1.3 1301348075 MIL-PRF-23798E Encl (1).pdf

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Distribution Statement A. Approved for public release: distribution is unlimited.

INCH-POUND

MIL-PRF-23798E(SH)

3 July 2023

SUPERSEDING

MIL-PRF-23798D(SH)

13 December 2004

PERFORMANCE SPECIFICATION

AIR CONDITIONER, FAN-COIL ASSEMBLY

This specification is approved for use by the Naval Sea Systems Command and is available for use by all

Departments and Agencies of the Department of Defense.

1. SCOPE

1.1 Scope. This specification covers prefabricated fan-coil assemblies for use in conjunction with a chilled water system for air conditioning spaces onboard naval surface ships.

1.2 Classification. The fan-coil assemblies are of the following types, sizes, capacities (grades), and compositions, as specified (see 6.2).

1.2.1 Types. The types of air conditioning fan-coil assemblies are as follows:

a. Type II - Three-section unit consisting of a cooling coil section, fan-motor section, and air distribution plenum section (high-impact [H.I.] shock)

b. Type III - Two-section unit consisting of a cooling coil section and fan-motor section (H.I. shock)

1.2.2 Sizes.

1.2.2.1 45 °F chilled water. The sizes of air conditioning fan-coil assemblies are as follows for 45 °F chilled water:

Size Nominal capacity 1/

21 31,300 British thermal units per hour (Btu/h)

22 51,200 Btu/h

23 77,600 Btu/h

24 99,800 Btu/h

25 151,300 Btu/h

NOTE:

1/ See 3.12 and table XI for conditions.

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ENCLOSURE (1)

MIL-PRF-23798E(SH)

1.2.2.2 43 °F chilled water. The sizes of air conditioning fan-coil assemblies are as follows for 43 °F chilled water:

Size Nominal capacity 1/

21 30,675 Btu/h

22 50,940 Btu/h

23 76,250 Btu/h

24 98,770 Btu/h

25 146,070 Btu/h

NOTE:

1/ See 3.12 and table XII for conditions.

1.2.3 Grades. The grades of air conditioning fan-coil assemblies are as follows:

a. H.I. Shock

b. Type X (Non-H.I.-Shock unit)

1.2.4 Composition. The composition of air conditioning fan-coil assemblies is as follows:

a. M - Magnetic

b. N - Nonmagnetic

1.3 Part or identifying number (PIN). PINs to be used for prefabricated fan-coil assemblies acquired to this specification are created as follows:

M 23798 - X XX X X

Prefix for

Military

Specification

Specification

Number

- Type

(see code below)

Size

(see code below)

Grade

(see code below)

Composition

(see code below)

Type Code Size Code Grade Code Composition Code

Type Code Size Code Grade Code Composition Code

II A 21 21 H.I.-shock H M M

III B 22 22 Type X X N N

23 23

24 24

25 25

Examples: M23798-A21HM

M23798-B24XN

2. APPLICABLE DOCUMENTS

2.1 General. The documents listed in this section are specified in sections 3 and 4 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3 and 4 of this specification, whether or not they are listed.

2.2 Government documents.

2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.

FEDERAL SPECIFICATIONS

TT-C-490 - Chemical Conversion Coatings and Pretreatments for Metallic Substrates (Base for

Organic Coatings)

TT-P-645 - Paint, Alkyd Type, Formula Number 84

DEPARTMENT OF DEFENSE SPECIFICATIONS

MIL-DTL-901 - Shock Tests, H.I. (High-Impact) Shipboard Machinery, Equipment, and Systems, Requirements For

MIL-DTL-15090 - Enamel, Equipment, Light Gray (Navy Formula No. 111)

MIL-PRF-16552 - Filters, Air Environmental Control System, Cleanable, Impingement (High

Velocity Type)

MIL-PRF-32514 - Insulation, Anti-Sweat, Refrigerant, and Thermal Foam

DEPARTMENT OF DEFENSE STANDARDS

MIL-STD-167-1 - Mechanical Vibrations of Shipboard Equipment (Type I - Environmental and Type II - Internally Excited)

MIL-STD-889 - Galvanic Compatibility of Electrically Conductive Materials

MIL-STD-1399-300-1 - Low Voltage Electric Power, Alternating Current

MIL-STD-1474 - Noise Limits

MIL-STD-2142 - Magnetic Silencing Characteristics, Measurement of (Metric)

(Copies of these documents are available online at https://quicksearch.dla.mil.)

2.2.2 Other Government documents, drawings, and publications. The following other Government documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.

NAVAL SEA SYSTEMS COMMAND (NAVSEA) PUBLICATIONS

S9074-AR-GIB-010/278 - Requirements for Fabrication Welding and Inspection, and Casting

Inspection and Repair for Machinery, Piping, and Pressure Vessels

Source: https://assist.dla.mil -- Downloaded: 2026-03-18T05:15Z

T9070-AL-DPC-020/077-2 - NAVSEA Hazardous Material Avoidance Process

(Copies of these documents are available online via Technical Data Management Information System (TDMIS) at https://mercury.tdmis.navy.mil/ by searching for the document number without the suffix. Refer questions, inquiries, or problems to: DSN 296-0669, Commercial (805) 228-0669. These documents are available for ordering

(hard copy) via the Naval Logistics Library (NLL) at https://nll.navsup.navy.mil. For questions regarding the NLL, contact the NLL Customer Service at nllhelpdesk@navy.mil, (866) 817-3130, or (215) 697-2626/DSN 442-2626.)

2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.

AEROSPACE INDUSTRIES ASSOCIATION (AIA)

NAS411-1 - Hazardous Materials Target List

(Copies of this document are available online at www.aia-aerospace.org.)

AIR MOVEMENT AND CONTROL ASSOCIATION INTERNATIONAL, INC. (AMCA)

ANSI/AMCA 300 - Reverberant Room Method for Sound Testing of Fans

(Copies of this document are available online at www.amca.org.)

AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)/AMERICAN BEARING MANUFACTURERS

ASSOCIATION (ABMA)

ANSI/ABMA 4 - Tolerance Definitions and Gauging Practices for Ball and Roller

Bearings

ANSI/ABMA 9 - Load Ratings and Fatigue Life for Ball Bearings

ANSI/ABMA 15 - Ball Bearings with Spherical Outside Surfaces and Extended Inner

Ring Width (Includes Eccentric Locking Collars)

ANSI/ABMA/ISO 3290-1 - Rolling Bearings - Balls - Part 1: Steel Balls

ANSI/ABMA/ISO 15242-4 - Rolling Bearings - Measuring Methods for Vibration - Part 4: Radial

Cylindrical Roller Bearings with Cylindrical Bore and Outside Surface

(Copies of these documents are available online at https://webstore.ansi.org.)

ASHRAE

ASHRAE 33 - Methods of Testing Forced-Circulation Air-Cooling and Air-Heating Coils

ASHRAE 37 - Methods of Testing for Rating Electrically Driven Unitary Air-Conditioning and

Heat-Pump Equipment

(Copies of these documents are available online at www.ashrae.org.)

AMERICAN WELDING SOCIETY (AWS)

AWS B2.1/B2.1M - Specification for Welding Procedure and Performance Qualification

AWS B2.2/B2.2M - Specification for Brazing Procedure and Performance Qualification

(Copies of these documents are available online at www.aws.org.)

ASTM INTERNATIONAL

ASTM A123/A123M - Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and

Steel Products

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ASTM B6 - Standard Specification for Zinc

ASTM B633 - Standard Specification for Electrodeposited Coatings of Zinc on Iron and

Steel

ASTM D6386 - Standard Practice for Preparation of Zinc (Hot-Dip Galvanized) Coated Iron and Steel Product and Hardware Surfaces for Painting

ASTM F1166 - Standard Practice for Human Engineering Design for Marine Systems, Equipment, and Facilities

(Copies of these documents are available online at www.astm.org.)

INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS (IEEE)

IEEE 45.4 - IEEE Recommended Practice for Electrical Installations on Shipboard - Marine Sectors and Mission Systems

(Copies of this document are available online at www.ieee.org.)

NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)

ANSI/NEMA MG 1 - Motors and Generators

(Copies of this document are available online at www.nema.org.)

ASSOCIATION FOR RUBBER PRODUCTS MANUFACTURERS (ARPM)

ARPM IP-20 - Specifications for Drives Using Classical V-Belts and Sheaves

ARPM IP-25 - Specifications for Drives Using Variable Speed V-Belts

(Copies of these documents are available online at https://arpminc.com.)

2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.

3. REQUIREMENTS

3.1 First article. When specified (see 6.2), a sample shall be subjected to first article inspection in accordance with 4.2.

3.2 Materials. Cast iron shall not be used in fan-coil assemblies nor shall cast iron be used in motors that are components of the fan-coil assembly. Gray cast iron may be used for the fan and motor sheaves. Materials for fan-coil assemblies shall be corrosion-resistant or material shall be protected against corrosion after fabrication.

Material degraded during the fabrication process shall be normalized to restore those properties before being assembled in any fan-coil assembly. Selected materials shall be capable of meeting all the operational and environmental requirements specified herein.

3.2.1 Corrosion protection. Corrosion-resisting steel, galvanized steel, copper, and brass referenced herein are considered corrosion-resisting materials. Corrosion-resisting steel, when fabricated by any method that tends to reduce corrosion-resisting properties, shall be normalized to restore those properties before being assembled in any unit.

3.2.1.1 Corrosion protection methods. Parts fabricated from anything other than corrosion-resisting materials shall be protected against corrosion after fabrication with chemicals, electrolytic processes, plating, or paints. The following methods, while not restrictive, are considered corrosion-protection methods when properly applied:

a. Hot-dipped galvanized in accordance with ASTM A123/A123M with the spelter in accordance with grade 5 of ASTM B6.

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b. Electroplating with zinc in accordance with type LS of ASTM B633 followed by a phosphate treatment in accordance with method A of ASTM D6386.

c. Hot phosphoric or chromic acid treatment, or a coating of primer in accordance with TT-C-490 followed by two coats of primer in accordance with TT-P-645.

3.2.2 Prohibited materials. The fan-coil unit shall not contain any chemicals categorized as “prohibited” in accordance with T9070-AL-DPC-020/077-2 for NAVSEA programs or NAS411-1 for all other programs.

Regardless of other requirements, materials and parts containing asbestos, cadmium, lithium, mercury, or radioactive material shall not be used.

3.2.3 Fasteners. Material for all bolts, nuts, studs, screws, and similar fasteners shall be corrosion-resistant passivated or of a material rendered resistant to corrosion. Sheet metal screws shall not be used. Galling shall be prevented. Tapped holes shall be reinforced where shearing of thread can occur.

3.2.4 Dissimilar metals. Fan-coil assemblies and components shall not degrade due to electrolysis in accordance with MIL-STD-889.

3.2.5 Nonmagnetic material. When nonmagnetic fan-coil assemblies are specified (see 6.2), parts shall be fabricated of nonmagnetic material, which has a maximum relative permeability of less than 2.0 after fabrication.

3.2.6 Motor material. Motor material shall be in accordance with the requirements of IEEE 45.4 or

ANSI/NEMA MG 1, as applicable, for nonmagnetic motors.

3.2.7 Recycled, recovered, environmentally preferable, or biobased materials. Recycled, recovered, environmentally preferable, or biobased 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 Paint color. The color of the fan-coil assembly shall be Light Gray, Navy Formula 111, in accordance with

MIL-DTL-15090.

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 in accordance with AWS B2.1/B2.1M and AWS B2.2/B2.2M. S9074-AR-GIB-010/278 shall be used for guidance.

