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23| AC442| Maintenance
10.3 Self test
t
This test is designed to check the internal AC442 circuit for
any leaks.
To perform Self test:
1. From the MAINTENANCE menu, scroll until SELF TEST
is highlighted and press.
2. Allow unit to perform test to completion.
If a test fails, check charge hoses and quick couplers for
leaks first. If repair is possible, fix the leak and repeat
test.
10.4 Pressure zero
This function allows technician to determine and store the
atmospheric pressure value.
This procedure should be performed everytime the
AC442 is moved from one location to another that has
a different altitude
1.
From the MAINTENANCE menu, scroll until PRESSURE
ZERO is highlighted and press arrow.
10.5 Counters
These screens will display the vacuum pump and
compressor hours of life and the remaining time before
vacuum pump oil and the filter dryer need replacement.
1. From the MAINTENANCE menu, scroll until
MAINTENANCE COUNTERS is shown and make selection.
2. Press to display all counters.
Fig. 26: Maintenance counters
10.6 Long life pump test
The Long Life Pump function equipped on the AC442
enables the unit to optimize the vacuum pump oil use and
avoid the need to replace after every 60 hours of operation.
1.
After the first 60 hours of vacuum pump operation, check
the vacuum pump oil level and top off if necessary.
2. From the MAINTENANCE menu, scroll until LONG
LIFE PUMP TEST is highlighted and press arrow.
3. The process will run for approximately 1 hour.
During this process, the vacuum pump oil is automatically
purified from the gaseous residues absorbed by the oil
during the vacuuming of vehicle A/C systems.
4. At end of procedure, vacuum pump performance check is
executed and the result is displayed on the display.
If the result of the Long Life Pump test is negative, the oil
must be changed.
If the results pass, the pump oil remaining time will change
to 1000 hours. After 1000 hours of runtime, the oil must be
changed.
1901016-85
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