T-318
2
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2
2.1.3 Evaporator Section
The evaporator section (Figure 2-2) contains the return
temperature sensor,
humidity sensor,
thermostatic
expansion valve, dual-speed evaporator fans (EM1 and
EM2), evaporator coil and heaters, defrost temperature
sensor, heat termination thermostat, and heat
exchanger.
The evaporator fans circulate air through the container
by pulling it in the top of the unit, directing it through the
evaporator coil where it is heated or cooled, and
discharging it at the bottom.
The evaporator components are accessible by
removing the upper rear panel (as shown in Figure 2-2
below).
TXV Bulb
(under Insulation)
1. Evaporator Fan Motor #1
2. Return Recorder Sensor (RRS) / Return
Temperature Sensor (RTS)
3. Humidity Sensor
4. Evaporator Fan Motor #2
5. Defrost Temperature Sensor
6. Heater Termination Thermostat
7. Evaporator Coil
8. Hermetic Thermostatic Expansion Valve
9.
Heat Exchanger
10. Interrogator Connector (Rear)
11. USDA Probe Receptacle PR2
12. USDA Probe Receptacle PR1
13. USDA Probe Receptacle PR3
14. Cargo Probe Receptacle PR4
15. Evaporator Coil Heaters
16. TXV Bulb Routing
Figure 2-2 Evaporator Section
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Units With Center Access Panel