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5–7
T-362
CAUTION
!
When a Pre-trip Auto 2 test 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!
3. 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. Press the Down Arrow key to repeat the
test, the Up Arrow key to skip to the next test, or the PRE-TRIP key to terminate testing. The unit will wait
indefinitely or until a command is entered.
CAUTION
!
When a failure occurs during automatic testing, the unit will suspend operation awaiting oper
-
ator intervention.
4. To Run an Individual Test: Scroll through the selections by pressing the Up or Down Arrow keys to display
an individual test code. Press the ENTER key when the desired test code is displayed.
• 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 mes
-
sage 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.
• 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.
• Throughout the duration of any Pre-trip test (except during P-7 high pressure switch tests), the current lim
-
iting and pressure limiting processes are both active. The current limiting process is only active for P-7.
5.8.3
Displaying Pre-Trip Test Results
1. Press the PRE-TRIP key to access the Pre-trip test selection menu. “SELCt Prtrp” will be displayed.
2. Press the Arrow keys until the message “P,” “rSLts” (Pre-trip results) is displayed.
3. Press the ENTER key. The results for all Pre-trip sub tests are available from this menu (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.
5.9 Probe Diagnostics
A complete temperature probe check is performed during the P5 pre-trip test. A probe check is also run at the end
of a defrost cycle; 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 operation. During normal operation, the controller
continuously monitors and compares adjacent temperature probe readings.
The probe check procedure consists of running the evaporator fans for up to eight minutes in order to compare the
readings from the adjacent temperature probes. If a significant difference in temperature readings is detected
between probes, a defrost cycle, followed by another probe check may be initiated. Any continued disagreement
between probes will prompt the controller to invalidate the failed temperature probe, and the backup probe will be
used for temperature control.
In Perishable Mode, 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.
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