3.5 Identification plates. Each fan-coil shall be provided with a permanently attached corrosion-resistant identification plate. The 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) 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 equipment shall have an operating life of 175,000 hours (continuously) except for replaceable parts such as bearings and V-belts. Replaceable parts other than the V-belts shall provide continuous operation for 35,000 hours before replacement is necessary. V-belts shall provide continuous operation for not less than 17,000 hours before replacement is necessary.

3.8 Workmanship. The fan-coil assembly shall be free from defects that affect appearance and operation. The tube sheets of the cooling coil shall not crack due to punching or forming, and fin collars shall not crack when forming tubes into collars. Fin edges of the cooling coil shall be free of burrs and shall not be bent. 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.

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3.9 Human engineering. The fan-coil assembly 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 fan-motor unit.

3.10 Maintainability. The fan-coil assembly shall be constructed so that (see 4.5.8):

a. Fan and motor are removable.

b. V-belt is removable and replaceable.

c. Fan bearings and motor bearings are removable and replaceable.

d. Air filter is removable and replaceable.

e. Belt tension and sheave diameter are adjustable.

f. Cooling coil is removable.

All of the above, except removal of the air filter, shall be accomplished by using commonly available tools and without removal of attached ducting, disassembly of the fan-coil assembly, or removal from foundation.

Quick-acting fasteners requiring no tools shall be used for removal of the air filter.

3.11 Design requirements. Each assembly shall consist of a fan and motor, a cooling coil for chilled water, and air filters mounted on and enclosed in a cabinet. The cabinet shall be equipped with thermal insulation and treated for noise attenuation and shall be constructed for deck mounting. The upper portion of the cabinet shall be able to enable connection to supply and return ducts. The cabinet shall also have connections for a power source, drainage, and chilled water supply and return.

3.11.1 Size. The size of fan-coil assemblies shall be limited to those listed in 1.2.2.

3.11.2 Cooling coil. A chilled water coil shall be provided having nonferrous tubes, fins, and headers due to the exposure to saltwater environments. The face area of the cooling coil for each size assembly shall be not less than that shown on figure 1. The cooling coil shall be at least six rows deep in the direction of airflow. The tubes shall have a minimum wall thickness of 0.025 inch throughout the tube. The fins shall be not less than 0.010 inch thick and shall be uniformly spaced. The number of fins per linear inch of tube shall be not less than 7 or more than

12. Coil design shall be such as to prevent wear and breakage caused by shipboard vibration or expansion and contraction of tubes. The chilled water supply and return connections shall be on the same end of the coil and shall be fitted with union connections capable of test pressure of 300 pound per square inch gauge.

3.11.2.1 Cooling coil vent and drain. The cooling coil shall be provided with means for venting and draining the coil. The vent shall be accessible and shall drain to the internal drain pan. Draining the coil shall be completed by means other than breaking the chilled water union connections.

3.11.3 Air filters. Air filters shall be provided for filtering all air entering the assembly. The air filters shall be in accordance with MIL-PRF-16552. Unless otherwise specified (see 6.2), air filters shall be removable through the front of the cabinet. Air filters shall be removable via an access panel held in the closed position by means of quick-acting fasteners requiring no tools to operate. Air filters shall be removable without requiring power to the fan-coil assembly to be secured. There shall be no danger to personnel of electrical energy or mechanical hazard when removing or installing filters.

3.11.4 Thermal insulation. All internal surfaces of the cabinet or chassis that are subject to condensation shall be provided with insulation to prevent dripping or a continuous flow of moisture under rated capacity conditions.

Insulation shall be of a non-halogenated, closed cell type and shall not produce toxic smoke when exposed to a fire.

Thermal insulation shall be in accordance with MIL-PRF-32514.

3.11.5 Acoustic insulation. Where acoustic insulation is required, it shall be such that it will satisfy both thermal and airborne noise requirements. Acoustic insulation shall not produce toxic smoke when exposed to a fire.

Acoustic insulation shall be in accordance with MIL-PRF-32514.

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3.11.6 Fan. The fan used in the assembly shall be a belt-driven centrifugal fan. Unless otherwise specified

(see 6.2), the fan shall produce an available total discharge pressure of 2 inches of water at the outlet of the fan-coil assembly at rated cubic feet per minute delivery. The fan-motor horsepower for each assembly shall not exceed that specified in table XI when total discharge pressure is 2 inches of water or less. All rotating parts of the fan shall be designed to have a factor of safety of not less than 8 based on the ultimate tensile strength of the material involved.

The bearing shall be in accordance with ANSI/ABMA 4, ANSI/ABMA 9, ANSI/ABMA 15, ANSI/ABMA/ISO 3290-1, and ANSI/ABMA/ISO 15242-4. The bearing shall be capable of being locked onto the fan shaft and provided with a means for removal and replacement. The fan shall be statically and dynamically balanced and tested after being installed in the assembly.

3.11.7 Fan drive. The fan drive shall be a multiple V-belt drive and shall include the fan pulley, matched

V-belts, and motor pulley. The V-belts, fan pulley, and motor shall be selected in accordance with ARPM IP-20 and

ARPM IP-25. The drive pulley shall be an adjustable positive locking pulley. Adjustment of the pulley shall allow for at least a 30-percent variation in fan speed. The pulleys shall be balanced. The V-belts shall be selected for at least 150 percent of motor horsepower at rated capacity conditions. A positive action single point belt adjustment device shall be provided to permit adjustment of belt tension. A locking device to prevent loosening of belt tension shall also be provided.

3.11.8 Type II fan-coil assembly. The type II fan-coil assembly shall be a three-section unit consisting of a cooling coil section, which shall be the base of the unit, a fan-motor section, which shall be on top of the cooling coil section, and the air distribution plenum 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 75 inches. The overall width and depth of each assembled unit shall be not greater than the dimensions shown on figure 1.

3.11.8.1 Cabinet. The cabinet enclosure of each section shall be constructed of a material equivalent in strength to 0.074-inch steel. The cabinet frame shall be rigid and of a strength to support and maintain alignment of the assembled parts. The cooling coil section shall be fitted with at least four reinforced pads, one at each corner of the section, for securing the assembled fan-coil assembly by bolting to a structural foundation.

