Section III. Technical Principles of Operation

TM 5-4120-356-14

CONDENSER FAN (1). The condenser fan draws

ambient air from the outside. The air flows

o v e r the condenser coil and is exhausted to

the outside.

CONDENSER COIL (2). Air drawn through the

condenser coil by the condenser fan cools

the refrigerant inside the condenser coil.

TS5-4120-356-14/14

F i g u r e 1-4. Left rear three-quarter view, location and description of

major components

S e c t i o n III. Technical Principles of Operation

PRINCIPLES OF OPERATION

1-13.

a. General. The air conditioner is a fully self-contained unit capable of

providing cooling, heating or ventilation to the conditioned area.

Cooling.

(1) The cooling section consists primarily of compressor, high and

low pressure cut-out switches, condenser coil, evaporator coil, and a fan motor

which operates both a condenser fan and an evaporator fan. When the selector switch

is placed in the "COOL" position, the fan motor and the compressor start. The cool-

ing section is under the control of the thermostat, which serves to maintain the

temperature of the conditioned area at the desired level.

(2) The compressor is a motor driven unit which is used to pump refrig-

erant through the system. T h e h i g h p r e s s u r e c u t - o u t s w i t c h s t o p s t h e u n i t i f t h e

c o m p r e s s o r d i s c h a r g e p r e s s u r e r i s e s a b o v e 4 6 0 p s i g ( 3 2 . 3 k s / c m2 ) .

( 3 ) The refrigerant, in a gaseous vapor state, is pumped by the com-

pressor to the condenser coil. As the refrigerant flows through the condenser coil,

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