MIL-PRF-23798D(SH)
3.11.9 Type III, fan-coil assembly. The type III fan-coil assembly shall be a two-section unit consisting of a
cooling coil section which shall be the base of the assembled unit and a fan-motor section on top. Each section shall
be not greater than 25 inches in height, and when assembled together, the overall height of the unit shall be not
greater than 50 inches. The overall width and depth of each assembled unit shall be not greater than the dimensions
shown on Figure 1.
3.11.9.1 Cabinet. The cabinet shall be in accordance with 3.11.8.1.
3.11.9.2 Cooling coil section. The cooling coil section shall be as specified in 3.11.8.2.
3.11.9.3 Fan-motor section. The fan-motor section shall be as specified in 3.11.8.3, and shall have a single air
inlet, and a single air outlet located on top of the cabinet. The inside dimensions of the air inlet and the air outlet
shall be as shown on Figure 1. The air inlets and outlets shall have smooth flat surfaces for attachment of flanged
duct connections.
3.11.9.4 Static air pressure tap. A static air pressure tap shall be provided in accordance with 3.11.8.5.
3.12 Performance. The performance of the fan-coil assembly for a given airflow at specified dry bulb (DB) and
wet bulb (WB) air temperatures entering the cabinet and a specific water temperature at a flow of 3.6 gal/min/ton
through the cooling coil shall be as specified in Table II through Table VI, as applicable. Tolerances for airflow and
water flow shall be as specified in 3.12.1. The entering water temperature, the entering DB air temperature, and the
entering and leaving WB air temperatures shall be within plus or minus 0.5 degrees of that specified in the
applicable table.
3.12.1 Nominal capacity rating. The nominal capacity rating of the fan-coil assembly cooling coil shall be at
least equal to that specified in Table I, based on 80 °F DB temperature and 67 °F WB air temperature entering the
cabinet with 50.6 °F WB air temperature leaving the coil when the entering water is 45 °F. The airflow at the
cabinet outlet shall be within plus or minus 5 percent of the rated airflow specified in Table I. The water flow
through the coil shall be within plus or minus 5 percent of the rated water flow specified in Table I.
3.12.2 Inclined operation. Fan-coil assembly shall operate when permanently inclined 15 degrees from the
normal vertical position in any direction (see Figure 1).
3.12.3 Electrical requirements.
3.12.3.1 Power requirements. Unless otherwise specified, electric motors shall operate on 440-volt, three-
phase, 60-Hz power with the characteristics described in MIL-STD-1399-300.
3.12.3.2 Ambient temperature. All electrical components shall be designed for continuous operation in a
maximum of 50 °C ambient temperature.
3.12.3.3 Electrical motors. Motors for fan-coil assemblies shall be in accordance with IEEE STD 45. Motors
specified to be Grade A shock qualified in 6.2, shall be continuous duty HI shock qualified in accordance with
MIL-S-901. Motors for use in non-HI shock fan-coil assemblies (Type X) shall be commercial marine motors in
accordance with IEEE STD 45. Maximum horsepower shall not exceed values shown in Table I.
3.12.3.4 Cable entrance. Provisions shall be made for the entry of electrical cables to the fan-motor section of
the fan-coil assembly.
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