Air conditioning apparatus
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United States of America Patent
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Jul 18, 2017
Grant Date -
Sep 22, 2016
app pub date -
Sep 10, 2014
filing date -
Oct 29, 2013
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An air conditioning apparatus includes a refrigerant circuit performing an air-warming operation by circulating refrigerant through the compressor, indoor heat exchanger, expansion valve, and outdoor heat exchanger in order. The outdoor heat exchanger has flat perforated tubes arrayed vertically in multiple levels. The heat transfer tubes are sectioned into main and subordinate heat exchange parts. Upper and lower exit-entry spaces are formed in the outdoor heat exchanger. When an oil-accumulation-resolving criterion is met during the air-warming operation, low-refrigerant-circulation control, in which the refrigerant is circulated through the compressor, indoor heat exchanger, expansion valve, and outdoor heat exchanger in order, is performed for a predetermined time with an operating capacity of the compressor having been lowered to a predetermined capacity. The oil-accumulation resolving criterion is used to initiate an operation of defrosting the outdoor heat exchanger after the low-refrigerant-circulation control is performed.
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Family
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