| 摘要 |
PURPOSE:To increase the capacity control range by providing two outdoor heat exchangers, and using one of the exchangers as an evaporator at the time of cooling or as a condenser at the time of heating when air conditioning load is a set value or less. CONSTITUTION:At the time of heating with high load, refrigerant fed from a compressor 2 is fed through a four-way valve 5, an indoor heat exchanger gas line 4, indoor units 12, a receiver tank 9, a main outdoor heat exchanger line 3 and a suboutdoor heat exchanger line 3a, a main outdoor heat exchanger 6a and a sub outdoor heat exchanger 6b, a bypass line 15 and the valve 5 to the compressor 2, the exchangers 6a, 6b are used as evaporators to maintain a heating capacity large. On the other hand, at the time of heating with low load, the refrigerant fed to the line 4 is branched to the unit 12 side and the line 15 side as it is, the exchanger 6b is used as the condenser, thereby reducing the heating capacity. |
