Pretrip Submenu (Single Temperature Unit Only)

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

• A 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.

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

• 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, Output Test Mode, or Evacuation Mode.

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

• If running a Pretrip Test on a trailer loaded with dry cargo, verify that proper airflow can occur around the load. If the load restricts airflow, false test results may occur. Also, these 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 trailer that has just been washed down, the extremely high humidity inside the trailer may result in false test results.

• If running a Pretrip Test on a trailer 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 trailer cargo doors closed to prevent false test failures.

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.

• Engine Start - The Engine will start automatically.

• ETV Test - The ETV functionality is checked by closing and opening the ETV and determining an expected change in suction pressure.

• Speed Test - The expected RPM for engine speed, condenser fan speed, and evaporator fan speed in a high and low speed is checked.

• Cool Test - The ability of the unit to cool is checked.

• Heat Test - The ability of the unit to heat is checked.

• Defrost Test - If the coil temperature is below 14 °C, a defrost cycle is initiated.

• Cool Return Test - The ability of the unit to return to cool is checked.

• Report Test Results - The test results are reported as COMPLETED or FAIL when the Pretrip Test is completed. If test result is FAIL or if the unit did not PASS each test step, alarm codes will exist to direct the technician to the source of the problem.

Pretrip tests proceed in the order shown below. A Full Pretrip Test includes all tests. A Running Pretrip Test is started with the electric motor running.

• ETV Test - The ETV functionality is checked by closing and opening the ETV and determining an expected change in suction pressure.

• Cool Test - The ability of the unit to cool is checked.

• Heat Test - The ability of the unit to heat is checked.

• Defrost Test - If the coil temperature is below 14 °C, a defrost cycle is initiated.

• Cool Return Test - The ability of the unit to return to cool is checked.

• Report Test Results - The test results are reported as COMPLETED or FAIL when the Pretrip Test is completed. If test result is FAIL or if the unit did not PASS each test step, alarm codes will exist to direct the technician to the source of the problem.