Pretrip
Run the automated pre-trip inspection 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 the unit is running when Pretrip is started, it will shut down for the first three tests, then restart as it proceeds. • 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 "CAN NOT START PRETRIP" is displayed in the MessageCenter, check for: PC mode (Section 5.3.2), Defrost mode running, or active shutdown alarms (Section 3.16). Clear these conditions before attempting Pretrip again.
With the 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 (15 second timeout). Press the ▲ or ▼ key to select "Start Pretrip", then press the "=" key.
Pretrip begins and the Pretrip Status screen is displayed. The percent completed is shown in the status bar under the test description.
During Pretrip the ALARM light will illuminate to indicate there is no temperature control. This is normal.
At any time during Pretrip, press the UNIT DATA soft key to view the unit data screen (Section 3.15). Press the BACK soft key to return to Pretrip.
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 5 seconds and requires you to determine PASS or FAIL.
Anything that fails during Test 1 should be repaired at the conclusion of the Pretrip cycle. Pretrip will continue regardless of the outcome of this test.
The remaining tests run automatically and take approximately 7 to 25 minutes to complete.
At the end of testing one of the following is displayed: • "PRETRIP PASS" — displayed until a key is pressed • "PRETRIP FAIL IN TEST ##" — Pretrip was aborted by an alarm before completion • "PRETRIP FAILED AND COMPLETE" — entire cycle completed with failures
Press the VIEW ALARMS key to move to the Alarm Screen (Section 3.16) and review any alarms activated during the test. The FAIL results message will display until alarms are cleared.
Press the TEST RESULTS soft key at any time during Pretrip to view results of completed tests. Press the ▲ or ▼ key to scroll through the results.
To end Pretrip at any time, press the STOP PRETRIP soft key.
Pretrip runs up to 14 tests: • Test 1 — Display test (buzzer and light bar) • 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 — Check Suction Modulation Valve (CSMV) • Test 11 — Evaporator Expansion Valve (EVXV) • Test 12 — Economizer Expansion Valve (ECXV) • Test 13 — Liquid Injection Solenoid Valve (LIV) • Test 14 — Remote Evaporator Expansion Valves (REVXVs)
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 APX Control System checks alarm status. If certain alarms are active (e.g., Low Fuel Warning, Check Engine Oil Level, Check Coolant Temperature), Pretrip will display "FAILED". Check the alarm list and correct all present alarm situations.
When the Pretrip cycle is completed, the unit returns to normal temperature control operation. Press the EXIT key to dismiss the PRETRIP PASS message.