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Title:
AIR CONDITIONER AND CONTROL METHOD
Document Type and Number:
WIPO Patent Application WO/2020/059079
Kind Code:
A1
Abstract:
An air conditioner according to an embodiment of the present invention has one or more indoor units, one or more outdoor units, an oil level drop detection unit, and a control unit. The indoor units each have an indoor heat exchanger and an indoor expansion valve. The outdoor units each have an outdoor heat exchanger, an outdoor expansion valve, a four-way valve, and a compressor. The oil level drop detection unit detects whether a drop in the oil level of a refrigeration oil has occurred in the compressors while the indoor units and the outdoor units are performing a heating operation. The control unit switches the four-way valve into the state thereof during a cooling operation when the oil level drop detection unit detects the occurrence of an oil level drop in the compressors.

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JPH09257321FREEZER DEVICE
Inventors:
IMATO NAOKI (JP)
MIURA KEN (JP)
PHAKSANG ATHIDEJ (JP)
Application Number:
PCT/JP2018/034823
Publication Date:
March 26, 2020
Filing Date:
September 20, 2018
Export Citation:
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Assignee:
TOSHIBA CARRIER CORP (JP)
International Classes:
F25B1/00; F24F11/30; F25B13/00; F24F140/00
Domestic Patent References:
WO2013099047A12013-07-04
Foreign References:
JP2018004106A2018-01-11
JP2009150368A2009-07-09
JPH10132406A1998-05-22
JPH08200851A1996-08-06
Attorney, Agent or Firm:
SHIGA INTERNATIONAL PATENT OFFICE (JP)
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