Chapter 1. INTRODUCTION - TM-5-4120-285-150039

CHAPTER 1

INTRODUCTION

Section I. GENERAL

1-1. Scope

list of basic issue items authorized the operator

a. This manual is published for the use of per-

of this equipment. Appendix C contains the main-

sonnel to who the Military Models

tenance allocation chart. The organizational, di-

MAC6V20-4920-05 (hereinafter designated as

rect support, general support, and depot mainte-

6V20) and the MAC4V20-4950-03 (hereinafter

nance repair parts and special tools are listed and

designated as 4V20) are issued. Chapters 1

illustrated in TM 5412028525P.

through 3 provide information on installation,

c. Reports of errors, omissions, and recommen-

operation, preventive maintenance, and opera-

dations for improving this publication by the in-

tor's and organizational maintenance of the

dividual user is encouraged. Reports should be

equipment, accessories, components, and attach-

submitted on DA Form 2028 (Recommended

ments. Chapter 4 provides information on ship-

Changes to DA Publications) and forwarded di-

ment, and limited storage, and demolition of the

rect to Commanding General, U.S. Army Mobility

equipment. Chapters 5 and 6 provide instructions

Equipment Command, A T T N , AMSME-MPP,

for direct support, general support, and depot

4300 Goodfellow Boulevard, St. Louis, Mo. 63120.

maintenance. Also included are descriptions of

1-2. Forms and Records

main units and their relationship to other compo-

nents.

DA Forms and procedures used for equipment

b. Appendix A contains a list of publications

maintenance will be only those prescribed in TM

applicable to this manual. Appendix B contains a

38750 (Army Equipment Record Procedures).

Section Il. DESCRIPTION AND DATA

1-3. Description

c. Evaporator Section. The evaporator section,

located in the upper compartment, contains an

a. General. The air conditioners (fig. 11 and

evaporator coil, evaporator coil drain pan, expan-

12) are used primarily in van type enclosures

sion valves, evaporator heaters, and the sight

for providing filtered, conditioned, or heated air

glass.

as required to maintain the service conditions

necessary for the efficient operation of electronic

1-4. Identification and Tabulated Data

equipment and the comfort of operating person-

a. Identification.

nel housed within the specified vans. The units

(1) Manufacturers identification plate. Lo-

are completely self-contained, air cooled, electric

cated on the upper rear panel. Specifies the model

motor driven and designed for continuous opera-

number, serial number, and the manufacturer.

t i o n under varying loads. These units are

(2) Compressor identification plate. Located

equipped with internal ducting to the low side of

on the front of the compressor housing. Specifies

the evaporator fan so that ventilation air from a

the compressor model number, part number, re-

chemical-biological filter may be supplied by the

frigerant oil type, capacity, electrical data, and

fan. The units furnish 12,000 BTUH for heating

manufacturer.

and 18,000 BTUH for cooling.

(3) DA identification plate. Located on the

b. Condenser Fan. The condensing section, lo-

upper rear panel. Specifies the nomenclature,

cated in the lower compartments, contains the

model number, part number, and manufacturer.

hermetically sealed compressor, condenser coil,

control panel and box, thermostatic switch,

(4) Blower motor identifi.cation plate. Lo-

cated on top of the blower motor housing. Speci-

blower motor, and service valves.

1-1