Beware of unannounced starting of the evaporator and gas cooler fans. The unit may cycle the fans and compressor unexpectedly as control requirements dictate.
1.Check inside for the following:
a.Check channels or “T” bar floor for cleanliness. Channels must be free of debris for proper air circulation.
b.Check container panels, insulation and door seals for damage. Effect permanent or temporary repairs.
c.Visually check evaporator fan motor mounting bolts for proper securement (refer to paragraph 7.12).
d.Check for visible corrosion on the evaporator stator and fan deck (refer to paragraph 7.13).
e.Check for dirt or grease on evaporator fans or fan deck and clean if necessary.
f.Check evaporator coil for cleanliness or obstructions. Wash with fresh water.
g.Check defrost drain pans and drain lines for obstructions and clear if necessary. Wash with fresh water.
h.Check panels on refrigeration unit for loose bolts and condition of panels. Make sure TIR devices are in place on access panels.
2.Check gas cooler coil for cleanliness. Wash with fresh water.
3.Open control box door. Check for loose electrical connections or hardware.
4.Check color of moisture-liquid indicator.
Do not attempt to remove power plug(s) before turning OFF start−stop switch (ST), unit circuit breaker(s) and external power source.
Make sure the power plugs are clean and dry before connecting to power receptacle.
5.2.1Connection To 380/460 VAC Power
1.Make sure start−stop switch (ST, on control panel) and circuit breaker (CB−1, in the control box) are in position “0” (OFF).
2.Plug the 460 VAC (yellow) cable into a de−energized 380/460 VAC, 3−phase power source. Energize the power source. Place circuit breaker (CB−1) in position “I” (ON). Close and secure control box door.
5.3Adjust Fresh Air Makeup Vent
The purpose of the fresh air makeup vent is to provide ventilation for commodities that require fresh air circulation. The vent must be closed when transporting frozen foods.
Air exchange depends on static pressure differential, which will vary depending on the container and how the container is loaded.
Units may be equipped with a vent position sensor (VPS). The VPS determines the position of the fresh air vent and sends data to the controller display.
5.3.1Upper Fresh Air Makeup Vent
Two slots and a stop are designed into the Upper Fresh Air disc for air flow adjustments. The first slot allows for a 0 to 30% air flow; the second slot allows for a 30 to 100% air flow. To adjust the percentage of air flow, loosen the wing nut and rotate the disc until the desired percentage of air flow matches with the arrow. Tighten the wing nut. To clear the gap between the slots, loosen the wing nut until the disc clears the stop.
Figure 5.1 gives air exchange values for an empty container. Higher values can be expected for a fully loaded container.
Figure 5.1 Upper Fresh Air Makeup Flow Chart
The VPS allows the user to determine the position of the fresh air vent via Function Code 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 Function Code 45 will display the Fresh Air Vent Position.
The vent position 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)
Vent remains in the new position for at least 4 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, an alarm will be generated. This provides the user with the ability to change the vent setting without generating multiple events in the DataCORDER.
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 carbon dioxide 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 O2 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 temperature value in order to compensate for fresh air entering the container. The allowable range is 0.6°C − 2.8°C or 1.0°F − 5.0°F in 0.1 degree increments, default setting is 2.8°C (5°F).
5.4Connect Remote Monitoring Receptacle
If remote monitoring is required, connect remote monitor plug at unit receptacle. When the remote monitor plug is connected to the remote monitoring receptacle, the following remote circuits are energized:
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 |
Make sure that the unit circuit breaker CB−1 and the START−STOP switch (ST) are in the “O” (OFF) position before connecting to any electrical power source.
1.With power properly applied and the fresh air vent position set (if required) place the START−STOP switch to “I” (ON).
The electronic phase detection system will check for proper phase rotation within the first 5 seconds. If rotation is not correct, the phase will be reversed.
2.The Controller Function Codes for the container ID (Cd40), software version (Cd18) and unit model number (Cd20) will be displayed in sequence.
