Patent ID: 6931871
Filing Date: 2005-08-23
Classification: F25B,F25D,Y02B

Abstract:
1. A heat pump system including: a primary compressor; a booster compressor; a refrigerant conduit system, said primary compressor and said booster compressor being in series in said refrigerant conduit system; a control panel, said control panel being connected between a multi-step thermostat and said primary and booster compressors, said control panel receiving signals from the multi-step thermostat and delivering power to operate said primary compressor and said booster compressor in a predetermined sequence in response to steps of the thermostat; and at least one pressure sensor connected to said refrigerant conduit system for sensing refrigerant pressure at approximately the refrigerant low pressure side to generate signals to prevent or permit operation of said primary compressor or said booster compressor as a function of outdoor ambient temperature.