Patent ID: 6990826

Claim:
A beat pump comprising: a compressor, an outdoor heat exchanger and an indoor heat exchanger, and a first flow control device for selectively routing refrigerant from said compressor to said outdoor heat exchanger when said heat pump is operating in a cooling mode, and for routing refrigerant to said indoor heat exchanger when said heat pump is operating in a heating mode, refrigerant flowing from either of said indoor and said outdoor heat exchangers to a second flow control device, and said second flow control device being positioned to receive refrigerant from said outdoor heat exchanger when said heat pump is operating in a cooling mode, and from said indoor heat exchanger when said heat pump is operating in a heating mode, and route said refrigerant through a common expansion device, refrigerant passing through said common expansion device and back through said second flow control device to said indoor heat exchanger when said heat pump is operating in said cooling mode, and to said outdoor heat exchanger when said heat pump is operating in said heating mode, said refrigerant then passing through said first flow control device and back to said compressor; a suction line receives refrigerant from said first flow control device and delivers said refrigerant to a suction port of said compressor and wherein an expansion device sensor is placed on said suction line, said expansion device sensor communicating with said common expansion device.