Carrier 69NT40-561-300, Operation And Service Manual

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T-365 3–2
3.1.3 Evaporator Section
The evaporator section is shown below. 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.
If the unit is provisioned for XtendFRESH or equipped with eAutoFresh, system components are mounted in addi-
tion to the standard refrigeration unit components. The stepper motor component is installed in the vent; the air fil-
ter, CO
2
sensor, stepper motor drive and CO
2
sensing lines are installed on the rib of the upper grill.
Most evaporator components are accessible by removing the upper rear panel (as shown in the illustration) or by
removing the evaporator fan access panels (see
Figure 3.2 ).
Figure 3.2 Evaporator Section
1. Evaporator Fan Motor #1 (EM1)
2. Return Recorder Sensor/Temperature Sensor
(RRS/RTS)
3. Humidity Sensor (HS)
4. Evaporator Fan Motor #2 (EM2)
5. Evaporator Coil Heaters (Underside of Coil)
6. Evaporator Coil
7. Electronic Expansion Valve (EEV)
8. Evaporator Temperature Sensors (Location)
(ETS1 & ETS2)
9. Interrogator Connector (Rear) (ICR)
10. USDA Probe Receptacle PR2
11. USDA Probe Receptacle PR1
12. USDA Probe Receptacle PR3
13. Cargo Probe Receptacle PR4
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