PURPOSE: To obtain a comfortable air conditioning effect by a method wherein a required heating capacity is calculated from the room temperature difference and the floor temperature difference between the floor temperature and the preset floor temperature, and the rotating frequency of a variable capacity compressor is determined in accordance with the calculated result.
CONSTITUTION: A room temperature sensor 16 is provided on a room heat exchanger to detect the room temperature, and a floor temperature sensor 17 is attached on a floor heating panel 10 to detect the floor temperature. Information of the room temperature signal detected by the room temperature sensor 16 and the floor temperature signal detected by the floor temperature signal are input to a control circuit 20 which controls an inverter circuit 2 of a compressor 3 and a fan motor 22 that controls the rotating speed of a room fan 5. That is, whatever situation the room temperature and the floor temperature are in against the set temperatures, frequency control of the compressor is performed by calculating the required heating capacity from the room temperature difference and the floor temperature difference, so that the room temperature and the floor temperature are controlled to the set temperatures.
YAMAGISHI KATSUAKI
TANAKA TOSHIMASA
