| 摘要 |
PURPOSE: A control method of refrigerant-return for multiple air-conditioner is provided to improve return of refrigerant and oil and performance of a cycle. CONSTITUTION: A method includes the steps of: a step A which is adjusting opening of an expansion valve connected with an operated unit of indoor units by pulse value calculated by load of the indoor units and an outdoor unit to circulate refrigerant; and a step B successively opening and closing an expansion valve connected with an inoperative unit of the indoor units as time passes to circulate refrigerant.
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