Patent ID: 8215121

Claim:
A refrigerant quantity determining system of an air conditioner including a refrigerant circuit configured by the interconnection between a heat source unit and a plurality of utilization units via refrigerant communication pipes, the refrigerant quantity determining system configured to determine the adequacy of the refrigerant quantity, the refrigerant quantity determining system comprising: a state quantity storing means configured to store a reference value corresponding to an operation state quantity of refrigerant present in at least one of constituent equipment and refrigerant flowing in the refrigerant circuit in which refrigerant is charged up to an initial refrigerant quantity by on-site refrigerant charging during a test operation after installation of the air conditioner on site, the state quantity storing means being further configured and arranged without the reference value stored thereon prior to installation on site, and to store the operation state quantity of refrigerant after charging the initial refrigerant quantity to obtain the reference value, and a refrigerant quantity determining means configured to compare the reference value with a current value of operation state quantity of refrigerant present in at least one of constituent equipment and refrigerant flowing in the refrigerant circuit and thereby determine the adequacy of the refrigerant quantity.