Carrier 69NT40-541-505, Operation And Service Manual, Page: 21 / 143

3–1 T-368
SECTION 3
DESCRIPTION
3.1 GENERAL DESCRIPTION
3.1.1 Refrigeration Unit − Front Section
The unit is designed so that the majority of the compo-
nents are accessible from the front (see
Figure 3.1 ).
The unit model number, serial number, and parts identi-
fication number can be found on the serial plate to the
left of the compressor.
3.1.2 Fresh Air Makeup Vent
The function of the upper or lower makeup air 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 is to moderate the atmo-
spheric level in the container in response to cargo res-
piration. When transporting frozen 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.
Figure 3.1 Refrigeration Unit - Front Section
1. Access Panel (Evap Fan #1) / TXV / HTT
2. Fork Lift Pockets
3. Control Box
4. Unit Display
5. Control Panel
6. Remote Monitoring Receptacle
7. Start
− Stop Switch, ST
8. Interrogator Connector
9. Return Temperature Supply/Recorder Sensor
Assembly (RTS/RRS)
10. Compressor
11. Condenser Grille
12. Power Cables and Plug (Location)
13. Autotransformer
14. Upper Fresh Air Makeup Vent
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