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TM 55-8145-221-14&P
0003 00-1
REFRIGERATED CONTAINER SYSTEM
THEORY OF OPERATION
0003 00
COMPONENT TECHNICAL THEORY OF OPERATION.
The diesel-powered generator set provides power for the Refrigeration Unit and a power source for the switch operated light.
Fuel can be added manually to the generator set fuel tank by the operator. Another method to add fuel to the generator set is
by attaching a flexible fuel line to the elbow port on the auxiliary fuel tank. The flexible fuel line is located on the door in the
fuel line holder of the generator set. This is located near the loads cable door and control panel of the generator set.
Three-phase power received from the generator set provides the external power for the Refrigeration Unit. A power cable is
attached from the Refrigeration Unit to the generator set. This is located in the back of the Refrigeration Unit in the stowage
compartment. A cable located on the Container Unit is attached to the cable on the Refrigeration Unit. The five wires are
then attached to the generator set on the loads panel.
Insulation is built into the walls, floor and ceiling which reduces the gain and/or loss of heat between the container interior
and ambient conditions. The ribbed floor and wall spacer strips allow conditioned air to circulate around the cargo. Two
doors provide access to the container interior. Each door is insulated and seals tightly against the container frame when
closed. The right access door contains an emergency escape door to prevent entrapment of personnel. The emergency door
can only be removed from inside the container. In an emergency condition, the escape door can allow exit of personnel by
unscrewing all six holders, then pushing out the insulation plug to exit. Floor drains are located at each corner of the ribbed
floor for escape of excess moisture.
The 100 watt interior light receives electrical power from the power cord plugged into the 110-volt receptacle on the
generator set (refer to TM 9-6115-642-10). The receptacle is located as a convenience receptacle near the control panel. The
light is controlled by a hand-operated switch mounted overhead near the right door and has an on/off position. This will
provide continuous light in the container provided the generator set is operational.
The metal 31-gallon auxiliary fuel tank stores fuel for the generator set. Fuel level is indicated by the float actuated fuel
gauge. The fuel gauge has readings in 1/8 gallon increments. The fuel line from the tank provides fuel to the generator set
engine and is located in the fuel line storage box.
The temperature recorder maintains a 24-hour record of the container's internal temperature. A sensing bulb, mounted on the
inside container wall, causes the cartridge pen to move up or down on the paper chart. At the same time, a spring driven
timer turns the chart paper. As the pen moves along the paper, a permanent 48-hour record of the time and temperature is
made. The timer must be wound at least every 30 days by winding the key.
External power to the Refrigeration Container System can be achieved by connecting a NATO Slave compatible cable from
the external power source to the NATO Slave receptacle on the diesel generator set. Once connected the operation for start
up of the diesel generator set is the same. The diesel-powered generator set will then provide power for the Refrigeration
Unit. The generator set will also be a power source for the switch-operated light by connecting a cable to the convenience
receptacle located near the control panel. External fuel can be added manually or added from the flexible fuel line attached to
the external fuel tank.
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