AIR-CONDITIONING APPARATUS
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United States of America Patent
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Jul 8, 2015
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Jul 8, 2015
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Abstract
An air-conditioning apparatus includes: a refrigerant circuit including a compressor, an indoor heat exchanger, an expansion valve, and an outdoor heat exchanger that are connected by a refrigerant pipe so that refrigerant circulates through the refrigerant circuit; and a controller configured to control an operation state of the compressor, in which the controller is configured to estimate an oil concentration inside the compressor based on a temperature of gas refrigerant discharged from the compressor and a pressure of the gas refrigerant discharged from the compressor, and when the oil concentration is less than an oil concentration reference value, continue an operation of the compressor even under a state in which the thermo-off condition is satisfied.
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