Vacuum Pumping
Vacuum pumping
Note! The illustrations in this service information are used for different model years and/or models. Some variation may occur. However, the essential information in the illustrations is always correct.
Preparatory work
Preparing the service valve on the high pressure side (HP)
Warning! Follow the safety instructions for work on air conditioning systems.
The service valve on the high pressure side (HP) is hidden under the cover plate above the air conditioning aggregate.
Remove:
- the 2 screws in the right-hand part of the cover plate by the rubber (A) for vertical adjustment of the hood
- the 1 screw holding the air intake (B). Remove the air intake.
Lift up the plate so that the service valve is accessible.
Vacuum pumping
Vacuum pumping the air conditioning (A/C) system
Caution! Check and top up with fresh compressor oil as required. See: AC-system, oil, refilling AC-System, Oil, Refilling before vacuum-pumping the climate control unit.
During vacuum pumping, it is recommended that the vacuum pump is connected to the service valves for both the high pressure (HP) and low pressure (LP) sides.
Operate the vacuum pump for at least 50 minutes.
Note! The vacuum pump (recycling station) must have a final pressure lower than 0.1 mbar.
Vacuum test
Vacuum testing the air conditioning (A/C) system
The value of the vacuum gauge may only increase by 0.1 - 0.3 mbar during an interval of 4 minutes.
Note! The vacuum test is not a substitute for leak tracing.
Finishing
Finishing work on the service valve on the high pressure side (HP)
Disconnect the refrigerant connection from the service valve.
Screw the service valve cap into place.
Position the cover plate.
Insert the air intake and the screw (B). Tighten.
Screw the right-hand part of the cover plate using 2 screws (A) by the rubber for vertical adjustment of the hood. Tighten.
Filling with refrigerant
Fill refrigerant via the service valve on the low pressure side (LP) as required. See: Refrigerant, filling Refrigerant, Filling.