MIL-PRF-23798D(SH)
4.6.3.1 Capacity tests. The capacity of each type and size fan-coil assembly shall be determined at the
conditions specified in 3.12.1 and at 45 °F chilled water temperature for the Note 2 points on Table II through Table
VI. The airflow through the fan-coil assembly shall be measured in accordance with ASHRAE 37. The capacity
tests of the cooling coil installed in the assembly shall be conducted in accordance with ASHRAE 33.
4.6.3.2 Flexibility and range tests. The leaving WB temperature and capacity (BTU/HR) for each type and size
fan-coil assembly shall be determined at the conditions specified in 3.11.6 and 4.6.3.1. Airflow measurement and
cooling coil tests shall be conducted as specified in 4.6.3.1. At least one test shall be conducted with the unit
inclined 15 degrees from the normal vertical position in any direction.
4.6.3.3 Limitation tests. The maximum acceptable operating limits (see Table II through Table VI) of each
type and size of fan-coil assembly shall be established without exceeding the total sound power levels specified in
Table VII limitations and without carryover of cooling coil condensate.
4.6.4 Airborne noise. Measurement of sound pressure levels (octave band, flat, unweighted) and computation
of sound power levels (octave band) shall be in accordance with procedures and instrumentation requirements
defined in AMCA 300, and amendments to those procedures as identified herein. Procedures of AMCA 300 shall be
modified to substitute the term "fan-coil assembly" in place of the word "fan". All sound measuring instrumentation
shall be laboratory calibrated within one year of the date of test, excluding the reference sound source which shall
comply with the laboratory calibration requirements stated in AMCA 300. A random incidence response
microphone and a type I (precision) sound level meter conforming to the requirements of AMCA 300 shall be used.
The fan-coil assembly shall be operated at fan speed providing nominal airflow delivery conditions for the size unit
under test (see Table II through Table VI, herein), based upon internal pressure drop and fan performance curves.
For a type III fan-coil assembly an external static pressure of 2 in. w.g. shall be maintained at all times. When duct
sections are attached to a fan-coil assembly to facilitate testing, they shall be attached to the fan-coil assembly with
flexible duct connectors. Duct sections shall be rigid, heavy gauge metal ducts and/or non-perforated, double wall
ducts to eliminate noise contributions transmitted through duct walls. When a duct section is attached to a fan-coil
assembly to facilitate measurements, the duct section shall have the same interior, open cross sectional dimensions
as the opening in the fan-coil assembly to which it is attached. There shall be no exposed sound absorbing material
on the interior or exterior surfaces of the attached ducts.
4.6.4.1 Total sound power levels for a type II fan-coil assembly. Test and calculation procedures to determine
total sound power for a type II fan-coil assembly shall be performed in accordance with Figure 1 of AMCA 300.
The cover plate shall be removed from the air inlet opening. The cover plate shall be removed from the air outlet
opening in the top surface only. No duct sections shall be attached to the fan-coil assembly.
4.6.4.2 Total sound power levels for a type III fan-coil assembly. Test and calculation procedures to determine
total sound power levels for a type III fan-coil assembly shall be performed in accordance with Figure 1 of AMCA
300, or Appendix H of AMCA 300 installation type B: free inlet/ducted outlet, when a discharge duct and an orifice
plate are installed to achieve design pressure. When an orifice plate is installed, it shall be a quiet type which does
not produce excessive flow-induced noise. When a discharge duct is installed to achieve an external static pressure
of 2 in. w.g., a short section of duct containing one 90-degree elbow shall be attached to the air outlet located in the
top of the fan-coil assembly. The interior open cross sectional dimensions of the duct, including elbow shall be
identical to those of the air outlet (discharge) opening of the fan-coil assembly. The length of the duct shall be such
that the discharge end of the duct does not extend more than 1 ft. beyond the rear vertical edge of the casing of the
fan-coil assembly. No portion of the duct shall extend more than 2.5 ft. above the top horizontal edge of the fan-coil
assembly. The cover plate shall be removed from the air inlet. The microphone travel shall be such that a direct line
of sight between the microphone and the inlet air opening and/or the outlet air opening shall be maintained.
4.6.5 Permeability tests. A permeability test of nonmagnetic material use in construction of fan-coil assembly
shall be conducted in accordance with MIL-STD-2142, Test 501 (see 3.2.5).
4.6.6 Motor tests.
a.
The insulation resistance test and the dielectric strength test shall be conducted in accordance with
IEEE STD 45.
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