3.11.8.2 Cooling coil section. The cooling coil section shall consist of a cooling coil and a condensate pan with a drain of 1-inch nominal pipe size (nps) on each end. The condensate pan shall be constructed to prevent slosh-over when the unit is tilted 15 degrees. Connection to the condensate drains shall be possible without the removal of an access panel. The cooling coil shall be serviceable through a front access panel. Provisions shall be made to permit access to and removal of the cooling coil without disassembly of the fan-coil assembly. Provisions shall be made to permit making a left-handed or right-handed assembly of the cooling coil by the installing activity after delivery.

Removable panels, if used, shall use capture-type fasteners and shall be airtight when installed. Unless otherwise specified (see 6.2), the fan-coil assembly shall be delivered with the chilled water supply and return connections of the cooling coil to the right when facing the front of the assembled fan-coil. A tapped hole shall be provided for a

⅜-inch bolt on the bottom right back of the unit for attachment of a grounding strap.

3.11.8.3 Fan-motor section. The fan-motor section shall consist of a centrifugal fan, fan drive, electric motor, fan and motor base with resilient mounts, and air filters. Provisions shall be made to permit access to and removal of the fan. Removable panels, if used, shall use captive-type fasteners and shall be airtight when installed.

Provisions shall be made to permit access to the air filters, fan drive, and the fan-motor, service and adjust the fan belts and pulley, and remove the fan pulley and the fan motor without disassembly of the fan-coil assembly.

3.11.8.4 Air distribution plenum section. The air distribution plenum section shall include a single air inlet located on top of the cabinet. Provisions shall be made in the air distribution plenum for one air outlet on the top and one on each end. The inside dimensions of the air inlet and each of the air outlets shall be as shown on figure 1.

Three options are available in the air distribution plenum section: the air inlets and outlets shall have smooth, flat surfaces for the attachment of flanged duct connections, each air outlet shall be supplied with a grille, or a cover plate shall be supplied that harmonizes with the cabinet enclosure. The grille shall be constructed to permit adjustable directional airflow in both horizontal and vertical planes. Unless otherwise specified (see 6.2), the fan-coil assembly shall be supplied with cover plates. The cover plates shall be gasketed.

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3.11.8.5 Static air pressure tap. Fan-coil assemblies shall be provided with a static air pressure tap on the downstream side of the filters for permanent mounting of a differential pressure gauge or for checking static air pressure with a portable differential pressure gauge. The tap shall consist of a gasketed brass or corrosion-resistant steel, ¼-inch tube, straight bulkhead connection with a sealing cap and protective cover for permanent mounting to the side of the cabinet.

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 gallons per minute per air conditioning ton (gal/min/ton) through the cooling coil shall be as specified in table I through table V, as applicable for ships using legacy air conditioning plants. For ships using High Efficiency Super Capacity (HES-

C) air conditioning plants, the performance of the fan-coil assembly for given airflow at specified DB and WB air temperatures entering the cabinet and a specific water temperature at a flow of 2.3 gal/min/ton through the cooling coil shall be as specified in table VI through table X, 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 ±0.5 degrees of that specified in the applicable table.

TABLE I. Size 21 performance (3.6 gal/min/ton).

Chilled water

(°F)

Entering air DB

(°F)

Entering air WB

(°F)

SCFM

400 620 3/ 760

MBH 1/ WB MBH WB MBH WB

70 2/

58.0 2/ 10.7 2/ 48.0 15.5 2/ 48.5 18.4 2/ 49.0

60.0 15.0 48.5 21.5 49.5 25.2 50.0

64.0 17.5 48.5 25.3 50.0 29.7 50.5

66.0 2/ 20.2 2/ 49.0 29.3 2/ 50.0 34.3 2/ 51.0

80 2/, 3/

62.0 2/ 15.6 2/ 48.0 22.8 2/ 49.0 27.0 2/ 49.0

67.0 3/ 21.6 48.5 31.3 3/ 50.0 36.7 51.0

70.0 25.9 49.0 37.8 50.5 44.4 51.5

72.5 2/ 29.8 2/ 49.0 43.4 2/ 51.0 51.2 2/ 51.5

100 2/

68.5 2/ 24.4 2/ 48.0 36.1 2/ 49.0 40.9 2/ 51.0

76.0 35.5 49.0 51.5 51.5 61.2 52.5

81.5 45.4 49.5 66.5 52.0 78.7 53.5

83.5 2/ 49.4 2/ 50.0 72.3 2/ 52.5 85.8 2/ 54.0

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TABLE I. Size 21 performance (3.6 gal/min/ton) - Continued.

NOTES:

1/ Thousands, Btu/h

2/ Test points

3/ 620 nominal rating point

TABLE II. Size 22 performance (3.6 gal/min/ton).

water

(°F)

Entering air DB

(°F)

Entering air WB

(°F)

SCFM

800 1035 3/ 1260

MBH 1/ WB MBH WB MBH WB

70 2/

58.0 2/ 20.6 2/ 48.5 25.7 2/ 49.0 30.1 2/ 49.0

62.0 28.7 49.0 35.1 50.0 41.0 50.5

64.0 33.7 49.5 41.6 50.0 48.3 51.0

66.0 38.9 2/ 49.5 48.2 2/ 50.5 56.1 2/ 51.0

80 2/, 3/

62.0 2/ 30.1 2/ 48.5 37.4 2/ 49.0 44.0 2/ 49.5

67.0 3/ 41.6 49.5 51.2 3/ 50.5 59.9 51.0

70.0 49.9 50.0 61.5 51.0 72.2 51.5

72.5 2/ 57.4 2/ 50.0 70.8 2/ 51.5 83.0 2/ 52.5

100 2/

68.5 2/ 47.4 2/ 49.0 56.2 2/ 51.0 67.1 2/ 51.0

76.0 68.5 50.5 84.5 52.0 99.5 53.0

81.5 87.4 51.5 108.5 53.0 128.2 54.0

83.5 2/ 95.4 2/ 51.5 117.9 2/ 53.5 138.8 2/ 55.0

NOTES:

