Pretrip
Run the automated pre-trip inspection test on the unit
Pretrip is a set of tests run by the control system to check unit operation. It is recommended that a Pretrip is run prior to loading the refrigerated compartment. A Pretrip can be started at any box temperature.
If Pretrip is started while the unit is in a Start-Stop off cycle, the unit will start during the course of the test. If the unit is running when Pretrip is started, it will shut down for the first three tests, then start again as it proceeds through the remaining tests.
Pretrip will run until completed unless an alarm occurs that causes it to be aborted. Only alarms that would result in other erroneous alarms or affect future Pretrip tests will abort Pretrip.
Before completing Pretrip, the control system checks the status of alarms. If certain alarms are active (for example: Low Fuel Warning, Check Engine Oil Level, Check Coolant Temperature), Pretrip will display "FAILED", indicating the alarm list should be checked and all alarm situations corrected.
With the system powered up (START/RUN-OFF switch in the START/RUN position), press the MENU key until PRETRIP is displayed.
Press the PRETRIP soft key to display the Pretrip Menu screen (displays with a 15-second timeout). Press the ▲ or ▼ key to select "Start Pretrip", then press the "=" key. Pretrip will begin and the Pretrip Status screen will be displayed.
At any time during Pretrip, press the UNIT DATA soft key to view the unit data screen. To return to Pretrip, press the BACK soft key.
During Pretrip the ALARM light will illuminate to indicate there is no temperature control. This is normal.
During Pretrip Test 1, verify that the buzzer is energized and the amber light on the light bar is illuminated (if equipped). This test lasts five seconds and requires you to determine PASS or FAIL.
The remainder of the Pretrip tests will run automatically and take 7 to 15 minutes. The percent completed is displayed in the status bar under the test description.
"PRETRIP PASS", "PRETRIP FAIL IN TEST ##", or "PRETRIP FAILED AND COMPLETE" will be displayed at the end of testing. The "PASS" message displays until a key is pressed. The "FAIL" message displays until alarms are cleared.
Press the VIEW ALARMS key to move to the Alarm Screen and review any alarms activated during the test.
The TEST RESULTS soft key may be pressed at any time during Pretrip to view results of any completed test. Press the ▲ or ▼ key to scroll through the results.
To end Pretrip at any time, press the STOP PRETRIP soft key.
The Pretrip checks: • Test 1 — Display test (buzzer and amber light verification) • Test 2 — 12VDC electrical component amperage check • Test 3 — Temperature sensor check • Test 4 — Engine low speed (Engine Operation only) • Test 5 — Engine high speed (Engine Operation only) • Test 6 — Engine return to low speed (Engine Operation only) • Test 7 — Electric heater amperage check (Electric Operation only) • Test 8 — Evaporator fan motor check • Test 9 — Condenser fan motors check • Test 10 — Suction modulation valve (CSMV) check • Test 11 — Evaporator expansion valve (EVXV) check • Test 12 — Economizer expansion valve (ECXV) check • Test 13 — Liquid injection solenoid valve (LIV) check
Tests 4, 5, and 6 are only run when the unit is in Engine Operation. In Electric Operation, Test 7 (Electric Heater Amperage Check) is run instead, and the engine tests are skipped.
When the Pretrip cycle is completed, the unit returns to normal temperature control operation. Press the EXIT key to dismiss the "PRETRIP PASS" message.
If "CAN NOT START PRETRIP" is displayed in the MessageCenter, check to see if the unit is in PC mode or Defrost mode, or check the alarm list for active shutdown alarms. Clear these conditions before attempting Pretrip again.