Patent ID: 11927377
Assignee: WATERFURNACE INTERNATIONAL, INC.
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 11:
12. A method of controlling a heat pump system, comprising:
toggling a reversing valve to effect one of a heating mode and a cooling mode, the reversing valve being disposed between a variable speed compressor, a load heat exchanger, and a source heat exchanger on a refrigerant circuit, the load heat exchanger being configured to exchange heat between a refrigerant and a load, the source heat exchanger being configured to exchange heat between the refrigerant and a source;
determining a first refrigerant pressure in a first pressure sensing line fluidly connecting an electronic economizer expansion valve (EEEV) to a vapor injection inlet of the variable speed compressor;
controlling the EEEV based on the first refrigerant pressure, the EEEV being disposed on an economizer circuit between a diverter of the refrigerant circuit and an economizer heat exchanger of the economizer circuit, the diverter being configured to divert a portion of the refrigerant from the refrigerant circuit to the economizer circuit, the economizer heat exchanger being configured to exchange heat between the refrigerant diverted to the economizer circuit and the refrigerant in the refrigerant circuit,
determining a second refrigerant pressure in a second pressure sensing line fluidly connecting an electronic primary expansion valve (EPEV) to a compressor inlet;
controlling the EPEV based on the second refrigerant pressure, the EPEV being disposed on the refrigerant circuit between the diverter and the source heat exchanger to:
meter the refrigerant discharged from an active economizer heat exchanger to the source heat exchanger in the heating mode, and
meter the refrigerant discharged from the source heat exchanger to an inactive economizer heat exchanger in the cooling mode.