Evacuating refrigerant circuit with air conditioner service station |
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| The work procedure must always be performed as described in the operating instructions of the air conditioner service station. |
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| Quantity of refrigerant oil in refrigerant circuit checked and if necessary corrected → Chapter. |
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| Quantity of refrigerant in air conditioner service station checked |
The refrigerant circuit must be evacuated before it is filled with refrigerant. In addition, moisture is removed from the circuit. |
Leaks can be detected on evacuating the refrigerant circuit. |
Caution t
| Do not start the engine during the evacuating procedure and while there is a vacuum in the refrigerant circuit. |
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| The air conditioner compressor may be damaged if the engine is started whilst there is a vacuum in the refrigerant circuit. |
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| Always charge the refrigerant circuit before starting the engine. |
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| Connect air conditioner service station to power supply. |
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| Screw in the handwheel of the quick-release coupling adapters to the extent required to reliably open the valves of the service connections (take care not to open the valve too far). |
Note If you intend to measured the pressure on only one side of the refrigerant circuit after charging the system (on vehicles with a service connection), use the valve adapter and filler hose with valve opener → Chapter. |
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| Switch on air conditioner service station and evacuate refrigerant circuit for at least 30 minutes. In this process, the pressure reading must be less than 10 mbar absolute (corresponding to a vacuum of 990 mbar). |
Note On the air conditioner service station V.A.G 1885 (for currently available air conditioner service stations, refer to → V.A.G workshop equipment catalogue), the two green LEDs light at this pressure for example. |
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| Switch off the air conditioner service station and allow to stand for at least 1 hour. |
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| If the vacuum display (LED chain) does not change, the system is free of leaks and can be charged. |
Note t
| With V.A.G 1885 for example (for currently available air conditioner service stations, refer to → V.A.G workshop equipment catalogue), a current vacuum display (LED) is only obtained after pressing the Evacuation button again. |
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