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CHAPTER 1
INTRODUCTION
Section I. GENERAL
1-1. Scope
This manual is published for the use of personnel
to whom the compact air conditioner is issued.
Chapters 1 through 3 provide information on in-
stallation, operation, preventive maintenance, and
operator’s and organizational maintenance of the
equipment, accessories, components, and attach-
ments. Chapter 4 provides information on ship-
ment and limited storage, and demolition of the
equipment. Chapters 5 and 6 provide instruction
for direct support and general support. Also in-
cluded are descriptions of main units and their
relationships to other components.
1-2. Forms and Records
a. DA Forms and procedures used for equip-
ment maintenance will be only those prescribed
in TM 88-750 (Army Equipment Record Proce-
dures).
b. Report of errors, omissions, and recommen-
dations for improving this publication by the in-
dividual user is encouraged. Reports should be
submitted on DA Form 2028 (Recommended
Changes to Publications) and forwarded direct to
Commanding General, U.S. Army Mobility
Equipment Command, ATTN: AMSME-MPP,
4300 Goodfellow Boulevard, St. Louis, Mo. 63120.
Section II. DESCRIPTION AND DATA
1-3. Description
a. General. These air conditions (fig. 1-1 and
1-2) are used primarilyi in van-type enclosures.
The units provide filtered, conditioned, or heated
air, as required, to maintain the service condi-
tions necessary for the efficient operation of elec-
tronic equipment in the vans. The conditioners
also provide for the comfort of operating person-
nel housed within specified vans. The units are
completely self-contained, air-cooled, electric
motor driven, and designed for continuous opera-
tion under varying loads. These units are
equipped with internal ducting to the low side of
the evaporator fan so that ventilation air from a
chemical-biological filter may be supplied by the
fan. The units furnish 12,000 BTUH for heating
and 18,000 BTUH for cooling.
b. Condenser Section. The condenser section,
located in the lower compartments, contains the
hermetically sealed compressor, condenser coil,
control panel and box, thermostatic switch,
blower motor, service valves, and condenser fan.
c. Evaporator Section. The evaporator section,
located in the upper compartment contains an
evaporator coil drain pan, expansion valves,
electrical heaters, sight glass, and evaporator
fan.
1-4. Identification and Tabulated Data
a. Identification.
(1) Air Conditioner (Model CH420-1 ).
(a) Corps of Engineers plate A. Located
near’ top of back panel. Specifies nomenclature,
manufacturer, model number, serial number, di-
mensions, weight and capacity.
(b) Manufacturers identification plate.
Located on rear panel just below sight glass.
Specifies nomenclature, manufacturer, model”
number, serial number of the unit.
(c) Compressor identification plate. Lo-
cated on front of compressor housing. Specifies
compressor model number, part number, serial
number, refrigerant, oil type and capacity manu-
facturer, and complete electrical data.
(2) Air conditioner (Model CH-620-1 ).
(a) Corp of Engineers plate A. Located
above fan guard on back panel of unit. Specifies
nomenclature, manufacturer, model number, se-
rial number, dimensions, weight, and
(b) Compressor identification
capacity.
plate. Lo-
1-1
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