2-2
T-292
2.1.3 Evaporator Section
The evaporator section (Figure 2-2) contains the
temperature recorder bulb or return recorder sensor,
return temperature sensor, evaporator expansion valve,
quench expansion valve, suction modulation valve,
dual-speed evaporator fans (EM1 and EM2),
evaporator coil and heater, drain pan heater, defrost
heaters, defrost temperature sensor, heat termination
thermostat and suction temperature sensor.
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.
The evaporator components are accessible by
removing the upper rear panel (as shown in the
illustration) or by removing the front access panels.
19
17
15
16
1
2
3
4
6
7
9
10
14
20
22
11
8
12
5
ALTERNATE USDA
LOCATION
26
21
23
24
25
18
13
1. Evaporator Fan Motor #1
2. Return Recorder Sensor
3. Return Temperature Sensor
4. Humidity Sensor
5. Mechanical Recorder Bulb
6. Evaporator Fan Motor #2
7. Defrost Temperature Sensor
8. Heater Termination Thermostat
9. Evaporator Coil
10. Evaporator Coil Heaters
11. Drain Pan Heater
12. Evaporator Expansion Valve Bulb
13. Evaporator Expansion Valve
14. Quench Expansion Valve
15. Low Side Access Valve
16. Suction Modulating Valve
17. Quench Valve Bulb
18. Suction Temperature Sensor
19. To Compressor
20. From Coil
21. To Coil
22. Interrogator Connector (Rear)
23. USDA Probe Receptacle PR2
24. USDA Probe Receptacle PR1
25. USDA Probe Receptacle PR3
26. Cargo Probe Receptacle PR4
Figure 2-2 Evaporator Section
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