Thermo King 098203, Maintenance Manual

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PTI (Pretrip) Tests
NOTE: Units equipped with a water-cooled condenser must be set to operate on air-cooled condensing
to perform a complete system capacity test.
The MP-4000 controller contains special PTI pretrip tests that automatically checks unit refrigeration
capacity, heating capacity, temperature control, and individual components including the controller
display, contactors, fans, protection devices and sensors. The test includes measurement of component
power consumption and compares test results to expected values.
The Full PTI test takes up to 2 to 2.5 hours to complete, depending on the container and ambient
temperature.
The Brief PTI test takes about 25-30 minutes to complete, depending on the container and ambient
temperature.
NOTE: Correct all existing alarm conditions and clear the alarm codes before performing a Full PTI
test. The controller will automatically clear all existing alarms before beginning the Full PTI test.
With the Unit turned On, Allow Unit to start and stabilize and the Display to show the unit status display
(setpoint):
1. Press the PTI K
EY
to open the PTI Menu.
2. Press the F2 OR F3 UP/DOWN K
EY
to scroll to “PTI” (or another desired test).
3. Press the F4 ENTER K
EY
to start the selected test. Display shows test currently being performed. the
PTI test ends automatically. Press any key on the controller to return the unit to normal operation.
Detailed PTI test results are stored in the MP-4000 Datalogger for later viewing. Any alarm codes
recorded during the test can be viewed through the controller’s Alarm List menu at the end of the test.
Figure 81: Defrost Screen Figure 82: Defrost Information Screen
CAUTION: The PTI tests should only be performed on an empty container!