| 摘要 |
PROBLEM TO BE SOLVED: To provide an air conditioner capable of performing stable defrosting operation without causing problems of deterioration in comfortableness or defrosting omission while improving the reliability of a compressor by suppressing a low pressure rise during defrosting and further while continuing heating operation. SOLUTION: The air conditioner comprises a first bypass circuit 6 connecting a part between an indoor heat exchanger 3 to a decompressor of a heat pump type refrigeration cycle to the suction side of the compressor 1, the first bypass circuit 6 including a two-way valve 7 and a refrigerant heater 9; and a second bypass circuit 13 connecting a part between a four-way valve 3 connected to the refrigeration cycle and the indoor heat exchanger 3 to a part between the decompressor 4 and an outdoor heat exchanger 5, the second bypass circuit 13 including a two-way valve 14 in which when the outdoor heat exchanger 5 is defrosted, the two-way valve 7 of the first bypass circuit 6 is opened and the two-way valve 14 of the second bypass circuit 13 is opened to perform the defrosting operation. In this air conditioner, a control condition for turning on or off the refrigerant heater is provided in the defrosting section. COPYRIGHT: (C)2008,JPO&INPIT |
