Zell AC1800, Operation Manual

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7.
Press button to stop the alarm buzzer,or press button to
print,then the recovery process finished!
7.2 Vacuum and Vacuum Test
Vacuum operation is the process that the Air-Con Service Station evacuate
the vehicle A/C system into a vacuum state. The small quantity gases are
exhausted outside. In the process, the pressure inside the A/C changes from the
relative zero to absolute zero.
There is a vacuum test function after the operation, which is a easy way to
check if there exist some leakage in the A/C system.
The equipment could automatically detect the pressure is suitable or not
for operation.the Max beginning pressure should less than -0.2 bar.