T-340
3–2
3.1.2
Fresh Air Makeup Vent
The function of the upper or lower fresh air makeup vent is to provide ventilation for commodities that require fresh air
circulation. A manually operated venting system is located in the upper left access panel. The optional eAutoFresh
vent system moderates the atmospheric level in the container in response to cargo respiration. When transporting fro
-
zen cargo loads, the vent will be closed. The upper left access panel contains the vent slide and motor assembly. It
may be removed to allow entry into the evaporator section where the CO
2
sensor and drive pack are located.
3.1.3
Evaporator Section
The evaporator section (see
) contains the return temperature sensor (RTS), humidity sensor (HS), elec
-
tronic expansion valve (EEV), dual speed evaporator fans (EM1 and EM2), evaporator coil and heaters, defrost tem
-
perature sensor (DTS), heat termination thermostat (HTT) and evaporator temperature sensors (ETS1 and ETS2).
Figure 3.2 Evaporator Section
1) Evaporator Fan #1
2) Return Recorder Sensor (RRS) / Return Tempera
-
ture Sensor (RTS)
3) Humidity Sensor (HS)
4) Evaporator Fan #2
5) Evaporator Coil
6) Evaporator Coil Heaters
7) Heat Termination Thermostat (HTT)
8) Defrost Temperature Sensor (DTS)
9) Electronic Expansion Valve (EEV)
10) Evaporator Temperature Sensors (ETS1 & ETS2)
11) Air Filter
12) CO
2
Sensor Sensing Line
13) CO
2
Sensor (COS)
14) CO
2
Sensor Outlet Line
15) Stepper Motor Drive (SD)
16) Stepper Motor (AF)
17) Interrogator Connector Rear (ICR)
18) USDA Probe Receptacle PR2
19) USDA Probe Receptacle PR1
20) USDA Probe Receptacle PR3
21) Cargo Probe Receptacle PR4
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