Carrier 69NT40-541-001 Operation And Service page 77

3. Pre-trip diagnosis 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.
a. Press the PRE-TRIP key. This accesses a test selection menu.
b. TO RUN AN AUTOMATIC TEST: Scroll through the selections by pressing the UP ARROW or DOWN
ARROW keys to display AUTO, AUTO 2 or AUTO 3 as desired and then press the ENTER key.
1. 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.
2. While tests are running, "P#-#" will appear on the left display, where the #'s indicate the test number and
sub-test. The right display will show a countdown time in minutes and seconds, indicating how much
time there is left remaining in the test.
When a failure occurs during automatic testing the unit will suspend operation awaiting opera-
tor 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 indefi-
nitely, until the user manually enters a command.
When Pre-Trip test Auto 2 runs to completion without being interrupted, the unit will terminate
pre-trip and display "Auto 2" "end." The unit will suspend operation until the user depresses
the ENTER key!
When an Auto test runs to completion without a failure, the unit will exit the pre-trip mode, and return to normal con-
trol operation. If configuration variable CnF42 is set to IN, a DataCORDER trip start will be entered. If CnF42 is set
to OUT, the trip start will not be entered. However, dehumidification and bulb mode must be reactivated manually if
required.
c. 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.
1. Individually selected tests, other than the LED/Dis play 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.
2. 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.
3. Throughout the duration of any pre-trip test except the P-7 high pressure switch tests, the current and
pressure limiting processes are active.
d. 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 subtest (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.
CAUTION
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CAUTION
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