Abstract: A method and apparatus to remove liquid from a chamber (B) of sub-atmospheric pressure in an air conditioning system wherein a liquid removal conduit (28) is connected to communicate with a chamber of sub-atmospheric pressure and with a condensate disposal place. Air at a pressure above ambient pressure, is delivered through an air line (30) into the flow control (10) between the chamber of sub-atmospheric pressure and the condensate disposal place. The flow rate of air into the liquid removal conduit (10) is controlled to permit flow of liquid through the conduit toward the condensate disposal place while preventing flow of gas through the conduit toward the chamber (A) of sub-atmospheric pressure. The flow rate of gas is controlled by a valve (48) in an air line (30) connected to the conduit (28) and by forming a tortuous path 50(a), 50(b), 50(c), and 50(d) in the flow control (10) to induce a loss in gas pressure without restricting flow of liquid.