Withdrawal of vapor from the high side is preferred because it prevents entering the recovery device of what?

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Vapor recovery devices are designed to handle refrigerant in vapor form. Pulling from the high side keeps liquid refrigerant from being drawn into the recovery unit. If liquid enters the recovery device, it can cause slugging and damage the compressor and other components, and it can reduce recovery efficiency. Noncondensable gases, oil, or moisture are concerns too, but the primary reason to withdraw vapor from the high side is to prevent liquid refrigerant from entering the recovery device.