| 摘要 |
PURPOSE:To allow the cooling or heating operation to be freely selected at individual rooms by forming a refrigerant-piping line composed of three pipes, one being a high pressure-gas pipe, another being a low pressure-gas pipe, and the other being a liquid pipe, for connecting a heat-source unit or a mechanical unit forming a separate body to a plurality of user side units. CONSTITUTION:An interunit piping line 17 connecting a heat-source unit 1, user side units 6a, 6b, 6c, an air-suction unit 9a, and an air-discharge unit 9b is composed of a high pressure-gas pipe 18 which is connected with a refrigerant discharge pipe 14 in the manner of branching off therefrom, a low pressure-gas pipe 19 which is connected with a refrigerant suction pipe 15 in the manner of branching off therefrom, and a liquid pipe 20 which is connected with a heat-source side heat exchanger 3. Each of user side heat exchangers 7a, 7b, 7c and each of auxiliary heat exchangers 10a, 10b are connected to the high pressure-gas pipe 18 and the low pressure-gas pipe 19 by branching off and through directional control valves 21a, 22a, 21b, 22b, 22c, 23a, 24a, 23b, 24b, and to the liquid pipe 20 through refrigerant pressure-reducing devices such as a motor-operated expansion valve, 25a, 25b, 25c, 26a, 26b. |
