COLD AND WARM-FREE EXTRACTION TYPE HEAT PUMP TYPE AIR-CONDITIONER

摘要

PURPOSE:To enable proper air-conditioning in response to seasonal change of air-conditioning environment by installing a warming/cooling coil for two sets of air-conditioning circuits in a large number of indoor units and connecting each compressor to one driving means through a power transmitting mechanism capable of freely changing power transmission rates respectively. CONSTITUTION:In the summer period, the electric control valve 7A of a first air-conditioning circuit 1 is brought to a closed state and electric control valves 7B,..., 7N are brought to an open state, and the electric control valve 7A of a second air-conditioning circuit 21 is brought to the open state and the electric control valves 7B,..., 7N are brought to the closed state. Air-conditioning combining coils 6B,..., 6N for the first air-conditioning circuit 1 in an indoor unit 3N are used as evaporators, and the first air-conditioning circuit 1 is employed for cooling. The first compressor 14 of the first air-conditioning circuit 1 is set in capacity at the time of peak cooling load by operating a first power transmitting mechanism 15 at the same time. On the other hand, a warming/cooling coil 26A for a second air-conditioning circuit 21 in another indoor unit 3A is employed as a condenser and the air-conditioning circuit is used for heating while a second power transmitting mechanism 35 is operated and the second compressor 34 of the second air-conditioning circuit 21 is set in capacity at the time of low load.