Carrier 69NT40-541-300, Операция и обслуживание, Страница: 80 / 152

T − 318 4 − 4
CAL will attempt to calibrate the carbon dioxide sensor.
When “CAL“ mode is selected the display will flash
“CAL“. The operator is to hold the “ENTER“ key for 5
seconds. The display will stop flashing and read “CAL“
for 5 seconds. The microprocessor will read the CO
2
value, and then compare that value to a known zero
value. If the sensor is within the calibration parameter
range, the microprocessor will determine the
appropriate offset for the sensor. If the sensor is outside
of this range, for example if the container is loaded or
has a high level of CO
2,
the controller will flash “NOCAL“
for 5 seconds then revert to the previous mode of
operation.
d. DELAY
In DELAY
mode, the operation of the eAutoFresh
system will be delayed for a set amount of time. This
allows time for the cargo to reach set point. In DELAY
mode, the eAutoFresh vent will open to the stored (FLO)
value when the return air temperature sensor (RTS) is at
or below set point plus the return offset value (rtn) or the
delay time (tIM), whichever comes first. The
eAutoFresh vent will be fully closed when return air
temperature sensor is greater than the set point plus the
offset temperature (rtn).
To set the unit in Delay mode, scroll until “DELAY“
appears in the left window, press the ENTER key to
activate the submenu. The first selection is the amount
of time (tIM) for the delay. Select the amount of time for
the delay by using the UP and DOWN arrow keys. The
range is from 1 to 72 hours in 1 hour increments. Press
the ENTER key 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 the
ENTER key to set the value and move to the return
temperature offset. Use the UP or DOWN arrow key to
scroll to the desired rtn rate. The range of offset is from
0.6 C to 2.8 C (1.0 F to 2.8 F) in 0.1 degree
increments. Press the ENTER key to set the value and
begin operation.
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 carbon dioxide
sensor. In “Gas limit” mode the microprocessor will
monitor and limit the amount of carbon dioxide within 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 5 C of set point and the carbon
dioxide level has reached the max limit or if the Oxygen
level has reached the lower limit. After the first 15
minutes of the vent opening the controller will again
evaluate 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, press the ENTER key to
activate the submenu. The first selection is the
maximum carbon dioxide (CO2LM). Select the max
level by using the UP and DOWN arrow keys.
The range is from 0 to 19% in 1% increments. Press the
ENTER key to set the value and move to the minimum
Oxygen level (O2LM). The range is from 2 to 20% in 1%
increments. Press the ENTER key 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 the ENTER key 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 dis-
play 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% incre-
ments, 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% increments,
the default setting is 10.
Rtn is an offset value used to expand the return air tem-
perature value to compensate for the fresh air entering
the container. The allowable range is from 0.6C to 2.8C
or 1.0 F to 5.0 F in 0.1 degree increments the default
setting is 2.8 C (5 F).
4.5 CONNECT WATER − COOLED CONDENSER
The water-cooled condenser is used when cooling
water is available and heating the surrounding air is
objectionable, such as in a ship’s hold. If water-cooled
operation is desired, connect in accordance with the
following subparagraphs.
4.5.1 Water-Cooled Condenser with Water
Pressure Switch
a. Connect the water supply line to the inlet side of con-
denser and the discharge line to the outlet side of the
condenser (see Figure 2-5).
b. Maintain a flow rate of 11 to 26 liters per minute (3 to 7
gallons per minute). The water pressure switch will
open to de-energize the condenser fan relay. The
condenser fan motor will stop until the water pressure
switch closes.
NOTE
If controller configuration variable CnF48 is
activated the condenser fan motor will activate
if the HPS opens twice in less than seven
minutes. Power cycling the unit resets the
counter.
c. To shift to air-cooled condenser operation, discon-
nect the water supply and the discharge line to the
water-cooled condenser. The refrigeration unit will
shift to air-cooled condenser operation when the wa-
ter pressure switch closes or if the controller configu-
ration variable CnF48 is activated, the condenser fan
motor will activate if the HPS opens twice in less than
seven minutes. Power cycling the unit resets the
count.