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TM 5-4120-270-15
Section III. CONTROLS AND INSTRUMENTS
2-8.
General
This section describes, locates, illustrates, and furnishes
the
operator,
crew
or
organizational
maintenance
personnel sufficient information about the various
controls and instruments for proper operation of the air
conditioner.
2-9.
Controls and Instruments
a.
General. The controls and instruments on
the air conditioner are illustrated on figure 2-2.
b.
High Pressure Cutout Control. The high
pressure cutout located at the rear of the unit (fig. 2-2) is
designed to sense discharge line pressure at the
compressor and will cutout at 445 poig (pounds per
square inch gage). When discharge
line pressure has reduced to 400 psig, the high pressure
cutout control can be reset by pushing the reset button.
c.
Low Pressure Cutout Control. The low
pressure cutout located at the rear of the unit (fig. 2-2) is
designed
to
sense
suction
line
pressure
at
the
compressor and will cutout at 7 peig. When suction line
pressure has increased above this limit, the low pressure
cutout control can be reset by pushing the reset button.
d.
Liquid Line Sight Glass. The sight glass
(fig. 22) indicates dryness of the system. Moisture in the
refrigerant is shown by the indicator turning from green
to yellow. A shortage of refrigerant is indicated by
bubbles in the sight glass.
2-3
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