Carrier 69NT40-541-505, Operation And Service Manual, Page: 22 / 143

T-368 3–2
3.1.3 Evaporator Section
The evaporator section (Figure 2-2) contains the sup-
ply temperature sensor, humidity sensor, thermostatic
expansion valve, dual-speed evaporator fans (EM1
and EM2), evaporator coil and heaters, defrost tem-
perature 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
through the evaporator coil where it is heated or
cooled, and discharging it at the top.
The evaporator components are accessible by remov-
ing the upper rear panel (as shown in
Figure 3.2 ).
Figure 3.2 Evaporator Section - Units with Center Access Panel
1. Evaporator Fan Motor #1
2. Supply Recorder Sensor (SRS) / Supply Tempera-
ture Sensor (STS)
3. Humidity Sensor
4. Evaporator Fan Motor #2
5. Evaporator Coil
6. Evaporator Coil Heaters
7. Defrost Temperature Sensor (DTS)
8. Heater Termination Thermostat (HTT)
9. Heat Exchanger
10. Thermostatic Expansion Valve (TXV)
11. TXV Bulb
12. Interrogator Connector (Rear) (ICR)
13. USDA Probe Receptacle PR2
14. USDA Probe Receptacle PR1
15. USDA Probe Receptacle PR3
16. Cargo Probe Receptacle PR4
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