Carrier 69NT40-541-505, Operation And Service Manual, Page: 56 / 143

T-368 4–26
Configurable Functions - Cd43 is a user-selectable function. The operator can change the value of this function
to meet the operational needs of the container.
Cd43 AutoFresh Mode
Cd43 is a user selectable mode of operation that allows opening and closing of a
mechanical air vent door via a stepper motor. Selection modes are as follows:
OFF - Air makeup vent will remain closed.
USER - Allows for manual selection of the setting.
DELAY -The opening of the door is based on selected time, return temperature
and flow rate (percent opened).
gASLM - The opening is based percent open and CO
2
and O
2
selectable limits
(LM). This selection is only active if the unit has a CO
2
sensor.
TEST / CAL (CO
2
sensor option units only) - The door will fully open and close to
allow the user to inspect its operation. If CAL is selected, the controller will zero
calibrate the CO
2
sensor input.
If the unit is not configured with AutoFresh, the CD43 will display ----
Display Only Function - Cd44 is a display only function.
Cd44
eAutoFresh Values /
CO
2
Sensor Status
Code Cd44 displays the eAutoFresh CO
2
and O
2
values (CO
2
and O
2
) and CO
2
and O
2
limits (CO
2
LIM and O
2
LIM), respectively.
This function code will be dashed out if not configured for eAutofresh.
This function code will be dashed if CO
2
sensor is not detected, and a sensor is
not expected (didn't have one previously).
This function code will display ChECK if a CO
2
sensor has not been auto-detected
at the most recent power-up and was detected at a previous power-up. If ChECK
is displayed and the ENTER key is pressed, SEnSr is displayed with the choices
of YES and no:
“YES” sensor should be remembered as detected (present)
“no” sensor should not be remembered as being detected (not present)
Configurable Functions - Cd45 through Cd48 are user-selectable functions. The operator can change the value
of these functions to meet the operational needs of the container.
Cd45
Vent Position Sensor
(VPS) Position
Values: 0 to 240 for UPPER / 0 to 225 for LOWER
This function code will be dashed out if not configured for VPS.
When configured for VPS, Cd45 displays the current vent position in units of 5
CMH (units displayed as CM) or CFM (units displayed as CF) depending on the
selection of Cd46 (Airflow display units), Cd28 (Metric/Imperial) or the pressing of
the deg C/F key.
Cd45 will display whenever the control detects movement via the sensor unless
AL50 is active. Cd45 will display for 30 seconds, then time out and return to the
normal display mode.
Cd46 Airflow Display Units
Selects the airflow units to be displayed by Cd45 if configured for Vent Position
Sensor or displayed by USER/FLO under Cd43 if configured for Autoslide.
CF = Cubic Feet per Minute
CM = Cubic Meters per Hour
bOth = Displays CF or CM depending on the setting of Cd28 (Metric/Imperial) or
the pressing of the degree C/F key.
Cd47
Variable Economy
Temperature Setting
Used when Economy Mode (CnF22) is set to 3-cust. Display will show when the
unit is not configured for Economy Mode.
When the unit has a perishable setpoint and Economy Mode is active, at the start
of each cooling or heating cycle, high speed evaporator fans will run for 3 minutes.
After three minutes, the evaporator fans will be switched to low speed any time that
the supply temperature is /- 0.25

C of the setpoint and the return tempera-
ture is less than or equal to the supply tempe the user selected Cd47 (val-
ues are 0.5

C - 4.0

C, default is 3.0

C).
Table 4–5 Controller Function Codes
Code
No.
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