Patent ID: 8844300
Filing Date: 2014-09-30
Classification: C09K,F25B

Abstract:
1. A refurbished air conditioner comprising: existing refrigerant piping that was used with an existing air conditioner being composed of an old heat source unit and an old user unit and contains residue of an existing mineral-oil-based refrigerant oil, the existing refrigerant piping being connected the old heat source unit and the old user unit, the existing refrigerant piping being reused as is when updating the air conditioner is complete; a new heat source unit and a new user unit that are connected together by the existing refrigerant piping with a replaced working refrigerant disposed therein, the new heat source unit and the new user unit replacing the old heat source unit and the old user unit when updating the air conditioner is complete; and an oil collecting device that is configured such that after the existing refrigerant oil has been changed and before the refurbished air conditioner is run in a normal operating mode, the oil collecting device can draw in the replaced working refrigerant that is being circulated through the air conditioner and separate the existing refrigerant oil that is carried with the replaced working refrigerant, the oil collecting device being disposed in the new heat source unit, the oil collecting device includes an oil collecting container, an inlet pipe, an inlet valve, and an outlet pipe therein, the replaced working refrigerant being an HFC refrigerant containing at least 40 wt % of R32 that serves as a cleaning agent but contains no R134a refrigerant.