| 摘要 |
PROBLEM TO BE SOLVED: To eliminate unnecessary defrosting operation by accurately determining frosting even at the start of heating operation regardless of the length of a pipe. SOLUTION: This air conditioner comprises a first temperature detector 9 detecting outdoor heat exchanger temperature Tc on the inlet side of an outdoor heat exchanger 6 in heating operation; a second temperature detector 10 detecting compressor intake pipe temperature Ts; and an outside air temperature detector 11 detecting outside air temperature To. A control device 6 determines frosting when each of the difference between the outside air temperature To and the outdoor heat exchanger temperature Tc and the difference between the outside air temperature To and the compressor intake pipe temperature Ts is larger than a predetermined value to perform defrosting operation. When either one of the differences is smaller than the predetermined value, non-frosting is determined, and no defrosting operation is performed. COPYRIGHT: (C)2007,JPO&INPIT |
