Carrier 69NT40-511-199 - Manual (Page 22)

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1. Evaporator Fan Motor #1 (EM1)
2. Humidity Sensor (HS) -- Optional
3. Return Recorder Sensor (RRS)
4. Return Temperature Sensor (RTS)
5. Mechanical Recording Thermometer Bulb
6. Mechanical Recording Thermometer Bulb --
Used on PID NT0073
7. Evaporator Fan Motor #2 (EM2)
8. Defrost Termination Sensor (DTS)
9. Heater Termination Thermostat (HTT)
10. Evaporator Coil
11. Drain Pan Heater (DPH)
12. Thermostatic Expansion Valve
13. Heat Exchanger
14. Interrogator Receptacle (IC) -- Optional
15. USDA Probe Receptacle (PR2) -- Optional
16. USDA Probe Receptacle (PR1) -- Optional
17. USDA Probe Receptacle (PR3) -- Optional
18. Cargo Probe Receptacle (PR4) -- Optional
19. Evaporator Coil Heaters
Figure 2-2. Refrigeration Unit -- Rear (Panels Removed)