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, and 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 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
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 111 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. NAVSEA 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 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.
Manufacturer's name, commercial and government Entity (CAGE), and part number
c.
PIN code
d.
Contract 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 except 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 shall be as follows for maintainability:
a.
Air filters shall be accessible for cleaning and/or replacement. Air filters shall be accessible without
the use of any tools or requiring power to the fan-coil unit to be secured. Access panels, if used, shall
have quick-acting fasteners to secure the panel in the closed position. There shall be no danger of
electrical energy or mechanical hazard to personnel changing filters.
b.
Fans and fan motors shall be accessible for servicing, testing, replacement, or for all three purposes by
removal of a bolted access panel.
c.
Cooling coil shall be accessible for cleaning, or replacement, or both. Coil cleaning shall be
accomplished without removal of cooling coil. Cooling coil shall be accessible for venting, or
draining, or both without removing a bolted access panel.
d.
Electric heater shall be accessible for servicing and testing.
e.
Wiring, terminals, and electrical connections shall be accessible for servicing and testing. Removal of
fan, motor, heater, or other electrical components shall not be required.
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