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

Page: 102 / 174

T-365 5–4
c. Air Sampling for Carbon Dioxide (CO
2
) Level Loosen hex nuts and move the cover until the arrow on the
cover is aligned with the “atmosphere sampling port” label. Tighten the hex nuts and attach a 3/8 in.
hose to the sampling port. If the internal atmosphere content has reached an unacceptable level, the
operator may adjust the disc opening to meet the required air flow volume to ventilate the container.
5.3.3 Vent Position Sensor
The VPS allows the user to determine the position of the fresh air vent via Cd45. This function code is accessible
via the Code Select key.
The vent position will display for 30 seconds whenever motion corresponding to 5 CMH (3 CFM) or greater is
detected. It will scroll in intervals of 5 CMH (3 CFM). Scrolling to Cd45 will display the Fresh Air Vent Position.
The position of the vent will be recorded in the DataCORDER whenever the unit is running under AC power and
any of the following:
Trip start
On every power cycle
Midnight
Manual changes greater than 5 CMH (3 CFM) remaining in the new position for at least four minutes
NOTICE
The user has four minutes to make necessary adjustments to the vent setting. This time calcu-
lation begins on the initial movement of the sensor. The vent can be moved to any position
within the four minutes. On completion of the first four minutes, the vent is required to remain
stable for the next four minutes. If vent position changes are detected during the four minute
stability period, AL50 will be generated. This provides the user with the ability to change the
vent setting without generating multiple events in the DataCORDER.
5.4 eAutoFresh OPERATION
The eAutoFresh system allows the opening and closing of the mechanical air vent slide. The opening and closing
of the slide is determined by the mode selected through Cd43.
The modes of operation are OFF, USER, TEST, DELAY, and GASLIMIT. Each mode of operation has submenus
with selectable parameters. Not all parameters are available in each submenu.
Upon power up, the controller will fully close the eAutoFresh air vent. Nine seconds after power up, the controller will
check if there is a carbon dioxide (CO
2
) sensor connected. When a CO
2
sensor is detected, the controller will enable
access to the Gas Limit mode of operation. If no sensor is detected, the only modes of operation available will be Test,
User, and Delay. The controller will then resume operation in the last mode of operation before power interruption.
5.4.1 eAutoFresh Pre − Trip Inspection
Pre − trip testing of the eAutoFresh system is performed during Pre − Trip test P0. Operation of the system may be
observed during this test.
Upon initiation of Pre − Trip P0, the current state will be saved and the vent will fully close. This will be followed by
two sequences of opening to 100% and returning to the closed position. No other eAutoFresh mode of operation
will be available until the two cycles of opening and closing have completed. Upon termination of the test, the vent
will open to the previous state and operation will return to the previous mode.
If the last mode was gASLM, the vent will open to the preset FLO setting, the controller will start taking new read-
ings and control based on those readings.
5.4.2 eAutoFresh Start − Up Procedure
To start the system, do the following:
1. Press the “CODE SELECT” key (see Figure 4.2 ).
2. Press the “UP or DOWN” arrow key until “Cd43” is displayed, then press “ENTER”.
3. Press the “UP or DOWN“ arrow key to access the desired mode of operation. When the mode operation is
displayed press the enter key to access the submenu parameters.