1、MIL-H-438756 73 7777706 0242223 7 MIL-H-43895B 24 June 1986 SUPERSEDING MIL-H-43895A 25 August 1976 MILITARY SPECIFICATION HEATERS, HOT WATER BOOSTER, ELECTRIC; SINK, SANITIZING This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. T
2、his document covers electric water heaters designed to increase a sinks hot water temperature to 180F, 1.2 Classification. Heaters shall be of the following types and power ratings (see 6.1 and 6.2). Type Power rating (kilowatts) Dir e c t current (dc) 6 Alternating current (ac) 3, 4.5, 6, 9 2. APPL
3、ICABLE DOCUMENTS 2.1 Government documents. Unless otherwise specified, the following documents of the issue in effect on date of invitation for bids or request for proposal form a part of this document to the extent specified herein. I 1 Beneficial comments (recommendations, additions, deletions) an
4、d any pertinent data which may be of use in improving this document should be addressed to: U.S. Army Natick Research, Development and Engineering Center, Natick, MA 01760-5014 by using the : =if-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this docu
5、ment or by letter. 1 1 msc N/A FSC 7320 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-H-43895B SPECIFICATIONS FEDERAL PPP-B-636 - Boxes, Shipping, Fiberboard MI L
6、I TARY MIL-L-35078 - Loads, Unit: Preparation of Semiperishable Subsistence Items; Clothing, Personal Equipment and Equipage: General Specification For STANDARDS MI LI TARY MIL-STD-105 - Sampling Procedures and Tables for Inspection by MIL-STD-129 - Marking for Shipment and Storage MIL-STD-130 - Ide
7、ntification Marking of US Military Property MIL-STD-255 - Electric Voltages Alternating and Direct Current Attributes (Copies of documents required by contractors in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting offi
8、cer,) 2.2 Other publications. Unless otherwise specified, the following documents of the issue in effect on date of invitation for bids or request for proposal - form a part of this document to the extent specified herein. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) A 167 - Stainless and Heat-
9、Resisting Chromium-Nickel Steel Plate, Sheet and Strip D 3951 - Standard Practice for Commercial Packaging (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) UNDERWRITERS LABORATORIES, INC. (UL) UL 174 - Household
10、 Electric Storage-Tank Water Heaters UL 499 - Electric Heating Appliances (Application for copies should be addressed to the Underwriters Laboratories, Inc., 333 Pfingsten Rd., Northbrook, IL 60062.) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
11、MIL-H-438958 73 W 9999906 02qZZ25 O W MIL-H-43895B (Technical society and technical association documents are generally available for reference from libraries, They are also distributed among technical groups and using Federal agencies.) +: 2.3 Order of precedence. In the event of a conflict between
12、 the text of this document and the references cited herein (except for associated detail specifications, specification sheets or MS standards), the text of this docu- ment shall take precedence. Nothing in this document, however, shall supersede applicable laws and regulations unless a specific exem
13、ption has been obtained. 3. REQUIREMENTS 3.1 Standard product. The heaters shall, as a minimum, be in accordance with the requirements of this document and shall be the manufacturers standard commercial product with any added features needed to comply with the requirements of this document. Modifica
14、tions to add features shall not incorporate different parts unless such parts are used on other current commercial models. Standard or modified commercial products furnished in accordance with this document shall be identifiable by all regular manufacturers or commercial service organizations servic
15、ing the brand involved. Service organizations shall be capable of providing complete parts and repair services on models furnished to the Government consistent with their normal commercial practices. s: 3.2 Codes and standards. The heaters shall comply with the applicable requirements of UL 174 or U
16、L 499 (see 4.1.2.1). * 3.3 Materials. Materials shall be as specified herein. Materials not definitely specified shall be of the quality normally used by the manufacturer in his standard heater provided the completed item complies with all provisions of this document. Recycled material may be used (
17、see 6.3). 3.3.1 Stainless and heat-resisting steel sheet, plate, and strip. Stainless and heat-resisting steel sheet, plate, and strip shall conform to type 302 or 304 of ASTM A 167. 3.4 Design and construction. The sink heater shall consist of a water heating reservoir, a waste collecting reservoir
18、, controls, safety device(s), and intake and outlet sink plumbing connections. The heater shall be designed to be securely mounted to the underside of.the sink. The heater shall be designed to boost the temperature of 140F water to a minimum of 180F and shall function by means of the sink water circ
19、ulating through the heating reservoir and back to the sink.by convection currents. The water heating reservoir shall be filled with water, even when the sink is drained, and there shall not be any leakage when tested as specified in 4.4.1. Maximum overall dimensions, excluding plumbing fittings, sha
20、ll be 18 inches long, inches wide, and 10 1/4 inches high. 3.4.1 Sink connections. Intake and outlet sink plumbing connections shall be provided for attaching the heater to the sink. Overall height of connections 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license
