Patent ID: 7895852
Filing Date: 2011-03-01
Classification: F25B,Y02B

Abstract:
1. A method of controlling a circuit in a vapor compression system, the circuit comprising a tank, a first line connecting the tank and a first heat exchanger, a second line connecting the tank and a second heat exchanger, a third line connecting the tank and a port in a compressor of the vapor compression system, and a valve configured and positioned in the third line to regulate fluid flow in the third line, the method comprising: measuring a level of liquid in the tank; comparing the measured level of liquid to a predetermined liquid level; measuring an operating parameter of the compressor; comparing the measured operating parameter to a first predetermined value related to the operating parameter; opening the valve in response to the measured level of liquid being less than the predetermined liquid level and the measured operating parameter being greater than the first predetermined value; comparing the measured operating parameter to a second predetermined value related to the operating parameter; and closing the valve in response to the measured operating parameter being less than the second predetermined value.