AIR CONDITIONER

PURPOSE:To simplify the operation at the time of interruption and restart of air supply and discharge for the parts of spaces intended for air conditioning and also prevent the pollution in the said spaces and reduce the load of the air conditioning by linking up operation parts for selecting air supply and discharge with shut-off valves and an opening and closing valve. CONSTITUTION:Operation parts 23 for selecting air supply and discharge stopping air supply and discharge for the parts of spaces 1a-1c intended for air conditioning, which are connected to an air conditioner 2 and an air discharge fan 5 in parallel, is linked up with the shut-off valves 20, 21 placed at respective air supply and discharge sides and an opening and closing valve 32 placed at a circulating passage 29 returning a part of the air discharged from an air discharge passage 6 to the conditioner 2 by a linking mechanism. At this mechanism, an operating means 24 closing and opening the valves 20 at the air supply side and the valves 21 at the air discharge side for the spaces intended for air conditioning for which the air supply and discharge are to be stopped on the information from the part 23, and operating means 33, 34 closing fully the valve 32 before the valves 20, 21 are opened and then opening the valve 32 from fully closed condition after the lapse of a set time, are installed.