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TM 9-4120-389-14
CHAPTER 2
OPERATING INSTRUCTIONS
SECTION I DESCRIPTION AND USE OF OPERATOR'S
CONTROLS AND INDICATORS
2-1. GENERAL.
The Model 3864 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 or used with 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 or system manual for instructions peculiar
to your specific installation.
2-2. OPERATOR'S CONTROLS.
See figures 2-1 and 2-2 for a general description of the controls that an operator will normally be concerned
with. For specific operating instructions, see Sections III and IV of this chapter.
2-3. INDICATORS.
The refrigerant sight glass is the only visual indicator used on the Model 3864 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 COOL
mode. The unit must be operated 15 minutes in maximum cooling prior to checking condition of refrigerant at
sight glass. 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.
2-1
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