If a large enough recovery tank is connected, a dehumidifier or air conditioner unit will pull down its low side below atmospheric pressure pretty quickly. A capillary tube doesn't care whether it is fed liquid or gas. As long as you keep the recovery cylinder cool and empty enough, it will literally suck the juice out of the high side.
The big thing not to do in this operation is flood the compressor with liquid refrigerant. If one were to draw from the donor system too quickly, the compressor could not keep up. Liquid would be ingested and all bets are off at that point.
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