A-A-52545 Heaters, Vehicular Compartment 28 Volt, DcThis CID covers two types of heaters of 28 volt (V) direct current (dc) nominal rating, used for heating crew and engine compartments of military vehicles or equipment. Type I heaters are intended for use on military vehicles or equipment which may be required to operate in an ambient temperature to minus 65 degrees Fahrenheit (-65 Degrees F); from which a supply of gasoline is available; when heated air is required without the vehicle engine being operated. Type II heaters are intended for use on military vehicles or equipment from which a supply of heated circulating liquid (engine coolant) is available, which may be required to operate in an ambient temperature to -25 Degrees F.

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A-A-52545B

2. SALIENT CHARACTERISTICS

2.1 Materials. Materials for type I heaters shall be as specified in the applicable engineering drawing (AED). Materials for type II heaters shall be in accordance with the manufacturer's material specifications for heaters. The use of recovered material made in compliance with regulatory requirements is acceptable providing all requirements of this CID are met (see 4.1).

2.2 Design and construction. Unless otherwise specified, type I heaters shall fall within the envelope outline of the AED and shall conform to the detail requirements for mounting dimensions, external electrical connections and fuel inlet. Type II heaters shall be constructed in accordance with figures 1, 2, and 3. Type I and type II heaters shall meet the applicable requirements of Federal Motor Carrier Safety Regulations (FMCSR) in effect on date of manufacture.

2.2.1 Interchangeability. All parts having the same manufacturer's or Army part numbers shall be completely interchangeable with each other with respect to installation and performance.

2.3 Controls. When specified (see 6.2), heaters shall be furnished complete with controls to start, stop, and operate heaters.

2.4 Coolants. Type II heaters shall perform as specified herein using the following type coolants/rust inhibitors:

a. Water and 60% concentration of antifreeze compound conforming to A-A-52624.

b. Arctic type antifreeze compound of a single phase homogeneous mixture. This compound shall provide protection against freezing in regions where the ambient temperature remains close to -40°F for extended periods of time, but may drop to as low as -90°F.

c. Water and corrosion inhibiting compound consisting of the chemical composition shown in table I.