T-354 3–23.1.3 Evaporator SectionThe evaporator section (Figure 3.2) contains the supply temperature sensor, humidity sensor, thermostatic expan-sion 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 from the bottom of the unit, directing it throughthe 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 Figure 3.2).Figure 3.2 Evaporator Section - UPFLOW Units With Center Access Panel1. Evaporator Fan Motor #12. Supply Recorder Sensor (SRS) / Supply Tem-perature Sensor (STS)3. Humidity Sensor4. Evaporator Fan Motor #25. Defrost Temperature Sensor6. Heater Termination Thermostat7. Evaporator Coil8. Hermetic Thermostatic Expansion Valve (TXV)9. Heat Exchanger10. Interrogator Connector (Rear)11. USDA Probe Receptacle PR212. USDA Probe Receptacle PR113. USDA Probe Receptacle PR314. Cargo Probe Receptacle PR415. Evaporator Coil Heaters16. TXV Bulb Routing- - - - -TXV Bulb(under Insulation)21345678 161591011121314