1/ Thousands, Btu/h

3/ 1035 nominal rating point

TABLE III. Size 23 performance (3.6 gal/min/ton).

water

(°F)

Entering air DB

(°F)

Entering air WB

(°F)

SCFM

1000 1540 3/ 1880

MBH 1/ WB MBH WB MBH WB

70 2/

58.0 2/ 26.9 2/ 48.0 39.0 2/ 48.5 45.6 2/ 49.0

62.0 37.6 48.5 53.4 50.0 62.4 50.0

64.0 44.1 48.5 62.9 50.5 63.5 50.5

66.0 2/ 50.5 2/ 49.0 72.9 2/ 50.0 84.9 2/ 51.0

80 2/, 3/

62.0 2/ 38.9 2/ 48.0 56.6 2/ 48.5 66.8 2/ 49.0

67.0 3/ 54.1 48.5 77.6 3/ 50.0 90.9 51.0

70.0 64.8 49.0 92.8 50.5 109.2 51.5

72.5 2/ 74.2 2/ 49.0 107.2 2/ 51.0 125.3 2/ 52.0

100 2/

68.5 2/ 60.7 2/ 46.0 84.2 2/ 51.0 100.7 2/ 51.0

76.0 88.2 49.5 127.5 51.5 150.5 52.5

81.5 113.2 50.0 163.7 52.5 192.1 54.0

83.5 2/ 122.5 2/ 50.5 177.4 2/ 53.0 203.0 2/ 55.5

NOTES:

1/ Thousands, Btu/h

3/ 1540 nominal rating point

TABLE IV. Size 24 performance (3.6 gal/min/ton).

water

(°F)

Entering air DB

(°F)

Entering air WB

(°F)

SCFM

1500 2065 3/ 2550

MBH 1/ WB MBH WB MBH WB

70 2/

58.0 2/ 38.5 2/ 48.5 47.7 2/ 49.5 56.9 2/ 50.0

62.0 52.6 49.5 67.2 50.5 78.8 51.0

64.0 61.8 49.5 79.4 50.5 93.2 51.5

66.0 2/ 72.1 2/ 49.5 92.5 2/ 51.0 108.7 2/ 51.5

80 2/, 3/

62.0 2/ 56.8 2/ 48.5 74.1 2/ 49.0 84.1 2/ 50.5

67.0 3/ 76.9 49.5 99.8 3/ 51.0 117.7 51.5

70.0 93.0 50.0 120.7 51.5 143.1 52.0

72.5 2/ 107.6 2/ 50.0 140.0 2/ 51.5 165.0 2/ 52.5

100 2/

68.5 2/ 90.0 2/ 48.5 113.8 2/ 50.5 137.5 2/ 50.5

76.0 128.9 50.0 168.0 52.0 197.7 53.5

81.5 154.7 50.5 203.1 52.5 240.5 54.0

83.5 2/ 180.0 2/ 51.0 235.4 2/ 53.5 277.8 2/ 55.0

Source: https://assist.dla.mil -- Downloaded: 2026-03-18T05:15Z

TABLE IV. Size 24 performance (3.6 gal/min/ton) - Continued.

NOTES:

1/ Thousands, Btu/h

3/ 2065 nominal rating point

TABLE V. Size 25 performance (3.6 gal/min/ton).

water

(°F)

Entering air DB

(°F)

Entering air WB

(°F)

SCFM

2300 3080 3/ 3800

MBH 1/ WB MBH WB MBH WB

70 2/

58.0 2/ 60.0 2/ 48.5 75.8 2/ 48.5 86.1 2/ 49.5

62.0 81.5 49.5 103.0 50.0 119.4 51.0

64.0 96.5 49.5 121.6 50.5 142.3 51.0

66.0 2/ 111.4 2/ 49.5 141.5 2/ 50.5 165.0 2/ 51.5

80 2/, 3/

62.0 2/ 87.6 2/ 48.5 112.1 2/ 49.0 126.5 2/ 50.0

67.0 3/ 119.6 49.5 151.3 3/ 50.5 178.4 51.5

70.0 144.3 49.5 183.2 51.0 216.3 52.0

72.5 2/ 166.5 2/ 50.0 210.9 2/ 51.5 248.9 2/ 52.5

100 2/

68.5 2/ 138.9 2/ 48.5 170.7 2/ 50.0 206.5 2/ 50.5

76.0 199.4 50.0 252.6 51.5 300.2 53.0

81.5 255.7 50.5 327.4 52.5 388.8 54.0

83.5 2/ 277.8 2/ 51.0 354.8 2/ 53.0 420.3 2/ 54.5

NOTES:

1/ Thousands, Btu/h

3/ 3080 nominal rating point

TABLE VI. Size 21 performance (2.3 gal/min/ton).

water

(°F)

Entering air DB

(°F)

Entering air WB

(°F)

SCFM

400 620 3/ 760

MBH 1/ WB MBH WB MBH WB

70 2/

58.0 2/ 10.78 2/ 47.77 15.43 2/ 48.61 18.4 2/ 49.01

60.0 12.36 48.62 17.52 49.67 20.5 50.17

64.0 17.26 48.85 24.61 50.19 28.82 50.83

66.0 2/ 20.10 2/ 48.74 28.81 2/ 50.18 33.81 2/ 50.90

80 2/, 3/

62.0 2/ 15.74 2/ 47.58 22.77 2/ 48.71 26.89 2/ 49.26

67.0 3/ 21.34 48.79 30.67 3/ 50.3 36.06 51.08

70.0 25.81 48.75 37.25 50.43 43.88 51.30

72.5 2/ 29.74 2/ 48.76 43.06 2/ 50.57 50.8 2/ 51.51

100 2/

68.5 2/ 24.61 2/ 47.45 36.07 2/ 48.81 42.85 2/ 49.52

76.0 35.07 49.06 50.95 51.12 60.22 52.19

81.5 45.08 49.36 65.83 51.68 77.93 52.93

83.5 2/ 49.05 2/ 49.50 71.71 2/ 51.93 84.94 2/ 53.25

NOTES:

