| 摘要 |
PROBLEM TO BE SOLVED: To prolong the time to an abnormal stop as long as possible by distinguishing a refrigerant deficiency state from an operating state in which an atmospheric temperature is low and deciding it. SOLUTION: The air conditioner has a refrigerant circuit A having a compressor 1, a condenser 2, an expansion valve 3 and an evaporator 4 attached with an indoor fan 6 sequentially connected. The air conditioner comprises a deciding means for deciding a refrigerant deficiency state in which a refrigerant amount in the circuit A is insufficient, when the valve 3 is fully opened and a pressure difference between high and low pressures in the circuit A becomes a predetermined value or more; and a control means for controlling to lower the discharge temperature of the compressor 1 when the refrigerant deficiency state is decided by the deciding means to fully open the valve 3, and to control to lower the discharge temperature of the compressor 1 when it is decided that the valve 3 is fully opened and the pressure difference between the high and low pressures becomes the value or more (that is, the deficiency state is decided). The control to lower the discharge temperature of the compressor 1 is executed, thereby suppressing the rise of the temperature generated due to the deficiency operation. |
