Carrier 69NT40-541-306, Операция и обслуживание

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T-354 3–2
3.1.3 Evaporator Section
The 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 through
the 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 Panel
1. Evaporator Fan Motor #1
2. Supply Recorder Sensor (SRS) / Supply Tem-
perature Sensor (STS)
3. Humidity Sensor
4. Evaporator Fan Motor #2
5. Defrost Temperature Sensor
6. Heater Termination Thermostat
7. Evaporator Coil
8. Hermetic Thermostatic Expansion Valve (TXV)
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
- - - - -
TXV Bulb
(under Insulation)
2
1
3
4
5
6
7
8
16
15
9
10
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12
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