| 摘要 |
PURPOSE:To connect two or more indoor units to to a heat source apparatus and allow them to individually, selectively perform either heating or cooling operation at the same time by a method wherein a relay apparatus includes a first manifold, a second flow control valve, a fourth flow control valve and a second manifold and is located between the heat source apparatus and the two or more indoor units, and a first connecting pipe is larger in diameter than a second connecting pipe so that the first connecting pipe is allowed to be switched over to the low pressure side and the second connecting pipe to the high pressure side. CONSTITUTION:A first manifold 10 and a second manifold 11 are connected to each other via a second flow control valve 13, and the second manifold 11 and a first connecting pipe 6 are connected to each other via a fourth flow control valve 17. A relay apparatus E includes the first manifold 10, the second flow control valve 13, the fourth flow control valve 17 and the second manifold 11 and is located between a heat source apparatus A and two or more indoor units B, C and D. First branch pipes 6b, 6c and 6d are larger in diameter than the second connecting pipe 7, and changeover valves 8 are provided between the first and second connecting pipes 6 and 7 of the heat source apparatus A, so that the first connecting pipes 6 allowed to be changed over to the high pressure side and the second connecting pipes 7 to the low pressure side. |
