METHOD FOR AVOIDING REFRIGERANT NOISE OF INDOOR UNIT OF MULTI-AIR CONDITIONER FOR OFFSETTING REFRIGERANT FLOW NOISE OF PIPES INSIDE BY NOISE OF INDOOR FAN

摘要

PURPOSE: A method for avoiding a refrigerant noise of an indoor unit of a multi-air conditioner is provided to offset a refrigerant flow noise due to a differential pressure of a pipe inside by a noise according to rotation speed of an indoor fan by opening an electronic expansion valve with operating the indoor fan at the same time or after a few seconds. CONSTITUTION: If a cooling operation or heating operation is selected by a user, a louver of an indoor unit is opened and an indoor fan is driven after predetermined time(SP21-SP25). If predetermined time passes after driving the indoor fan, an electronic expansion valve is opened(SP26,SP27). A compressor of an outdoor unit is operated to execute the cooling operation or heating operation(SP28).