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2.1.3 Evaporator Section
The evaporator section (Figure 2-2) contains the
temperature recorder bulb or return recorder sensor,
return temperature sensor, thermostatic expansion
valve, dual-speed evaporator fans (EM1 and EM2),
evaporator coil and heater, drain pan heater, defrost
heaters, defrost temperature sensor, heat termination
thermostat, and heat exchanger.
1. Evaporator Fan Motor #1
2. Supply Recorder Sensor
3. Supply Temperature Sensor
4. Humidity Sensor
5. Mechanical Recorder Bulb
6. Evaporator Fan Motor #2
7. Defrost Temperature Sensor
8. Heater Termination Thermostat
9. Evaporator Coil
10. Drain Pan Heater
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18
17
16
15
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12
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Figure 2-2 Evaporator Section
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The evaporator fans circulate air through the container
by pulling it in the bottom of the unit, directing it through
the evaporator coil, where it is heated or cooled, and
discharging it at the top.
The evaporator components are accessible by
removing the upper rear panel (as shown in the
illustration) or by removing the front access panels.
4
3
6
5
2
1
11.
Hermetic Thermostatic Expansion Valve
12.
Semi--Hermetic Thermostatic Expansion Valve
13.
Heat Exchanger
14.
Interrogator Connector (Rear)
15.
USDA Probe Receptacle PR2
16.
USDA Probe Receptacle PR1
17.
USDA Probe Receptacle PR3
18.
Cargo Probe Receptacle PR4
19.
Evaporator Coil Heaters
2-2
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8
HTT Alternate Location
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