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

2.7.2 Vibration. The heaters shall start and operate while vibrating at an amplitude of 0.25 inch for one hour in the direction of each of the three major axes of the heater. While accelerating and decelerating at a uniform rate for an interval of one minute, the frequency shall vary through a range of 10 to 55 cycles per second. There shall be no evidence of leakage of fuel from the type I heaters, or of coolant from the type II heaters during or after the vibration.

2.7.3 Corrosion resistance. With all duct openings sealed, the heaters shall show no evidence of corrosion that would affect their functioning after being subjected to a 96-hour salt solution spray.

2.7.4 Electromagnetic interference. Unless otherwise specified (see 6.2) or in applicable drawings, the heaters shall meet the electromagnetic interference requirements of products offered commercially.

2.8 Identification and markings. Identification and markings shall be permanent and legible and shall include as a minimum, the manufacturer's identification code (CAGE), the engineering drawing part number (type I heaters) and PIN AA52545-1 (type II heater).

2.9 Nameplate. A nameplate shall be attached to the heater in a location, such that the plate may be easily read when the heater is installed in the vehicle. The location of the nameplate shall be as specified in the contract or ordering data (see 6.2). The nameplate shall contain the following minimum information:

HEATER 28 VOLTS DC

ENGINEERING DRAWING PART NUMBER (TYPE I HEATERS)

PIN AA52545-1 (TYPE II HEATERS)

MANUFACTURER'S IDENTIFICATION

MANUFACTURER'S SERIAL NUMBER

2.10 Painting. The exterior surfaces of the type I heater case and outlet adapter shall be cleaned, degreased, and then painted with paint heat tested to 400°F. Other surfaces of the type I heater, and the exterior surfaces of the type II heater shall be finished as specified in the contract (see 6.2).