Vent Position Sensor; Eautofresh Operation - Carrier Transicold 69NT40-561-001 Operation And Service Manual

On some models the air slide is supplied with two adjustable air control discs. The fresh air makeup can be
adjusted for 15, 35, 50 or 75 cubic meters per hour (CMH). The air flow has been established at 60 Hz power and
2-1/2 inch T bar and with 15 mm (0.6 inch) H
Loosen the hex nut, adjust each disc to the required air flow, then tighten hex nut.
The main air slide is in the fully closed position during reduced air flow operation when equipped with air
control discs.
c. Air Sampling for Carbon Dioxide (CO
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 vent position sensor (VPS) allows the user to determine the position of the fresh air vent via Cd45. This func-
tion 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 toCd45 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
The user has four minutes to make necessary adjustments to the vent setting. This time calculation 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

Procedures and technical information related to the eAutoFresh™ venting system can be found in the
oFresh Manual, located in the Literature section of the Container Refrigeration website. To find the manual from
the Literature section, click on Options > eAutoFresh.
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
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.
T-340
O external static above free blow.
2
NOTE
) Level
2
NOTE
) sensor connected.When a CO
2
5–4
sensor is detected, the controller will
2
T-342 eAut-