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

Claim 0:
1. A heat pump system for heating and cooling a space, comprising:
a refrigerant circuit through which refrigerant is configured to flow;
a compressor disposed on the refrigerant circuit, the compressor being a variable speed compressor, the compressor including a compressor inlet, a compressor outlet, and a vapor injection inlet disposed between the compressor inlet and the compressor outlet;
a load heat exchanger disposed on the refrigerant circuit to exchange heat between the refrigerant and a load;
a source heat exchanger disposed on the refrigerant circuit to exchange heat between the refrigerant and a source;
a reversing valve disposed on the refrigerant circuit between and configured to route the refrigerant between the compressor, the load heat exchanger, and the source heat exchanger to effect a heating mode and a cooling mode;
a diverter disposed on the refrigerant circuit between the load heat exchanger and the source heat exchanger, the diverter configured to divert a portion of the refrigerant to an economizer circuit in the heating mode and none of the refrigerant in the cooling mode, wherein the economizer circuit includes:
an economizer heat exchanger configured to exchange heat between the refrigerant diverted to the economizer circuit and the refrigerant in the refrigerant circuit, and
an electronic economizer expansion valve (EEEV) disposed between the diverter and the economizer heat exchanger; and

an electronic primary expansion valve (EPEV) disposed on the refrigerant circuit between the diverter and the source heat exchanger, wherein the EPEV is configured to receive the refrigerant from the economizer heat exchanger and discharge the refrigerant to the source heat exchanger in the heating mode, and
wherein the EPEV is configured to receive the refrigerant from the source heat exchanger and discharge the refrigerant to the economizer heat exchanger in the cooling mode.