1. Clean the refrigerant of the air conditioner;
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2. Vacuum the air conditioner;
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3. Connect the air conditioner refrigerant charging valve with the refrigerant oil using a hose;
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4, put the refrigerant oil on the electronic scale (or pointer);
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5. Open the charging valve;
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6. The air conditioner automatically pumps oil until the amount of oil meets the requirements;
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7. Close the charging valve;
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8. Fill the air conditioner with refrigerant.