Air conditioner
AssigneeHitachi, Ltd.
InventorsHiroshi Takenaka, Hirokiyo Terada, Minetoshi Izushi, Kensaku Oguni, Makoto Nagai, Shunji Sasaki, Yasuji Sakuma, Kenji Tokusa
Life of this patent
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Abstract
An air conditioner comprises a first unit including a compressor and a heat exchanger, a second unit including a heat exchanger, a refrigerant circuit connecting the compressor and the heat exchanger of the first unit, with the heat exchanger of the second unit, through which a refrigerant flows, a refrigerant pressure reduction valve disposed in the refrigerant circuit and provided in the second unit, a control unit provided in the first unit for controlling the refrigerant pressure reduction valve in the second unit.
Claims6
An air conditioner comprising:
- a first unit including a compressor and a heat exchanger;
- at least one second unit, each second unit including a heat exchanger and temperature sensors;
- a refrigerant circuit, connecting the compressor and the heat exchanger of the first unit with the heat exchanger of each second unit, through which a refrigerant flows;
- a refrigerant pressure reduction means disposed in the refrigerant circuit and provided in each second unit;
- and
- a control unit, provided in the first unit, for controlling the refrigerant pressure reduction means in each second unit, to which control unit temperature data from the temperature sensors in the at least one second unit are inputted;
- and wherein
- the control unit in the first unit calculates a controlled variable of the refrigerant pressure reduction means of each second unit in response to the inputted temperature data and outputs a pulse train to the refrigerant pressure reduction means in each second unit to directly control the refrigerant pressure reduction means to open to a desired opening degree thereof corresponding to the calculated controlled variable.
Dependencies are inferred from the claim text.