| 摘要 |
PURPOSE:To avoid a complicate, troublesome work such as dismounting of a compressor without using an expensive equipment by separating and recovering a lubricating oil (a) for CFC and/or HCFC outside a system using a difference in solubility into HFC between the lubricating oil (a) and a lubricating oil (b) for HFC. CONSTITUTION:HFC and a lubricating oil (b) dissolved into HFC move while they contain a lubricating oil (a) for CFC and/or HCFC with the elapsed time period of operation. When a valve 1 is opened once and then closed after the turbid solution-like matter consisting of HFC, the lubricating oil (a) and the lubricating oil (b) is transferred into a separating pipe, the solution-like matter can be separated into two layers; a bottom layer containing line HFC and the lubricating oil dissolved in the HFC and a top layer containing the lubricating oil (a). A valve 3 is opened and the bottom layer containing the HFC and the lubricating oil (b) dissolved in the HFC is charged into a compressor through a low-pressure side service port as it is in a gas-liquid mixed state. Then, the valve 3 is closed and a drain valve 2 is opened to recover the lubricating oil (a). |
