Inventors:
Roger J. Voorhis - Liverpool NY
Assignee:
Carrier Corporation - Syracuse NY
International Classification:
F25B 4106
Abstract:
A heat pump system comprising a compressor, two heat exchangers, and an expansion device. The expansion device defines two, spaced apart flow passages. A first piston is located in a first flow passage for metering refrigerant flow therethrough at a first flow rate, and a second piston is located in the second flow passage for metering refrigerant flow therethrough at a second flow rate less than the first flow rate. The expansion device includes a valve having a first position, closing the second flow passage to direct refrigerant through the first flow passage, and a second position, closing the first flow passage to direct refrigerant through the second flow passage.