Thermo King UT-1200, Manual

Page: 72 / 169

Operating Instructions for Premium HMI Control Panel
72
• RPM Check - The engine RPM in high and
low speed is checked during the Cool Check.
• Cool Check - The ability of the unit to cool in
low speed is checked.
• Heat Check - The ability of the unit to heat in
low speed is checked.
• Report Test Results - The test results are
reported as PASS, CHECK or FAIL when the
Pretrip Test is completed. If test results are
CHECK or FAIL alarm codes will exist to
direct the technician to the source of the
problem.
Pretrip Test Considerations
When performing a Pretrip Test, the following
issues should be considered.
• If running a Pretrip Test on a truck or trailer
loaded with dry cargo, insure that proper
airflow can occur around the load. If the load
restricts airflow, false test results may occur.
Also, SR-3 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 truck or trailer
that has just been washed down, the extremely
high humidity inside the truck or trailer may
result in false test results.
• If running a Pretrip Test on a truck or trailer
loaded with sensitive cargo, monitor the load
temperature during the test as normal
temperature control is suspended during a
Pretrip Test.
• Always perform Pretrip Tests with the truck or
trailer cargo doors closed to prevent false test
failures.
Performing a Pretrip Test
If a Pretrip Test is initiated with the engine shut
down a Full Pretrip Test will be performed. If a
Pretrip Test is initiated with the engine or motor
running a Running Pretrip Test is performed.
• Before initiating a Pretrip Test, clear all alarm
codes.
• To stop a Pretrip Test at any time, turn the unit
off. Alarm Code 28 Pretrip Abort will be set.
Other alarms may also be set, depending upon
test in progress when the test was terminated.
Pretrip Tests are initiated using the Pretrip Menu.
From the Standard Display, press the MENU key.
.
Figure 128: Menu Key
The Language Menu or Alarm Menu will appear.
Press the NEXT key as required to display the
Pretrip Menu. When the Pretrip Menu is shown
press the SELECT key.
Figure 129: Select Key
If the unit is not running a Full Pretrip Test will be
initiated. If the unit is running in either diesel or
electric mode a Running Pretrip will be
performed.
Figure 130: Running Pretrip
If all alarms were not cleared a prompt appears as
shown in Figure 131. Exit the Pretrip Test, clear
all alarms and restart the Pretrip Test.
Figure 131: No Pretrip Prompt
If no alarms are present, the Pretrip Test display
appears.