Carrier 69NT40-541-306 Operation And Service
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T-354 5–6When 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 tothe next test or the PRE-TRIP key to terminate testing. The unit will wait indefinitely until theuser manually enters a command.CAUTION!When Pre-Trip test Auto 2 runs to completion without being interrupted, the unit will terminatepre-trip and display “Auto 2" “end”. The unit will suspend operation until the user depressesthe ENTER key!When an Auto test runs to completion without a failure, the unit will exit the pre-trip mode andre turn to normal control operation. If configuration variable CnF42 is set to IN, a Data-CORDER 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 DOWNARROW keys to display an individual test code. Pressing ENTER when the desired test code is dis-played.4. Individually selected tests, other than the LED/ Display test, will perform the operations necessary to verifythe 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 mayselect another test. If the three minute time period expires, the unit will terminate pre-trip andreturn to control mode operation.5. While the tests are being executed, the user may terminate the pre-trip diagnostics by pressing and holdingthe PRE-TRIP key.The unit will then resume normal operation. If the user decides to terminate a test but remainat the test selection menu, the user may press the UP ARROW key. When this is done all testoutputs will be de-energized and the test selection menu will be displayed.6. Throughout the duration of any pre-trip test except the P-7 high pressure switch tests, the current and pres-sure limiting processes are active.Pre-Trip Test ResultsAt the end of the pre-trip test selection menu, the message “P”, “rSLts” (pre-trip results) will bedisplayed. 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 sincepower 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 reactivatedmanually if required.5.9 OBSERVE UNIT OPERATION5.9.1 Crankcase HeaterWhen the crankcase heater is installed, it will be operational whenever the compressor is off and there is power tothe unit. The heater is connected to a set of normally closed auxiliary contacts on the compressor contactor.5.9.2 Probe CheckIf the DataCORDER is off or in alarm mode, the controller will revert to a four probe configuration, which includesthe DataCORDER supply and return air probes as the secondary controller probes. The controller continuouslyperforms probe diagnosis testing, which compares the four probes. If the probe diagnosis result indicates a probeproblem exists, the controller will perform a probe check to identify the probe(s) in error. |
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