1/ Thousands, Btu/h

3/ 620 nominal rating point

TABLE VII. Size 22 performance (2.3 gal/min/ton).

water

(°F)

Entering air DB

(°F)

Entering air WB

(°F)

SCFM

800 1035 3/ 1260

MBH 1/ WB MBH WB MBH WB

70 2/

58.0 2/ 21.19 2/ 47.94 25.61 2/ 48.67 29.42 2/ 49.21

62.0 28.83 49.01 34.72 49.91 39.74 50.63

64.0 34.17 48.89 41.29 49.88 47.41 50.66

66.0 2/ 39.57 2/ 48.87 47.97 2/ 49.93 55.20 2/ 50.76

80 2/, 3/

62.0 2/ 30.68 2/ 48.01 37.35 2/ 48.91 43.13 2/ 49.70

67.0 3/ 41.97 49.04 50.94 3/ 50.22 58.66 51.13

70.0 50.53 49.10 61.56 50.37 71.10 51.35

72.5 2/ 58.05 2/ 49.21 70.88 2/ 50.51 82.00 2/ 51.60

100 2/

68.5 2/ 47.76 2/ 48.19 58.62 2/ 49.43 68.08 2/ 50.45

76.0 68.41 49.70 83.68 51.31 96.92 52.64

81.5 87.76 50.14 107.64 51.95 124.87 53.41

83.5 2/ 95.40 2/ 50.34 117.08 2/ 52.24 136.00 2/ 53.73

Source: https://assist.dla.mil -- Downloaded: 2026-03-18T05:15Z

TABLE VII. Size 22 performance (2.3 gal/min/ton) - Continued.

NOTES:

1/ Thousands, Btu/h

3/ 1035 nominal rating point

TABLE VIII. Size 23 performance (2.3 gal/min/ton).

water

(°F)

Entering air DB

(°F)

Entering air WB

(°F)

SCFM

1000 1540 3/ 1880

MBH 1/ WB MBH WB MBH WB

70 2/

58.0 2/ 27.21 2/ 47.62 38.69 2/ 48.50 45.29 2/ 48.94

62.0 36.97 48.65 52.17 49.88 60.76 50.45

64.0 43.73 48.55 62.01 49.88 72.34 50.52

66.0 2/ 50.68 2/ 48.48 72.17 2/ 49.91 84.39 2/ 50.61

80 2/, 3/

62.0 2/ 39.39 2/ 47.60 56.53 2/ 48.70 66.41 2/ 49.24

67.0 3/ 53.67 48.61 76.52 3/ 50.14 89.59 50.89

70.0 64.68 48.60 92.73 50.26 108.71 51.11

72.5 2/ 74.26 2/ 48.68 106.77 2/ 50.46 125.42 2/ 51.37

100 2/

68.5 2/ 61.14 2/ 47.57 88.74 2/ 49.03 104.85 2/ 49.78

76.0 87.37 49.11 125.96 51.14 148.10 52.25

81.5 112.03 49.48 162.06 51.82 190.81 53.05

83.5 2/ 121.74 2/ 49.67 176.30 2/ 52.12 207.73 2/ 53.41

NOTES:

1/ Thousands, Btu/h

3/ 1540 nominal rating point

TABLE IX. Size 24 performance (2.3 gal/min/ton).

water

(°F)

Entering air DB

(°F)

Entering air WB

(°F)

SCFM

1500 2065 3/ 2550

MBH 1/ WB MBH WB MBH WB

70 2/

58.0 2/ 38.69 2/ 48.24 49.95 2/ 48.88 58.80 2/ 49.35

62.0 52.28 49.52 66.91 50.45 78.21 51.05

64.0 62.07 49.48 79.74 50.51 93.33 51.21

66.0 2/ 72.15 2/ 49.48 93.01 2/ 50.59 109.26 2/ 51.35

80 2/, 3/

62.0 2/ 56.39 2/ 48.33 73.23 2/ 49.18 86.59 2/ 49.80

67.0 3/ 76.51 49.64 98.77 3/ 50.82 116.13 51.70

70.0 92.54 49.72 119.85 51.04 141.18 52.02

72.5 2/ 106.57 2/ 49.86 138.29 2/ 51.29 163.19 2/ 52.34

100 2/

68.5 2/ 88.36 2/ 48.52 115.68 2/ 49.69 137.56 2/ 50.53

76.0 125.69 50.43 163.43 52.14 193.06 53.30

81.5 161.59 50.98 210.69 52.91 249.28 54.32

83.5 2/ 175.75 2/ 51.24 229.35 2/ 53.26 271.53 2/ 54.74

NOTES:

1/ Thousands, Btu/h

3/ 2065 nominal rating point

TABLE X. Size 25 performance (2.3 gal/min/ton).

water

(°F)

Entering air DB

(°F)

Entering air WB

(°F)

SCFM

2300 3080 3/ 3800

MBH 1/ WB MBH WB MBH WB

70 2/

58.0 2/ 58.10 2/ 48.48 73.34 2/ 49.06 86.39 2/ 49.53

62.0 77.75 49.99 97.23 50.84 113.40 51.49

64.0 92.55 50.02 116.13 50.97 135.76 51.70

66.0 2/ 108.45 2/ 49.98 136.46 2/ 51.02 159.98 2/ 51.82

80 2/, 3/

62.0 2/ 85.94 2/ 48.41 109.22 2/ 49.23 129.12 2/ 49.83

67.0 3/ 115.84 49.99 146.07 3/ 51.09 171.54 51.96

70.0 140.53 50.11 177.78 51.37 209.18 52.33

72.5 2/ 162.55 2/ 50.20 206.18 2/ 51.56 243.03 2/ 52.63

100 2/

68.5 2/ 136.24 2/ 48.36 174.57 2/ 49.41 207.90 2/ 50.24

76.0 192.40 50.66 244.67 52.19 289.03 53.41

81.5 248.44 51.16 316.96 52.94 375.01 54.38

83.5 2/ 270.64 2/ 51.38 345.54 2/ 53.26 409.03 2/ 54.79

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TABLE X. Size 25 performance (2.3 gal/min/ton) - Continued.

