MIL-PRF-22594C(SH)
3.5 Identification plates. Each heater shall be provided with a permanently attached corrosion-resistant
identification plate. Attachment method for the identification plate shall also be corrosion-resistant. The plate shall
contain the following information:
a.
National stock number (NSN)
b.
Manufacturer's name, commercial and government entity (CAGE) code, and part number
c.
PIN code
d.
Contract or order number
3.6 Interchangeability. In no case shall parts be physically interchangeable or reversible unless such parts are
also interchangeable or reversible with regard to function, performance, and strength.
3.7 Operating life. The heater shall have an operating life of at least 126,000 hours. The basis for design of
replaceable parts shall be an equivalent of 5 years of ship operation (approximately 21,000 hours) before
replacement is necessary (see 3.11.8).
3.8 Workmanship. The heater assembly shall be free from defects that affect appearance and operation. Fin
edges of the heating elements shall be free of burrs and shall not be bent. Support sheets shall not crack due to
punching or forming. Sharp edges, burrs, and other imperfections shall be removed from all parts subject to contact
with personnel to prevent cuts during repair and maintenance. Cabinet corners shall be square and fasteners shall be
in place and secured.
3.9 Human engineering. The heater shall be arranged so as to achieve safe, reliable, and effective performance
by the operator and maintenance personnel and to optimize personnel skill requirements. ASTM F1166 shall be
utilized as a guideline in applying human engineering design criteria for the heater assembly.
3.10 Maintainability. The heater assembly shall be constructed so that the capability to maintain, disassemble,
and repair the unit may be demonstrated (see 4.5.7).
3.11 General design. The heater shall consist of three or more electrical elements (see 3.11.8). Standard wiring
shall be for single-stage operations with terminals marked for acceptance of shipboard cable. Up to four three-phase
stages may be provided by the contractor using the configuration of the standard single-stage heater. The terminals
and shipboard wiring shall be mounted and enclosed in a metal housing. This housing shall be provided with a
spraytight enclosure on one side for the electrical connection and a manual reset high limit cutout switch. The heater
shall be designed for overhead mounting and shall be provided with flanges on both the inlet and outlet sides for
connection to ductwork and shall be ready for installation and connection to a power source.
3.11.1 General shipboard design conditions. General shipboard design characteristics shall be as follows:
a.
Power source: In accordance with MIL-STD-1399-300:
(1) 440 volts, three-phase, 60-Hertz for Size 22EH, Types M and H, and Sizes 23EH through 38EH.
(2) 115 volts, three-phase, 60-Hertz for Sizes l9EH through 21EH and Size 22EH, Type L.
b.
Shall operate in accordance with requirements herein under a design entering dry bulb (DB)
temperatures of 0 °F minimum to 70 °F maximum.
Shall operate satisfactorily at airflows between 80 to 125 percent of rated airflow (see table I).
c.
d.
Where "standard air" conditions are referenced herein, they shall be defined as: dry air having a
density of 0.075 pounds per cubic foot, which corresponds to a temperature of approximately 69.4 ºF
dry bulb at a pressure of 14.696 pounds per square inch absolute.
3.11.2 Sizes. Sizes and types of heaters shall be limited to those specified (see 1.2).
3.11.3 Physical dimensions. To satisfy interface requirements and permit replacement, physical dimensions of
the heater shall be in accordance with the dimensions provided on figure 1.
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