Pretrip

• Current unit settings are saved and restored at the end of the Pretrip Test or if the unit is turned off and back on.

• Pretrip Test can be run in either Diesel or Electric Mode.

• The unit will auto switch from Diesel to Electric Mode or from Electric to Diesel Mode during a Pretrip Test if these features are enabled and the auto-switch conditions occur.

• If any Shutdown Alarms are present. Pretrip tests are allowed with some Check and Log Alarms.

• If the unit is in Sleep Mode.

• If the unit is in Service Test Mode, Interface Board Test Mode, or Evacuation Mode.

Pretrip tests proceed in the order shown below. A Full Pretrip Test includes all tests. A Running Pretrip Test is started with the engine or electric motor running and does not include the Amp Checks or Engine Start Check.

• 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 as PASS, CHECK, or FAIL when the Pretrip Test is completed. If test results are CHECK or FAIL, alarm codes will exist to direct the technician to the source of the problem.

When performing a Pretrip Test, the following issues should be considered:

• If running a Pretrip Test on a truck loaded with dry cargo, verify proper airflow can occur around the load. If the load restricts airflow, false test results may occur. Also, SR-3 units have high refrigeration capacity which results in rapid temperature changes. 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 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 a Pretrip Test.

• Always perform Pretrip Tests with the truck cargo doors closed to prevent false test failures.

If a Pretrip Test is initiated with the engine shut down, a Full Pretrip Test will be performed. If a Pretrip Test is initiated with the engine or electric motor running, a Running Pretrip Test is performed.

• Before initiating a Pretrip Test, clear all alarm codes.

• To stop a Pretrip Test at any time, turn the unit off. Alarm Code 28 Pretrip Abort will be set. Other alarms may also be set depending upon test in progress when the test was terminated.

Pretrip Tests are initiated using the Pretrip Menu. From the Standard Display, press the MENU key.

The Language Menu or Alarm Menu will appear. Press the NEXT key as required to display the Pretrip Menu. When the Pretrip Menu is shown, press the SELECT key.

If the unit is not running, a Full Pretrip Test will be initiated. If the unit is running in either diesel or electric mode, a Running Pretrip will be performed.

If all alarms were not cleared, a prompt appears as shown ( No Pretrip Prompt). Exit the Pretrip Test, clear all alarms, and restart the Pretrip Test.

If no alarms are present, the Pretrip Test display appears.

• The top line of the display indicates the unit is performing the non-running portion of the Pretrip Test.

• The second line measures test progress. The number of tests completed of the total number of tests to be performed is shown. In the example ( Pretrip Test Display), the unit is performing Test 1 of 26, Sensor Check.

• The soft keys may be used during the Pretrip Test to select the Hourmeter, Gauge, or Sensor Menus.

• To stop a Pretrip Test at any time, turn the unit off. This will generate Alarm Code 28 Pretrip Abort. Other alarm codes may also be generated. This is normal when the Pretrip Test is halted before completion.

When the non-running tests are complete, the unit will start automatically and continue with the Running Pretrip Test. In the example shown ( Performing Cool Test), the unit is in the Running Pretrip and is performing Test 21 of 26, Cool Test.

When all tests are complete, the results are reported as PASS, CHECK, or FAIL. If the results are CHECK or FAIL, the accompanying alarm codes will direct the technician to the cause of the problem. If the Pretrip Test results are CHECK or FAIL, the problem should be diagnosed and corrected before the unit is released for service.