3.Continue with Start Up Inspection, paragraph 5.5.
To stop the unit, place the START−STOP switch in position “0” (OFF).
Check rotation of gas cooler and evaporator fans.
5.5.2Check Controller Function Codes
Check, and if required, reset controller Function Codes (Cd27 through Cd39) in accordance with desired operating parameters. Refer to Table 4–6.
1.Check and, if required, set the DataCORDER Configuration in accordance with desired recording parameter. Refer to Table 4-2.
2.Enter a “Trip Start.” To enter a “Trip Start,” do the following:
a.Depress the ALT MODE key. When the left display shows, dC, depress the ENTER key.
b.Scroll to Code dC30.
c.Depress and hold the ENTER key for five seconds.
d.The “Trip Start” event will be entered in the DataCORDER.
Allow unit to run for five minutes to stabilize conditions and perform a pre−trip diagnosis in accordance with the following paragraph.
Pre−trip diagnostics should not be performed with critical temperature cargoes in the container.
When Pre−Trip key is pressed, economy, dehumidification and bulb mode will be deactivated. At the completion of Pre−Trip activity, economy, dehumidification and bulb mode must be reactivated.
Pre−trip diagnosis provides automatic testing of the unit components using internal measurements and comparison logic. The program will provide a “PASS” or “FAIL” display to indicate test results.
The testing begins with access to a Pre−trip selection menu. The user may have the option of selecting one of two automatic tests. These tests will automatically perform a series of individual Pre−trip tests. The user may also scrolldown to select any of the individual tests. When only the short sequence is configured, it will appear as “AUtO” in the display. Otherwise “AUtO1” will indicate the short sequence and “AUtO2” will indicate the long sequence. The test short sequence will run tests P0 through P6. The long test sequence will run tests P0 through P10.
A detailed description of the Pre−trip test codes is listed in Table 4–9. If no selection is made, the pre−trip menu selection process will terminate automatically. However, dehumidification and bulb mode must be reactivated manually if required.
Scrolling down to the “rSLts” code and pressing ENTER will allow the user to scroll through the results of the last Pre−trip testing run. If no Pre−test has been run (or an individual test has not been run) since the unit was powered up, “−−−−” will be displayed.
To start a Pre−trip test, do the following:
1. Prior to starting tests, verify that
unit voltage (Function Code Cd07) is within tolerance and unit amperage
draw (Function Codes Cd04, Cd05, Cd06) are within expected limits. Otherwise,
tests may fail incorrectly.
2. All alarms must be rectified and cleared before starting tests.
3. Pre−trip may also be initiated via communications. The operation is
the same as for the keypad initiation described below except that should
a test fail, the pre−trip mode will automatically terminate. When initiated
via communications, a test may not be interrupted with an arrow key, but
the pre−trip mode can be terminated with the PRE−TRIP key.
1.Press the PRE−TRIP key. This accesses a test selection menu.
2.TO RUN AN AUTOMATIC TEST: Scroll through the selections by pressing the UP ARROW or DOWN ARROW keys to display AUTO, AUTO 1, AUTO 2 or AUTO 3 as desired, then press the ENTER key.
a.The unit will execute the series of tests without any need for direct user interface. These tests vary in length, depending on the component under test.
b.While tests are running, “P#−#” will appear on the left display; the #’s indicate the test number and sub−test. The right display will show a countdown time in minutes and seconds, indicating the amount of time remaining in the test.
When a failure occurs during automatic testing, the unit will suspend operation awaiting operator intervention.
When an automatic test fails, it will be repeated once. A repeated test failure will cause “FAIL” to be shown on the right display, with the corresponding test number to the left. The user may then press the DOWN ARROW to repeat the test, the UP ARROW to skip to the next test or the PRE−TRIP key to terminate testing. The unit will wait indefinitely or until the user manually enters a command.
When Pre−Trip test Auto2 runs to completion without being interrupted, the unit will terminate pre−trip and display “Auto2” “end.” The unit will suspend operation until the user depresses the ENTER key!
