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

Page: 104 / 174

T-365 5–6
e. GAS LIMIT (gASLM)
In GAS LIMIT mode, access to the submenu is available provided a perishable set point has been
selected, and a valid reading is detected from the CO
2
sensor. In “Gas limit” mode the microprocessor
will monitor and limit the level of CO
2
in the container by opening and closing the eAutoFresh vent. The
vent will open to the (FLO) setting once the unit has completed initial temperature pull down or if the
cargo temperature is within 5C of set point and the CO
2
level has reached the max limit or if the O
2
level
has reached the lower limit. After the first 15 minutes of the vent opening the controller will again evalu-
ate the level of CO
2
, and/or O
2
levels. If after the first 15 minutes the gas limit values are satisfied, the
vent will close, if either gas limit has not been satisfied within 15 minutes the air exchange vent will open
in 10 CMH increments every 15 minutes until both gas concentrations are satisfied. Once all limits are
satisfied the vent will return to the closed position. If conditions are not met with the slide open 100% for
90 minutes AL29 will be activated.
To operate in GAS LIMIT mode, scroll until gASLM appears in the left window, and press ENTER to acti-
vate the submenu. The first selection is the maximum CO
2
level (CO2LM). Select the maximum CO
2
level by using the UP and DOWN arrow keys. The range is from 0 to 19% in 1% increments. Press
ENTER to set the value and move to the minimum O
2
level (O2LM). The range is from 2% to 20% in 1%
increments. Press ENTER to set the value and move to the FLO rate. Use the UP or DOWN arrow key
to scroll to the desired FLO rate. The range is from 0 to 220CM (0 to 129CF) in increments of 5 and 3
respectively. Press ENTER to set the value and begin operation.
Operational Parameters (Sub Menu Options):
FLO indicates the opening to which the slide will move based on the stored value in CMH (in increments
of 5) or CFM depending on the selection of Cd46 (Airflow display units), Cd28 (Metric/Imperial) or the
pressing of the deg C/F key. CFM is displayed as CF, CMH is displayed as CM.
tIM is the time delay prior to the door opening. The time range is from 1 to 72 hrs in 1 hr increments.
CO2LM is the maximum level of CO
2
that is allowed for the cargo. The range is from 0% to 19% in 1%
increments, the default setting is 10.
O2LM is the minimum level of O
2
that is allowed for the cargo. The range is from 2% to 20% in 1% incre-
ments, the default setting is 10.
Rtn is an offset value used to expand the return air temperature value to compensate for the fresh air
entering the container. The allowable range is from 0.6°C to 2.8°C or 1.0°F to 5.0°F in 0.1 increments
the default setting is 2.8°C (5°F).
5.5 CONNECT REMOTE MONITORING RECEPTACLE
If remote monitoring is required, connect the remote monitor plug at the unit receptacle, see Figure 3.5 . When the
remote monitor plug is connected to the remote monitoring receptacle, the following remote circuits are energized:
5.6 STARTING AND STOPPING INSTRUCTIONS
WARNING
!
Make sure that the unit circuit breaker(s) (CB − 1 & CB − 2) and the START − STOP switch (ST) are
in the “O” (OFF) position before connecting to any electrical power source.
CIRCUIT FUNCTION
Sockets B to A Energizes remote cool light
Sockets C to A Energizes remote defrost light
Sockets D to A Energizes remote in − range light