MIL-PRF-24775A(SH)
3.13 Environmental conditions.
3.13.1 Shock. Unless otherwise specified in 6.2, fan-coil units shall pass the HI shock tests specified in MIL-S-
901 for grade A, class I, type A equipment (see 4.5.3.1). Internal shock and vibration mounts shall be provided in
conjunction with the mounting arrangement for the fan and motor assembly.
3.13.2 Vibration. Fan-coil units shall withstand, without damage or malfunction, environmental vibrations in
accordance with MIL-STD-167-1 for type I "environmental vibration" for frequencies up to and including 33 Hz.
The rotating components of the fan-coil units shall meet the balance requirements of MIL-STD-167-1 for type II
vibration.
3.13.3 Airborne noise. The total sound power level for a fan-coil unit shall not exceed the levels specified in
3.13.4 Replenishment air. Replenishment air introduced into fan-coil unit is sea air at temperatures of 40 °F to
95 °F.
TABLE II. Airborne noise sound power levels (un-weighted) in decibels (dB) referenced to 10-12 watt.
Octave band center frequency (Hz)
Fan-coil
63
125
250
500
1000
2000
4000
8000
unit size
1
82
79
76
73
70
67
64
61
2
82
79
76
73
70
67
64
61
3
82
79
76
73
70
67
64
61
4
82
79
76
73
70
67
64
61
5
82
79
76
73
70
67
64
61
6
82
79
76
73
70
67
64
61
7
82
79
76
73
70
67
64
61
8
82
79
76
73
70
67
64
61
3.14 Labels.
3.14.1 Safety label plates. Safety label plates, requesting electric power shut-off before removal of access
plates for testing or maintenance, shall be installed in a visible location on the front of vertical units and on the
underside of horizontal units.
3.14.2 Terminal boards and covers. Terminal boards and covers over equipment shall be marked.
3.14.3 Wiring diagram. A reduced copy of the heater wiring diagram shall be permanently attached to the
inside of the enclosure access cover for indication of the electrical connections.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:
a.
First article inspection (see 4.2).
b.
Conformance inspection (see 4.3).
4.2 First article inspection. First article inspection shall be performed on each size fan-coil unit when a first
article sample is required (see 3.1). This inspection shall include the examination of 4.4 and the tests of Table III.
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