21、from IHS-,-,-MIL-H-43895B shall not exceed 2 7/8 inches when installation to the sink is completed, Connections shall be along the center top of the unit. 3.4.2 Waste collecting reservoir. A waste collecting reservoir, adjacent to the water heating reservoir, shall be provided to remove and trap was
22、te particles from the main stream of the circulating water. . 3.4.2.1 Waste outlet. The waste reservoir shall be fitted with a quick opening discharge valve for the purpose of draining the waste reservoir without draining the heater reservoir. accessible to the operator when facing the front of the
23、heater. If the point of discharge of the discharge valve is a floor drain, there shall be an air gap or other backflow prevention device between the valve and drain. The valve operating handle shall be readily 3.4.3 Electrical characteristics. Unless otherwise specified (see 6.2), the heaters shall
24、operate on specified nominal system voltages of 120/208, 120/240 or 450-480 volts, 50/60 hertz (Hz), except that for dc operation the heater shall be 6 kW, with minimum 230 volts dc (vdc). The heater control system shall operate on nominal system voltages of 120, 208-240 volt ratings in ac. For line
25、 voltages over 240 volts ac (vac), the control circuit transformer shall be used to reduce the control voltage to 240 volts or 120 volts. Heaters designed for use on utilization equipment having nominal voltages of 230 or 115 vdc ratings shall have a 120 vac, 50/60 Hz control circuit. Nominal system
26、 voltages and utilization equipment nominal voltages shall be as specified in MIL-STD-255. When specif ied for shipboard installation (see 6.2), all electrical equipment shall be designed for operation on an ungrounded electrical system, but shall operate satisfactorily in accordance with this docum
27、ent without hazard to personnel or equipment in event of an accidental ground on any conductor. When specified for Naval shipboard installation (see 6.2), and except direct current applications, the heater shall operate on 440 vac, 3 phase, with the load balanced between phases. 3.4.3.1 Control syst
28、em, The control system shall consist of the contactors, relays, thermostats, and indicators necessary to provide temperature control and indication of operation. 3.4.3.2 Heating elements. The heating elements shall be of the type and power rating specified (see 1.2 and 6.2). sheathed corrosion-resis
29、tant type installed in the heating reservoir and shall be removable for replacement. Heating elements shall be the 3.4.3.2.1 Empty waste collector reservoir cutout. An electrical. cutout, with manual reset, shall be provided to prevent heating element damage when the waste collecting reservoir is pa
30、rtially or completely empty of water. 3.4.3.3 Controls. The ON-OFF switch and indicator lights shall be mounted on the front of the heater, while the contactors, relays, and electrical terminal block shall be located in the base of the heater. 4 Provided by IHSNot for ResaleNo reproduction or networ
31、king permitted without license from IHS-,-,-MIL-H-438958 73 W 999990b 0292227 4 = MIL-H-43895B 3.4.3.3.1 Temperature indicator. The sink heater shall be provided with two indicator lights and an integral temperature indicator. A yellow indicator light shall indicate when the unit is energized, and a
32、 red indicator light shall indicate exceeded function integral or above that the sink or reservoir is dry-or that water temperature has 205OF, when tested as specified in 4.4.1. A label describing the of the indicator lights shall be mounted next to the lights. The temperature indicator shall indica
33、te when the water in the sink is at a temperature of 180OF. 3.4.3.3.2 ON-OFF switch and warning plate. An ON-OFF switch for energizing the unit shall be provided except for shipboard dc operation (see 3.4.3.3.3). The switch shall break all legs of the control circuit when in the “OFF“ position. A wa
34、rning plate, positioned adjacent to the ON-OFF switch, shall warn against turning the unit on without water in the sink. The warning plate shall be marked and attached in a permanent manner. 3.4.3.3.3 Control box. For shipboard dc operation (see 6.21, a separate control box shall be provided for ins
35、tallation near the sink where the heating unit is mounted. The control box shall contain a water-resistant, circuit breaker type ON-OFF switch and a warning plate as specified in 3.4.3.3.2, indicator lights and labels as specified in 3.4.3.3.1, contactor, relay, and electrical terminal block. An ele
36、ctrical cable not less than 8 feet long shall connect the control box with the sink heater. 3.4.3.4 High temperature cutout. A high temperature cutout, with manual reset, shall be provided that, when tested as specified in 4.4.1, shall open the power circuit to the heaters and prevent overheating da
37、mage when the water temperature has reached 2050F, or when the sink is dry (without water). cutout may be combined with the cutout specified in 3.4.3.2.1, provided that both functions can be accomplished. This 3.4.3.5 Thermostat. The thermostat installed on the unit shall be capable of automatically
38、 controlling the temperature of the water in the sink between 1800F and 1950F. When tested as specified in 4.4.1, the sink water shall be maintained in this temperature range for 4 hours. A means shall be provided for adjusting the thermostat setting from the front of the heater unit. 3.5 Operation.
