Thermo King T-1000R, Maintenance Manual

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Operating Instructions Standard HMI 7-14
PRETRIP TEST
A Pretrip Test verifies unit operation. The PRETRIP Key allows either a Full Pretrip Test or an Engine Running Pretrip Test to
be initiated by the operator.
Pretrip Test Conditions
• The current unit settings are saved and restored at the end of the Pretrip Test or if the unit is turned off and back on.
• The Pretrip Test can be run in either Diesel or Electric Mode.
• The unit will auto switch from Diesel Mode to Electric Mode or from Electric Mode to Diesel Mode during a Pretrip Test if these features
are enabled and the auto switch conditions occur.
Conditions where Pretrip Tests are not allowed
• Pretrip Tests are not allowed if any shutdown alarms are present.
• Pretrip tests are allowed with some Check and Log alarms present.
Pretrip Test Sequence
Pretrip tests proceed in the order shown below.
Full Pretrip Test
Full Pretrip Tests include all of the tests shown below.
• Amp Checks - Each electrical control component is energized and the current drawn is confirmed as within specification.
• Engine Start - The Engine will start automatically.
• Defrost - If the coil temperature is below 45 F (7 C), a defrost cycle is initiated.
• RPM Check - The engine RPM in high and low speed is checked during the Cool Check.
• Cool Check - The ability of the unit to cool in low speed is checked.
• Heat Check - The ability of the unit to heat in low speed is checked.
• Report Test Results - The test results are reported when the Pretrip Test is completed.
• If the unit passes the Pretrip Test, the amber Pretrip Test LED will turn off at the completion of the test, it will revert to the
Standard Display, the Alarm Icon will not be displayed, and the unit will continue to run as required. This signifies that the
unit passed the Pretrip Test.
• If the Pretrip Test fails, alarm codes will exist to direct the technician to the source of the problem.
Engine Running Pretrip Test
Engine Running Pretrip Tests include all of the tests shown below. They do not include the Amps Check or the Engine Start
tests.
• Defrost - If the coil temperature is below 45 F (7 C), a defrost cycle is initiated.
• RPM Check - The engine RPM in high and low speed is checked during the Cool Check.
• Cool Check - The ability of the unit to cool in low speed is checked.
• Heat Check - The ability of the unit to heat in low speed is checked.
• Report Test Results - The test results are reported when the Pretrip Test is completed. If the Pretrip Test fails, alarm codes will exist to direct
the technician to the source of the problem.
Pretrip Test Considerations
When performing a Pretrip Test, the following issues should be considered.
• Whenever possible, run the Pretrip Test with an empty truck box.
• If running a Pretrip Test on a truck loaded with dry cargo, insure that proper airflow can occur around the load. If the load restricts airflow,
false test results may occur. Also, units have high refrigeration capacity which results in rapid temperature change. Sensitive dry cargo may
be damaged as a result.
• If running a Pretrip Test on a truck that has just been washed down, the extremely high humidity inside the truck box may result in false test
results.
• If running a Pretrip Test on a truck loaded with sensitive cargo, monitor the load temperature during the test as normal temperature control
is suspended during pre-trip operation.
• Always perform Pretrip Tests with the cargo doors closed to prevent false test results.