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TM9 4120-423-14&P
DESCRIPTION AND USE OF OPERATOR'S CONTROLS AND INDICATORS
GENERAL
The Air Conditioner is designed for a variety of installations and for operation under a wide range of
climatic conditions. It is also designed for continuous or intermittent operation as a self-contained unit
or may be connected to external filtering equipment for operation under chemical-biological-
radiological (CBR) environmental conditions.  Operators must be aware of any peculiarities or
operational limitations for their specific installation. See the appropriate shelter manual for instructions
peculiar to your specific installation.
NOTE
Refer to other procedures in further detail in WP0006
Operator's Controls and Indicators
Key
Control or Indicator
Function
1
High Pressure Cutout Reset
Press to Reset
2
Temperature Control
Turn knob to adjust level of cooling or heating, clockwise for
warmer, counterclockwise for cooler.
3
Run Indicator Light
Lights in COOL, LOW HEAT, or HIGH HEAT modes. Will also
light when pressed in OFF mode (bulb must be good)
4
Mode Selector Switch
Turn switch to COOL for cooling or LOW HEAT or HIGH HEAT
for heating. Turn switch OFF to shut unit down.
5
Time Totalizing Meter
Indicates total elapsed operating time in hours and tenths.
6
Sight Glass (refrigerant)
A port or window through which the refrigerant condition can be
seen.
The run indicator light, the time totalizing meter, and the refrigerant sight glass are the only visual
indicators incorporated in the Model HSP24C30H Air Conditioner.
The sight glass is a port or window through which the refrigerant condition can be seen. Liquid
refrigerant actually flows through the sight glass chamber only during cooling cycles when the air
conditioner is in operation in the COOL mode. The sight glass is equipped with a center indicator that is
moisture sensitive. Dry refrigerant is indicated by green. It turns to chartreuse when the moisture
content becomes undesirable, and to yellow when the level becomes unacceptable. Excessive moisture
in the refrigerant may damage or possibly destroy the compressor. If the liquid refrigerant observed in
the sight glass has an opaque, milky appearance, or frequent bubbles appear, the volume of refrigerant is
low and the system should be charged. Either moisture or low charge indications should be reported to
direct support maintenance.
0005 00-1

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