4.1.2) 4.1.1 First article inmeetion. When a first article inspection is
44、 required (see 3.1 and 6-21, a sample shall be examined for all the verifications listed in table I. 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.4.1 3.4.2 3.4.3 4.3.4.1 4.3.4.2 4.3.4.3 3.4.1 4.3.4.1 MIL-PRF-12574M ,E I. .cation methods Title
45、TA: Require- ment Verification Title OPERATING REQUIREMENTS 3.2 4.3.2 Design reliability 4.3.3.3 I 3.3.3 3.3.4 4.3.3.4 =I= 3.3.5 4.3.3.5 4-hour operation 3.2.1 4.3.2.1 Service and mainte nance 3.2.2 4.3.2.2 Marking 72-hour operation Ref rigera t ion capacity 3.2.3 4.3.2.3 3.3.5.1 4.3.3.5.1 I Identif
46、ication plate Instruction plates Electrical instruction plate Defrost system 3.2.4 3.3.5.2 4.3.3.5.2 4.3.2.4 4.3.2.1 Moisture content 3.2.5 3.3.5.2. 1 4.3.3.5.2.1 3.2.6 4.3.2.1 Control and gage nameplates 3.3.5.3 4.3.3.5.3 Refrigerant leakage Operation time (type I) 3.2.1 4 .3.2.2d Electrical wiring
47、 Control panel 3.2.8 4.3.2.5 Interchangeability ENVIRONMENTAL REQUIREMENTS Ozone-depleting substances 3.2.9 4.3.2.6 3.4 14.3.4 Temperature control 3.2.10 4.3.2.1 Ambient temperature 3.2.11 4.3.2.8 Rainfall Diesel engine operation (type I) Power requirements (type II) 3.2.12 4.3.2.9 Shock and vibrati
48、on Finish 3.2.13 4.3.2.10 3.4.4 4.3.4.4 I 3.4.5 4.3.4.5 Electromagnetic compatibility Safety 3.2.14 4.3.2.11 Storage conditions Noise level Corrosion resistance Airflow 3.2.15 4.3.2.1 3.4.6 14.3.4.6 3.3 4.3.3 SUPPORT OR OWNERSHIP REQmReMeNTS Weight 3.3.1 4.3.3.1 3.4.8 14.3.4.8 Grounding for Navy INT
49、ERFACE AND INTEROPERABILITY REQUIREMZNTS Transportability 3.3.2 3.5 4.3.3.2 4.3.5 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-LZ574M 9999906 2042914 444 Requirement Paragraph 3.2.1 3.2.2 MIL-PRF-12574M Characteristic Verification Paragraph 4-hour operation 4.3.2.1 72-hour operation 4.3.2.2 4.1.2 Conformance ins
