| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an air conditioner capable of preventing degradation of heating capacity in a defrosting operation, in particular when a temperature of the outside air is low, and keeping a comfortable indoor environment. <P>SOLUTION: This air conditioner 100 comprises a main circuit constituted by successively connecting a compressor 11 having an injection port, a four-way valve 12, a load-side heat exchanger 51, a load-side throttling device 52, a refrigerant heat exchanger 17, a heat source-side restriction device 16, and divided heat exchangers 14a-14c constituting a heat source-side heat exchanger 14 by refrigerant pipes, an injection circuit constituted by successively connecting a restriction device 18 for bypass, the refrigerant heat exchanger 17 and an injection port of the compressor 11 by an injection pipe 4 obtained by branching the refrigerant pipe connecting the refrigerant heat exchanger 17 and the load-side restriction device 52, and a defrost circuit constituted by connecting the branching pipes 3 obtained by branching the refrigerant pipe connecting the compressor 11 and the four-way valve 12, to the divided heat exchangers 14a-14c. <P>COPYRIGHT: (C)2009,JPO&INPIT |
