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8.1.3 CA Components in the Refrigeration
Evaporator Section
The refrigeration evaporator section (see Figure 57 or
Figure 58, page 91) contains an air compressor,
nitrogen membrane separator, an oxygen solenoid
valve, a carbon dioxide solenoid valve and various
sampling solenoid valves and sensors.
Also in this section are a condensing line that helps to
condense the moisture in the air so that the membrane
air filters can remove it more efficiently. It is located
under the refrigeration evaporator coil.
The air compressor takes ambient air and compresses it
to a higher pressure that is in turn filtered and heated,
then passed on to the nitrogen membrane separator.
The membrane temperature sensor is used to control
6
7
1
To Air Solenoid Valve (ASV)
5
1. Nitrogen (N
) Discharge
2
2. Carbon Dioxide Gas Charge Port
(Used to attach a CO
3. Nitrogen Membrane Separator
4. Condensing Line
Figure 57. Controlled Atmosphere Components - - Evaporator Section
T-305
8
bottle)
2
the air temperature entering the nitrogen membrane
separator, and a nitrogen purity valve is used to control
the flow of air through the nitrogen membrane
separator.
The nitrogen membrane separator takes the heated
pressurized air and generates high purity nitrogen for
use in the cargo area of the container. Oxygen and other
gases that have been separated during this process are
discharged out through the front of the container.
The side wall mounted solenoid valves, near the
evaporator fan, sample air from various points of use in
the system. Data is then supplied to the CA Controller
from the oxygen and carbon dioxide sensors to control
such factors as calibration, and oxygen and carbon
dioxide levels and to perform diagnostic checks.
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2
3
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5. Air Calibration Capillary
6. Nitrogen Purity Valve (NPV)
7. Oxygen Solenoid Valve (OSV)
8. Carbon Dioxide Solenoid Valve (CSV)
9. Membrane Temperature Sensor (MTS)
90
SIDE VIEW
4
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