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In the general automotive air-conditioning system refrigerant added process, the vacuum is the most crucial step. Vacuum is not only the air-conditioning systems in order to remove the gas and, more importantly, through the vacuum system to remove moisture. Because the water in the atmosphere under the pressure of the boiling point is 100 ℃, and in a vacuum of low pressure, even at room temperature of 20 ℃ boiling water also help. Therefore, the vacuum system will allow the water evaporated quickly, so as to achieve complete drying of the purpose of air-conditioning systems.

In a vacuum state, corresponding to different pressure of the drying system is not the same as the degree. In general, the vacuum the lower the pressure, the system will be dry. However, in order to enable the system to lower the pressure needed for the longer vacuum. Vacuum air-conditioning process, most of the time are used to dry the system.

Add refrigerant auto vacuum machine is normally provided by a vacuum system, and the refrigerant pressure input control system, add refrigerant metering system, electronic control system components, etc., to be completed by the automotive air-conditioning systems vacuum, leak detection accurate quantitative work, etc. added refrigeration.