PTI (Pretrip) Test
- Caution
- Service procedure
- The PTI test should only be performed on an empty container!
The CRR DF controller contains a special PTI pretrip test that automatically checks unit refrigeration capacity, heating capacity, 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.
Note Correct all existing alarm conditions and clear
the alarm codes before performing a PTI test. The controller will
automatically clear all existing alarms before beginning the PTI test.
During the PTI test, the LED display screen will show:
-
Alarm LED flashes if an alarm condition occurs during the test.
Note Detailed PTI test results are stored in the 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.
Note Auto PTI test omits HPCO test on R134a and R23 compressor,
and cooling capacity is not verified by minimum temp difference between
supply and return. Manually verify function HPCO functions and full
cooling capacity.