PURPOSE: To improve operational and functional performance by driving a common outdoor unit in a higher-ranking operational mode in accordance with a predetermined priority order in meeting the demand for different operational modes of indoor units and by prohibiting the operation of indoor units in the lower-ranking mode.
CONSTITUTION: From control circuits for indoor units 1a and 1b having CPU6 respectively, driving signals are given to a compressor-motor 3 of a common outdoor unit and relays 5a and 5b for starting a four-way change-over valve 4 to change the flow route of refrigerant, respectively, and at the same time driving-state signals for a motor 3 and the valve 4 are inputted in each control circuit therefor. When instructions for operation in different operational modes are given from both indoor units, an indoor unit 2 is driven in the higher-ranking mode in accordance with the predetermined priority order. At this time, the operation of the indoor unit instructing the operational mode in the lower-ranking order is stopped and the indication that the mode instructed is different from the operational mode is displayed on the operational panel of the unit.
FUJITANI MASARU
HATA KATSUHIKO
TANAKA SHIGETAKA
