Patent ID: 11879650
Assignee: DAIKIN INDUSTRIES, LTD.
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 0:
1. An air conditioning system comprising:
an indoor fan that sends air into a room through an air-blowing flow path;
a heat pump unit having a refrigerant circuit of vapor compression, wherein the refrigerant circuit has a refrigerant heat exchanger that exchanges heat between a refrigerant and the air, the refrigerant heat exchanger is arranged in the air-blowing flow path, and the heat pump unit air-conditions the room with the refrigerant circuit;
a separate heat source unit having a furnace that is arranged in the air-blowing flow path and heats the air by burning fuel, or an electric heater that heats the air with heat generated by energization, wherein the separate heat source unit air-conditions the room with the furnace or the electric heater; and
a controller is configured to control an operation of the indoor fan, the heat pump unit, and the separate heat source unit, wherein
as the refrigerant, a flammable refrigerant is sealed in the refrigerant circuit, and
the controller is configured to control air conditioning in the room with the separate heat source unit by
starting operation of the indoor fan at a first time, before causing an operation for burning the fuel in the furnace or causing an operation for generating heat by energization in the electric heater, and
initiating an operation for burning fuel in the furnace or initiating an operation for generating heat by energization in the electric heating at a second time occurring after the first time and while the indoor fan continues to operate without having stopped since the first time.