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PRINCIPLES OF OPERATION - TM-10-3930-673-340542
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TM-10-3930-673-34 All Terrain Lifter Army System (ATLAS) 10 000 lb Capacity Manual
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High Pressure and Low Pressure Switches
TM 10-3930-673-34
d. Receiver Drier. The high pressure liquid
refrigerant moves from the condenser coil to the
receiver drier, where the refrigerant is stored and
filtered. Moisture is the major enemy of the air
conditioning system, and desiccant inside the
receiver drier will absorb only a small amount. The
container of desiccant inside the receiver drier may
break open and contaminate the system if any
attempt is made to dry the desiccant, or if more
moisture is inside the system than the desiccant can
absorb. Every effort should be made to remove all
moisture from the system and install a new receiver
drier if its condition is questionable. Installation of
a new receiver drier is recommended is necessary
TR01380
each time any part of the refrigeration system is
open to the atmosphere.
e. Expansion Valve. The expansion valve is
installed in the air conditioning system to lower
pressure before the refrigerant enters the
evaporator coil. This reduction in pressure is done
by passing the refrigerant through a small orifice.
TR01382
f. Evaporator Coil. The evaporator coil is the low
pressure component where liquid refrigerant
absorbs heat from surrounding air. The expansion
valve bleeds high pressure refrigerant into the low
pressure evaporator coil. The refrigerant expands
rapidly in the evaporator coil and its temperature is
quickly reduced. The refrigerant absorbs heat from
the air when the blower fan circulates air over the
evaporator coil fins. The exchange of heat from the
air to the refrigerant depends upon the difference in
temperature. During high heat load, such as usually
encountered when the system is first turned on, the
temperature difference is great and the refrigerant
will absorb heat quickly. The fan blower can be set
at its highest setting to circulate large quantities of
warm air around the evaporator coil. After the cab
TR01383
has been cooled, the fan speed should be reduced so
that already cool air will have longer time to yield to
the refrigerant as it passes the evaporator coil.
15-3

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