NOTES:

1/ Thousands, Btu/h

3/ 3080 nominal rating point

3.12.1 Nominal capacity rating.

3.12.1.1 Nominal capacity rating for 45 °F water. The nominal capacity rating of the fan-coil assembly cooling coil shall be at least equal to that specified in table XI, 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 ±5 percent of the rated airflow specified in table XI. The water flow through the coil shall be within ±5 percent of the rated water flow specified in table XI.

TABLE XI. Capacity rating (nominal) 45 °F water.

Fan-coil assembly

Cooling coil air and water flow for rated capacity Fan

External static pressure, type III units only

Sizes Capacity

(Btu/h)

Air

(SCFM 1/)

Water

(gal/min 2/)

Motor horsepower (max)

External static pressure

(inches of w.g. 3/)

21 31,300 620 9 1½ 2

22 51,200 1035 16 3 2

23 77,600 1540 23 5 2

24 99,800 2065 31 5 2

25 151,300 3080 44 7½ 2

NOTES:

1/ Standard Cubic Feet per Minute

2/ Gallons per Minute

3/ Water Gage

3.12.1.2 Nominal capacity rating for 43 °F water. The nominal capacity rating of the fan-coil assembly cooling coil shall be at least equal to that specified in table XII, 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 43 °F.

The airflow at the cabinet outlet shall be within ±5 percent of the rated airflow specified in table XII. The water flow through the coil shall be within ±5 percent of the rated water flow specified in table XII.

TABLE XII. Capacity rating (nominal) 43 °F water.

assembly

Cooling coil air and water flow for rated capacity Fan

External static pressure, type III units only

Sizes Capacity

(Btu/h)

Air

(SCFM)

Water

(gal/min)

Motor horsepower (max)

External static pressure

(inches of w.g.)

21 30,670 620 9 1½ 2

22 50,940 1035 16 3 2

23 76,520 1540 23 5 2

24 98,770 2065 31 5 2

25 146,070 3080 44 7½ 2

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. Electric motors shall operate on 440-volt, three-phase, 60-hertz power with the characteristics specified in MIL-STD-1399-300-1.

3.12.3.2 Ambient temperature. All electrical components shall be designed for continuous operation in a maximum of 122 °F ambient temperature.

3.12.3.3 Electrical motors. Motors for fan-coil assemblies shall be in accordance with IEEE 45.4. Motors specified to be grade A shock qualified (see 6.2.i) shall be continuous duty H.I. shock qualified in accordance with

MIL-DTL-901. Motors for use in non-H.I.-shock fan-coil assemblies (type X) shall be commercial marine motors in accordance with IEEE 45.4. Maximum horsepower shall not exceed the values shown in table XI.

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.

3.13 Environmental conditions.

3.13.1 Shock. Unless otherwise specified (see 6.2), fan-coil assemblies shall be able to withstand electrically and mechanically the H.I. shock tests specified in 4.5.1. Internal shock and vibration mounts shall be provided in conjunction with the mounting arrangement for the fan and motor assembly. The mounts shall be the captive type.

3.13.2 Vibration. Unless otherwise specified (see 6.2), fan-coil assemblies shall withstand environmental vibrations without damage or malfunction as specified in 4.5.2 in accordance with MIL-STD-167-1 for type I environmental vibration for frequencies up to and including 33 hertz.

3.13.3 Airborne noise. Airborne noise for a type II or a type III fan-coil assembly shall meet the requirements for shipboard equipment in accordance with MIL-STD-1474 when tested with the procedures defined in 4.5.4.

3.13.4 Replenishment air. Replenishment air introduced into the unit shall be sea air at 40 to 95 °F.

3.13.5 Ambient air. Fan-coil assemblies shall perform in accordance with the requirements herein under ambient temperatures between 40 °F and 95 °F.

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).

Source: https://assist.dla.mil -- Downloaded: 2026-03-18T05:15Z

4.2 First article inspection. First article inspection shall be performed on each size fan-coil assembly when a first article sample is required (see 3.1). This inspection shall include the examination of 4.4 and the tests specified in table XIII.

TABLE XIII. First article and conformance inspections.

Applicability of test to fan-coil assembly

Tests Requirement Verification First article Conformance

Shock 3.13.1 4.5.1 H.I. shock -----

Vibration 3.13.2 4.5.2 X -----

Performance 3.12 and 3.12.1 4.5.3 X -----

Airborne noise 3.13.3 4.5.4 X -----

Nonmagnetic material

3.2.5 4.5.5

Only nonmagnetic units

Motor 3.12.3.1 4.5.6 X X

Leakage 3.11.2 4.5.7 X X

Maintainability 3.10 4.5.8 X -----

Prohibited materials 3.2.2 4.5.9 X X

4.3 Conformance inspection. Conformance inspection shall include the examination of 4.4 and the tests specified in table XIII.

4.4 Examination. Each fan-coil assembly shall be examined for compliance with those requirements not verified via the tests in 4.5.1 through 4.5.8. This element of inspection shall encompass all visual examinations and dimensional measurements. Any redesign or modification of the contractor’s standard product to comply with the specified requirements, or any necessary redesign or modification following failure to meet the specified requirements shall undergo further inspection. Non-compliance with any specified requirements or presence of one or more defects preventing or lessening maximum efficiency shall constitute cause for rejection.

