PURPOSE: To prevent the delivery temperature from rising excessively during cooling and heating operation, and offer a multiple-room type air-conditioner capable of performing high-reliable system operation without such troubles as burning of a compressor motor, burning of bearings, and others.
CONSTITUTION: An outdoor controller 21 for controlling the delivery temperature detects the delivery temperature through a delivery temperature detector 8, obtains temperature differences through a delivery temperature comparator 22, and makes an inverter frequency controller 23 control the frequency of an inverter 2 or a high-pressure liquid valve on-off device 24 open or close a high-pressure liquid bypass valve 18 corresponding to the temperature differences.
KITAYAMA HIROSHI
KINO AKIHIRO
NAKAGAWA NOBUHIRO
FUJIMOTO RYUZO
