Air conditioner

Abstract

Abstract PURPOSE: To start smoothly a second compressor by a method wherein when each of compressors is changed over from its single operation to dual operations, the other compressor is started in a state in which the operating frequency of the compressor already operated is decreased. CONSTITUTION: A multi-control section 60 of a branch device B outputs a discriminating signal to an outdoor control section 50 of an outdoor device A when the multi-control section discriminates that the capacity of each of the indoor devices C to E is changed from its single compressor operation to operations of dual compressors. Then, the outdoor control section 50 decreases an output frequency from an inverter circuit 51 to a compressor motor 1M down to a predetermined value, outputs the same frequency value as that of the predetermined one to a compression motor 2M from the other inverter circuit 52 in a state in which a discharged refrigerant pressure of the compressor is being decreased so as to start it and subsequently it gradually increases output frequencies from both inverters 51, 52 and further increases a rotational driving of both compressors up to a required capacity. In this way, it is possible to start smoothly the second compressor.

Inventors

• 👤 Manabu Kitamoto

Bibliographic Details