When an Auto1 runs to completion without a failure, the unit will exit the pre−trip mode and return to normal control operation. However, dehumidification and bulb mode must be reactivated manually if required.
3.TO RUN AN INDIVIDUAL TEST: Scroll through the selections by pressing the UP ARROW or DOWN ARROW keys to display an individual test code. Pressing ENTER when the desired test code is displayed.
a.Individually selected tests, other than the LED/Display test, will perform the operations necessary to verify the operation of the component. At the conclusion, PASS or FAIL will be displayed. This message will remain displayed for up to three minutes, during which time a user may select another test. If the three minute time period expires, the unit will terminate Pre−trip and return to control mode operation.
b.While the tests are being executed, the user may terminate the Pre−trip diagnostics by pressing and holding the PRE−TRIP key. The unit will then resume normal operation. If the user decides to terminate a test but remain at the test selection menu, the user may press the UP ARROW key. When this is done, all test outputs will be de-energized and the test selection menu will be displayed.
c.Throughout the duration of any Pre−trip test (except the P−7 high pressure switch tests), the current and pressure limiting processes are active. The current limiting process only is active for P−7.
4.Pre−Trip Test Results
At the end of the Pre−trip test selection menu, the message “P,” “rSLts” (Pre−trip results) will be displayed.
Pressing the ENTER key will allow the user to see the results for all subtests (i.e., 1−0, 1−1, etc).
The results will be displayed as “PASS” or “FAIL” for all the tests run to completion since power up. If a test has not been run since power up, “-----” will be displayed.
Once all Pre−test activity is completed, dehumidification and bulb mode must be reactivated manually if required.
For units configured with four temperature probes, which include the supply and return temperature probes and the supply and return DataCORDER probes, the controller continuously performs probe diagnosis testing that compares the four probes. If the diagnosis result indicates a problem exists, the controller will perform a probe check to identify which probe or probes are in error.
a.Probe Diagnostic Logic:
In the perishable mode of operation, both pairs of supply and return probes are monitored for probe disagreement. Probe disagreement is considered a difference of 0.5°C (0.9°F) or greater between the supply air sensors and/or a difference of 2.0°C (3.6°F) between the return air sensors. Probe disagreement found in either pair can trigger a defrost probe check.
In the frozen mode of operation, only the controlling probes are considered. Disagreement of the controlling probes can trigger a defrost probe check, which will occur when the difference between the sensors are greater than 2.0°C (3.6°F). Normally, the controlling probes are the return probes but if both return probes are invalidated, the supply probes are used for control purposes. Probe disagreement of the non−controlling probe pair will not trigger a defrost probe check.
If the supply probes agree and return probes agree, all supply and return sensors are valid and the unit returns to normal control.
If supply probes disagree and the return probes agree, then invalidate the worst supply probe. If the probe check is run as part of Pre−trip P−5, an alarm will be triggered for the invalidated probe. If it is a run time defrost probe check, the invalidated probe will be passed over and no alarm will be triggered. However, if the best supply probe is greater than 1.2°C (2.2°F) difference with respect to its return probes, the best supply probe is also invalidated. If unit is in perishable operation, a probe alarm will be triggered for both supply probes.
If the supply probes agree and return probes disagree, invalidate the worst return probe. If the probe check is being run as part of Pre−trip P−5, an alarm will be triggered for the invalidated probe. If it is a run time defrost probe check, the invalidated probe will be passed over and no alarm will be necessary. If the best return probe is greater than 1.2°C (2.2°F) difference with respect to its supply probes, then the best return probe is also invalidated. If unit is in perishable operation, a probe alarm will be triggered for both return probes.
b.Probe Check Procedure:
A probe check diagnostic procedure is executed during Pre−trip P−5. A defrost cycle probe check may be accomplished at the end of defrost by energizing the evaporator motors for eight minutes at the end of the normal defrost. The defrost light will remain on during this period. If supply probes are within limits and return probes are within limits, the unit will return to normal control.