4.5 Tests. Tests shall be conducted in accordance with 4.5.1 through 4.5.8.

4.5.1 Shock test. When specified (see 6.2), the fan-coil assembly shall be shock tested on the medium-weight machine as specified for grade A shock in accordance with MIL-DTL-901. The fan-coil assembly shall be operated at rated voltage and current, rated airflow, and a hydrostatic pressure of at least 100 pounds per square inch gauge shall be maintained on the cooling coil of the unit during the shock tests. Evidence of fragmentation or missile effect of parts, deformation that will cause active interference between parts, failure to operate, or leakage of the cooling coil shall be cause for rejection.

4.5.2 Vibration tests. When specified (see 6.2), the fan-coil assembly shall be subjected to type I vibration tests in accordance with MIL-STD-167-1. The exploratory vibration test specified in MIL-STD-167-1 shall include frequencies up to and including 33 hertz at the table amplitude specified therein. The rotating components of the fan-coil units shall meet the balance requirements specified in MIL-STD-167-1 for type II vibration. Any unit that fails to meet any requirement shall be rejected.

4.5.3 Performance tests. Performance tests shall be as specified in 4.5.3.1 through 4.5.3.3.

Source: https://assist.dla.mil -- Downloaded: 2026-03-18T05:15Z

4.5.3.1 Capacity tests. The capacity of each type and size of fan-coil assembly shall be determined by the conditions specified in 3.12.1.1 at 45 °F and 3.12.1.2 at 43 °F chilled water temperature for the note 2 points in table I through table V for 45 °F chilled water and table VI through table X for 43 °F chilled water. 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.

4.5.3.2 Flexibility and range tests. The leaving WB temperature and capacity (Btu/hr) for each type and size of fan-coil assembly shall be determined by the conditions specified in 3.11.6 and 4.5.3.1. Airflow measurement and cooling coil tests shall be conducted as specified in 4.5.3.1. At least one test shall be conducted with the unit inclined 15 degrees from the normal vertical position in any direction.

4.5.3.3 Limitation tests. The maximum acceptable operating limits (see table I through table X) of each type and size of fan-coil assembly shall be established without exceeding the total sound power levels specified by the table XIV limitations and without carryover of cooling coil condensate.

TABLE XIV. Total sound power level (dB referenced to 10-12 watts).

Octave band center frequency (Hz)

Size 63 125 250 500 1,000 2,000 4,000 8,000

21 77 74 71 68 65 62 59 56

22 80 77 74 71 68 65 62 59

23 83 80 78 74 71 68 65 62

24 86 83 80 77 74 71 68 65

25 89 86 83 80 77 74 71 68

NOTE: All total sound power levels are in accordance with MIL-STD-1474.

4.5.4 Airborne noise. Airborne noise shall be verified in accordance with the testing procedures of

MIL-STD-1474. The fan-coil assembly shall be operated at a fan speed providing nominal airflow delivery conditions for the size of unit under test (see table I through table V herein), based upon internal pressure drop and fan performance curves. For a type III fan-coil assembly, an external static pressure of 2 inches of water gauge 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 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.

4.5.4.1 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 ANSI/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.

Source: https://assist.dla.mil -- Downloaded: 2026-03-18T05:15Z

4.5.4.2 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 ANSI/AMCA 300 or

ANSI/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 that does not produce excessive flow-induced noise. When a discharge duct is installed to achieve an external static pressure of 2 inches of water gauge, 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 the 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 foot beyond the rear vertical edge of the casing of the fan-coil assembly. No portion of the duct shall extend more than 2.5 feet 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 the outlet air opening shall be maintained.

4.5.5 Permeability tests. A permeability test of nonmagnetic material use in construction of the fan-coil assembly shall be conducted in accordance with MIL-STD-2142, Test 501 (see 3.2.5).

4.5.6 Motor tests.

a. The insulation resistance test and the dielectric strength test shall be conducted in accordance with

IEEE 45.4.

b. The fan-motor of each fan-coil assembly shall be tested at rated voltage and current to determine whether the fan and motor will operate. Any fan-coil assembly in which the motor or the fan and motor fails to operate shall be rejected.

4.5.7 Leakage test. The cooling coil of each fan-coil assembly shall be tested at a hydrostatic or pneumatic pressure of at least 300 pounds per square inch gauge. When tested, there shall be no cooling coil leakage in the fan-coil assembly.

4.5.8 Maintainability demonstration. The first production unit shall be examined after testing, and the capability to maintain, disassemble, and repair the unit shall be demonstrated. The demonstration shall be conducted utilizing the recommended tools and with personnel other than expert mechanics. Evidence that maintainability of the fan-coil assembly cannot be accomplished by personnel other than expert mechanics shall be cause for failure of the demonstration. The maintainability demonstration shall include, but not be limited to, the following:

a. Replacement of fan bearing.

b. Replacement of V-belts.

c. Replacement of fan-motor.

d. Replacement of motor bearing.

e. Removal of air filters for servicing and replacement.

f. Adjustment and locking of adjustable motor sheave.

g. Replacement of cooling coil.

h. Servicing of cooling coil.

4.5.9 Prohibited materials. Prohibited materials shall be verified as specified (see 3.2.2 and 6.2).

5. PACKAGING

5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or order (see 6.2). When packaging of materiel is to be performed by DoD or in-house contractor personnel, these personnel need to contact the responsible packaging activity to ascertain packaging requirements. Packaging requirements are maintained by the Inventory Control Point’s packaging activities within the Military Service or

Defense Agency, or within the military service’s system commands. Packaging data retrieval is available from the managing Military Department’s or Defense Agency’s automated packaging files, CD-ROM products, or by contacting the responsible packaging activity.

Source: https://assist.dla.mil -- Downloaded: 2026-03-18T05:15Z

6. NOTES

(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)

6.1 Intended use. The fan-coil assembly is intended for use in lieu of a fan room with a built-up system on board. It is designed for ready connection to a chilled water system, a drainage system, an air distribution system, and a power source. The belt drive for the centrifugal fan is intended to permit selection of capacity to fit application depending on the use or extent of ductwork required. The adjustable motor pulley is specified to permit ready selection of fan speed to fit specific application. Type II fan-coil assemblies should be specified when no duct sections are to be attached to the unit when it is placed in service.