CLEANING METHOD OF REFRIGERANT PIPE, RENEWING METHOD OF AIR CONDITIONER AND AIR CONDITIONER

摘要

PROBLEM TO BE SOLVED: To reduce the quantity of refrigerant to be used; and to shorten time of cleaning operation when changing an operating refrigerant to an HFC type refrigerant while diverting refrigerant pipes of an air conditioner using refrigerating machine oil of a mineral oil system. SOLUTION: The remaining refrigerating machine oil is removed by cleaning the inside of the refrigerant pipes 6 and 7 by using the HFC type refrigerant including R32 by 40 wt.% or more as a cleaning agent when changing the operating refrigerant to an operating refrigerant composed of the HFC type refrigerant while diverting the refrigerant pipes 6 and 7 of the air conditioner 1 using the refrigerating machine oil of the mineral oil system. COPYRIGHT: (C)2004,JPO&NCIPI