Air conditioner having defrosting operation
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United States of America Patent
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Jul 17, 2018
Grant Date -
Sep 8, 2016
app pub date -
Mar 3, 2016
filing date -
Mar 4, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
CPU of an air conditioner reads out a heat exchanger outlet temperature stored in time series into a memory part to check whether the current heat exchanger outlet temperature is a second threshold temperature or lower or not, whether the drop rate of the heat exchanger outlet temperature calculated using the latest heat exchanger outlet temperature and the second-to-the-latest heat exchanger outlet temperature is a specific drop rate or higher or not, and whether the number of indoor units in operation of indoor units has increased or not during calculation of the drop rate of the heat exchanger outlet temperature. And, when the second frost forming condition is satisfied, CPU switches a four-way valve to set a refrigerant circuit into a cooling cycle to thereby execute a defrosting operation preparation processing and, on completing the defrosting operation preparation processing, resumes a compressor to start a defrosting operation.
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