39、 Unless otherwise specified (see 6.2), the heater when attached to a sink (see table I) shall be capable of heating 140F water to 1700F in 45 minutes or less when tested as specified in 4.4.1. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-H-4
40、395B 73 9977Ob 0242228 b MIL-H-43895B TABLE I. Heater rating - water volume Heater rating Volume of water to be heated 3 kW 4.5 kW 6 kW 9 kW Up to 5,000 cubic inches 5,001 to 6,500 cubic inches 6,501 to 11,500 cubic inches 11,501 to 18,000 cubic inches f: 3.6 Data name plate. The heaters shall be fu
41、rnished with a data name plate in accordance with the applicable requirements of MIL-STD-130 except the requirements for (a) methods of applying, (b) identification tags, (c) information not required, and (d) optional marking information shall not apply. The data name plate shall be made of minimum
42、20 gage corrosion-resisting metal, and attached to heaters by rivets, screws, or by welding in such a manner as to meet the applicable National Sanitation Foundation requirements for this equipment, stamped, engraved, or applied by photosensitive means: The plate shall bear the following information
43、 which shall be National stock number Acquisition instrument identification number Document data Manufacturers name, address, and telephone number Suppliers name, address, and telephone number (list only if different Manufacturers model number Government approved manual number (see 6.2) from manufac
44、turer) Each data name plate and precaution plate (see 3.6.1) shall be placed so as to be readily visible to the operator during normal generation and use and so as not to adversely affect the life utility of the heater, 3.6.1 Precaution plate. The precaution plate shall be fastened to the outside fr
45、ont of the heater. The plate shall be of sufficient overall size to contain, in legible characters, the following: WARNING 180F WATER TEMPERATURE * 3.7 Finish. Heaters shall be smooth on all surfaces and edges and shall be free from discoloration, rust, or stains. The heater shall be finished in acc
46、ordance with the manufacturers standard practice, For Naval shipboard use (see 6.2), heaters shall be constructed with stainless steel body and base. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-H-q3895B 73 m 9999906 02Li2229 B MIL-H-43895B
47、3.8 Workmanship. All components and assemblies of the heater shall be free from dirt and other harmful extraneous material, burrs, slivers, rough die marks, tool and grind marks, dents, and cracks. stampings, if used, shall be free of sand, fins, pits, blow holes, and sprues. External surfaces shall
48、 be free from sharp edges and sharp corners. Castings, molded parts, and 3.8.1 Metal fabrication. Metal used in the fabrication of the heater shall be free from kinks. Forming and shearing shall not cause damage to the metal. 3.8.2 Welding. The surfaces of parts to be welded shall be free from rust,
49、 scale, paint, grease, and other foreign matter. Welds shall be smooth and free of cracks, burn holes, undercuts, and incomplete fusion. All scale shall be removed from the finish weld area, 3.8.3 Fastening devices. Holes shall have burrs removed. Threaded fasteners shall not be broken, cracked, or stripped and shall be drawn tight. A locking device shall be used on all bolts. the heads shall be in full contact with the surface of the member and concen
