AIR CONDITIONER

WIPO Patent Application WO/2021/053821

A1

This air conditioner comprises: a four-way valve having first to fourth ports; a first three-way valve and a second three-way valve each having fifth to seventh ports and a closed eighth port; a compressor; an indoor heat exchanger; an expansion valve; a first outdoor heat exchanger, a second outdoor heat exchanger; a bypass expansion valve; a check valve; a discharge temperature sensor for detecting the discharge temperature of the compressor; an indoor pipe temperature sensor for detecting the pipe temperature of the indoor heat exchanger; an indoor temperature sensor for detecting the indoor temperature of the indoor air; an electric current sensor for detecting an electric current value supplied to the compressor; and a control device for detecting switching defects of the four-way valve, the first three-way valve, and the second three-way valve, the air conditioner being configured so as to allow a heating operation, a defrosting operation, a cooling operation, and a simultaneous heating and defrosting operation to be performed. The control device detects the switching defects of the four-way valve or the first three-way valve and the second three-way valve on the basis of: the temperatures respectively detected by the discharge temperature sensor, the indoor pipe temperature sensor, and the indoor temperature sensor; the electric current value; and the operating states.

TADA YOSHIYUKI (JP)
KONDO MASAKAZU (JP)
SATO MASAKAZU (JP)

PCT/JP2019/037054

March 25, 2021

September 20, 2019

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MITSUBISHI ELECTRIC CORP (JP)

F25B47/02; F25B49/02

WO2019146139A1

2019-08-01

JP2014077578A	2014-05-01
JP2010107058A	2010-05-13

KISA PATENT & TRADEMARK FIRM (JP)

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