Waeco AirCon Oil Checker R134a Installation And Operating Manual page 17

Oil Checker
➤ Connect the low-pressure quick coupling (fig. 1 4, page 3) with the low-
pressure connection of the air conditioner.
5.3 Checking the refrigerant oil/refrigerant
➤ Start the vehicle engine.
➤ Switch the air condition on for at least 5 minutes and then keep it on.
➤ Hold the sight glass (fig. 2 3, page 3) vertical (blue at the top).
A
NOTICE!
Only gaseous refrigerant may be fed to the compressor through
the low-pressure side.
If liquid refrigerant gets into the compressor, the compressor may
be damaged.
 Make sure that the level of the refrigerant oil in the sight glass
is never too high.
➤ Open and close the high-pressure shut-off valve (red) (fig. 2 5, page 3)
slowly until the desired liquid level is achieved.
➤ Open and close the low-pressure shut-off valve (blue) (fig. 2 1, page 3)
slowly until the desired liquid level is achieved.
The refrigerant oil is drawn into the sight glass. The refrigerant and compres-
sor oil are separated in the process. If bubbles form, close the low-pressure
shut-off valve (blue) far enough until the bubbling stops.
➤ Allow the sight glass to be filled no more than half.
➤ Close both control elements.
➤ Evaluate the quality of the oil using the color on the pH indicator as shown
in the table below:
Color
Red
Orange
Light yellow
Yellow
EN
Meaning
Very acidic
Normal condition
Using the oil checker
Action
Replace the refrigerant oil.
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