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 TM 55-1905-219-14-8
4-28.
AIR CONDITIONING SYSTEM-MAINTENANCE INSTRUCTIONS.
OVERVIEW
The following is an index to this paragraph:
DESCRIPTION
PARAGRAPH
General Description
Principles of Operation
Characteristics of Refrigerant-12
Safety Precautions
Operating Procedures
Refrigerant Charge
Compresser Lubrication
Capacity Control System
Thermal Expansion Valves
Solenoid Valves
Water Regulating Valves
High and Low Pressure Control Switches
Temperature Control Switches (Thermostats)
Water Pressure Failure Control Switch
Pressure and Leak Test
Evacuation and Dehydration
Opening System
Refrigerant Charge and Leaks
General Compressor Maintenance
Torque Values
Wear Limits
Service Tools
a.
General Description.
(1) The air conditioning equipment consists of (1) condensing unit assembly, (1) heat interchanger, (1)
air conditioning cooling coil, and gage board.
(2) The condensing unit assembly is designed for automatic operation to supply liquid refrigerant-12 to
the direct expansion cooling coil. The condenser has an operating capacity of 8 tons at 40 F (40 ) suction
C
temperature and 105 F (40.6 ) condensing temperature, and requires a refrigerant-12 charge of
C
approximately 70 lbs (31.75 kg).
(3) A description of the refrigeration system components is given below. See illustration for a
diagrammatic piping layout showing the interconnection of the components on pages 4-822 and 4-823.
4-811
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