TM 10-8145-222-23
0003
INSULATED CONTAINER CONTINUED
Figure 4. Microprocessor Controller Display.
REFRIGERATION UNIT
The insulated container has two distinct and interchangeable cargo zones a refrigerator zone and a freezer zone.
The unit is equipped with a condenser and a split evaporator system. The refrigerator zone evaporator is connected
parallel with the freezer zone evaporator. Both evaporators are secured to the ceiling. The refrigeration unit uses non-
ozone depleting R404A refrigerant. The condenser assembly is located on the upper front outside wall of the insulated
container, providing favorable airflow during transport. The condenser is designed with a tilt so liquid refrigerant
collects at the lowest point of the condenser. A belt driven and semi-hermetic compressor is used in the condenser
assembly.
Design Features of Evaporator
Evaporator. The evaporators supply cool air to the insulated container refrigerated and freezer zone. A thermal
expansion valve regulates refrigerant flow through each evaporator in order to reach and maintain the desired air
temperature in the container cargo sections.
Evaporator Assembly. Each evaporator assembly (Figure 5) is equipped with heat and defrost elements. The air
supply is directed across the ceiling while the return air is drawn up into the evaporator assembly.
Heater/Defrost. The heater and defrost elements have two functions. They provide heat to the cargo compartment
when required and during cooling they defrost the evaporator coil during a defrost cycle. The evaporator assembly is
equipped with a thermometer to measure the cargo compartment temperature.
Blower Assembly. Each evaporator contains two blower assemblies. The blowers force air to pass through the
evaporator.
Drainage. A drip pan is located within the evaporator assembly. The drip pan allows water from evaporator to collect
in the evaporator housing. Two condensate drain lines on each evaporator direct water collected to drain tubes in the
container wall. Drain tubes in the container wall direct the condensate outside the MTRCS insulated container.
Condensate drain lines are equipped with drain line heaters to prevent drain lines from freezing.
