Gree Electric Appliances, Inc. of Zhuhai

Hexin Liu

Qunbo Liu

Peigang Song

Chun Huang

Zebin Chen

An oil return method for multi-split air conditioner in heating comprises steps of: S, adjusting operation frequency fof a compressor () to a first preset oil return frequency f, and simultaneously, adjusting open degree Sof each indoor throttling element () to a preset oil return open degree; S, measuring operation parameters of the air conditioner; S, judging whether the air conditioner operates abnormally, jumping to Step Sif so, or jumping to Step Sif not; S, exiting from oil return process, adjusting the operation frequency fof the compressor () to a second preset oil return frequency f, judging whether the air conditioner operates abnormally, existing from the oil return process if so, or jumping to Step Sif not; S, ending the oil return process when oil return time reaches the oil return time t

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Zhuhai, China

Hexin Liu