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Vacuum pumping

Vacuum pumping


Make sure that the amount of compressor oil in the AC system is correct before starting vacuum pumping and filling. See the table in this section.

Important

Vacuum pumping of the system should be carried out on both the low-pressure and high-pressure sides simultaneously. A non-return valve in the inlet on the compressor's low-pressure side makes vacuum pumping on only one side impossible.



1. Using a snap-on coupling, connect the blue low-pressure hose to the low-pressure side of the AC system.

2. Using a snap-on coupling, connect the red high-pressure hose to the high-pressure side of the AC system.

3. Open the valves on both snap-on couplings by screwing in the knobs.

4. Connect the yellow hose on the pressure-gauge stand's middle outlet to the refrigerant flask.

5. Open the cocks on the blue low-pressure hose and red high-pressure hose on the pressure-gauge stand.

6. Start the vacuum pump.

7. Open the vacuum valve and let the pump run for 30 minutes.

8. Close the vacuum valve when vacuum pumping is finished after about 30 minutes. The pressure should then be 0-10 mbar.

9. Switch off the pump.

10. Move the AC hoses slightly and make sure that there are no leaks in the system. The pressure must not increase by more than 10 mbar in five minutes.