Patent ID: 11892215
Assignee: A. O. SMITH CORPORATION
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F | IPC F

Claim 11:
12. The control method according to claim 11, wherein the heat pump unit has a water pump for driving water to flow; and
wherein the control method further comprises:
determining the actual return water temperature attic heat pump unit in the heating mode is not lower than the set return water temperature or determining the actual return water temperature in the cooling mode is not higher than the set return water temperature;
determining there is an indoor area having a heating demand or a cooling demand; and
shutting down the compressor and maintaining the water pump to operate in response to: (i) determining the actual return water temperature of the heat pump unit in the heating mode is not lower than the set return water temperature or determining the actual return water temperature in the cooling mode is not higher than the set return water temperature, and (ii) determining the indoor area has the heating demand or the cooling demand.